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Sample records for determinacao da dose

  1. Committed effective dose determination in cereal flours by gamma-ray spectrometry; Determinacao das doses efetivas por ingestao de farinhas de cereais atraves da espectrometria de raios gama

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    Scheibel, Viviane

    2006-07-01

    The health impact from radionuclides ingestion of foodstuffs was evaluated by the committed effective doses determined in commercial samples of South-Brazilian cereal flours (soy, wheat, corn, manioc, rye, oat, barley and rice flour). The radioactivity traces of {sup 228}Th, {sup 228}Ra, {sup 226}Ra, {sup 40}K, {sup 7}Be and {sup 137}Cs were measured by gamma-ray spectrometry employing a 66% relative efficiency HPGe detector. The energy resolution for the 1332.46 keV line of {sup 60}Co was 2.03 keV. The committed effective doses were calculated with the activities analyzed in the present flour samples, the foodstuff rates of consumption (Brazilian Institute of Geography and Statistics) and the ingestion dose coefficients (International Commission of Radiological Protection). The reliability median activities were verified with {chi}{sup 2} tests, assuring the fittings quality. The highest concentration levels of {sup 228}Th and {sup 40}K were 3.5 {+-} 0.4 and 1469 {+-} 17 Bq.kg{sup -1} for soy flour, respectively, with 95% of confidence level. The lower limit of detection for {sup 137}Cs ranged from 0.04 to 0.4 Bq.kg{sup -1}. The highest committed effective dose was 0.36 {mu}Sv.y{sup -1} for {sup 228}Ra in manioc flour (adults). All committed effective doses determined at the present work were lower than the UNSCEAR limits of 140 {mu}Sv.y{sup -1} and much lower than the ICRP (1991) limits of 1 mSv.y{sup -1}, for general public. There are few literature references for natural and artificial radionuclides in foodstuffs and mainly for committed effective doses. This work brings the barley flour data, which is not present at the literature and {sup 7}Be data which is not encountered in foodstuffs at the literature, besides all the other flours data information about activities and committed effective doses. (author)

  2. Uncertainty analysis in the determination of absorbed dose in water by Fricke chemical dosimetry; Analise das incertezas na determinacao da dose absorvida na agua por dosimetria quimica Fricke

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    Vasconcelos, Fabia; Aguirre, Eder Aguirre, E-mail: fabiavasco@hotmail.com, E-mail: ederuni01@gmail.com [Fundacao do Cancer, Rio de Janeiro, RJ (Brazil); Universidade do Estado do Rio de Janeiro (UERJ), RJ (Brazil)

    2016-07-01

    This work studies the calculations of uncertainties and the level of confidence that involves the process for obtaining the dose absorbed in water using the method of Fricke dosimetry, developed at Laboratorio de Ciencias Radiologicas (LCR). Measurements of absorbance of samples Fricke, irradiated and non-irradiated is going to use in order to calculate the respective sensitivity coefficients, along with the expressions of the calculation of Fricke dose and the absorbed dose in water. Those expressions are used for calculating the others sensitivity coefficients from the input variable. It is going to use the combined uncertainty and the expanded uncertainty, with a level of confidence of 95.45%, in order to report the uncertainties of the measurement. (author)

  3. Biological effects in lymphocytes irradiated with {sup 99m}Tc: determination of the curve dose-response; Efeitos biologicos em linfocitos irradiados com {sup 99m}Tc: determinacao da curva dose-resposta

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    Oliveira, Romero Marcilio Barros Matias de

    2002-08-01

    Biological dosimetry estimates the absorbed dose taking into account changes in biological parameters. The most used biological indicator of an exposition to ionizing radiation is the quantification of chromosomal aberrations of lymphocytes from irradiated individuals. The curves of dose versus induced biological effects, obtained through bionalyses, are used in used in retrospective evaluations of the dose, mainly in the case of accidents. In this research, a simple model for electrons and photons transports was idealized to simulate the irradiation of lymphocytes with {sup 99m} Tc, representing a system used for irradiation of blood cells. The objective of the work was to establish a curve of dose versus frequencies of chromosomal aberrations in lymphocytes of human blood. For the irradiation of blood samples micro spheres of human serum of albumin (HSAM) market with {sup 99m} Tc were used, allowing the irradiation of blood with different administered activities of {sup 99m} Tc, making possible the study the cytogenetical effects as a function of such activities. The conditions of irradiation in vivo using HSAM spheres marked with {sup 99m} Tc were simulated with MCNP 4C (Monte Carlo N-Particle) code to obtain the dose-response curve. Soft tissue composition was employed to simulate blood tissue and the analyses of the curve of dose versus biological effect showed a linear quadratic response of the unstable chromosomal aberrations. As a result, the response of dose versus chromosomal aberrations of blood irradiation with {sup 99m} Tc was best fitted by the curve Y=(8,99 {+-}2,06) x 1-{sup -4} + (1,24 {+-}0,62) x 10{sup -2} D + (5,67 {+-} 0,64) x 10{sup -2} D{sup 2}. (author)

  4. Applicability of a prototype for determination of absorbed dose using brachytherapy equipment with Ir-192 sources; Aplicabilidade de um prototipo para determinacao da dose absorvida utilizando equipamentos de braquiterapia com fontes de IR-192

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    Souza, Vivianne Lucia Bormann; Almeida, Mayara Gabriella Oliveira de; Vieira, Rafaela Etelvina de Amorim; Silva, Waldecy Ananias da; Nascimento, Rizia Keila, E-mail: vlsouza@cnen.gov.br, E-mail: mayaradqf@hotmail.com, E-mail: rodriguesss@hootmail.com, E-mail: waldecy@cnen.gov.br, E-mail: riziakeila@hotmail.com [Centro Regional de Ciencias Nucleares do Nordeste (CRCN-NE/CNEN-PE), Recife, PE (Brazil)

    2014-07-01

    This work aims at the development and improvement of a device to perform the absolute dosimetry sources of Ir-192 using the Fricke solution contained in a flask. The Fricke solution used was prepared using amounts of ferrous ammonium sulfate, sodium chloride and sulfuric acid, diluted with water tri distilled pre-established in the literature. The spectrophotometer used was a UV-VIS spectrophotometer (Beckman DU-640 Counter) for measuring the optical density at wavelength 304 nm. The calculation for determining the radial dose takes into account the radial distance and the angle formed with the transverse axis of the source. As the results obtained can be seen that the states of Pernambuco, Ceara, Paraiba e Piaui are in accordance with the recommendations of international standards of the International Atomic Energy Agency (IAEA), which considers not acceptable a difference greater than 5% of prescribed dose and measured dose.

  5. Determination of gamma radiation dose for destruction of Salmonella spp. in chicken flesh.; Determinacao da dose de radiacao gama para a destruicao de Salmonella spp. em carne de frango

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    Santos, Andreia Ferreira dos

    1997-07-01

    The aim of this study was to determinate: 1) the radio sensibility of Salmonella typhimurium ATCC 14028 in soy trypticase broth; 2) the radio sensibility of Salmonella typhimurium ATCC 14028 in chicken thigh and; 3) to recommend a radiation dose which can be non hazardous for human consumption

  6. Determination of the equivalent doses due to the ingestion of radionuclides from the uranium and thorium series presents in drinking waters of the region of Santa Luzia, Paraiba state, Brazil; Determinacao das doses equivalentes devido a ingestao de radionuclideos das series do uranio e torio presentes em aguas de consumo do municipio de Santa Luzia, estado da Paraiba

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    Pastura, Valeria F. da S., E-mail: vpastura@cnen.gov.b [Comissao Nacional de Energia Nuclear (DRSN/CNEN), Rio de Janeiro, RJ (Brazil). Diretoria de Radioprotecao e Seguranca Nuclear. Coordenacao de Materias Primas e Minerais; Campos, Thomas F. da C.; Petta, Reinaldo A., E-mail: thomascampos@geologia.ufrn.b, E-mail: petta@geologia.ufrn.b [Universidade Federal do Rio Grande do Norte (LARANA/UFRN), Natal, RN (Brazil). Lab. de Radioatividade Natural

    2011-10-26

    This paper determined the original dose equivalents from radionuclides of uranium and thorium series in a drinking water of well which is supplied to the population of Santa Luzia, Paraiba state, Brazil. The collected waters are near to the mineralized phlegmatic bodies in rose quartz and amazonite feldspar. Radiometric measurements performed on the feldspar vein point out counting ratios surrounding 30000 cps and the analysis of collected samples of minerals presented tenors for the {sup 226}Ra and {sup 219}Pb varying from 0.50 to 2.30 Bq/sw. For determination of concentration of radionuclides U{sub Total}, {sup 226}Ra, {sup 228}Ra and {sup 219}Pb, found in the not desalinated, two methods were used, spectrophotometry with arsenazo and radiochemistry, both realized in the CNEN-LAPOC laboratories. For the calculation of dose equivalent it was taken into consideration the following parameters: the dose coefficients for incorporation by ingestion for public individuals with ages over 17 years (Norma CNEN-NN-3.01, Regulatory Position 3.01/011) and daily ingestion of 4 liters of water, which is over the recommended by the WHO of 2L/day - 1993. The obtained values were compared with the reference value for compromised dose equivalent established by WHO for evaluate the risk potential to the health of population, by ingestion. The radionuclide concentrations in the wells varies from 0.054 to 0.21 Bq/L, resulting dose equivalents of 3.94 x 10{sup -3} mSv/year and 0.17 mSv/year in the studied population

  7. Determination of the dose of gamma radiation sterilization for assessment of biological parameters of male Ceratitis capitada (Diptera: Tephritidae), tsl - Vienna 8 strain; Determinacao da dose de radiacao gama esterilizante pela avaliacao dos parametros biologicos de machos de Ceratitis capitata (Diptera: Tephritidae), linhagem tsl - Vienna 8

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    Rocha, Aline Cristina Pereira da

    2011-07-01

    The Vienna-8, tsl (temperature sensitive lethal) strain of Ceratitis capitata, by presenting mutations that facilitate the mass rearing and release only of sterile males in the field, has been used in (Sterile Insect Technique) programmes. The objective of this study was to determine the radiation dose that provides the highest level of sterility for Vienna-8, tsl males assessing their biological parameters that indicate the quality of sterile males to be released. Brown pupae (males) of the tsl strain were obtained from the mass rearing of the Food Irradiation and Radio entomology laboratory of CENA/USP, and they were irradiated (with gamma radiation - {sup 60}Co) 24 hours before the emergence at rates of 0, 30, 60, 90 and 120 Gy. The determination of the sterilizing dose was based on fertility of sexually mature females of the bisexual strain and not irradiated, mated with males of different treatments. Eggs were collected daily during 6 days, were counted and it was possible to estimate fecundity, and assess the hatching rate. The emergence and flight ability were determined by following the protocol of quality control manual for FAO/IAEA/USDA (2003). To assess the longevity under nutritional stress, the insects were kept a period of 48 h after emergence in the absence of water and food, and after this period, mortality was recorded. The size of the testes (left and right) was obtained by dissecting irradiated and non-irradiated males at the eighth day of life, and measure the testes in an ocular micrometer, considering the maximum length and width of each sample. To determine the sperm number was necessary to dissect the males and break their testicles. No difference was observed in emergence rate, flight ability and longevity of irradiated and non-irradiated males, nor in the fecundity of females mated with males of different treatments. The sterilizing dose that resulted in lower fertility of females was 120 Gy, with 1.5% hatching. Considering the parameters

  8. Determination of {sup 210} Pb in mineral spring waters of Aguas da Prata city; Determinacao de {sup 210} Pb em aguas minerais da cidade de Aguas da Prata

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    Moreira, S R.D.

    1994-12-31

    Concentration levels of {sup 210} Pb have been analyzed in 12 mineral spring waters of Aguas da Prata city. The {sup 210} Pb concentration was determined through {sup 210} Bi, by measuring the gross beta activity of the {sup 210} Pb Cr O{sub 4} precipitate after separation from interfering elements by complexation with nitrile tri acetic acid at basic pH. The {sup 210} Bi beta activity was carried out in a low background gas flow proportional counter. Concentrations ranging from lower limit of detection to 1240 mBq/L were observed for {sup 210} Pb. The radiochemical procedure adopted presented a chemical yield around 85% and a lower limit of detection of 4,9 mBq/L. Dose calculations were performed in order to evaluate the importance of this radionuclide to the radiation exposure due to the ingestion of these waters. Based upon measured concentrations, committed effective doses up to 1,1 mSv/y and committed doses to the bone up to 1.7 x 10{sup 1} mSv/y were observed for {sup 210} Pb. (author). 64 refs, 6 figs, 7 tabs.

  9. Determination of atomic number and composition of human enamel; Determinacao da composicao e numero atomico efetivo do esmalte humano

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    Nogueira, M.S. [Centro Regional de Ciencias Nucleares (CRCN), Recife, PE (Brazil); Rodas Duran, J.E. [Sao Paulo Univ., Ribeirao Preto, SP (Brazil). Faculdade de Filosofia, Ciencias e Letras. Dept. de Fisica e Matematica

    2001-07-01

    The teeth are organs of complicated structure that consist, partly, of hard tissue containing in its interior the dental pulp, rich in vases and nerves. The main mass of the tooth is constituted by the dentine, which is covered with hard tissues and of epithelial origin called enamel. The dentine of the human teeth used in this work were completely removed and the teeth were cut with a device with a diamond disc. In this work the chemical composition of the human enamel was determined, which showed a high percentage of Ca and P, in agreement with the results found in the literature. The effective atomic number of the material and the half-value layer in the energy range of diagnostic X-ray beams were determined. Teeth could be used to evaluated the public's individual doses as well as for retrospective dosimetry what confirms the importance of their effective atomic number and composition determination. (author)

  10. Real time determination of dose radiation through artificial intelligence and virtual reality; Determinacao de dose de radiacao, em tempo real, atraves de inteligencia artificial e realidade virtual

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    Freitas, Victor Goncalves Gloria

    2009-07-01

    In the last years, a virtual environment of Argonauta research reactor, sited in the Instituto de Engenharia Nuclear (Brazil), has been developed. Such environment, called here Argonauta Virtual (AV), is a 3D model of the reactor hall, in which virtual people (avatar) can navigate. In AV, simulations of nuclear sources and doses are possible. In a recent work, a real time monitoring system (RTMS) was developed to provide (by means of Ethernet TCP/I P) the information of area detectors situated in the reactor hall. Extending the scope of AV, this work is intended to provide a continuous determination of gamma radiation dose in the reactor hall, based in several monitored parameters. To accomplish that a module based in artificial neural network (ANN) was developed. The ANN module is able to predict gamma radiation doses using as inputs: the avatar position (from virtual environment), the reactor power (from RTMS) and information of fixed area detectors (from RTMS). The ANN training data has been obtained by measurements of gamma radiation doses in a mesh of points, with previously defined positions, for different power levels. Through the use of ANN it is possible to estimate, in real time, the dose received by a person at any position in Argonauta reactor hall. Such approach allows tasks simulations and training of people inside the AV system, without exposing them to radiation effects. (author)

  11. Determination of the initial energy in computerized tomography with proton beams; Determinacao da energia inicial em tomografia computadorizada com feixe de protons

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    Rocha, Rodrigo Luis da

    2007-07-01

    In earliest works devoted to proton computed tomography it was shown that the advantage of pCT image reconstruction appears when the energy is close to the Bragg peak region, since the proton passes the object. This effect provided by the Bragg peak makes the computerized tomography with protons possible. However, when decreasing the initial proton energy, with the increase of the irradiation dose, there are two effects that work simultaneously in opposite ways. First, the energy loss of a proton in an object becomes bigger at small initial energy. At the same time decreasing of the proton energy results in the increase of the energy straggling, requiring a larger number of protons. In this work the radiation dose dependence on the proton initial energy was studied using analytical formulas and computer simulations. The investigation determined that the radiation dose practically does not depend on the initial energy, except in the energy region very close to the minimum energy necessary to pass the object. (author)

  12. Dose Vocal: uma revisão integrativa da literatura

    Directory of Open Access Journals (Sweden)

    Joana Perpétuo Assad

    Full Text Available RESUMO O objetivo da pesquisa foi realizar uma revisão da literatura referente aos tipos de dose vocal e aos resultados destas medidas em diferentes situações comunicativas. Houve levantamento da literatura nacional e internacional, publicada nos idiomas Inglês, Espanhol ou Português, utilizando-se as bases de dados MEDLINE, LILACS, IBECS e ISI (Web of Science, dos últimos 21 anos, cujos artigos estavam disponíveis na íntegra. Quinze estudos contemplaram os critérios propostos. A maioria dos artigos estudou professores, visto que são mais vulneráveis para a ocorrência de disfonia. Os tipos de dose encontrados foram porcentagem de fonação, dose temporal, dose cíclica, dose de distância, dose de energia radiada e dose de energia dissipada. O aumento da dose vocal está associado ao uso excessivo e prolongado da voz na atividade docente, principalmente entre os professores da educação infantil e os de canto. As altas doses vocais correlacionam-se também à presença de disfonia, ao maior nível de ruído ambiental, à grande variação prosódica na fala e à autopercepção de fadiga vocal. Pacientes com disfonia comportamental (nódulos e pólipos apresentam maiores doses vocais que pacientes com outros quadros disfônicos. Fatores como repouso de voz e uso do amplificador vocal indicam a diminuição da dose da voz.

  13. Utilization of ALANPOL dosemeter composed by alanine and polyethylene for determination of doses in industrial effluents; Utilizacao do dosimetro ALANPOL composto por alanina e polietileno para determinacao de doses em efluentes industriais

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    Rela, Carolina S.; Sampa, Maria Helena de O.; Napolitano, Celia M. [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)]. E-mail: csrela@ipen.br; Pontuschka, Walter M. [Sao Paulo Univ., SP (Brazil). Inst. de Fisica

    2005-07-01

    A study of traceability and accuracy was performed with the dosimetry system ALANPOL developed by IVHTJ/ Poland that uses alanine as a dosimeter and EPR as the read out system. The dosimeter ALANPOL is a polymer compound that aggregates alanine. The dosimeter has the outside diameter 3 mm, and the length of 25,4 mm (1 inch). In order to use this dosimeter for monitoring the existing real time calorimetry dosimeter system set up in a electron beam waste treatment plant. Electron beam and gamma irradiation experiments with ALANPOL was carried out under demineralized water and industrial effluent. The result show that in the dose range of 1-40 kGy the ALANPOL dosimeter system is suitable underwater monitoring for absorbed dose and can be applied for the evaluation of the on line calorimetry dosimeter system. (author)

  14. Comportamento da área foliar da videira “Isabel” submetida a diferentes tipos e doses de biofertilizantes

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    Olivânia dos Santos Nascimento

    2014-06-01

    Full Text Available Objetivou-se verificar o efeito da aplicação de diferentes tipos e doses de biofertilizante, na área foliar da videira ‘Isabel’ em cultivo orgânico nas condições edafoclimáticas de Catolé do Rocha-PB. Estudou-se os efeitos de 5 tipos de biofertilizante biofertilizante e 8 doses na área foliar da videira ‘Isabel’ após a primeira poda de produção. O experimento foi conduzido sob condições de campo, em área pertencente à Universidade Estadual da Paraíba, Campus IV. O delineamento adotado foi o de blocos casualizados, com 40 tratamentos, no esquema fatorial 5 x 8, com 4  repetições, totalizando 160 parcelas experimentais, os tratamentos consistiram em aplicações crescentes de diferentes biofertilizante, aplicados de forma independente. O valor da área foliar unitária da videira Isabel aumentou com o incremento da dose do biofertilizante B1 até um limite ótimo de 0,93 L/planta/aplicação; o valor da área foliar unitária diminuiu com o aumento da dose do biofertilizante B1 acima do limite ótimo de 0,93 L/planta/aplicação; a utilização de biofertilizante enriquecido com farinha de rocha e leguminosa (B3 proporcionou maior área foliar unitária e área foliar da planta da videira Isabel.

  15. Use of thin layer chromatography for the determination of radiochemical purity of radiopharmaceuticals in nuclear medicine services of Paraiba and Rio Grande do Norte, Brazil; Utilizacao da cromatografia em camada delgada para determinacao da pureza radioquimica de radiofarmacos em servicos de medicina nuclear da Paraiba e Rio Grande do Norte, Brasil

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    Andrade, W.G.; Santos, P.A.L.; Lima, F.R.A. [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Programa de Pos-Graduacao em Tecnologia Energetica; Lima, F.F., E-mail: wellington.gandrade@gmail.com [Centro Regional de Ciencias Nucleares do Nordeste (CRCN-NE/CNEN-PE), Recife, PE (Brazil)

    2012-07-01

    The paper chromatography and the thin layer chromatography are separation techniques in which the radioactive components migrate because of their affinity with the eluent (mobile phase) or stationary phase, respectively. In radiopharmaceuticals labeled with {sup 99m}Tc, besides its own radiopharmaceutical, {sup 99m}TcO{sup 4-} free and TcO{sub 2} can be identified and quantified. The evaluation of radiochemical purity of radiopharmaceuticals is essential to produce images free of artifacts as well as avoid unnecessary absorbed dose to the patient. Once they are managed in humans it is important and necessary that they undergo to strict quality control. Because of this, ANVISA in its 'Resolucao da Diretoria Colegiada (RDC) 38 of June 4th, 2008 states the obligation of performing a minimum of tests in nuclear medicine services routine prior to human administration. This work evaluated, by the method of thin layer chromatography (TLC), radiochemical purity, determined the pH of the radiopharmaceutical DEXTRAN- 500, DMSA, DTPA, PHYTATE, MDP, MIBI and Sn-Col used in nuclear medicine services in the states of Paraiba and Rio Grande do Norte - Brazil. The results show that the use of thin layer chromatography (TLC) as a standard method in routine of nuclear medicine services is possible, because it provides important data for the evaluation of radiochemical purity, allowing the exclusion of a radiopharmaceutical poorly marked. (author)

  16. Comportamento da área foliar da videira “Isabel” submetida a diferentes tipos e doses de biofertilizantes

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    Olivânia dos Santos Nascimento; Aldair Souza Medeiros; Atos Tavares Gomes; Fábio Itano dos Santos Alves; José Geraldo Rodrigues dos Santos

    2014-01-01

    Objetivou-se verificar o efeito da aplicação de diferentes tipos e doses de biofertilizante, na área foliar da videira ‘Isabel’ em cultivo orgânico nas condições edafoclimáticas de Catolé do Rocha-PB. Estudou-se os efeitos de 5 tipos de biofertilizante biofertilizante e 8 doses na área foliar da videira ‘Isabel’ após a primeira poda de produção. O experimento foi conduzido sob condições de campo, em área pertencente à Universidade Estadual da Paraíba, Campus IV. O delineamento adotado foi o d...

  17. Determination of radiochemistry purity and pH of radiopharmaceutical in Northeast nuclear medicine services; Determinacao da pureza radioquimica e pH de radiofarmacos em servicos de medicina nuclear do Nordeste

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    Andrade, Wellington; Santos, Poliane, E-mail: wellington.gandrade@gmail.com, E-mail: polianeangelo@gmail.com [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil); Lima, Fernando de Andrade; Lima, Fabiana Farias de, E-mail: falima@cnen.gov.br, E-mail: ffmima@cnen.gov.br [Centro Regional de Ciencias Nucleares do Nordeste (CRCN-NE/CNEN-PE), Recife, PE (Brazil)

    2013-07-01

    The radiopharmaceutical is a chemical compound associated with a radionuclide, which is selected so that meets the need cf diagnosis and capable of producing quality images. Drugs labeled with {sup 99m}Tc radionuclide kits consist of lyophilized, and be handled by the nuclear medicine services (NMS) must pass tests as the resolution of ANVISA (RDC 38) published in 2008. Among these tests are those of radiochemical purity and pH determination. This study evaluated the radiochemical purity of radiopharmaceuticals and pH SMN manipulated in the Northeast. The radiochemical purity (RCP) was determined by thin layer chromatography, which were used Whatman Registered-Sign and silica gel, with dimensions of 1 x 10 cm, as stationary phase, and solvents indicated in the inserts of manufacturers. The chromatographic strips were placed in sealed containers so as not to touch the walls thereof. After the chromatographic run, the tape was cut every centimeter and the activities determined in doses of each calibrator NMS. The pH of the radiopharmaceutical was assessed through the use of universal pH paper (Merck Registered-Sign ) and obtained staining compared with its color scale. The results showed (hat 82.6% and 100% of the radiopharmaceuticals of the samples were within the limits recommended by international pharmacopoeias for radiochemical purity and pl-l, respectively. There is then the need to include in routine tests indicated SMN by ANVISA. Well, they can detect possible problems in the marking of radiopharmaceuticals administered to the patient and avoid inappropriate material. (author)

  18. Calculation of dose equivalents for photon skyshine production; Calculo da dose equivalente para fotons decorrente da producao de skyshine

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    Frota, Marco A.; Kelecom, Alphonse [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Biologia Geral. Lab. de Radiobiologia e Radiometria (LARARA)]. E-mail: egbakel@vm.uff.br

    2005-07-01

    Some radiation facilities are designed with little shielding in the ceiling above the accelerator. A problem may then arise as a result of the radiation scattered by the atmosphere to points at ground level outside the treatment room. Stray radiation of this type is referred to as skyshine, and the National Council on Radiation Protection and Measurements Report No. 51 (NCRP 1977) gives methods for the calculation of skyshine for accelerator facilities. McGinley (1993) has compared skyshine measurements made at an 18 MeV medical accelerator facility with values calculated using the techniques presented in NCRP Report No. 51. Measurements were made of the photon levels outside a treatment room housing a Varian 2100 deg C. The roof above the accelerator was designed for weather protection only and offered little shielding for the primary beam and scattered radiation. The distance from the treatment room floor to the roof was 4.27 m, and the primary walls were constructed of concrete 2.0 m thick.The secondary walls were fabricated of concrete 0.99 m thick. The results for the photon skyshine rate dose as a function of distance from the isocenter using Monte Carlo code, are compared with those in NCRP publication 74 and measured obtained. The photon skyshine dose rates simulated for real clinic spectra transmitted through roof range from 4.7 to 14.6 nSv.s{sup -1}. (author)

  19. Determination of electron clinical spectra from percentage depth dose (PDD) curves by classical simulated annealing method; Determinacao de espectros de energia de eletrons clinicos a partir de curvas de porcentagem de dose em profundidade (PDP) utilizando o metodo de recozimento simulado classico

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    Visbal, Jorge H. Wilches; Costa, Alessandro M., E-mail: jhwilchev@usp.br [Universidade de Sao Paulo (USP), Ribeirao Preto (USP), SP (Brazil). Faculdade de Filosofia, Ciencias e Letras

    2016-07-01

    Percentage depth dose of electron beams represents an important item of data in radiation therapy treatment since it describes the dosimetric properties of these. Using an accurate transport theory, or the Monte Carlo method, has been shown obvious differences between the dose distribution of electron beams of a clinical accelerator in a water simulator object and the dose distribution of monoenergetic electrons of nominal energy of the clinical accelerator in water. In radiotherapy, the energy spectrum of electrons should be considered to improve the accuracy of dose calculation, because the electron beams that reach the surface traveling through internal structures of accelerator are not in fact monoenergetic. There are three principal approaches to obtain electron energy spectra from central PDP: Monte Carlo Method, Direct Measurement and Inverse Reconstruction. In this work, it will be presented the Simulated Annealing method as a practical, reliable and simple approach of inverse reconstruction as being an optimal alternative to other options. (author)

  20. Estimation of average glandular dose depending on the thickness of the breast; Estimativa da dose glandular media em funcao da espessura da mama

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    Real, Jessica V.; Luz, Renata M. da, E-mail: jessica.real@pucrs.br, E-mail: renata.luz@pucrs.br [Hospital Sao Lucas (HSL/PUCRS), Porto Alegre, RS (Brazil); Fröhlich, Bruna D.; Pertile, Alessandra S.; Silva, Ana Maria Marques da, E-mail: bruna.frohlich@acad.pucrs.br, E-mail: lessandra.pertile@acad.pucrs.br, E-mail: ana.marques@pucrs.br [Pontificia Universidade Catolica do Rio Grande do Sul (PUCRS), Porto Alegre, RS (Brazil)

    2014-07-01

    Breast cancer is the most common type of cancer in women worldwide. Mammography is, to date, the most efficient method for detecting an abnormality in the patient's breast. It is a technique of imaging diagnostic that requires special care because radiographs without adequate quality may lead to a false diagnosis and lead to the need for a repeat examination, increasing the dose of radiation in the patient. This study aimed to evaluate the average glandular dose (AGD), depending on the breast thickness in patients undergoing routine tests, with a digital computer radiography processing system. Analyzed 30 exhibitions in patients aged (65 ± 12) years, in the right and left caudal skull projections, for breasts with thicknesses between 45 mm and 50 mm. The calculated value of the AGD for this track thickness was (1.600 ± 0.009) mGy. The performance of mammography quality control tests was satisfactory and the AGD values obtained for the chosen thickness range is acceptable, since the threshold achievable is 1.6 mGy and the acceptable is 2 mGy. In Brazil, it is only required the input dose calculation in skin for 45 mm breasts. However, the calculation of AGD is required for different thicknesses of the breast, to identify the best mammographic pattern aiming at better image quality at the lowest dose provided the patient.

  1. Measurement of conversion coefficients between air Kerma and personal dose equivalent and backscatter factors for diagnostic X-ray beams; Determinacao experimental dos coeficientes de conversao de Kerma no ar para o equivalente de dose pessoal, Hp(d), e fatores de retroespalhamento em feixes de raios-x diagnostico

    Energy Technology Data Exchange (ETDEWEB)

    Rosado, Paulo Henrique Goncalves

    2008-07-01

    Two sets of quantities are import in radiological protection: the protection and operational quantities. Both sets can be related to basic physical quantities such as kerma through conversion coefficients. For diagnostic x-ray beams the conversion coefficients and backscatter factors have not been determined yet, those parameters are need for calibrating dosimeters that will be used to determine the personal dose equivalent or the entrance skin dose. Conversion coefficients between air kerma and personal dose equivalent and backscatter factors were experimentally determined for the diagnostic x-ray qualities RQR and RQA recommended by the International Electrotechnical Commission (IEC). The air kerma in the phantom and the mean energy of the spectrum were measured for such purpose. Harshaw LiF-100H thermoluminescent dosemeters (TLD) were used for measurements after being calibrated against an 180 cm{sup 3} Radcal Corporation ionization chamber traceable to a reference laboratory. A 300 mm x 300 mm x 150 mm polymethylmethacrylate (PMMA) slab phantom was used for deep-dose measurements. Tl dosemeters were placed in the central axis of the x-ray beam at 5, 10, 15, 25 and 35 mm depth in the phantom upstream the beam direction Another required parameter for determining the conversion coefficients from was the mean energy of the x-ray spectrum. The spectroscopy of x-ray beams was done with a CdTe semiconductor detector that was calibrated with {sup 133} Ba, {sup 241} Am and {sup 57} Co radiation sources. Measurements of the x-ray spectra were carried out for all RQR and RQA IEC qualities. Corrections due to the detector intrinsic efficiency, total energy absorption, escape fraction of the characteristic x-rays, Compton effect and attenuation in the detector were done aiming an the accurate determination of the mean energy. Measured x-ray spectra were corrected with the stripping method by using these response functions. The typical combined standard uncertainties of

  2. Avaliacao da seguranca de diferentes doses de suplementos de acido folico em mulheres do Brasil

    Directory of Open Access Journals (Sweden)

    Quenia dos Santos

    2013-10-01

    Full Text Available OBJETIVO Avaliar a distribuição da ingestão de ácido fólico e a segurança de diferentes doses de suplementos em mulheres em idade reprodutiva. MÉTODOS Foram utilizados dados de consumo a partir de dois dias não consecutivos de registro alimentar de 6.837 mulheres em idade reprodutiva (19 a 40 anos participantes do Inquérito Nacional de Alimentação, módulo da Pesquisa de Orçamentos Familiares 2008-2009. Médias e percentis de consumo habitual de folato natural e ácido fólico foram estimados utilizando o método do National Cancer Institute . Cinco cenários foram simulados somando-se diferentes doses diárias de fortificação (400 mcg, 500 mcg, 600 mcg, 700 mcg e 800 mcg ao ácido fólico oriundo dos alimentos consumidos pelas mulheres. Comparou-se o total de ácido fólico (dieta + suplemento com o nível máximo de ingestão tolerável (UL = 1.000 mcg para definir a dose segura de suplementação. RESULTADOS Mulheres com ingestão habitual de ácido fólico acima do nível máximo de ingestão tolerável foram observadas para doses de suplemento de 800 mcg (7,0% das mulheres. Abaixo desse valor, qualquer dose de suplementação mostrou-se segura. CONCLUSÕES O uso de suplementos de até 700 mcg de ácido fólico mostrou-se seguro.

  3. Use of LabSOCS for determination of specific concentrations of {sup 40}K, {sup 238}U and {sup 232}Th in fertilizer samples; Uso de LabSOCS no calculo da eficiencia de detecao para determinacao da concentracao especifica de {sup 40}K, {sup 238}U e {sup 232}Th em amostras de fertilizantes

    Energy Technology Data Exchange (ETDEWEB)

    Garcez, Ricardo Washington Dutra; Lopes, Jose Marques; Silva, Ademir Xavier da, E-mail: rgarcez@con.ufrj.br, E-mail: marqueslopez@yahoo.com.br [Coordenacao dos Programas de Pos-Graduacao em Engenharia (COPPE/UFRJ), Rio de Janeiro, RJ (Brazil). Programa de Engenharia Nuclear; Domingues, Alessandro Mariano; Lima, Marco Frota, E-mail: slessandrodomingues@fisica.if.uff.br, E-mail: marcofrotalima@yahoo.com.br [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Instituto de Biologia

    2015-07-01

    Use of fertilizer is an established practice worldwide to promote agricultural productivity increased without increasing the planted area, resulting in native forests protection and increase of the food availability. Some kinds of fertilizer have in their chemical composition some radionuclides due the origin of its feedstock, such as {sup 238}U, the {sup 232}Th, and their descendants, beyond {sup 40}K. Knowledge of the radioactivity levels in the environment is great importance to know the gamma radiation dose that the human being is exposed. For identification and quantitation of radionuclides, it was used gamma spectrometry where HPGe detector was used to obtain the spectra, and LabSOCS software for calculating the detection efficiency for each energy. The values of {sup 232}Th specific concentrations ranged from 4.1 to 368.1 Bq.Kg{sup -1} , the values of {sup 238}U specific concentrations ranged from 16.0 to 647.7 Bq.Kg{sup -1} and {sup 40}K specific concentrations ranged from 19.1 to 12713 Bq.Kg{sup -1} . Concentrations of values are consistent with those found in literature. (author)

  4. Determination of the frequency of polymorphisms in genes related to the genome stability maintenance of the population residing at Monte Alegre, PA (Brazil) municipality; Determinacao da frequencia de polimorfismos em genes relacionados a manutencao da estabilidade do genoma na populacao residente no municipio de Monte Alegre, PA

    Energy Technology Data Exchange (ETDEWEB)

    Hozumi, Cristiny Gomes

    2010-07-01

    The human exposure to ionizing radiation coming from natural sources is an inherent feature of human life on earth, for man and all living things have always been exposed to these sources. Ionizing radiation is a known genotoxic agent which can affect the genomic stability and genes related to DNA repair may play a role when they have committed certain polymorphism. This study aimed to analyze the frequency of polymorphisms (SNPs) in genes of DNA repair and cell cycle control: hOGG1 (Ser326Cys), XRCC3 (Thr241 Met) and p53 (Arg72Pro) in saliva samples from a population located Monte Alegre, state of Para were collected in August 2008 and 40 samples of men and 46 samples of women, adding a total of 86 samples. By RFLP was determined the frequency of homozygous genotypes and / or heterozygous for polymorphic genes. The I)OGG1 gene was 5% of the allele 326Cys, XRCC3 gene found about 21 % of the allele 241 Met and p53 gene showed 40.8% of the 72Pro allele. And the genotype frequencies of individuals for the three genes were 91.04%, 88.06% and 59.7% for homozygous wild genotype, 5.97%, 11.94% and 22.39% for heterozygote genotype and 2,99%, zero and 17:91% for homozygous polymorphic hOGG1 genes respectively, XRCC3, p53. These values are similar to those found in previous studies. The influence of these polymorphisms, which are involved in DNA repair and consequent genotoxicity induced by radiation depends on dose and exposure factors such as smoking, which is statistically a factor in public health surveillance in the region. This study gathered information and molecular epidemiology in Monte Alegre, that help to characterization of local population. (author)

  5. Tratamento da esquitossomose mansoni pela oxamniquine em dose única, pela via oral

    Directory of Open Access Journals (Sweden)

    Aluizio Prata

    1976-06-01

    Full Text Available A oxamniquine em cápsulas foi usada no tratamento de 132 doentes com esquistossomose mansoni crônica, sendo 129 com a forma hepato-intestinal e 3 com a forma hepato-esplênica. A dose foi de 10 mg por quilo de peso corporal em 34 pacientes, 12.5 mg em 35 e 15 mg em 63. A tolerância foi excelente em 43,2% dos tratados, boa em 48,5% e satisfatória em 8,3%. As queixas mais freqüentes foram tonturas e sonolência, que aparecem logo após a ingestão da droga e são fugazes. Os exames de laboratório mostraram em um ou outro paciente somente discreta retenção de bromosulfaleina, aumento de transaminase e da bilirrubina, insuficientes para caracterizar uma hepatoxicidade evidente. O seguimento dos pacientes se prolongou por mais de quatro meses e constou de pelo menos cinco exames de fezes pelo método de sedimentação. Todos os exames foram negativos em 20 (66,66% pacientes que tomaram 10 mg, em 13 (56,52% que tomaram 12.5 mg e em 41 (89,13% que tomaram 15 mg. Excluindo-se os menores de 16 anos subiu a 95% a negatividade entre os que foram tratados com 15 mg.

  6. Estudo de dose adequada da droga RO42-1611 (Arteflene) no tratamento da malária por Plasmodium falciparum

    OpenAIRE

    SILVA, Rita do Socorro Uchôa

    1997-01-01

    A resistência crescente do P. falciparum aos antimaláricos habitualmente empregados, torna urgente a avaliação de novas drogas. O Ro 42-1611 é um antimalárico derivado da planta chinesa Arlabotrys uncinatus. Usado apenas na África em três trabalhos no tratamento da malária por P. falciparum, tem sua ação desconhecida em sul-americanos com esta doença. Apesar do efeito antimalárico ter sido comprovado, ainda não se encontrou a dose adequada para o tratamento supressivo do P. falciparum. Avalia...

  7. Resposta da soja e do eucalipto ao aumento da densidade do solo e a doses de fósforo Soybean and eucalyptus response to increased soil density and phosphorus doses

    Directory of Open Access Journals (Sweden)

    Marco Aurélio Vitorino Ribeiro

    2010-08-01

    Full Text Available O uso agrícola e o manejo de solos de Cerrado frequentemente causam sua compactação, reduzindo sua porosidade e disponibilidade de água e nutrientes, com efeito negativo sobre o crescimento e o desenvolvimento das culturas. O presente trabalho teve por objetivo avaliar os efeitos da densidade do solo e de doses de P no crescimento da soja e do eucalipto em solos com diferentes texturas: um Latossolo Vermelho (LV muito argiloso e outro Latossolo Vermelho-Amarelo (LVA textura média. Em vasos plásticos de 1,8 L, com 1,6 dm³ de solo, foram testadas, para o LV, as densidades de 0,90, 1,10 e 1,30 kg dm-3 e as doses de 0, 100, 200, 400 e 800 mg dm-3 de P, e para o LVA, as densidades de 1,30, 1,50 e 1,70 kg dm-3 e as doses de 0, 75, 150, 300 e 600 mg dm-3 de P. As plantas de soja e de eucalipto foram colhidas 40 e 80 dias após a semeadura, respectivamente. Foram avaliadas: matéria seca da parte aérea (MSPA e de raízes (MSR, acúmulo de P na MSPA (P-PA e MSR (P-R, nas duas espécies, e altura do eucalipto. Os resultados mostraram que o aumento da densidade do solo influenciou negativamente no crescimento da soja e do eucalipto, especialmente no solo LV e nas maiores doses de P; a resposta das plantas às doses de P aplicadas foi menor com o aumento da densidade do solo; e o aumento da densidade foi mais prejudicial ao crescimento do eucalipto - espécie mais eficiente na recuperação do P aplicado aos solos. De modo geral, o efeito negativo do aumento da densidade dos solos sobre a produção de MSPA das espécies, nas doses menores de P, é compensado quando as maiores doses de P são aplicadas.Agriculture and soil management in the Cerrado can cause soil compaction, resulting in decreased porosity and water and nutrient availability, with a negative impact on plant growth and development. The objective of this study was to evaluate the effect of soil density and phosphorus doses (P on soybean and eucalyptus grown in two Cerrado oxisols with

  8. Tratamento da esquitossomose mansoni pela oxamniquine em dose única, pela via oral

    Directory of Open Access Journals (Sweden)

    Aluizio Prata

    1976-06-01

    Full Text Available A oxamniquine em cápsulas foi usada no tratamento de 132 doentes com esquistossomose mansoni crônica, sendo 129 com a forma hepato-intestinal e 3 com a forma hepato-esplênica. A dose foi de 10 mg por quilo de peso corporal em 34 pacientes, 12.5 mg em 35 e 15 mg em 63. A tolerância foi excelente em 43,2% dos tratados, boa em 48,5% e satisfatória em 8,3%. As queixas mais freqüentes foram tonturas e sonolência, que aparecem logo após a ingestão da droga e são fugazes. Os exames de laboratório mostraram em um ou outro paciente somente discreta retenção de bromosulfaleina, aumento de transaminase e da bilirrubina, insuficientes para caracterizar uma hepatoxicidade evidente. O seguimento dos pacientes se prolongou por mais de quatro meses e constou de pelo menos cinco exames de fezes pelo método de sedimentação. Todos os exames foram negativos em 20 (66,66% pacientes que tomaram 10 mg, em 13 (56,52% que tomaram 12.5 mg e em 41 (89,13% que tomaram 15 mg. Excluindo-se os menores de 16 anos subiu a 95% a negatividade entre os que foram tratados com 15 mg.Oxamniquine in capsules was used in the treatment of 132 patients with chronic Schistosoma mansoni infections. 129 having the hepato intestinal form and 3 the hepato splenic form. The dose was 10mg per kiio body weight in 34 patients, 12.5mg in 35 and 15mg ip 63. The tolerance was excellent in 43.2% of those treated, good in 48.5% and satisfactory in 8.3%. The most frequent complaints were dizziness and somnolence which appear soon after ingestion and was transitory. Laboratory investigations showed in a few patients bromosutphalein retention, raised transaminases or biiirubin but insufficient to constitute hepatoxicity. The follow-up of the patients continued for more than 4 months and consisted of five or more examinations by a sedimentation method. AH the examinations were negative in 20 (66.66% patients who took lOmg, in 13 (56.52% who took 12.5mg and in 41 (89.13% who took 15mg

  9. Preliminary characterization of dose in personnel of interventional radiology; Caracterizacao preliminar da dose em profissionais de radiologia intervencionista

    Energy Technology Data Exchange (ETDEWEB)

    Godolfim, Laura Larre; Anes, Mauricio; Bacelar, Alexandre; Lykawka, Rochelle [Hospital de Clinicas de Porto Alegre (HCPA), Porto Alegre, RS (Brazil)

    2016-07-01

    Exposure to X-rays of Interventional Radiology professionals (IR) impacts in the high dose rate received by these individuals, and there are reports of biological effects of this professional activity. Therefore, it is fomented greater control over the doses received by these workers. This research intends to characterize the doses received by the professionals during IR procedures. We evaluated the doses of radiologists, anesthesiologists and nursing staff of the Hospital de Clinicas de Porto Alegre, through measures with dosimeters of the OSL type, distributed in up to six regions of the body of these professionals. Until now were accompanied 33 cholangiography procedures and 29 embolization procedures. As a preliminary result, it was possible to identify a wide variation between doses of the professionals of the same function in each procedure. In overview, the dose of the professionals presented in descending order as a radiologist 1> radiologist 2 > anesthetist > nursing. (author)

  10. Evaluation of the absorbed dose in odontological computerized tomography; Avaliacao da dose absorvida em tomografia computadorizada odontologica

    Energy Technology Data Exchange (ETDEWEB)

    Legnani, Adriano; Schelin, Hugo R.; Rocha, Anna Silvia P.S. da, E-mail: schelin@utfpr.edu.b, E-mail: anna@utfpr.edu.b [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil); Khoury, Helen J., E-mail: khoury@ufpe.b [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil)

    2011-10-26

    This paper evaluated the absorbed dose at the surface entry known as 'cone beam computed tomography' (CBCT) in odontological computerized tomography. Examination were simulated with CBCT for measurements of dose. A phantom were filled with water, becoming scatter object of radiation. Thermoluminescent dosemeters were positioned on points correspondent to eyes and salivary glands

  11. Evaluation of the absorbed dose in odontological computerized tomography; Avaliacao da dose absorvida em tomografia computadorizada odontologica

    Energy Technology Data Exchange (ETDEWEB)

    Legnani, Adriano; Schelin, Hugo R; Rocha, Anna Silvia P.S. da, E-mail: schelin@utfpr.edu.b, E-mail: anna@utfpr.edu.b [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil); Khoury, Helen J., E-mail: khoury@ufpe.b [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil)

    2011-10-26

    This paper evaluated the absorbed dose at the surface entry known as 'cone beam computed tomography' (CBCT) in odontological computerized tomography. Examination were simulated with CBCT for measurements of dose. A phantom were filled with water, becoming scatter object of radiation. Thermoluminescent dosemeters were positioned on points correspondent to eyes and salivary glands

  12. Valdose program: methodologies for dose assessment in internal contamination, 1997 census; Programma valdose: metodologie di valutazione della dose da contaminazione interna, censimento 1997

    Energy Technology Data Exchange (ETDEWEB)

    Castellani, C.M.; Battisti, P.; Tarroni, G. [ENEA, Centro Ricerche `Ezio Clementel`, Bologna (Italy). Dip. Ambiente

    1998-12-31

    Dose assessment in internal dosimetry needs computational and interpretative tools that allow carrying out, as a first step, an evaluation of intake on the base of bioassay measurements or WBC measurements, and as a second step, dose evaluation on the base of estimated intake. In the frame of the MIDIA Co-ordination (WBC operating in Italy), in the first months of 1997 a census on methodologies for dose evaluation in internal contamination has been proposed. A technical form has been sent to all the WBC Centres allowing an accurate description of modalities used in each centre. 9 out of 17 centres sent the answers to the technical form in time. In this paper all the forms filled in are reported. A careful comparative evaluation of the answers has been made both for routine monitoring and for special monitoring. The various radionuclides present in the Italian reality, calculation methodologies both for intake and dose, hypotheses adopted for date, path and modalities of contaminations are also presented. Proposals for conforming to the methodology in Italy after the introduction of the models following ICRP 60 publication that are the base of the Euratom 96/29 Directive are also discussed. [Italiano] La valutazione di dose in contaminazione interna necessita di strumenti interpretativi che permettano di effettuare in una prima la valutazione dell`intake sulla base delle misure dei campioni biologici o del corpo intero (WBC), ed in una seconda fase la valutazione della dose sulla base dell`intake. All`interno del coordinamento MIDIA dei WBC operanti in Italia e` stato proposto, nel primo trimestre del 1997, un censimento sulle metodologie di valutazione di dose da contaminazione interna. Ai diversi centri e` stato inviato una scheda tecnica che, mediante un particolareggiato schema di domande, aiutava i diversi centri nella esposizione delle modalita` di valutazione di dose che ogni centro segue. 9 au 17 centri WBC operanti al momemnto in Italia hanno inviato la

  13. Produção da bananeira nanica (1º ciclo em função da aplicação de doses de biofertilizantes líquidos

    Directory of Open Access Journals (Sweden)

    Juliara dos Santos Silva Araujo

    2014-05-01

    Full Text Available Objetivou-se com este trabalho, estudar os efeitos de 5 tipos e 10 doses de biofertilizantes na produção da bananeira Nanica (1º ciclo. O experimento foi conduzido, em condições de campo, no CCHA, pertencente a Universidade Estadual da Paraíba-UEPB, Campus Catolé do Rocha-PB. O delineamento experimental adotado foi o de blocos casualizados, com 50 tratamentos, no esquema fatorial 5 x 10, com quatro repetições, totalizando 200 parcelas experimentais. O valor do número de frutos por planta aumentou com o incremento da dose do biofertilizante B4 até um limite ótimo; o peso total de pencas por cacho aumentou linearmente com o incremento da dose de biofertilizante, atingindo o valor maior máximo na dose máxima; o peso médio de penca aumentou linearmente com o incremento da dose do biofertilizante B2, atingindo o maior valor na dose máxima; o peso médio do fruto e o peso do fruto médio aumentaram linearmente com o aumento da dose do biofertilizante B5, atingindo os maiores valores na dose máxima; a aplicação de (B5 proporcionou maior peso médio do fruto e peso do fruto médio.

  14. Avaliação do efeito da partição de comprimidos de furosemida sobre a uniformidade da dose

    Directory of Open Access Journals (Sweden)

    AMANDA APARECIDA DE ANDRADE FERREIRA

    2011-06-01

    Full Text Available Buscando avaliar a uniformidade da dose unitária de comprimidos submetidos ao procedimento de partição, este trabalho avaliou a dureza, friabilidade, variação de peso e uniformidade de conteúdo em quatro amostras de comprimidos de furosemida de 40 mg, obtidas de diferentes fornecedores. Todas as amostras estudadas atendiam às especificações oficiais antes de serem submetidas ao procedimento de partição; porém, após serem partidas, o teor de fármaco nas metades apresentou excessiva variação, mostrando que esse procedimento pode ser terapeuticamente desaconselhável. Palavras-chave: Partição de comprimidos. Uniformidade de dose. Comprimidos. Terapia oral. ABSTRACT Influence of tablet splitting on dose uniformity In order to assess the uniformity of the dose of active ingredient in the halves of tablets subjected to splitting, the hardness, friability, weight variability and uniformity of content were studied in four samples of 40 mg tablets of furosemide obtained on the Brazilian market, both whole and split into two parts. All the tablets complied with the official specifications before splitting, but, after this procedure, the drug content in the halves showed excessive variation, indicating that this procedure is inadvisable. Keywords: Tablet fractioning. Uniformity of dose. Tablets. oral therapy.

  15. Otimização agroeconômica da cenoura fertilizada com diferentes doses de jitirana

    Directory of Open Access Journals (Sweden)

    Francisco Bezerra Neto

    Full Text Available A utilização de espécies espontâneas do bioma Caatinga como adubo verde tem-se constituído opção importante na produção de hortaliças com o intuito de alcançar o equilíbrio entre aumento na produtividade das culturas e exploração do meio ambiente. O objetivo deste trabalho foi avaliar o uso de diferentes doses de jitirana como adubo verde no desempenho agroeconômico da cenoura em cultivo solteiro. O estudo foi conduzido na Fazenda Rafael Fernandes, distrito de Alagoinha, Estado do Rio Grande do Norte, no período de novembro de 2010 a fevereiro de 2011. O delineamento experimental foi de blocos ao acaso com quatro tratamentos repetidos quatro vezes. Os tratamentos consistiram das seguintes doses de jitirana: 7,5; 15; 22,5 e 30 t ha-1 em base seca. A cultivar de cenoura semeada foi a Brasília. As características avaliadas foram: altura de plantas, número de hastes por planta, massa seca da parte aérea e de raízes, produtividades comercial e total de raízes, produtividade classificada de raízes e os indicadores econômicos: renda bruta, renda líquida, taxa de retorno e índice de lucratividade. A otimização do desempenho agroeconômico da cenoura em cultivo solteiro é viabilizada com a incorporação de 13 t ha-1 de jitirana ao solo. O cultivo da cenoura é viável agroeconomicamente com o uso da jitirana como adubo verde.

  16. Optimization of the therapeutic dose of {sup 131}I for thyroid differentiated carcinoma; Otimizacao da dose terapeutica com {sup 131}I para carcinoma diferenciado da tiroide

    Energy Technology Data Exchange (ETDEWEB)

    Lima, Fabiana Farias de

    2002-09-01

    I-131 thyroid cancer therapy is based on the strategy of concentrating radioactive iodine in the thyroid tissue, to completetly eliminate thyroid tissue and functioning thyroid cancer metastases remaining after thyroidectomy. In Brazil, fixed activities of {sup 131} I generally are given, sometimes either delivering insufficient activities to ablate all of the remnants, or unnecessarily high activities, with patients remaining in the hospital for some period of time. This investigation proposes a protocol of individualized planning of ablative doses, based on individual patients metabolisms and measured thyroid remnant masses. Simulated thyroid remnants were fabricated in various forms, volumes and activities, and optimum image acquisition parameters were determined using Single-Photon Emission Computed Tomography 9SPECT). Resultant images were evaluated, to determine the apparent volumes and the {sup 131} I concentrations. I-131 metabolism was studied in 9 patients who had undergone thyroidectomies. Their thyroid remnant masses were determined applying the same parameters used in SPECT simulation studies, and the optimum activity for their therapy was calculated and compared to the established fixed activity of 3.7 GBq (100 mCi), which would have normally been assigned. Background subtraction using the method of percent maximum counts, using a value of 67.5%, combined with scatter correction (triple energy window method), was shown to be optimum for SPECT quantification of volumes between 3-10 ml. Errors in the method were below 9% for sources with regular geometries and around 11% for sources with irregular geometries. In the patient studies, it was observed that 78% of patients could have received reduced activities of {sup 131} (from 0.8-3-2. GBq (20-87 nCi). In addition, 33% of these patients could have received low enough activities to have discharged from the hospital, using an individualized administration scheme. This could also have resulted in a dose

  17. Contribution of the height in the ambient dose equivalent; Contribuicao da altitude no equivalente de dose ambiente

    Energy Technology Data Exchange (ETDEWEB)

    de Campos, Vicente de P.; Manzoli, Jose E.; Alipio, Osvaldo C.; Carneiro, Janete C.G.; Rodrigues Junior, Orlando, E-mail: vpcampos@ipen.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2013-07-01

    The aim of this study is to evaluate the contribution of natural sources in the ambient dose equivalent. The evaluation of the levels of environmental radiation was performed using thermoluminescent dosimeters CaSO{sub 4} of doped C, which have high sensitivity and little fading. The dosimeters were placed in five locations at different altitudes, covering the period from three to nine years depending on their location. The results were grouped according to the use and occupation of land in the vicinity of the measurement point.

  18. Optimization of dose in computerized radiology exams of the hands; Otimizacao da dose em exames de radiologia computadorizada de mao

    Energy Technology Data Exchange (ETDEWEB)

    Pavan, Ana Luiza Menegatti; Alvarez, Matheus; Alves, Allan Felipe Fattori; Dela Rosa, Maria Eugenia; Miranda, Jose Ricardo de Arruda, E-mail: analuiza@ibb.unesp.br [Universidade Estadual Paulista Julio de Mesquita Filho (IBB/UNESP), Botucatu, SP (Brazil). Inst. de Biofisica. Departamento de Fisica e Biofisica; Pina, Diana Rodrigues de; Ribeiro, Sergio Marrone [Universidade Estadual Paulista Julio de Mesquita Filho (FMB/UNESP), Botucatu, SP (Brazil). Fac. de Medicina. Dept. de Doencas Tropicais e Diagnostico por Imagem; Duarte, Sergio Barbosa [Centro Brasileiro de Pesquisas Fisicas (CBPF), Rio de Janeiro, RJ (Brazil)

    2014-07-01

    Fractures and dislocations of the hand are some of the most frequently encountered injuries of the musculoskeletal system traumas. To evaluate these lesions radiography is the investigation of choice, and is rarely needed the help of other images to establish the diagnosis and treatment. The image quality of the X-ray examination is therefore essential. In this study a homogeneous phantom hand was developed for use in the hand image optimization process. In this procedure were quantified for different tissue thicknesses which are an anthropomorphic hand phantom. To perform the classification and quantification of tissue was applied membership functions in histograms of CT scans. The same procedure was adopted for 30 retrospective examinations of patients in the Hospital of the Faculty of Medicine of Botucatu UNESP (HCFMB-UNESP). The homogeneous phantom built was used to calibrate the techniques used in clinical routine (RC). Such calibrated techniques were used to acquire images of anthropomorphic phantom. These images were analyzed by Visual Grading Method (VFA) by experienced radiologists in the area. The image with better grade in AGV and lower dose was chosen as the Gold Standard. The results showed concordance between the tissue thicknesses which constitute the anthropomorphic phantom and the sample evaluated patients, with variations between 12.63% and 6.48% for soft tissue and bone, respectively. The Gold Technical Standard compared with the technique normally used in the CR reduces dose charge 41.28% and 33.18% in the tube.

  19. Efeitos das isoflavonas em altas doses sobre o útero da rata Effects of high-dose isoflavones on rat uterus

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    Adriana Aparecida Ferraz Carbonel

    2011-10-01

    Full Text Available OBJETIVO: Avaliar o efeito de altas doses de isoflavonas no útero de ratas adultas castradas. MÉTODOS: Ratas virgens ovariectomizadas (n = 40 foram tratadas por 30 dias consecutivos com veículo (GCtrl ou genisteína nas concentrações 42 (GES42, 125 (GES125 e 250 (GES250 µg/g de peso corporal ao dia. O extrato de soja e o veículo (propilenoglicol foram administrados por gavagem. Ao final do experimento, foi realizada dosagem sérica de 17 β-estradiol e progesterona, avaliou-se o peso dos animais e dos úteros e foi feito exame colpocitológico. Fragmentos do terço médio dos cornos uterinos foram fixados em formol a 10% e processados para inclusão em parafina para estudo histológico. Cortes de 5 µm de espessura foram corados pelo HE e destinados a estudo em microscopia de luz. Analisou-se a histomorfologia do endométrio, área endometrial, número e área ocupada pelas glândulas, assim como a concentração de eosinófilos presentes na lâmina própria. Os dados numéricos obtidos foram submetidos à análise de variância complementada pelo teste de Tukey-Kramer (p GES125 do que nos outros grupos (GES250 > GES125 > GES42 = GCtrl; p OBJECTIVE: To evaluate the effects of high-dose isoflavones on the uterus of castrated adult rats. METHODS: Adult, ovariectomized virgin rats (n = 40 were treated by gavage during 30 consecutive days with vehicle (propylene glycol, group GCtrl or different doses of genistein: 42 (group GES42, 125 (GES125, or 250 (GES250 µg/g body weight per day. Animals were killed, weighed, vaginal and uterine samples were taken for cytologic evaluation, and serum levels of 17 β-estradiol and progesterone were determined. The middle third of the uterine horns was dissected, fixed in 10% formaldehyde and processed for paraffin inclusion; 5-µm thick sections were obtained and stained with HE for further histological study under light microscopy. The endometrial morphology and area, number and area of glands, and number

  20. Diagnóstico sorológico da brucelose bovina em animais adultos vacinados com dose reduzida da cepa 19 de Brucella abortus Serological diagnosis of bovine brucellosis in adult herd vaccinated with Brucella abortus strain 19 reduced dose

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    Gustavo Coelho Jardim

    2006-09-01

    Full Text Available Com o presente trabalho avaliou-se o uso de dose reduzida da vacina produzida com a amostra 19 de Brucella abortus, em rebanho adulto negativo para a enfermidade, por meio de técnicas de diagnóstico sorológico preconizadas pelo Programa Nacional de Controle e Erradicação da Brucelose e Tuberculose Animal e por um ensaio indireto de imunoadsorção enzimática (ELISA ID. A prova de fixação de complemento detectou 46,77% de positivos, o antígeno acidificado tamponado 67,74%, o 2-mercaptoetanol com soroaglutinação lenta 87,09% e o ELISA ID 100%. A dose reduzida interferiu no diagnóstico sorológico. Nenhuma das técnicas apresentou especificidade adequada para uso em rebanho nestas condições, até 3 meses após a vacinação.The study evaluated the use of a reduced dose of the Brucella abortus strain 19 vaccine, in an adult herd negative for the disease, by serological diagnostic techniques, advocated by the Brazilian Program for Animal Brucellosis and Tuberculosis Control and Eradication, and by an indirect ELISA. The complement fixation test detecteed 46.77% positives, the rose bengal test 67.74%, the mercaptoethanol with standard agglutination test 87.09% and the ELISA ID 100%. The reduced dose influenced the serological diagnosis. None of the techniques reached a suitable specificity for use in the herd under those conditions, up to 3 months after vaccination.

  1. Determination of conversion factors of kerma and fluence to ambient dose equivalent for X-rays generated between 50 kV{sub p} to 125 kV{sub p}; Determinacao dos fatores de conversao de kerma no ar e de fluencia para o equivalente de dose ambiental para raios-X gerados no intervalo de 50 kV{sub p} a 125 kV{sub p}

    Energy Technology Data Exchange (ETDEWEB)

    Nogueira, Maria do Socorro

    1997-12-31

    The ambient dose equivalent was determined experimentally on the interval of energy of X ray applied in diagnostic radiology. A PMMA sphere was used to simulate the trunk human (phantom), based on the definition of the report ICRU 39. The absorbed dose in different positions in the phantom was determined using LiF-TLD 100. The X ray spectra were measured with a high-purity germanium detector (HP Ge). It was also determined the HVL and the effective energy in this energy range. The conversion coefficient of the K{sub air} and {Phi} to H{sup *}(d) were determined to 10, 50 and 60 mm deep in the PMMA sphere. The obtained values were compared with data of the literature. The maximum uncertainty obtained for the coefficients was 7.2%. All parameters were also determined to the X ray quality of the incident and transmitted beam by the patient, according to the recommendation of the standard DIN 6872. The conversion factor was calculated for those situations where the X-ray beam is transmitted by a layer and Pb and it is necessary to estimate the effective dose, as in the case of shielding project of radiology diagnosis room. (author) 51 refs., 35 figs., 15 tabs.

  2. Determination of conversion factors of kerma and fluence to ambient dose equivalent for X-rays generated between 50 kV{sub p} to 125 kV{sub p}; Determinacao dos fatores de conversao de kerma no ar e de fluencia para o equivalente de dose ambiental para raios-X gerados no intervalo de 50 kV{sub p} a 125 kV{sub p}

    Energy Technology Data Exchange (ETDEWEB)

    Nogueira, Maria do Socorro

    1998-12-31

    The ambient dose equivalent was determined experimentally on the interval of energy of X ray applied in diagnostic radiology. A PMMA sphere was used to simulate the trunk human (phantom), based on the definition of the report ICRU 39. The absorbed dose in different positions in the phantom was determined using LiF-TLD 100. The X ray spectra were measured with a high-purity germanium detector (HP Ge). It was also determined the HVL and the effective energy in this energy range. The conversion coefficient of the K{sub air} and {Phi} to H{sup *}(d) were determined to 10, 50 and 60 mm deep in the PMMA sphere. The obtained values were compared with data of the literature. The maximum uncertainty obtained for the coefficients was 7.2%. All parameters were also determined to the X ray quality of the incident and transmitted beam by the patient, according to the recommendation of the standard DIN 6872. The conversion factor was calculated for those situations where the X-ray beam is transmitted by a layer and Pb and it is necessary to estimate the effective dose, as in the case of shielding project of radiology diagnosis room. (author) 51 refs., 35 figs., 15 tabs.

  3. Lodo de esgoto e sistema radicular da pupunheira Sewage sludge doses and the root system of peach palm

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    Fernando Vinicio Armas Vega

    2005-04-01

    Full Text Available Os efeitos do lodo de esgoto sobre o sistema radicular da pupunheira foram estudados em experimento em campo, em blocos casualizados, instalado em Ubatuba (SP, em julho 2001, na densidade de 5.000 plantas ha-1. As doses de lodo de esgoto fresco (79,7 % de umidade utilizadas foram de 0, 38, 76 e 152 t ha-1, equivalentes a 0, 100, 200 e 400 kg ha-1 de N. Os tratamentos foram aplicados no sulco de plantio, adicionando-se 15 g por planta de KCl como fonte de K. A análise do sistema radicular foi efetuada doze meses após, por meio de trado e de trincheiras e com o auxílio de fotos digitais. Detectou-se que o sistema radicular de pupunheiras com um ano de campo estava concentrado nas camadas superficiais (acima de 75 % nos primeiros 20 cm, assim como em distâncias de até 0,5 m da base da planta. O lodo de esgoto modificou positivamente a densidade do solo, alterando também favoravelmente a densidade das raízes. Houve aumento na biomassa radicular proporcional às doses de lodo de esgoto, existindo uma relação direta daquela com a fitomassa aérea. Doses de lodo equivalentes a 200 e 400 kg de N contribuíram para aprofundar o sistema radicular e proporcionaram maior quantidade relativa de raízes finas.The effects of sewage sludge doses on the root system of peach palm were studied in a field experiment, in randomized complete blocks, carried out in Ubatuba, state of São Paulo, Brazil. The trial was set up in July 2001, with a density of 5,000 plants ha-1. The sewage sludge doses (79.7 % water content were 0, 38, 76, and 152 t ha-1, which were equivalent to doses of 0, 100, 200, and 400 kg ha-1 of N. The treatments were applied in the planting furrow, and every plant was provided with K by a dose of 15 g potassium chloride. The root system was analyzed one year after planting using soil auger and digging of trenches and with the help of digital images. It was concluded that the root system of one-year old peach palm was concentrated in the

  4. Uso de diferentes doses de manipueira na cultura da alface em substituição à adubação mineral Use of different doses of cassava wastewater in lettuce crop in substitution of mineral fertilizer

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    Anamaria de S. Duarte

    2012-01-01

    Full Text Available Objetivou-se, neste trabalho, verificar o efeito ocasionado pelo uso de diferentes doses de manipueira nas características agronômicas da alface em substituição à adubação mineral. O referido estudo foi desenvolvido em uma área pertencente ao Departamento de Tecnologia Rural da Universidade Federal Rural de Pernambuco, Recife, PE, no período de maio a agosto de 2010. O experimento foi conduzido em ambiente protegido em delineamento inteiramente casualizado, com seis tratamentos compostos das seguintes doses: 0, 5, 15, 25, 45, 65 m³ ha-1 e cinco repetições. Utilizou-se a cultivar de alface Regina 2000, dispondo-se uma planta por vaso de 4 L. Foram avaliadas, em função das doses aplicadas, as seguintes características agronômicas da alface: área foliar, altura de planta, número de folhas, matéria fresca e matéria seca da alface. Ao final do experimento constatou-se que a dose de 45 m³ ha-1 foi a que propiciou maior ganho de altura de planta, área foliar e, consequentemente, também maior produção de matéria fresca e seca. Assim sendo, o uso da manipueira serviu como fonte de adubação para a cultura da alface, dependendo da dose aplicada.The main goal of this work was to evaluate the effect on agronomic characteristics of the lettuce when using different doses of cassava wastewater instead of mineral fertilizer. This study was conducted at the Departamento de Tecnologia Rural da Universidade Rural de Pernambuco, Recife, PE, from May to August 2010. The experiment was carried out under greenhouse conditions in a completely randomized blocks, with six treatments and five repetitions. Following doses were used: 0, 5, 15, 25, 45 and 65 m³ ha-1. The lettuce cultivar Regina 2000 was used (one plant per pot and leaf area, plant height, number of leaves, fresh leaf mass and dry leaf mass were evaluated for each dose of cassava wastewater. At the end of the experiment, the dose of 45 m³ ha-1 provided the best results by

  5. Study of phosphors determination in biological samples; Estudo da determinacao de fosforo em amostras biologicas

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Rosangela Magda de

    1994-12-31

    In this paper, phosphors determination by neutron activation analysis in milk and bone samples was studied employing both instrumental and radiochemical separation methods. The analysis with radiochemistry separation consisted of the simultaneous irradiation of the samples and standards during 30 minutes, dissolution of the samples, hold back carrier, addition precipitation of phosphorus with ammonium phosphomolibdate (A.M.P.) and phosphorus-32 by counting by using Geiger-Mueller detector. The instrumental analysis consisted of the simultaneous irradiation of the samples and standards during 30 minutes, transfer of the samples into a counting planchet and measurement of the beta radiation emitted by phosphorus-32, after a suitable decay period. After the phosphorus analysis methods were established they were applied to both commercial milk and animal bone samples, and data obtained in the instrumental and radiochemical separation methods for each sample, were compared between themselves. In this work, it became possible to obtain analysis methods for phosphorus that can be applied independently of the sample quantity available, and the phosphorus content in the samples or interference that can be present in them. (author). 51 refs., 7 figs., 4 tabs.

  6. Determination of operation time function for activimeters; Determinacao da funcao tempo de operacao para ativimetros

    Energy Technology Data Exchange (ETDEWEB)

    Sousa, C.H.S.; Peixoto, J.G.P. [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil); Araujo, G.; Padilha, L.G. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil)

    2016-07-01

    Radiation detectors must pass periodically recommended quality control tests and standardized to certify the quality of measurements, however, many studies have shown that several parameters can influence the results, however, some instrument components that can not be adjusted during calibrations may have significant importance in measurement results over the operating time. This study sought to determine the influence of the use of time in the activity measurements. The results show a trend of decreased activity measured for equipment with detectors with more operating time. (author)

  7. Evaluation of occupational exposure in intraoral radiography; Avaliacao da dose ocupacional em radiografia intraoral

    Energy Technology Data Exchange (ETDEWEB)

    Miguel, Cristiano; Barros, Frieda S.; Rocha, Anna S.P.S.; Godoi, Walmor C., E-mail: miguel_cristianoch@yahoo.com.br, E-mail: saicla@utfpr.edu.br, E-mail: annarocha@yahoo.com, E-mail: walmor.godoi@gmail.com [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil); Tilly Junior, Joao G., E-mail: joao.tilly@derax.com.br [Universidade Federal do Parana (HC/UFPR), Curitiba, PR (Brazil). Hospital das Clinicas

    2014-07-01

    The intraoral radiography is widely performed in the dental office due to low cost and agility. The doses in intraoral radiology are considered low, however it is known that doses below the threshold for deterministic radiation has the potential to induce stochastic effects. An intraoral radiography has a risk of inducing fatal cancer or serious in order of 1:10,000,000. Besides the patient, the dentist may also be being exposed to radiation during the work with the radiographics practices. The bibliographies demonstrates the lack of information on radiation protection of dentists, however, the occupational dose reduction was observed in radiology over the past 14 years. This work aims to evaluate the effective dose of radiation to which workers can be exposed dentists in dental offices to perform intraoral radiographs. In this context, a study was be conducted between June 2013 and May 2014 with 44 professionals in Curitiba city. For each dentist was given a personal dosimeter to be used for 30 days. During this period, the number of radiographies and the length of the cable triggers of the X-ray equipment was registered and, the dosimeter´s dose was read. It was observed that the cables triggers meet regulatory standards and allow dentists to get the mean minimum distance of two meters from the radiation source in 93% of cases. Through analysis of the doses, it was concluded that occupational exposures of these workers are within the recommended threshold by regulatory 453/1998 of the Ministry of Health from Brazil. (author)

  8. DESENVOLVIMENTO INICIAL DA MAMONEIRA SOB DIFERENTES FONTES E DOSES DE MATÉRIA ORGÂNICA

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    Francisco de Assis de Oliveira

    2009-01-01

    Full Text Available The culture of the castor bean comes as a promising alternative for the producing of the semi-arid Northeasterner, mainly for to present characteristics as adaptation to the climatic conditions and to present in seeds they nourish chemistries of addition importance for production of Biodiesel, however, they are still scarce studies on techniques handling of this culture, mainly as the manuring This work driven with the objective of evaluating the initial development of the castor bean submitted to different sources and doses of organic matter. The used design was it entirely randomized in factorial outline 2 x 5, with three replications. The treatments were composed by the combination of two sources (manure bovine and manure ovine and five tenors of organic matter in the composition of the substratum (0, 10, 20, 30 and 40. The appraised growth indexes were: plant height, number of leaves, stem diameter and fitomassa of the aerial part. The castor bean answered the sources and the studied doses significantly, as well as the interaction among these factors. Answer was verified forms quadratic the doses of bovine and lineal manure to the doses of manure ovine. The largest development of the plants was verified with bovine manure, in close tenors of 30%.

  9. DOSES DE LODO DE ESGOTO SOBRE O DESENVOLVIMENTO DA GRAMA BERMUDA (Cynodon dactylon)

    OpenAIRE

    NOBILE, Fabio Olivieri de; NUNES, Hugo Dias; NEVES, Jéssica Caroline

    2014-01-01

    Population growth occurred rapidly, resulting in cities with poor infrastructure on the sanitation sector. So, there was the introduction of sanitary treatment, causing difficulty in choosing alternatives for the proper disposal of sewage sludge, rich in essential nutrients for the plants. The experiment was conducted to determine the best dose of sewage sludge to Grass Cynodon dactylon. It was conducted in greenhouse in the University Center of Educational Foundation of Barretos-SP. The expe...

  10. Análise da dose do laser de baixa potência em equipamentos nacionais Analysis of low-level laser therapy doses in Brazilian equipment

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    TY Fukuda

    2008-02-01

    Full Text Available CONTEXTUALIZAÇÃO: A laserterapia de baixa potência vem sendo cada vez mais utilizada, e o crescente interesse por seus efeitos relaciona-se com a grande quantidade de publicações científicas. Muitos terapeutas e pesquisadores têm-se baseado na definição da dose do laser pela densidade energética (deltaE; porém, a grande variedade de equipamentos de laser pode levar a diferença nos resultados terapêuticos encontrados, por fornecerem parâmetros que variam de acordo com o fabricante. OBJETIVO: Analisar a energia final transmitida ao tecido ao aplicar-se a mesma deltaE em equipamentos de diferentes marcas nacionais. MATERIAIS E MÉTODOS: Foram avaliados sete equipamentos nacionais, com potência média (Pm diferentes, e foram realizadas simulações aplicando deltaE de 1J/cm² em cada aparelho, para avaliar possíveis diferenças na energia final. RESULTADOS: A mesmadeltaE aplicada em diferentes aparelhos nacionais forneceu energia final que variou entre 10 e 90mJ. Esta variação na energia deveu-se principalmente a diferenças na Pm, sendo encontrados valores entre 5,4 e 75mW. CONCLUSÃO: Esta variabilidade na energia final, que é transmitida ao tecido, indica que a deltaE parece não ser o parâmetro que melhor descreve a dose a ser utilizada. É preciso mencionar não só a deltaE, mas também a energia final, para que se possa estabelecer a dose para obtenção do melhor resultado terapêutico.INTRODUCTION: Low-level laser therapy is becoming more popular and there is a growing interest in its effects, as reflected in the increased number of articles published about the subject. Many therapists and researchers have used a laser dose definition based on energy density (deltaE. However, the variety of laser equipments may lead to differences in the therapeutic results found, since the parameters supplied by these equipments vary according to the manufacturer. OBJECTIVE: To analyze the final energy transmitted to the tissue when

  11. Cocleotoxicidade da gentamicina por doses habituais para neonatos - estudo funcional A functional study on gentamicin-related cochleotoxicity in its conventional dose in newborns

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    Carla Luiza Baggio

    2010-02-01

    Full Text Available A identificação precoce das alterações auditivas possibilita a intervenção ainda no "período crítico" e ideal de estimulação da linguagem e da audição. A ototoxicidade infantil é um tema bastante controverso. Têm sido relatadas percentagens variáveis de casos de ototoxicidade em crianças com vários antibióticos aminoglicosídeos. Os principais grupos pediátricos que recebem antibióticos aminoglicosídeos são recém-nascidos com infecções graves na UTI neonatal. OBJETIVOS: Verificar o aspecto funcional das células ciliadas externas da cóclea a esquemas terapêuticos utilizados para o tratamento de infecções no período neonatal. FORMA DE ESTUDO: Experimental. MATERIAL E MÉTODO: Foram estudadas 26 cobaias albinas, através das emissões otoacústicas por produto de distorção, prévia e posteriormente a aplicação de gentamicina. RESULTADOS: Em todas as avaliações, o estado funcional das células ciliadas externas, estudadas pelas emissões otoacústicas por produto de distorção, mostraram-se preservadas. CONCLUSÃO: Neste experimento não foram observadas alterações no funcionamento das células ciliadas externas de cobaias albinas sob tratamento com gentamicina nas doses de 4 mg/Kg/dia e 2,5 mg/Kg/dia a cada 12 horas, por 10 e 14 dias.The early identification of hearing impairment allows for an intervention still in the "critical" and ideal period of hearing and language stimulation. Pediatric ototoxicity is a very controversial topic. There have been variable percentages of ototoxicity cases in children with different aminoglycosides antibiotics. The main pediatric groups whom receive aminoglycosides are newborns with severe infections on the neonatal ICU. AIM: to check the functional aspect of the cochlear external hair cells and treatment regimens used to treat infections during the neonatal period. STUDY DESIGN: Experimental. Materials and Methods: we studied 26 albino guinea pigs, through distortion

  12. First Italian intercomparison on methodologies for dose assessment from internal contamination. Results and perspectives; Primo interconfronto italiano sulle metodiche di valutazione di dose da contaminazione interna: risultati e prospettive

    Energy Technology Data Exchange (ETDEWEB)

    Castellani, C.M.; Battisti, P.; Tarroni [ENEA, Centro Ricerche Ezio Clementel, Bologna (Italy). Dipt. Ambiente

    1998-07-01

    In the frame of the MIDIA activities (coordination of whole body counters operating in Italy) an intercomparison on dose evaluation methods was promoted and carried out between October 1995 and March 1996 by 5 WBC centres. The main results related to the estimation of Intake and effective dose equivalent on the four case studies are reported. A comparison with European preliminary results is also presented. Finally perspectives related to the quality assurance of internal dosimetry estimates are indicated. [Italian] Vengono riportati i risultati delle valutazioni di Intake e di equivalente di dose nei centri MIDIA (coordinamento dei WBC operanti in Italia) per effettuare un interconfronto sui metodi di valutazione di dose da contaminazione interna utilizzando casi di studio reperiti in ambiente europeo. Vengono indicate le prospettive per la valutazione della qualita' della stima di dose in dosimetria interna.

  13. Rectal dose assessment in patients submitted to high-dose-rate brachytherapy for uterine cervix cancer; Avaliacao da dose no reto em pacientes submetidas a braquiterapia de alta taxa de dose para o tratamento do cancer do colo uterino

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Jetro Pereira de [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Faculdade de Medicina; Rosa, Luiz Antonio Ribeiro da [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)], e-mail: lrosa@ird.gov.br; Batista, Delano Valdivino Santos; Bardella, Lucia Helena [Instituto Nacional de Cancer (INCA), Rio de Janeiro, RJ (Brazil). Unit of Medical Physics; Carvalho, Arnaldo Rangel [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil). Lab. of Thermoluminescent Dosimetry

    2009-03-15

    Objective: The present study was aimed at developing a thermoluminescent dosimetric system capable of assessing the doses delivered to the rectum of patients submitted to high-dose-rate brachytherapy for uterine cervix cancer. Materials and methods: LiF:Mg,Ti,Na powder was the thermoluminescent material utilized for evaluating the rectal dose. The powder was divided into small portions (34 mg) which were accommodated in a capillary tube. This tube was placed into a rectal probe that was introduced into the patient's rectum. Results: The doses delivered to the rectum of six patients submitted to high-dose-rate brachytherapy for uterine cervix cancer evaluated by means of thermoluminescent dosimeters presented a good agreement with the planned values based on two orthogonal (anteroposterior and lateral) radiographic images of the patients. Conclusion: The thermoluminescent dosimetric system developed in the present study is simple and easy to be utilized as compared to other rectal dosimetry methods. The system has shown to be effective in the evaluation of rectal doses in patients submitted to high-dose-rate brachytherapy for uterine cervix cancer. (author)

  14. Estudo dos efeitos de diferentes tipos e doses de biofertilizantes na produção e na qualidade da produção da videira “Isabel”

    Directory of Open Access Journals (Sweden)

    Atos Tavares Gomes

    2014-06-01

    Full Text Available Objetivou-se, com este trabalho, avaliar a produção e as características químicas dos frutos da videira ‘Isabel’ sob aplicação de biofertilizantes líquidos. O experimento foi realizado, em condições de campo, no Centro de Ciências Humanas e Agrárias da Universidade Estadual da Paraíba, localizado no município de Catolé do Rocha/PB. Estudou­-se 5 tipos de biofertilizante  e 8 doses (0; 0,35; 0,7; 1,05; 1,4; 1,75; 2,1e 2,45 L/aplicação na produção e qualidade da produção da videira “Isabel”. O delineamento experimental adotado foi de blocos casualizados com 40 tratamentos no esquema fatorial 5 x 8 com quatro repetições totalizando 160 plantas experimentais. O número de cachos por plantas aumentou com o incremento das doses de biofertilizantes B1, B2 e B5  até os limites ótimos de 1,28. 1,20 e 1,50 L/aplicação, havendo redução a partir desses valores; O número de cachos por planta diminuiu com o aumento das doses de biofertilizantes B1, B2 e B5 acima dos limites ótimos de biofertilizantes; número de cachos por plantas aumentou de forma linear com o incremento das doses de biofertilizantes B3 e B4, otimizando ao máximo com a dose de 2,45 L/aplicação; Os tipos e as doses de biofertilizantes não afetaram de forma significativa os sólidos solúveis totais (ºBrix, a acidez total titulável e a relação ºBrix/acidez total do fruto da videira Isabel. 

  15. EFEITO DE FONTES E DOSES DE NITROGÊNIO NA REAÇÃO DA CULTIVAR DE TRIGO BR 14 À Septoria nodorum

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    Eduardo Dânia Ugalde

    1993-04-01

    Full Text Available O experimento foi conduzido em casa de vegetação da UFSM no período de maio a outubro de 1989. Três plantas de trigo, cultivar BR 14, foram cultivadas em cada vaso (6 litros com Solo Podzólico Vermelho Amarelo (Unidade de Mapeamento São Pedro, com 70% da capacidade de campo, constituindo a unidade experimental. O delineamento experimental foi inteiramente casualizado, sendo que os tratamentos foram fontes e doses de N, e inoculação das plantas com Septoria nodorum, constituindo um trifatorial com três repetições. As fontes de nitrogênio utilizadas foram uréia e salitre do Chile nas doses de 30, 60, 90 e 120kg/ha de N, sendo parte aplicado na semeadura (30% e o restante (70% no estádio 2 (início do afilhamento da escala proposta por LARGE (1956. Os tratamentos que não foram inoculados com Septoria nodorum apresentaram maior percentagem de N no tecido, o que parece não ter sido afetado tanto com relação a fonte de nitrogênio nem quanto a dose utilizada. O teor de matéria seca, sendo consideradas plantas inoculadas e não inoculadas, não diferiu tanto para fontes como para doses de nitrogênio (kg/ha. A severidade da doença foi maior em plantas que receberam maiores doses de adubação nitrogenada.

  16. Avaliação da produção e qualidade de frutos de melancia sob diferentes doses de potássio em cobertura

    Directory of Open Access Journals (Sweden)

    Joel Carlos Alves Rodrigues

    2016-12-01

    Full Text Available O potássio desempenha várias funções na bioquímica e fisiologia das plantas, como nos processos de fotossíntese, transporte e armazenamento de assimilados. O objetivo do trabalho foi avaliar a produção e qualidade da melancia cv. ‘Crimson Select Plus’ em função de doses de potássio como cobertura. O delineamento experimental utilizado foi o de blocos ao acaso, com cinco tratamentos, quatro repetições e 20 plantas por parcela. Os tratamentos consistiram de cinco doses de potássio (0, 60, 120, 180 e 240 kg ha-1. A fonte de potássio utilizada foi o cloreto de potássio (60% de K2O, aplicado de forma parcelada em cobertura. Foram realizadas avaliações de produção e qualidade de frutos: diâmetro do fruto - DF (cm, comprimento de fruto - CF (cm, massa fresca - MF e seca do fruto - MS (kg fruto-1, espessura da polpa - EP (cm, espessura casca - EC (cm e produtividade – PRODU (t ha-1. Para avaliação de qualidade, foram realizadas as análises de sólidos solúveis - SS (ºbrix, pH, acidez titulável - AT e índice de maturação - IM (SS/AT. A espessura de casca, pH, acidez titulável e índice  de maturação não foi alterada pelas doses de potássio. A dose que apresentou melhores resultados para a cultura da melancia da cultivar “Crimson Select Plus” em cobertura foi de 209,39 kg de K2O ha-1

  17. Influência da dependência energética de dosímetros termoluminescentes na medida da dose na entrada da pele em procedimentos radiográficos Influence of thermoluminescent dosimeters energy dependence on the measurement of entrance skin dose in radiographic procedures

    Directory of Open Access Journals (Sweden)

    Mércia Liane de Oliveira

    2010-04-01

    Full Text Available OBJETIVO: O objetivo do presente trabalho foi avaliar a influência da dependência energética de materiais termoluminescentes na determinação da dose na entrada da pele de pacientes submetidos a exames radiográficos (radiologia geral, mamografia e radiologia odontológica. MATERIAIS E MÉTODOS: Três diferentes materiais termoluminescentes foram utilizados: LiF:Mg,Ti, LiF:Mg,Cu,P e CaSO4:Dy. Estes materiais foram expostos a fontes padronizadas de radiação X e gama, e a feixes clínicos de raios X. RESULTADOS: As curvas de calibração e de dependência energética foram obtidas. Todos os materiais apresentaram resposta linear em função do kerma no ar. Com relação à dependência energética, as amostras de CaSO4:Dy e LiF:Mg,Ti mostraram maior variação da resposta termoluminescente em função da energia efetiva do feixe de radiação. CONCLUSÃO: Os materiais testados mostraram desempenho adequado para a detecção da radiação X em feixes padronizados e clínicos. Embora as amostras de CaSO4:Dy e LiF:Mg,Ti apresentem dependência energética significativa no intervalo de energia considerado, este materiais podem ser utilizados para medição da dose de entrada na pele se fatores de correção apropriados forem utilizados.OBJECTIVE: This study was aimed at evaluating the influence of the energy dependence of thermoluminescent materials on the determination of entrance skin dose in patients submitted to conventional radiographic studies (general radiology, mammography and dental radiology. MATERIALS AND METHODS: Three different thermoluminescent materials were utilized: LiF:Mg,Ti, LiF:Mg,Cu,P and CaSO4:Dy. These materials were exposed to standardized sources of X and gamma radiation and clinical X-ray beams. RESULTS: Calibration and energy dependence curves were obtained. All the materials showed a linear response as a function of the air kerma. As far as energy dependence is concerned, the CaSO4:Dy and LiF:Mg,Ti samples showed the

  18. Evaluation of absorbed radiation dose in mammography using Monte Carlo simulation; Avaliacao da dose absorvida em mamografia usando simulacao Monte Carlo

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, Bruno L.; Tomal, Alessandra [Universidade Estadual de Campinas (UNICAMP), Campinas, SP (Brazil). Instituto de Fisica Gleb Wataghin

    2016-07-01

    Mammography is the main tool for breast cancer diagnosis, and it is based on the use of X-rays to obtain images. However, the glandular tissue present within the breast is highly sensitive to ionizing radiation, and therefore requires strict quality control in order to minimize the absorbed dose. The quantification of the absorbed dose in the breast tissue can be done by using Monte Carlo simulation, which allows a detailed study of the deposition of energy in different regions of the breast. Besides, the results obtained from the simulation can be associated with experimental data and provide values of dose interest, such as the dose deposited in glandular tissue. (author)

  19. Dose estimation in CT exams of the abdomen based on values of DLP; Estimativa da dose em exames de tomografia de abdome com base nos valores de DLP

    Energy Technology Data Exchange (ETDEWEB)

    Kikuti, C.F.; Medeiros, R.B.; Salvadori, P.S.; Costa, D.M.C; D' lppolito, G., E-mail: kikuticf@gmail.com, E-mail: rbitelli2011@gmail.com [Universidade Federal de Sao Paulo (UNIFESP), SP (Brazil). Coordenadoria de Fisica e Higiene das Radiacoes. Departamento de Diagnostico por Imagem

    2013-10-01

    One of the challenges of multidetector computerized tomography is to minimize the risk of ionizing radiation using optimized protocols since higher doses are necessary to obtain high image quality. It was also noted that, due to the geometry in image acquisition using MDCT becomes necessary to estimate dose values consistent with the hypothesis clinically and with the specificities of the tomographic equipment. The aim of this study was to estimate the doses in abdomen exams from the data recorded on the MDCT console and dimensions obtained from DICOM images of patients undergoing different clinical protocols. Were collected, from the image DICOM of 101 exams, values of the dose length product (DLP) provided by Philips Health Care - Brilliance 64 equipment console, in order to relate them with the dose values obtained by means of thermoluminescent dosimeters ( TLD ) of CasSo{sub 4}:Mn placed on the surface of a cylindrical simulator abdomen acrylic manufactured under the technical - operational conditions for a typical abdomen exam. From the data obtained, it was possible to find a factor of 1.16 ( 5 % ) indicating that the DLP values Brilliance 64 console underestimate the doses and this should be used with correction factor to estimate the total dose of the patient. (author)

  20. Avaliação da atividade "in vivo" da fosfatase ácida e do crescimento de progênies de pupunheira cultivadas em duas doses de nitrogênio e fósforo

    Directory of Open Access Journals (Sweden)

    M. L. A. Bovi

    1998-09-01

    Full Text Available O presente trabalho, realizado em janeiro de 1995, visou avaliar a atividade da enzima fosfatase ácida em folhas de quatro progênies de pupunheira (Bactris gasipaes Kunth, cultivadas em duas doses de nitrogênio e duas de fósforo. Para tanto, utilizou-se a porção média da segunda folha mais jovem de perfilhos de palmeiras com quatro anos de idade. As plantas analisadas representam parcelas submetidas a duas doses de nitrogênio (N1 = 0, N2 = 400 kg ha-1 ano-1 de N e duas doses de fósforo (P1 = 0, P2 = 200 kg ha-1 ano-1 de P2O5. A dose de potássio foi 200 kg ha-1 ano-1 de K2O. Análises dos elementos no solo e nas folhas foram efetuadas e correlações foram estimadas entre as características avaliadas e o crescimento e a produção de palmito dos quatro tratamentos. Foram observados valores médios de atividade da fosfatase ácida de 8,35; 4,58; 10,84, e 11,05 µmol h-1 g-1, para os tratamentos N2P2, N2P1, N1P2 e N1P1, respectivamente. Houve diferenças significativas de atividade entre doses de nitrogênio (10,95 e 6,47 µmol h-1 g-1, para N1 e N2, respectivamente e entre progênies (variando de 6,18 (G3 a 10,10 (G1 µmol h-1 g-1, indicando que esses dois fatores devem ser levados em conta em estudos dessa natureza. A atividade da fosfatase ácida apresentou correlação negativa com as características que avaliam o crescimento (biomassa aérea e radicular e a produção de palmito (peso e diâmetro das plantas estudadas, não se correlacionando com os teores de fósforo no solo ou no tecido foliar.

  1. Doses de fósforo e potássio no desenvolvimento da cultura de Crambe abyssinica

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    Lucia Helena Garófalo Chaves

    2016-04-01

    Full Text Available A cultura do crambe (Crambe abyssinica é uma alternativa para produção de biodisel recebendo este enfoque por sua rusticidade, precocidade, alto teor de óleo e adaptabilidade. Os nutrientes minerais possuem funções essenciais e específicas no metabolismo das plantas. A aplicação de fertilizantes minerais é feita para repor sua perda, pois a cada ciclo as plantas extraem nutrientes dos solos. O manejo adequado do uso de fertilizantes no cultivo do crambe é pouco conhecido, não havendo recomendações específicas para a adubação. Portanto, objetivou-se estudar os efeitos da adubação mineral relativa aos elementos fósforo e potássio, no crescimento e na produção do crambe. O experimento foi instalado em casa de vegetação, com delineamento inteiramente casualizado em esquema fatorial 4 x 4 + 1, com três repetições, totalizando 51 unidades experimentais. As doses de fósforo e potássio utilizadas foram 50; 75; 100 e 125 kg ha-1. Aos 60 dias após o semeio (DAS foram analisadas altura das plantas, diâmetro caulinar e número de ramificações. As plantas foram colhidas em fase de maturação aos 90 DAS, quando foram avaliadas a massa seca total das plantas, número de grãos por planta e massa de mil grãos. O crescimento e a produção do crambe, nestas condições, foram pouco influenciados pela aplicação de fósforo e potássio, provavelmente, porque a cultura foi prejudicada pela falta de adubação nitrogenada.Phosphorus and potassium doses in the development of Crambe abyssinica  cultureAbstract: Mineral nutrients have essential and specific roles in plant metabolism. The application of mineral fertilizers is made to replenish its loss, for every cycle of the plant extract soil nutrients. The crambe culture is an alternative for the production of biodiesel getting this approach for its rusticity, precocity, high oil content and adaptability. Proper management of fertilizer use in crambe cultivation is little known

  2. Produção da banana nanicão (musa sp. em função de tipos e doses de biofertilizantes

    Directory of Open Access Journals (Sweden)

    Fábio Itano dos S. Alves

    2014-04-01

    Full Text Available  O uso de biofertilizantes na fruticultura vem sendo estudado em diferentes regiões do Brasil, por serem consideradas fontes de nutrientes para as culturas de fácil acesso e de baixo custo. O trabalho teve como objetivo avaliar o crescimento vegetativo da bananeira (Musa sp. 'Nanica' submetida à aplicação via radicular de diferentes tipos e dosagens de biofertilizantes. O experimento foi conduzido, em condições de campo no Centro de Ciências Humanas e Agrárias (CCHA da Universidade Estadual da Paraíba (UEPB, Campus Catolé do Rocha. O delineamento experimental foi de blocos casualizados no esquema fatorial 5 x 10, sendo 5 tipos de biofertilizantes (B1 = Esterco bovino (EB; B2 = EB+ farinha de rocha (FR; B3 = EB + FR+ leguminosa (L; B4 = EB+FR+ cinza de madeira (C; e B5 = EB+FR +L+C e 10 doses (0; 0,3; 0,6; 0,9; 1,2; 1,5; 1,8; 2,1; 2,4 e 2,7 L planta-1 aplicação-1 com quatro repetições.Foramavaliado duranteo 1º e o 2º ciclodacultura, a altura da planta, o diâmetro do caule, o número de folhas ea área foliar unitária e total. Para as variáveis estudadas as dosagens de biofertilizantes não apresentaram efeitos significativos, porém os tipos de biofertilizantes foram significativos colaborando ao aumento da área foliar da planta.

  3. Fluxo difusivo de fósforo em função de doses e da umidade do solo Influence of phosphorus doses and soil moisture on diffusion flow

    Directory of Open Access Journals (Sweden)

    José P. V. da Costa

    2006-12-01

    Full Text Available A difusão é o mecanismo mais expressivo do transporte do fósforo no solo e depende de vários fatores, como o conteúdo volumétrico de água, a interação fósforo-colóide do solo, a distância da fonte às raízes, o teor e a temperatura do solo. Avaliaram-se os efeitos do conteúdo volumétrico de água e de doses de fósforo no seu fluxo difusivo no solo, em amostras da camada superficial de cinco solos. O experimento consistiu do arranjo fatorial 5 x 8 x 5, referente a cinco materiais de solo, oito níveis de umidade e cinco doses de fósforo, dispostos em blocos ao acaso, com quatro repetições. Como unidade experimental foram utilizados anéis de PVC com volume útil de 360 cm³, que serviram como câmara de difusão. Para avaliação do fluxo difusivo de fósforo nas amostras foram utilizadas lâminas de resina de troca aniônica (IONICS 204UZRA. Pelos resultados, constatou-se que o fluxo difusivo sofre influência da umidade do solo e das doses de fósforo aplicadas.The main phosphorus transport mechanism in the soil is diffusion, which is influenced by several soil factors, such as volumetric water content, phosphorus-colloid interaction, distance between source and roots, content and temperature. The effects of the soil water content and phosphorus doses on the diffusion flow into soil were assessed in samples from the superficial layers of five soils. The treatments were arranged in a 5 x 8 x 5 factorial design corresponding, respectively, to five soils, eight moisture levels and five phosphorus doses. A completely randomized block design with four replications was used. The experimental unit was a PVC ring with a volume of 360 cm³, which acted as a diffusion chamber. Anionic exchange resin slides (IONICS 204UZRA were utilized to assess the phosphorus diffusion flow. Results indicated that the diffusion flow was influenced by phosphorus doses and moisture content.

  4. Evaluation of homogeneity and dose conformity in IMRT planning in prostate radiotherapy; Avaliacao da homogeneidade e conformidade de dose em planejamentos de IMRT de prostata em radioterapia

    Energy Technology Data Exchange (ETDEWEB)

    Lopes, Juliane S.; Leidens, Matheus; Estacio, Daniela R., E-mail: juliane.lopes@pucrs.br [Hospital Sao Lucas (PUC-RS), Porto Alegre, RS (Brazil). Servico de Radioterapia; Razera, Ricardo A.Z.; Streck, Elaine E.; Silva, Ana M.M. da [Pontificia Universidade Catolica do Rio Grande do Sul (PUC-RS), Porto Alegre, RS (Brazil). Faculdade de Fisica

    2015-12-15

    The goal of this study was to evaluate the dose distribution homogeneity and conformity of radiation therapy plans of prostate cancer using IMRT. Data from 34 treatment plans of Hospital Sao Lucas of PUCRS, where those plans were executed, were retrospectively analyzed. All of them were done with 6MV X-rays from a linear accelerator CLINAC IX, and the prescription doses varied between 60 and 74 Gy. Analyses showing the homogeneity and conformity indices for the dose distribution of those plans were made. During these analyses, some comparisons with the traditional radiation therapy planning technic, the 3D-CRT, were discussed. The results showed that there is no correlation between the prescribed dose and the homogeneity and conformity indices, indicating that IMRT works very well even for higher doses. Furthermore, a comparison between the results obtained and the recommendations of ICRU 83 was carried out. It has also been observed that the indices were really close to the ideal values. 82.4% of the cases showed a difference below 5% of the ideal value for the index of conformity, and 88.2% showed a difference below 10% for the homogeneity index. Concluding, it is possible to confirm the quality of the analyzed radiation therapy plans of prostate cancer using IMRT. (author)

  5. Dose evaluation in medical staff during diagnostics procedures in interventional radiology; Avaliacao da dose na equipe medica durante procedimentos diagnoticos de radiologia intervencionista

    Energy Technology Data Exchange (ETDEWEB)

    Bacchim Neto, Fernando A.; Alves, Allan F.F.; Rosa, Maria E.D.; Miranda, Jose R.A. [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Botucatu, SP (Brazil). Instituto de Biociencias. Departamento de Fisica e Biofisica; Moura, Regina [Faculdade de Medicina de Botucatu, SP (Brazil). Departamento de Cirurgia e Ortopedia; Pina, Diana R., E-mail: bacchim@ibb.unesp.br [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Botucatu, SP (Brazil). Faculdade de Medicina. Departamento de Doencas Tropicais e Diagnostico por Imagem

    2014-08-15

    Studies show that personal dosimeters may underestimate the dose values in interventional physicians, especially in extremities and crystalline. The objective of this work was to study the radiation exposure levels of medical staff in diagnostic interventional radiology procedures. For this purpose LiF:Mg,Ti (TLD-100) dosimeters were placed in different regions of the physician body. When comparing with reference dose levels, the maximum numbers of annual procedures were found. This information is essential to ensure the radiological protection of those professionals. (author)

  6. Uncertainties associated to the using of alanine/EPR for the dose interval in the radiotherapy; Incertezas associadas na utilizacao da alanina/RPE para o intervalo de dose da radioterapia

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues Junior, O.; Campos, L. L. [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2004-07-01

    The High Doses Laboratory of IPEN is developing a dosimetric system for high doses based on Electron Paramagnetic Resonance (EPR) of free radical radiation induced on alanine. The objective of this work is to present the efforts towards to improve the measure accuracy for doses in the range between 1-10 Gy. This system could be used as reference by radiotherapy services, as much in the quality control of the equipment, as for routine accompaniment of more complex handling where the total doses can reach some grays. The main problem for routine implantation is the calibration and the traceability of the system and many errors sources affects the accuracy of the measurements. In this work are discussed same aspects related on the uncertainty evaluation associated with high dose measurement using alanine and EPR. (author)

  7. Criteria for calculation of effective dose from the individual monitoring; Criterios para calculo de dose efetiva a partir da monitoracao individual

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2005-11-15

    This Regulation refers to the requirements of the Regulation CNEN-NN.3.01. 'Basic Act of Radiological Protection', as expressed in the section 5.9, and its application to the effective dose calculation for individual occupationally exposed. from the internal and external individual monitoring data

  8. Study of dose distribution in dental radiology using the Monte Carlo Simulation; Estudo da distribuicao de dose em radiologia odontologica usando simulacao Monte Carlo

    Energy Technology Data Exchange (ETDEWEB)

    Bonzoumet, S P.J.; Braz, D; Lopes, R T [Nuclear Instrumentation Laboratory, COPPE/UFRJ, Rio de Janeiro (Brazil); Anjos, M J [Nuclear Instrumentation Laboratory, COPPE/UFRJ, Rio de Janeiro (Brazil); Universidade do Estado do Rio de Janeiro, Rio de Janeiro (Brazil). Instituto de Fisica; Barroso, R C.S. [Universidade do Estado do Rio de Janeiro, Rio de Janeiro (Brazil). Instituto de Fisica

    2003-11-15

    Full text: The purpose of this study was to study the absorbed dose in mouth due to scattering in teeth in dental radiography using the monte carlo simulation. The Electron Gamma Shower (EGS-4) system of computer codes was used, which is a general purpose package for monte carlo simulation of the coupled transport of electrons and photons in an arbitrary geometry for particles with energies above a few keV up to several TeV. In the case of a X ray dental the low energy photons beam, are removed of the spectrum by the filtration. These low energy photons beam do not contribute in the obtaining of the radiographic image, but they will be contribute in the dose to the patient, however when the incident radiation crosses the tooth it generates a scattering radiation that contributes in the dose received by the patient in the oral cavity (cheek, tooth and oral cavity). Dental radiography is one of the largest single groups of radiographic examination accounting for 32% of radiographs taken in the Brazil. A number of relatively recent improvements in technology, equipment and techniques have the potential to reduce patient radiation dose and improve image quality. To optimize radiation protection all reasonable means should be employed to minimize the dose of each exposure. Dentists therefore need to keep up to date with changes in techniques and equipment and modify their own practice. In preliminary analysis could be notice that the energy below the 30 keV (low energy) is deposited in the cheek. To 30 keV photons there is the maximum absorbed energy in the tooth (about 60%). In 40 keV could be notice that deposited energy is same to teeth and cheek, but up to 40 keV just a small part of energy is deposited, e.g., the great part of energy is transmitted to the inner mouth (oral cavity). (orig.)

  9. Metrological aspects in estimating of radiation dose in patients of nuclear medicine; Aspectos metrologicos na estimativa da dose efetiva de pacientes em medicina nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Ruzzarin, Anelise

    2015-06-01

    In order to investigate the performance of routine measurements in nuclear medicine services, LNMRI/IRD has been conducting, since 1998, a comparison program of activity measurements of radiopharmaceuticals administered to patients in nuclear medicine. Correction factors are determined from the result of performance analysis in order to determine with better accuracy the activity to be administered to the patients. The present study shows how the correction factor is determined by the ratio between the measurement of the activity at the nuclear medicine center and the activity determined by the LNMRI, which is adopted as reference. It is essential that the dose calibrator be calibrated with standards traceable to national metrology laboratories, so that the activity administered to the patient is neither greater nor smaller than the appropriate value. The corrected values of the activities can be used to calculate with greater accuracy the effective doses received by the patients as well as the risk of cancer. Information related to radiopharmaceuticals and administered activities, type of exams and patient data of three Brazilian hospitals were collected for 1496 adults and 134 children submitted to diagnostic exams employing {sup 99m}Tc and {sup 131}I. Results showed up to a considerable difference between the administered activity and the corrected activity until 30% and 13% above the reference value, respectively, for the {sup 131}I and {sup 99m}Tc was detected. The consequences of these differences were not very critical in this study since the activity measured in dose calibrator before administration was lower than the corrected activity, thus causing a lower effective dose in patients. However, this reduction in activity may result in problems in obtaining the image and consequently, failure diagnosis, delaying correct diagnosis. On the other hand, the overestimation would be worse, mainly in therapeutic applications, because an unnecessarily high absorbed

  10. Procedures, activities and doses in nuclear medicine cycle in Brazil; Procedimentos, atividades e doses no ciclo da medicina nuclear no Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Silvia Maria Velasques de

    2005-07-01

    With the aim of characterizing nuclear medicine procedures performed in Brazil, activities of radiopharmaceuticals used and effective doses to patients, data was collected from nuclear medicine institutions in three regions of the country, namely the Southeast, the Northeast and the South regions, representing public hospitals, university hospitals, private and philanthropic institutions with low, medium and high levels of consumption of radiopharmaceuticals. The three chosen regions are responsible for 92% of radiopharmaceutical consumption and imaging equipment in the country. Accordingly, it was requested of some participating institutions to fulfill manually from individual patients data, to record gender, age, weight, height and activities used, for each type of exam as well as the equipment used. In others, the researcher collected data personally. Per institution, nuclear medicine diagnostic procedures ranged from 700 to 13,000 per year, most of which are myocardial and bone imaging procedures, and imaging equipment ranged, from 1 to 8 machines, one or two head SPECT's (hybrid or not). 26.782 patients protocols were analysed, 24.371 adults and 2.411 children and teenagers. For adult patients, differences were observed in the amount of activities used in diagnostic procedures between public and private institutions, with lower average activities used in public institutions. Activities administered to children and their effective doses were difficult to evaluate due to the incompleteness of individual records. Appropriate individual patient records could be adopted without affecting hospitals routine and contributing for a comprehensive evaluation of the radiation protection of nuclear medicine patients. Data from 8.881 workers were analysed, 346 working at nuclear medicine institutions. For monitored workers and measurably exposed workers in nuclear medicine, the values 2.3 mSv and 5.4 mSv, respectively, for effective annual doses are greater than data

  11. Monitoring and studies of environmental cumulative dose of Guangdong Da Ya Bay nuclear-power station by thermoluminescent dosimetry

    International Nuclear Information System (INIS)

    Wan Yusong; Li Shili; Yang Lin; Feng Zhanglin; Kong Lingfeng; Yu Jinglan

    1999-01-01

    The author presents the environmental γ radiation routine monitoring by TLD in Guangdong Da Ya Bay Nuclear Power Station and its peripheral 50 km area, which has been put into commercial operation since 1994. The year's monitoring result indicates that there is no obvious change of the total environmental γ radiation in Da Ya Bay Nuclear Power Station and its peripheral 50 km area. But the influence of gas release γ radiation was monitored in 1995 at the monitoring points in the area of 0∼1 km from the nuclear power station

  12. Evaluation of average glandular dose in digital and conventional systems of the mammography; Avaliacao da dose glandular media em sistemas digitais e convencionais de mamografia

    Energy Technology Data Exchange (ETDEWEB)

    Xavier, Aline C.S.; Barros, Vinicius S.M.; Khoury, Hellen J., E-mail: alinecx90@gmail.com, E-mail: vsmdbarros@gmail.com, E-mail: hjkhoury@gmail.com [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Dept. de Energia Nuclear; Mello, Francisca A. de, E-mail: francissamello@yahoo.com.br [Hospital das Clinicas do Recife (HCR/UFPE), PE (Brazil)

    2014-07-01

    Mammography is currently the most effective method of diagnosis and detection of breast pathologies. The main interest in this kid of exam comes from the high incidence rate of breast cancer and necessity of high quality images for accurate diagnosis. Digital mammography systems have several advantages compared to conventional systems, however the use of digital imaging systems is not always integrated to an image acquisition protocol. Therefore, it is questionable if digital systems truly reduce the dose received by the patient, because many times is introduced in the clinics without optimization of the image acquisition protocols. The aim of this study is to estimate the value of incident air Kerma and average glandular dose (AGD) in patients undergoing conventional and digital mammography systems in Recife. This study was conducted with 650 patients in three hospitals. The value of incident air Kerma was estimated from the measurement of the yield of equipment and irradiation parameters used for each patient. From these results and using the methodology proposed by Dance et al. the value of the average glandular dose was calculated. The results obtained show that the lowest value of AGD was found with conventional screen-film system, indicating that the parameters for image acquisition with digital systems are not optimized. It was also observed that the institutions with digital systems use lower breast compression values than the conventional. (author)

  13. Eficácia da dose reduzida de gonadorelina e diferentes prostaglandinas no protocolo ovsynch em vacas holandesas Efficacy of decreasing dose of gonadorelin and comparison between different prostaglandins on ovsynch protocol in lactating Holstein cows

    Directory of Open Access Journals (Sweden)

    R.M. Santos

    2008-12-01

    Full Text Available Avaliou-se a eficácia da dose de 0,10 ou de 0,25mg de gonadorelina nas taxas de ovulação e de sincronização no protocolo Ovsynch e de 150mcg de D-cloprostenol ou 0,530mg de cloprostenol sódico na regressão do corpo lúteo (CL de sete dias e de todos os CL. Foram utilizadas 136 vacas lactantes da raça Holandesa, com média de produção de leite de 23,75,8kg/dia, com 138,4±72,0 dias em lactação. As vacas foram distribuídas aleatoriamente em quatro grupos, de acordo com a dose de gonadorelina e o tipo da prostaglandina. As taxas de ovulação e de sincronização foram de 52,9% e 80,9% para 0,10mg de gonadorelina e de 57,4% e 80,9% para 0,25mg de gonadorelina, respectivamente. A taxa de regressão do CL de sete dias foi de 97,1% para o D-cloprostenol e de 97,5% para o cloprostenol sódico. A taxa de prenhez não foi influenciada pelos tratamentos, mas foi influenciada pela taxa de ovulação à primeira aplicação de gonadorelina, 16,0% vs. 6,6% para as vacas que ovularam e não ovularam, respectivamente. Conclui-se que 0,10mg de gonadorelina foi eficiente e ambas prostaglandinas podem ser usadas em protocolos de sincronização da ovulação.The efficacy of 150mcg D-cloprostenol or 0.530mg cloprostenol sodium on the 7- day corpus luteum (CL regression rate, and of two doses of gonadorelin, 0.10mg vs. 0.25mg, on the ovulation and synchronization rates during the Ovsynch protocol were evaluated. Lactating Holstein cows (n=136, producing 23.75.8kg milk/d and 138.4±72.0 days in milk were randomly assigned to four groups, according to dose of gonadorelin and prostaglandin type. No effect of the products and doses tested on conception rate were observed. The ovulation and synchronization rates using 0.10mg or 0.25mg of gonadorelin were 52.9% and 80.9% vs. 57.4% and 80.9%, respectively. The CL regression rates in cows ovulating after the first GnRH using D-cloprostenol or cloprostenol sodium were 97.1% and 97.5%, respectively. The

  14. Evaluation of absorbed radiation dose rate in a didactic X-ray equipment; Avaliacao da taxa de dose absorvida em um equipamento de raios-X didatico

    Energy Technology Data Exchange (ETDEWEB)

    Costa, Phelipe Amaral Ferreira; Perini, Ana Paula; Neves, Lucio Pereira, E-mail: lucio.neves@ufu.br [Universidade Federal de Uberlandia (UFU), MG (Brazil). Instituto de Fisica

    2016-07-01

    This work was performed in order to create a new didactic experiment in the X-ray apparatus of PHYWE, where the saturation current was obtained through a free air ionization chamber. The values of saturation currents were obtained in two ways. Initially, the anodic DDP was kept constant and the anodic current was varied. In the second way, the anodic current was kept constant while the anodic DDP was varied. Therefore, we were able to evaluate the dependence of the absolved dose rate in relation to the DDP and the tube current. (author)

  15. EFEITO DO TEOR DE GORDURA, VÁCUO E DOSE DE RADIAÇÃO GAMA NA SOBREVIVÊNCIA DE Salmonella TYPHIMURIUM ATCC 14028 EM CARNE BOVINA MOÍDA RESFRIADA

    Directory of Open Access Journals (Sweden)

    C. S. COSTA

    2008-09-01

    Full Text Available

    O trabalho avaliou a sobrevivência de Salmonella Typhimurium ATCC 14028 em carnes bovinas, moída crua e resfriada (2 ºC, através do tratamento com radiação gama (Co60, utilizando doses de 0; 1,5; 2,5 e 3,5 kGy. Além do fator dose de radiação foram avaliadas as influências do emprego de vácuo e de dois teores de gordura da carne bovina moída: baixo (2-4% e alto (11-13%, bem como a interação dos fatores, na redução ou eliminação da bactéria patogênica inoculada. Os resultados demonstraram que os teores de gordura da carne e o emprego de vácuo não influenciaram significativamente a sobrevivência da Salmonella. A dose de radiação gama influenciou a inativação de Salmonella de forma dose dependente até 2,5 kGy, com reduções de 4 ciclos logarítmicos. A dose de 2,5 kGy é suficiente para exercer um controle efetivo de Salmonella em carne bovina moída independentemente do seu teor de gordura e da presença de oxigênio.

  16. Treatment of trigeminal neuralgia with low doses of topiramate Tratamento da neuralgia do trigêmeo com baixas doses de topiramato

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    Renan Barros Domingues

    2007-09-01

    Full Text Available Topiramate was administered to eight patients with classical trigeminal neuralgia with or without previous symptomatic therapy with other antiepileptic drugs. The topiramate doses ranged from 50 to 100 mg a day, according to the clinical response and the reported side effects. Three patients had complete symptoms remission, three reported moderate improvement, and the treatment was not effective in two. The most frequently registered side effects were dizziness, somnolence and weight loss. Topiramate can be considered an alternative treatment for patients with trigeminal neuralgia.Oito pacientes com neuralgia do trigêmeo, com ou sem tratamentos prévios com anticonvulsivantes, foram submetidos a tratamento com topiramato. As doses de topiramato variaram de 50 a 100 mg ao dia, de acordo com a resposta clínica e com os efeitos colaterais relatados. Três pacientes obtiveram remissão completa, três relataram melhora parcial e o tratamento com topiramato foi ineficaz em dois pacientes. Os efeitos colaterais mais frequentemente citados foram tontura, sonolência e perda de peso. O topiramato pode ser considerado uma alternativa potencialmente eficaz para o tratamento de pacientes com neuralgia do trigêmeo.

  17. Effect of nitrogen doses on disease severity and watermelon yield Influência de doses de nitrogênio na severidade de doenças e na produtividade da melancia

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    Gil R dos Santos

    2009-09-01

    Full Text Available Nitrogen fertilization is an important step for watermelon (Citrullus lanatus production due to its influence over yield, fruit quality, and disease severity. Currently, the gummy stem blight (Didymella bryoniae and the downy mildew (Pseudoperonospora cubensis can be taken as the most important watermelon diseases, since they impose severe impairment to the crop. Furthermore, studies focusing on plant responses to nitrogen fertilization regarding fruit yield and quality, and disease resistance are rare. Hence, the present study aimed at evaluating the effect of nitrogen doses on fruit yield and quality, and on disease prevalence in watermelon. Two experiments were carried out at the Universidade Federal de Tocantins, employing sprinkler irrigation, in an area previously used to grow watermelon. The experimental design was blocks at random, with five treatments (N doses, applied twice as side-dressing, in kg ha-1, as follows: T1= control treatment without N, T2= 20, T3= 40, T4= 80, and T5= 120, and four replications. Urea (45% N was used as the N source. In the first assay, the highest fruit yield and average weight were observed when 40 kg ha-1 of N were applied. The highest severity of the gummy stem blight was observed when the highest nitrogen doses were applied (80 and 120 kg ha-1. In the second assay, the highest severity levels of the gummy stem blight, as well as of mildew, were observed again when N doses were the highest (80 and 120 kg ha-1. The lowest severity levels for both diseases were observed in the control treatment.A adubação nitrogenada é importante para a cultura da melancia (Citrullus lanatus por afetar diretamente a produtividade, a qualidade dos frutos e a severidade de doenças. Atualmente, o crestamento gomoso (Didymella bryoniae e o míldio (Pseudoperonospora cubensis podem ser consideradas as doenças mais importantes da melancia devido aos prejuízos que podem causar na lavoura. Estudos envolvendo a aplicação de

  18. Crescimento e marcha de absorção de nutrientes da melancieira fertirrigada com diferentes doses de N e K

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    Fabiola Pascoal de Nogueira

    2014-07-01

    Full Text Available 800x600 Na cultura da melancia, a nutrição mineral é um dos fatores mais importante que contribui diretamente na produtividade e qualidade dos frutos. O nitrogênio e o potássio são os dois nutrientes mais exigidos, e deve ser aplicado de acordo com as exigências de cada cultivar.O trabalho teve como objetivo avaliar o crescimento e a marcha de absorção de cultivares de melancia sob diferentes doses de nitrogênio e potássio. O experimento, com as duas variedades de melancia, foi conduzido no delineamento experimental em blocos casualizados no esquema de parcelas subdivididas 13 x 2, sendo o primeiro fator representado pela combinação de doses de nitrogênio (N e potássio (K em arranjo definido segundo o modelo: 2 x 2k+ 2k + 1, sendo k o número de fatores estudados (N e K.  Os totais de N, P e K acumulados no tecido vegetal não variaram com as doses de N ou K aplicadas em fertirrigação.Os máximos valores acumulados de N total foram aos 62 (10,9 g planta-1 e 61 DAT (13,31 g planta-1, para as cultivares Quetzali e Leopard. Para P total o valor máximo ocorreu aos 57 DAT (1,88 g planta-1 e para o K aos 64 DAT (15,15 g planta-1, independentes da cultivar. Normal 0 21 false false false PT-BR X-NONE X-NONE

  19. Evaluation of the dose absorbed by the thyroid of patients undergoing treatment of Graves disease;Avaliacao da dose absorvida pela tireoide de pacientes submetidos ao tratamento da doenca de Graves

    Energy Technology Data Exchange (ETDEWEB)

    Costa, Tiago L.; Filho, Joao A. [Universidade Catolica de Pernambuco (UNICAP), Recife, PE (Brazil). Dept. de Fisica; Silva, Jose M.F. da [Universidade Federal de Pernambuco (DEN/UFPE), Recife, PE (Brazil). Dept. de Energia Nuclear

    2009-07-01

    The radioiodine is used as complementary treatment of thyroid cancer and as first choice for the treatment of Graves' disease, being efficient, safe and easy administration, but without there is a protocol defined. This work was evaluated the thyroid absorbed dose from its mass and maximum uptake of I-131 obtained in the examination of diagnostic radiology of radiotherapeutic patients undergoing treatment of Graves' disease. Based on the results, it is observed that the thyroid absorbed dose, as much in terms of mass as the maximum uptake of I-131 for different values of administered activity, varies significantly. The analysis of these parameters is an excellent indicator for the pre-define quantity of radionuclide that is administered to the patient in terms of the radiation dose required to achieve an efficient therapeutic treatment. Moreover, it was observed that the thyroid absorbed dose depends on the degree of pathology of the disease, its mass and of the maximum uptake of I-131. (author)

  20. Evaluation of radiological protection and dose of skin entrance in paediatric dentistry examinations; Avaliacao da protecao radiologica e da dose de entrada na pele em exames de odontologia pediatrica

    Energy Technology Data Exchange (ETDEWEB)

    Khoury, Helen Jamil [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Dept. de Energia Nuclear; Vasconcelos, Flavia Maria Nassar de [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil); Silveira, Marcia Maria Fonseca da [Universidade de Pernambuco (UPE), Recife, PE (Brazil). Fac. de Odontologia; Couto, Geraldo Bosco Lindoso [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Fac. de Odontopediatria; Brasileiro, Izabela Vanderley

    2005-07-01

    In this work the radiological protection conditions and dose at the entrance of pediatric patients undergoing dental intraoral radiographs were evaluated. The study was conducted in two clinics of the dentistry course at the Federal University of Pernambuco, Recife, PB, Brazil, equipped with conventional X-ray apparatus, with 60 and 70 kV. 254 exams of 113 patients between the ages of 3 to 12 years were evaluated. The skin entrance dose was estimated using TLD-100 thermoluminescent dosemeters. During the examination were also recorded information regarding the time of exposure, radiographic technique used, use of thyroid protectors and lead apron, angle and distance of the cone Locator to the patient's skin. The results showed that the input skin doses ranged from 0.3 mGy to 10mGy. The lead apron was used in 71% of exams while the thyroid shield was only used in 58% of the exams. The exposure times ranged from 0,5s to 1,5s. From the results it can be concluded that the radiological procedures are not optimized and that in some cases the patient dose is high.

  1. Granulometric determinations and inhalation dose assessment for atmospheric aerosol contaminated by {sup 137}Cs; Determinazioni granulometriche e valutazioni di dose da inalazione per aerosol atmosferico contaminato da {sup 137}CS

    Energy Technology Data Exchange (ETDEWEB)

    Castellani, C.M.; Luciani, A. [ENEA, Centro Ricerche `E. Clementel`, Bologna (Italy). Dip. Ambiente; Oliviero, L.; Donato, R. [ENEA, Centro Ricerche Saluggia, Vercelli (Italy). Dip. Ambiente

    1996-07-01

    During the redevelopment of Brescia freight-yard a measurement campaign of atmospheric aerosol was carried out: in fact a {sup 137}Cs ground contamination, caused by the permanence of wagons carrying iron materials contaminated by this radionuclide, had been found out. During the redevelopment phases of excavation and can filling the workers were exposed to the danger of radioactive aerosol inhalation. The aim of the measurement campaign was to test the aerosol sampling and granulometric analysis methodologies with their sensitivity related to the inhalation dose assessments. The results of both aerosuspended mass and activity, evaluated by means of a portable cascade impactor, are presented. The granulometries have been interpolated with a log normal distribution using an iterative routine minimizing the square deviation between the calculated and experimental data. The results related to the dose assessments are also presented. These evaluations have been carried out using both the granulometric information obtained and the more recent models (ICRP 66) both the total concentration data and the dose coefficients referring to the standard conditions of ICRP 68 and of the Italian law (D.Lgs. 230/95). Furthermore the significance and the reliability of the dose assessments referring to the different methodologies are discussed, also in relation to the possibility of using this sampling methodologies for other radionuclides and different exposure conditions.

  2. Interferência do intervalo de administração da droga sobre a nefrotoxicidade da gentamicina em ratos Influence of the dose regimen on the gentamicin nephrotoxicity in rats

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    Verônica Cunha Rodrigues Oliveira

    2001-06-01

    Full Text Available A insuficiência renal aguda (IRA que apresenta índice de mortalidade em torno de 50%, pode ser definida como um abrupto declínio da filtração glomerular, resultante de isquemia ou toxicidade. A nefrotoxicidade por drogas é uma das etiologias mais freqüentes (27% e sugere-se que o intervalo de administração da droga pode interferir neste efeito colateral, entretanto o melhor regime de administração ainda não está bem estabelecido. Este conhecimento proporcionaria uma atuação mais direcionada de enfermagem na prevenção desta IRA hospitalar. Os resultados obtidos nesta pesquisa, indicam que a infusão única de gentamicina determina menor nefrotoxicidade, provavelmente devido à redução da sua concentração plasmática nas 24hs, diminuindo o acúmulo intracelular deste fármaco, um dos principais mecanismos celulares deste tipo de lesão. Este regime de tratamento mostra portanto vantagens quanto ao custo, efeito nefrotóxico e segurança quanto à eficácia terapêutica.The acute renal failure (ARF, that still presents a righ mortality rate (50% can be defined as an abrupt decline of the glomerular filtration, resultant of isquemic or toxicity event. The drugs nephrotoxicity is one of the most frequent cause (27% of ARF and it is suggested that the interval of administration of the drug can interfere in this side effect, however the best administration regimen is not very well established. This study evaluated the renal function of rats that received gentamicin (100mg/kg in one dose or in two doses (2x 50mg/kg,by intraperitoneal infusion. The results obtained in this research, indicated that the single infusion of gentamicin determined smaller nephrotoxicity by the reduction of serum concentration of this drug in 24 hours, decreasing the intracelular accumulation of this gentamicin, which is one of the main cellular mechanisms of this renal injury. The single dose treatment regime, otherwise, showes advantages not only related

  3. Fungicidas, doses e volumes de calda no controle químico da ferrugem da folha da aveia (Puccinia coronata f. sp. avenae Fungicides, rates and spray volumes in the chemical control of oats crown rust (Puccinia coronata f. sp. avenae

    Directory of Open Access Journals (Sweden)

    Ana R. de Oliveira

    2007-01-01

    Full Text Available A ferrugem da folha (Puccinia coronata f. sp. avenae é a doença mais destrutiva da aveia, e aplicações de fungicidas com volumes baixos de calda podem reduzir a eficácia do controle químico. O objetivo do trabalho foi avaliar a eficiência técnica e econômica de fungicidas, doses e volumes de calda no controle da ferrugem da folha da aveia. O experimento foi conduzido no ano de 2003, na área experimental da FAMV/UPF, com a cultivar de aveia UPFA-20. Os tratamentos foram compostos pelas combinações entre dois fungicidas (tebuconazole, Folicur, 0,75 L ha-1 e epoxiconazole + piraclostrobim, Opera, 0,5 L ha-1, quatro doses (40; 60; 80 e 100% da dose recomendada e dois volumes de calda (100 e 200 L ha-1. O delineamento experimental foi o de blocos casualizados, com esquema fatorial (2x4x2 e quatro repetições. Avaliaram-se a severidade, o controle da ferrugem, a massa do hectolitro, a massa de mil grãos e o rendimento de grãos, realizando-se análise econômica. O volume de calda de 200 L ha-1 proporcionou maiores níveis de controle da doença. As aplicações dos fungicidas com volume de 200 L ha-1 e meia dose ou com 100 L ha-1 e dose cheia proporcionam níveis de controle da ferrugem equivalentes. O resultado econômico difere entre fungicidas e independe do volume de calda. Os efeitos de doses dependem do fungicida.Crown rust (Puccinia coronata f. sp. avenae is the most important disease of oats in Brazil. In susceptible oat cultivars, fungicides are needed to control the disease efficiently. However, spray at low volumes may reduce fungicide performance significantly. A field experiment with the oat cultivar UPFA-20 was carried out at the FAMV/UPF to evaluate the influence of fungicides, rates, and spray volumes on the efficacy of the chemical control for crown rust. The tested treatments combined two fungicides (tebuconazole, Folicur, 0,75 L ha-1; epoxiconazole + pyraclostrobin, Opera, 0,5 L ha-1, four rates (40; 60; 80 and 100

  4. System for prediction and determination of the sub critic multiplication; Sistema para previsao e determinacao da multiplicacao subcritica

    Energy Technology Data Exchange (ETDEWEB)

    Martinez, Aquilino S.; Pereira, Valmir; Silva, Fernando C. da [Universidade Federal, Rio de Janeiro, RJ (Brazil). Inst. de Fisica

    1997-12-01

    It is presented a concept of a system which may be used to calculate and anticipate the subcritical multiplication of a PWR nuclear power plant. The system is divided into two different modules. The first module allows the theoretical prediction of the subcritical multiplication factor through the solution of the multigroup diffusion equation. The second module determines this factor based on the data acquired from the neutron detectors of a NPP external nuclear detection system. (author). 3 refs., 3 figs., 2 tabs.

  5. Produtividade da cultura da melancia em função de fontes e doses de potássio Yield of watermelon fruits as a function of sources and doses of potassium

    Directory of Open Access Journals (Sweden)

    Arthur Bernardes Cecílio Filho

    2004-06-01

    Full Text Available Foram conduzidos dois experimentos em propriedades rurais próximas à cidade de Borborema - SP, nos períodos de outubro a dezembro de 2001 e de fevereiro a abril de 2002, com o objetivo de avaliar a produtividade de melancia (Citrullus lanatus (Thumb. Matsum. & Nakai, híbrido Tide, em função de fontes e doses de potássio. O delineamento experimental utilizado foi o de blocos casualizados completos, em esquema fatorial 3 x 4, com três repetições, sendo utilizadas as fontes: cloreto KCl, nitrato (KNO3 e sulfato de potássio (K2SO4 e as doses: 50; 100; 200 e 300 kg de K2O ha-1. Foram avaliados o peso médio de fruto, o número de frutos e produção por planta e produtividade. O maior número de frutos por planta estimado foi obtido nas doses de 190 e 300 kg K2O ha-1, respectivamente, nas fontes KNO3 e KCl. Não houve diferença significativa entre as doses para K2SO4. Para o peso médio de fruto, houve diferença significativa entre as fontes apenas no cultivo de fevereiro a abril de 2002, quando o KCl proporcionou maior peso. A maior produção por planta foi obtida com K2SO4, seguido por KNO3 e KCl. Entretanto, as doses de potássio para as máximas produtividades foram de 132, 193 e 205 kg K2O ha-1, respectivamente, para as fontes K2SO4, KNO3 e KCl. O plantio de outubro a dezembro de 2001 proporcionou maior peso médio, produção de frutos por planta e produtividade, ao passo que o maior número de frutos por planta foi obtido no cultivo de fevereiro a abril de 2002.Two field experiments were conducted in Borborema, State of São Paulo, from periods of October to December of the 2001 and February to April of 2002, with the objective of evaluate the yield of watermelon (Tide hybrid (Citrullus lanatus (Thumb. Matsum. & Nakai in function of sources and doses of potassium. The experimental design was a randomized complete block, with three replications, in a 3 x 4 factorial scheme, being evaluated sources: potassium chloride, nitrate and

  6. Preliminary analysis of doses to evaluate the image quality in radiographic examinations in veterinary radiology;Analise preliminar das doses para avaliacao da qualidade da imagem em exames radiograficos na radiologia veterinaria

    Energy Technology Data Exchange (ETDEWEB)

    Pinto, Ana Carolina B.C.F.; Dias, Mayara T.P.; Santos, Andrea C. [Universidade de Sao Paulo (USP), SP (Brazil). Faculdade de Medicina Veterinaria e Zootecnia; Melo, Camila S.; Furquim, Tania A.C. [Universidade de Sao Paulo (IEE/USP), SP (Brazil). Inst. de Eletrotecnica e Energia

    2009-07-01

    This work has as objective to promote the analysis of the radiological doses and quality of the image of the technical letter used for the accomplishment of thorax and coxal radiographic examination of animals of canine and feline species. The study was accomplished in the service of Diagnosis for Image in Veterinarian Hospital of Veterinary Medicine and Zootecnia College of University of Sao Paulo, in two conventional equipment. Initially, physical features of the animals and the technique used were collected for each one of the 188 radiographic examinations of thorax and 52 examinations of coxal. The animals were placed in different groups, according to their body weight. For each group, the averages for each feature were calculated: thickness of the radiographed region, tension, electric current, time of exhibition, current product electric-time, size of the used film, presence or absence of bucky and feature of focus (narrow or thick). On the basis of the averages of group M (of lesser weights that 5kg for cats and between 10,1kg and 20kg for dogs), was executed a physical analysis of the current technical letter, using the equipment: ionization chamber (to determinate the value of kerma in air), simulator objects (representative of the thickness of the animal) and three dispositive standards of test that evaluate space resolution, resolution in low contrast and contrast-detail. The obtained images were analyzed and compared for a physicist and a radiologist medical veterinary. The results had shown that the examinations supply dose considered high for techniques used mainly for coxal. The equipment A, although to supply higher doses, presents the better images for the majority of the projections. However, the study indicates that there are not exactly reference levels, but these examinations must pass for improvement of quality of image (author)

  7. Study of the heterogeneity effects of lung in the evaluation of absorbed dose in radiotherapy; Estudo dos efeitos da heterogeneidade de pulmao na avaliacao da dose absorvida em radioterapia

    Energy Technology Data Exchange (ETDEWEB)

    Campos, Luciana Tourinho

    2006-02-15

    The main objective of radiotherapy is to deliver the highest possible dose to the tumour, in order to destroy it, reducing as much as possible the doses to healthy tissues adjacent to the target volume. Therefore, it is necessary to do a planning of the treatment. The more complex is the treatment, the more difficult the planning will be, demanding computation sophisticated methods in its execution, in order to consider the heterogeneities present in the human body. Additionally, with the appearing of new radiotherapeutic techniques, that used irradiation fields of small area, for instance, the intensity modulated radiotherapy, the difficulties for the execution of a reliable treatment planning, became still larger. In this work it was studied the influence of the lung heterogeneity in the planning of the curves of percentage depth dose, PDP, obtained with the Eclipse{sup R} planning system for different sizes of irradiation fields, using the correction algorithms for heterogeneities available in the planning system: modified Batho, general Batho and equivalent tissue-air ratio. A thorax phantom, manufactured in acrylic, containing a region made of cork to simulate the lung tissue, was used. The PDP curves generated by the planning system were compared to those obtained by Monte Carlo simulation and with the use of thermoluminescent, TL, dosimetry. It was verified that the algorithms used by the Eclipse{sup R} system for the correction of heterogeneity effects are not able to generate correct results for PDP curves in the case of small fields, occurring differences of up to 100%, when the 1x1 cm{sup 2} treatment field is considered. These differences can cause a considerable subdosage in the lung tissue, reducing the possibility of the patient cure. (author)

  8. Análise da distribuição espacial de dose absorvida em próton terapia ocular Spatial distribution analysis of absorbed dose in ocular proton radiation therapy

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    Marília Tavares Christóvão

    2010-08-01

    Full Text Available OBJETIVO: Propõe-se avaliar os perfis de dose em profundidade e as distribuições espaciais de dose para protocolos de radioterapia ocular por prótons, a partir de simulações computacionais em código nuclear e modelo de olho discretizado em voxels. MATERIAIS E MÉTODOS: As ferramentas computacionais empregadas foram o código Geant4 (GEometry ANd Tracking Toolkit e o SISCODES (Sistema Computacional para Dosimetria em Radioterapia. O Geant4 é um pacote de software livre, utilizado para simular a passagem de partículas nucleares com carga elétrica através da matéria, pelo método de Monte Carlo. Foram executadas simulações computacionais reprodutivas de radioterapia por próton baseada em instalações pré-existentes. RESULTADOS: Os dados das simulações foram integrados ao modelo de olho através do código SISCODES, para geração das distribuições espaciais de doses. Perfis de dose em profundidade reproduzindo o pico de Bragg puro e modulado são apresentados. Importantes aspectos do planejamento radioterápico com prótons são abordados, como material absorvedor, modulação, dimensões do colimador, energia incidente do próton e produção de isodoses. CONCLUSÃO: Conclui-se que a terapia por prótons, quando adequadamente modulada e direcionada, pode reproduzir condições ideais de deposição de dose em neoplasias oculares.OBJECTIVE: The present study proposes the evaluation of the depth-dose profiles and the spatial distribution of radiation dose for ocular proton beam radiotherapy protocols, based on computer simulations in nuclear codes and an eye model discretized into voxels. MATERIALS AND METHODS: The employed computational tools were Geant4 (GEometry ANd Tracking Toolkit and SISCODES (Sistema Computacional para Dosimetria em Radioterapia - Computer System for Dosimetry in Radiotherapy. Geant4 is a toolkit for simulating the passage of particles through the matter, based on Monte Carlo method. Computer simulations

  9. Efeito da filtração adicional nas doses de radiação e na qualidade das imagens nos exames videofluoroscópicos Effect of additional filtration on radiation doses and image quality in videofluoroscopic studies

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    Milton Melciades Barbosa Costa

    2009-12-01

    Full Text Available OBJETIVO: Investigar o efeito da adição de filtros de alumínio (1 mm e cobre (0,4 mm na redução das doses efetivas de radiação e na qualidade das imagens em exames videofluoroscópicos. MATERIAIS E MÉTODOS: Ao tubo de raios X adicionou-se câmara de ionização conectada a um eletrômetro para medir o produto kerma-área, com técnica de 65 kVp e 0,7 mA, sem e com adição dos filtros. Foi medida resolução espacial, a de baixo contraste e tons de cinza, utilizando os objetos de teste de Leeds. Quinze voluntários tiveram o produto kerma-área/minuto do estudo faríngeo comparados, dez com filtração e base e cinco com adição dos filtros associados. RESULTADOS: A adição dos filtros separados ou associados produziu expressiva redução do produto kerma-área, com ganho na qualidade das imagens videofluoroscópicas determinado pela maior separação dos tons de cinza e aumento da relação brilho/contraste da curva de cinza. CONCLUSÃO: A interposição adicional de filtros de alumínio e cobre, em especial quando associados, melhora a qualidade das imagens, com expressiva redução das doses de radiação necessárias à sua geração.OBJECTIVE: The purpose of thys study was to investigate the effect of the addition of aluminum (1 mm and copper (0.4 mm filters on effective radiation doses and image quality in videofluoroscopy. MATERIALS AND METHODS: An ionization chamber coupled with an electrometer was added to x-ray tube to measure the kerma area product with 65 kV and 0.7 mA technique, without and with additional filtration. Low contrast, gray scale and spatial resolution were measured utilizing Leeds test objects. Fifteen volunteers underwent pharynx study, ten without and five with aluminum and cooper filters associated, and had the kerma area product/minute compared. RESULTS: The specified filters addition, either separated or associated, allowed an expressive decrease in kerma area product besides an actual improvement in the

  10. In vitro study of dose-response relationship of fluoride with dental enamel = Estudo in vitro da relação dose-resposta do fluoreto com esmalte dental

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    Arthur, Rodrigo Alex

    2007-01-01

    Full Text Available Modelos in vitro para avaliação da reatividade do fluoreto (F devem apresentar resposta dose-efeito. Dessa forma, o objetivo desse estudo foi avaliar a relação dose-resposta do fluoreto presente em solução aquosa com o esmalte dental bovino. Cento e vinte blocos de esmalte bovino (5 × 5 × 2 mm, 60 hígidos e 60 com lesão artificial de cárie, foram submetidos durante 10 minutos à água destilada e deionizada (controle negativo e soluções aquosas contendo 50, 100, 200 ou 400 µg F/mL. Cada grupo experimental recebeu 12 blocos hígidos e 12 blocos com lesão artificial de cárie. Duas camadas consecutivas de esmalte dental foram removidas de todos os blocos dentais por meio de ataque ácido e o fluoreto extraído foi determinado com eletrodo específico. Os resultados de fluoreto incorporado foram expressos em µg por g de esmalte removido, considerando a quantidade total das duas camadas. A incorporação de fluoreto pelo esmalte hígido mostrou uma relação dose-resposta linear (p = 0,0001, enquanto que os blocos com lesão de cárie mostraram relação polinomial quadrática (p < 0,0001. Os resultados sugerem que o modelo in vitro de reatividade empregado no presente estudo é apropriado para avaliar a relação doseresposta entre o fluoreto em solução aquosa e aquele incorporado pelo esmalte dental bovino hígido ou com lesão artificial de cárie

  11. Efeitos de algumas características do solo na resposta da planta a doses de herbicidas Effect of some soil characteristics on plant response to herbicide dosis

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    E. M. Paulo

    1991-01-01

    Full Text Available Foram estudados em casa de vegetação o tempo de sobre vivência de oito espécies olerícolas a aplicação de atrazina nas doses correspondentes a 1,8 e 3,2 kg/ha, e de diuron nas doses de 1,2 e 2,0 kg/ ha, em três tipos de solos ácidos tropicais. Os resultados mostraram alta correlação linear entre o tempo médio de vida das plântulas com teores de matéria orgânica, capacidade de troca catiônica (CTC efetiva e pH do solo; e baixas correlações com teores de argila mais silte. Os resultados indicam ser mais adequado tomar como base a característica CTC do solo em lugar da sua classificação textural para fins de recomendação das doses dos herbicidas.A study was conducted in green house to determine the survival time of eight vegetable plant species to soil application of 1,8 and 3,2 kg/ha of atrazine, and 1,2 and 2,0 kg/ha of diuron, in three tropical soils. High line ar correlation was obtained betwe en avera ge survi val time and organic matter content, cation exchange capacity (CEC and soil pH; and low correlation with clay or clay plus silt content. The results lead to the conclusion that it seems more consistent to consider CEC inste ad of soil texture on dosis recommendation fow both herbicides.

  12. Componentes da Produção de Forragem em Pastagens dos Capins Tanzânia e Mombaça Adubadas com Quatro Doses de NPK

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    Quadros Danilo Gusmão de

    2002-01-01

    Full Text Available O trabalho foi conduzido na FCAV-Unesp, em Jaboticabal-SP, para avaliar os efeitos de quatro doses combinadas de NPK sobre os componentes da produção e das perdas de matéria seca (MS em pastagens dos cultivares Tanzânia e Mombaça de Panicum maximum Jacq., manejadas com 28 dias de descanso e com altura média de 30 cm de resíduo pós-pastejo. As avaliações foram realizadas em parcelas de 96 m² segundo um fatorial 2 (cultivares x 4 (doses de NPK, em blocos completos ao acaso, com três repetições. As adubações estudadas corresponderam ao decréscimo em 30 % e aos acréscimos em 30 e 60 % de uma dose "padrão" com 145; 21,6 e 180 kg/ha de N, P2O5 e K2O, respectivamente (referente a 1,2; a 0,08; e a 1,2 % de N, P e K na MS, com produção estimada em 12000 kg/ha. A MS verde (MSV em pré-pastejo e no resíduo aumentou linearmente com a adubação, com maiores valores obtidos para o cv. Mombaça (9183 e 5227 kg/ha, respectivamente do que para o cv. Tanzânia (6275 e 3808 kg/ha, respectivamente. A participação de lâminas foliares na MSV em pré-pastejo foi menor no cv. Tanzânia (51 % do que no cv. Mombaça (54 %. A densidade de perfilhos não variou com a adubação. O aumento do peso de perfilho com a elevação das doses de NPK resultou em maiores produções de MSV. A MS senescida (média de 3108 kg/ha de MS não diferiu entre cultivares. De modo geral, quanto maior a dose de adubo aplicado, maiores foram a taxa de acúmulo diário de MSV e a MSV perdida por pisoteio. O cv. Mombaça apresentou maior potencial de resposta à adubação do que o cv. Tanzânia, com taxas de lotação de 6,2 e 4,0 UA/ha, respectivamente.

  13. Produção e qualidade da moranga híbrida em resposta a doses de nitrogênio Yield and quality of hybrid squash (pumpkin in response to nitrogen doses

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    Marinalva W Pedrosa

    2012-06-01

    Full Text Available Foram avaliados os efeitos de doses de N na produção e qualidade da moranga hibrida cv. Tetsukabuto (Takaima F1 em experimento na EPAMIG Centro Oeste, Prudente de Morais (MG, de 25/08 a 03/12/2008. Foram avaliadas cinco doses de nitrogênio (0; 37,5; 75; 150; 300 kg ha-1, na forma de uréia, divididas em quatro aplicações (30% no plantio, 20% aos 20 dias, 30% aos 40 dias e 20% aos 60 dias após a emergência, num delineamento experimental de blocos casualizados com quatro repetições. As doses de N influenciaram significativamente as características avaliadas. O número de frutos aumentou de 2.498 ao ponto de máximo de 6.794 frutos ha-1 com a aplicação de 219 kg ha-1 de N. O diâmetro e a espessura da polpa do fruto aumentaram de 14,97 e 2,33 cm, até atingirem os pontos máximos de 17,74 e 2,80 cm nas doses de 171 e 128 kg ha-1 de N, respectivamente. O teor de sólidos solúveis na polpa de frutos de moranga híbrida aumentou com o aumento das doses de N observando-se com a aplicação de 300 kg ha-1 de N teor de 8ºBrix. A produtividade de frutos foi também influenciada pelas doses de N estimando-se como valor máximo 11,55 t ha-1 de frutos com a aplicação de 300 kg ha-1 de N. A dose estimada de N relativa à máxima eficiência econômica foi obtida com a aplicação de 262 kg ha-1, considerando os preços de R$ 2,41 kg-1 de N e de R$ 560,00 t-1 de moranga.An experiment was carried out at EPAMIG Centro Oeste, Prudente de Morais, Minas Gerais state, Brazil, from August 25 to December 2, 2008, to evaluate the effects of N rates on production and quality of hybrid squash cv. Tetsukabuto (Takaima F1. The treatments were five N rates (0, 37.5, 75, 150, 300 kg ha-1, as urea, split in four applications (30% at planting date, 20% at 20 days, 30% at 40 days and 20% at 60 days after emergence in a randomized complete block design, with four replications. The N rates significantly affected the characteristics evaluated. The number of fruits

  14. Comparação da eficácia de doses iguais de acetaminofeno retal e oral em crianças Comparison of antipyretic effectiveness of equal doses of rectal and oral acetaminophen in children

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    Sedigha Akhavan Karbasi

    2010-06-01

    Full Text Available OBJETIVO: Comparar uma dose de acetaminofeno oral e retal e avaliar a aceitabilidade do acetaminofeno retal, uma vez que o acetaminofeno oral e retal é amplamente usado como agente antipirético em crianças com febre e a eficiência comparativa dessas duas preparações não está bem estabelecida. MÉTODOS: Neste estudo prospectivo de grupos paralelos, foram incluídas 60 crianças admitidas na emergência ou clínica ambulatorial pediátrica em um hospital terciário, com idade entre 6 meses e 6 anos e com temperatura retal acima de 39 °C. Os pacientes foram distribuídos aleatoriamente em dois grupos de mesmo tamanho. O grupo 1 recebeu 15 mg/kg de acetaminofeno retal, e o grupo 2 recebeu a mesma dose oralmente. A temperatura foi registrada no tempo zero e 1 e 3 horas após administração da droga. RESULTADOS: No primeiro grupo, a redução média de temperatura, 1 e 3 horas após administração do acetaminofeno, foi de 1,07±0,16 (p 0,05. CONCLUSÃO: As preparações oral e retal de acetaminofeno têm eficácia antipirética equivalente em crianças. A via retal mostrou ser tão aceitável quanto a oral entre os pais.OBJECTIVE: To compare a dose of oral and rectal acetaminophen and to evaluate acceptability of rectal acetaminophen, since oral and rectal acetaminophen is widely used as an antipyretic agent in febrile children and the comparative effectiveness of these two preparations is not well established. METHODS: In this prospective parallel group designed study, 60 children who presented to the emergency department or outpatient pediatric clinic at a tertiary hospital and aged from 6 months to 6 years with rectal temperature over 39 °C were enrolled. Patients were randomly assigned to two equal-sized groups. Group 1 received 15 mg/kg acetaminophen rectally and group 2 received the same dose orally. Temperature was recorded at baseline and 1 and 3 hours after drug administration. RESULTS: In the first group, mean decrease in

  15. CE e RAS do extrato de saturação do solo sob diferentes níveis de salinidade e doses de nitrogênio no cultivo da abobora

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    Max Venicius Teixeira da Silva

    2014-07-01

    Full Text Available 800x600 A agricultura irrigada depende tanto da quantidade como da qualidade da água; no entanto, o aspecto qualidade tem sido desprezado devido ao fato de que, no passado, em geral as fontes de água, eram abundantes, de boa qualidade. O trabalho teve como objetivo estudar a condutividade elétrica e razão de adsorção do sódio no extrato de saturação do solo no cultivo da abobora sob diferentes níveis salinos da água de irrigação e doses de nitrogênio. A água de irrigação disponível na Fazenda Experimental é proveniente de um poço perfurado do aqüífero Arenito Açu, com profundidade aproximada de 800 m, com água de boa qualidade, e condutividade elétrica da água (CEa em torno de0,5 dS m-1. Adotou-se o delineamento experimental em blocos ao acaso, em esquema de parcelas subdivididas 5 x 3, com quatro repetições. Os tratamentos foram constituídos dos cinco níveis de salinidade (0,5, 1,5, 2,5, 3,5 e 4,5 dS m-1, e três níveis de nitrogênio: N1 = 27,37; N2 = 91,25 e N3 = 155,12 kg ha-1 correspondente a 30%, 100% e 170%, da recomendação de nitrogênio. Houve um aumento da salinidade do extrato de saturação com incremento dos níveis salinos da água e adubação nitrogenada. Os maiores valores de CEes foram verificados na CE (4,5 dS.m-1 e 170% da dose  de nitrogênio recomendada pelos produtores de abobora. A razão de adsorção de Sódio (RASes cresceu proporcional com os valores da condutividade elétrica da água de irrigação Normal 0 21 false false false PT-BR X-NONE X-NONE

  16. Glandular dose and image quality control in mammography facilities with computerized radiography systems; Dose glandular e controle de qualidade da imagem em servicos de mamografia com sistema de radiografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Dantas, Marcelino Vicente de Almeida

    2010-07-01

    Breast cancer is the most common cancer among women, and early detection is critical to its diagnosis and treatment. To date, the most effective method for early detection of breast cancer has been x-ray mammography for which the screen/film (SF) technique has been the gold standard. However, even though SF combinations have been improved and optimized over the years for breast imaging, there are some critical limitations, including a narrow exposure range, image artifacts, film processing problems, and inflexibility in image processing and film management. In recent years, digital mammography has been introduced in cancer screening programmes with the screen/film techniques gradually being phased out. Computed radiography (CR), also commonly known as photostimulable phosphor (PSP) imaging or storage phosphor, employs reusable imaging plates and associated hardware and software to acquire and to display digital projection radiographs. In this work, a protocol model was tested for performing image quality control and average glandular dose (AGD) evaluation in 19 institutions with computed radiography systems for mammography. The protocol was validated through tests at the Laboratorio de Radioprotecao Aplicada a Mamografia (LARAM) from the Centro de Desenvolvimento da Tecnologia Nuclear (CDTN). The image quality visual evaluation of CDMAM phantom showed that 53% of the facilities were able to produce images of excellent quality. Furthermore, the automated evaluation of image quality, using the analyze software cdcom.exe, showed that 57% of the images were considered to be of good quality. The detector linearity test showed that the CR response is very linear, where 95% of facilities evaluated were considered to be compliant. For the image noise was found that only 20% of facilities are in agreement with the parameters established for this test. The average glandular doses, which patients may be getting to perform an examination, were below the action levels

  17. Minimal effective dose of phosphine to control the cashew root borer, Marshallius bondari Rosado-Neto (Coleoptera: Curculionidae Dose mínima efetiva de fosfina no controle da broca-da-raiz do cajueiro, Marshallius bondari Rosado-Neto (Coleoptera: Curculionidae

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    Ervino Bleicher

    2010-06-01

    Full Text Available The objective of this research was to determine, in field conditions, the minimal of phosphine effective dose for the cashew root borer control. Three experiments were set up at three different periods: August, October and November, 1994, to control the cashew root borer, Marshallius bondari Rosado-Neto (Coleoptera: Curculionidae, in Piaui State, Brazil. One, two, three and six phosphine tablets of three gram each, per plant were tested. In the August essay, phosphine was inefficient to control the borer. In the October essay, control was achieved using as little as 2 tablets per plant and in November with one tablet per plant to control the adult borers in the soil. Higher efficiency was achieved when treatment was applied far away from the last rain, in other words, as soil dries out.Objetivou-se determinar, em condições de campo, a dose mínima de fosfina para o controle da broca da raiz do cajueiro. Foram instalados 3 experimentos em épocas distintas, sendo o primeiro em agosto, o segundo em outubro e o terceiro em novembro de 1994 para o controle de Marshallius bondari Rosado-Neto (Coleoptera: Curculionidae em cajueiro, Anacardium occidentale L. no município de Pio IX, Estado do Piauí. Foram testadas 1; 2; 3 e 6 pastilhas de fosfina na forma de fosfeto de alumínio, de 3 gramas cada, por planta. No ensaio conduzido em agosto nenhum tratamento foi eficiente para o controle de brocas adultas no solo. No ensaio instalado em outubro, a fosfina foi eficiente a partir de duas pastilhas por planta e no ensaio de novembro a partir de uma pastilha por planta para o controle de adultos no solo. A eficiência foi tanto maior quanto maior foi o tempo decorrido após a última chuva, estando, portanto, o solo mais seco.

  18. In-situ gamma spectrometry method for determination of environmental gamma dose; Metodo de espectrometria gamma in situ para determinacao de dose gama ambiental

    Energy Technology Data Exchange (ETDEWEB)

    Conti, Claudio de Carvalho

    1995-07-15

    This work tries to establish a methodology for germanium detectors calibration, normally used for in situ gamma ray spectrometry, for determining the environmental exposure rate in function of the energy of the incident photons. For this purpose a computer code has been developed, based on the stripping method, for the computational spectra analysis to calculate the contribution of the partial absorption of the gamma rays (Compton effect) in the active and nonactive parts of the detector. The resulting total absorption spectrum is then converted to fluence distribution in function of the energy for the photons reaching the detector, which is then used to calculate the exposure rate or kerma in air. The unfolding and fluency convention parameters are determined by detector calibration using point gamma sources. The method is validated by comparison of the results against the calculated exposure rate at a point of interest for the standards. This method is used for the direct measurement of the exposure rate distribution in function of the energy at the site, in situ measurement technic, leading to rapid results during an emergency situation and also used for indoor measurements. (author)

  19. Determination of the crust thickness in the active margin of the Antarctic region; Determinacao da estrutura crustal na margem ativa da regiao antartica

    Energy Technology Data Exchange (ETDEWEB)

    Torres, Luiz Carlos; Gamboa, Luiz Antonio Pierantoni [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Lagemar; Gomes, Benedito Souza [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    1997-07-01

    Seismic multichannel, gravity and magnetometry measurements were carried out in the region of West coast of the Antarctic Peninsula, Bransfield Strait, South Shetland Islands and South Shetland Trench, by Brazilian Antarctic Program during the summers of 1987 and 1988. The present work, using a continue seismic and gravity and gravity data profile crossing the area, intends to present a two-dimensional model of the crust thickness in this region. By this model, the Moho discontinuity would lie at a depth of 14.5 km below the axis of the Bransfield trough. This anomalous behaviour in addition to compressional processes identified in the accretionary prism and trench, was interpreted as an evidence of the continued opening of the Bransfield basin. (author)

  20. Ulceração das placas psoriáticas - efeito cutâneo adverso do metotrexato em altas doses no tratamento da psoríase: relato de três casos

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    Ataíde Deborah Skusa de Torre

    2003-01-01

    Full Text Available Os autores relatam três casos de pacientes portadores de psoríase que utilizaram inadvertidamente doses elevadas de metotrexato e apresentaram ulceração das lesões cutâneas de psoríase. Os efeitos adversos cutâneos do metotrexato são raros, algumas vezes dose-dependentes, outras idiossincrásicos ou relacionados com alteração de metabolização da droga, ou, ainda, interações medicamentosas

  1. Comportamento da dose glandular versus contraste do objeto em mamografia: determinação de formalismo semi-empírico para diferentes combinações alvo-filtro Behavior of subject contrast versus glandular dose in mammography: determination of a semi-empirical formalism for different target-filter combinations

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    Gabriela Hoff

    2006-06-01

    Full Text Available OBJETIVO: Verificar o efeito da mudança no contraste do objeto, tempo de exposição e dose de radiação quando diferentes espessuras de filtração de molibdênio (Mo e ródio (Rh são empregadas em mamógrafos. MATERIAIS E MÉTODOS: Realizaram-se medidas da exposição na entrada da pele com uma câmara de ionização para diferentes espessuras para os filtros de Mo e Rh. Para determinar a dose glandular média foi utilizado simulador de BR12 (50% tecido adiposo e 50% tecido glandular de diferentes espessuras (4 cm e 8 cm. Energias na faixa de 24 kVp a 34 kVp foram empregadas e filmes Kodak MinR 2000 foram utilizados. RESULTADOS: Os resultados evidenciaram dados de contraste do objeto, dose glandular e tempo de exposição para diferentes espessuras de filtros adicionais e diferentes tensões. Esses dados indicaram aumento nos valores de contraste do objeto e tempo de exposição, com o aumento da espessura dos filtros. A dose glandular apresentou comportamento com diferentes tendências para cada caso analisado. Equações foram definidas para possibilitar a estimativa do contraste do objeto, dose glandular e tempo de exposição para os casos estudados. CONCLUSÃO: Os resultados possibilitaram a estimativa de equações que auxiliam na verificação do comportamento do contraste do objeto e da dose glandular para simuladores com espessura de 4 cm e 8 cm e para os filtros de Rh e Mo. Dessa forma, torna-se possível estimar a figura de mérito (razão entre o contraste do objeto e a dose glandular, podendo auxiliar na análise da relação risco-benefício dos casos estudados.OBJECTIVE: Our purpose was to verify the effect of changes in subject contrast, exposure time and radiation dose when different thicknesses of molybdenum (Mo and rhodium (Rh filters are used in mammography equipments. MATERIALS AND METHODS: Entrance skin exposure measurements were performed with an ionization chamber for different thicknesses of Mo and Rh filters

  2. Índice orientador do tratamento sistêmico da gravidez ectópica íntegra com dose única de metotrexato Index for the systemic treatment of unruptured ectopic pregnancy with a single dose of methotrexate

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    Julio Elito Junior

    1998-04-01

    Full Text Available Foi realizado estudo longitudinal em 42 pacientes com diagnóstico de gravidez ectópica íntegra, com o intuito de se elaborar um índice orientador do uso sistêmico de metotrexato em dose única (50 mg/m² por via intramuscular. O acompanhamento se fez através de dosagens de beta-hCG (fração beta do hormônio gonadotrópico coriônico realizadas no 1º, 4º e 7º dias após o emprego do quimioterápico. Quando ocorreu queda de 15% ou mais nos títulos de beta-hCG, apurados no 4º e no 7º dia, as pacientes receberam alta hospitalar e seguimento ambulatorial com dosagens semanais de beta-hCG até que se atingissem níveis inferiores a 5 mUI/ml. Foi elaborado um índice orientador do tratamento sistêmico com metotrexato baseado nos seguintes parâmetros: (1 valores iniciais de beta-hCG; (2 aspecto da imagem à ultra-sonografia (hematossalpinge, anel tubário, embrião vivo; (3 maior diâmetro da massa anexial; (4 quantidade de líquido livre; (5 fluxo vascular medido por meio do doppler colorido. Cada parâmetro recebeu pontuação de 0 a 2. A nota zero significa elemento de mau prognóstico, a nota dois indica parâmetros favoráveis e a nota um, situações intermediárias. O índice de sucesso com dose única foi de 69,0% (29/42 pacientes. A ultra-sonografia transvaginal com doppler colorido foi realizada em 20 das 42 pacientes do estudo. Neste grupo de 20 pacientes o sucesso do tratamento ocorreu em 75,0% dos casos (15/20. Entre as 22 pacientes que não foram avaliadas com doppler colorido a média das notas do índice nos casos de sucesso foi de 6,6, nas de insucesso 3,1. No grupo de pacientes avaliadas por doppler (20 pacientes as médias foram de 7,9 (sucesso e 4,2 (fracasso. No presente estudo a nota de corte foi estabelecida levando-se em conta o valor abaixo do qual o tratamento não foi efetivo e correspondeu a cinco, pois 93,75% das pacientes com nota superior a 5 evoluíram com sucesso (15/16, ao passo que notas inferiores ou

  3. Doses de boro e crescimento radicular e da parte aérea de cultivares de arroz de terras altas Influence of boron addition on growth of roots and shoot of upland rice crops

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    Juliano Corulli Corrêa

    2006-12-01

    Full Text Available O crescimento radicular é favorecido em condições adequadas de disponibilidade de boro no solo e, por isto, a aplicação da dose correta desse micronutriente é de grande importância, para que não ocorra prejuízo no desenvolvimento e na produtividade da cultura de arroz de terras altas, de acordo com a variedade e tipo de solo. O presente trabalho teve como objetivo avaliar a influência das doses de boro no crescimento radicular e da parte aérea, em três cultivares de arroz de terras altas. O experimento foi realizado em casa de vegetação, em vaso com capacidade de 10 L, que continha 8 dm³ de solo Latossolo Vermelho distrófico, sendo o delineamento experimental inteiramente casualizado, em esquema fatorial 3 x 3, com quatro repetições. Os tratamentos consistiram de três cultivares (Caiapó, Primavera e Maravilha e três doses de boro (0, 3 e 6 mg dm-3, usando, como fonte, o bórax. A dose de 6 mg dm-3 foi prejudicial tanto à produção de matéria seca da parte aérea como de raiz para o arroz de terras altas. Além de apresentar maior capacidade de absorção de boro, o cultivar Maravilha apresentou-se mais tolerante à elevação da disponibilidade de B no solo, não ocorrendo alterações de comprimento, diâmetro e superfície radicular.Appropriate boron (B availability in soils favors root growth, and a sufficient supply of this micronutrient is very important for adequate rice development and yield in upland fields, depending on the cultivars and soil type. This study aimed at evaluating the influence of B addition on growth of roots and shoot of three upland rice cultivars. The experiment was carried out in a greenhouse, in 10 L pots containing 8 kg of an Hapludox; the experiment was in a completely random 3 x 3 factorial design, with four replications. The treatments consisted of three rice cultivars (Caiapó, Primavera, and Maravilha and three B rates (0, 3 and 6 mg dm-3, as borax. The B rate of 6 mg dm-3 boron was

  4. Estudo da circulação hepatomesentérica pela angiografia por ressonância magnética com gadolínio: comparação entre doses simples e dupla no estudo de pacientes esquistossomóticos Gadolinium-enhanced magnetic resonance angiography for hepatomesenteric vascular evaluation: single and double doses comparison in schistosomiasis patients

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    Rogério Pedreschi Caldana

    2006-08-01

    Full Text Available OBJETIVO: Determinar a freqüência de visualização dos segmentos da circulação hepatomesentérica pela angiografia por ressonância magnética (angio-RM com contraste e comparar o valor do método, utilizando-se duas diferentes dosagens de gadolínio (doses simples e dupla. MATERIAIS E MÉTODOS: Estudo prospectivo de 36 pacientes esquistossomóticos submetidos a angio-RM. Os exames foram realizados em equipamento de RM de 1,5 T, usando-se bobina de corpo e bomba injetora para a administração endovenosa do contraste. Foram utilizadas, de maneira randomizada, dose dupla do contraste paramagnético (0,2 mmol/kg de Gd-DTPA em 21 pacientes e dose simples (0,1 mmol/kg em outros 15 pacientes. Os exames foram interpretados por dois observadores em consenso, que classificaram o grau de visualização de 25 segmentos vasculares estabelecidos para análise, sem conhecimento da dose de gadolínio utilizada. RESULTADOS: Os segmentos vasculares proximais e de maior calibre foram as estruturas com melhor grau de visualização na maioria da amostra em estudo. O tronco celíaco, a artéria hepática comum, a artéria esplênica, a croça e terço médio da artéria mesentérica superior, a veia porta, a veia esplênica e a veia mesentérica superior apresentaram grau 2 de visualização em mais de 70% da amostra. Quanto à comparação das diferentes dosagens, não houve diferença significante (p OBJECTIVE: To evaluate the visibility of hepatomesenteric vascular segments by 3D gadolinium-enhanced magnetic resonance (MR angiography and to compare the method effectiveness between two different gadolinium doses (single and double doses. MATERIALS AND METHODS: A prospective study was performed with 36 schistosomiasis patients who were submitted to 3D contrast-enhanced MR angiography. Scans were performed in a high-field equipment (1.5 T, with body coil and power injector for intravenous contrast administration. Contrast double doses (Gd-DTPA 0.2 mmol/kg and

  5. Variabilidade clínica na determinação da dose tóxica oral em intoxicação experimental por fluoroacetato de sódio em gatos

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    Rita de Cássia Collicchio-Zuanaze

    2006-02-01

    Full Text Available O fluoroacetato de sódio (FAS ou composto 1080 é um potente rodenticida utilizado no controle de roedores e predadores mamíferos. Sua utilização está proibida por lei em diversos países devido à sua alta toxicidade, mas no Brasil há evidências do uso ilegal e sem critérios causando intoxicações, principalmente em crianças e animais domésticos. O FAS age por meio do seu metabólito tóxico, o fluorocitrato, no bloqueio do ciclo de Krebs com conseqënte diminuição da produção de energia do organismo, provocando principalmente manifestações clínicas neurológicas e cardíacas. No presente estudo compararam quatro doses orais tóxicas do fluoroacetato de sódio, descritas em gatos, na literatura, observando-se o aparecimento dos sinais clínicos predominantes da intoxicação, as diferenças entre as doses quanto a variabilidade clínica em relação ao período de latência para o aparecimento dos sinais clínicos e sua respectiva intensidade. A dose oral tóxica que melhor caracterizou o quadro clínico da intoxicação por FAS em gatos, sem causar a letalidade aguda, foi de 0,45mg/kg. As diferenças entre as manifestações clínicas foram dose-dependentes e em ordem crescente de intensidade, caracterizando-se como sinais leves (dose 1: 0,3mg/kg, leves a moderados (dose 2: 0,4mg/kg, moderados a graves (dose 3: 0,45mg/kg e graves (dose 4: 0,5mg/kg. Houve também variabilidade clínica individual entre animais intoxicados com a mesma dosagem do tóxico.

  6. Dose estimative in operators during petroleum wells logging with nuclear wireless probes through computer modelling; Estimativa da dose em operadores durante procedimentos de perfilagem de pocos de petroleo com sondas wireless nucleares atraves de modelagem computacional

    Energy Technology Data Exchange (ETDEWEB)

    Souza, Edmilson Monteiro de; Silva, Ademir Xavier da; Lopes, Ricardo T., E-mail: emonteiro@nuclear.ufrj.b, E-mail: ademir@nuclear.ufrj.b, E-mail: ricardo@lin.ufrj.b [Coordenacao dos Programas de Pos-Graduacao de Engenharia (COPPE/UFRJ), Rio de Janeiro, RJ (Brazil). Programa de Engenharia Nuclear; Lima, Inaya C.B., E-mail: inaya@lin.ufrj.b [Coordenacao dos Programas de Pos-Graduacao de Engenharia (COPPE/UFRJ), Rio de Janeiro, RJ (Brazil). Programa de Engenharia Nuclear; Instituto Politecnico do Rio de Janeiro (IPRJ/UERJ), Nova Friburgo, RJ (Brazil); Correa, Samanda Cristine Arruda, E-mail: scorrea@cnen.gov.b [Comissao Nacional de Energia Nuclear (DIAPI/CGMI/CNEN), Rio de Janeiro, RJ (Brazil); Rocha, Paula L.F., E-mail: ferrucio@acd.ufrj.b [Universidade Federal do Rio de Janeiro (UFRJ)., RJ (Brazil). Dept. de Geologia

    2011-10-26

    This paper evaluates the absorbed dose and the effective dose on operators during the petroleum well logging with nuclear wireless that uses gamma radiation sources. To obtain the data, a typical scenery of a logging procedure will be simulated with MCNPX Monte Carlo code. The simulated logging probe was the Density Gamma Probe - TRISOND produced by Robertson Geolloging. The absorbed dose values were estimated through the anthropomorphic simulator in male voxel MAX. The effective dose values were obtained using the ICRP 103

  7. Efeito de doses de metribuzin no crescimento e na conversão da energia solar em plantas de soja (Glycine max (L . merrill Effect of metribuzin doses on the growth and solar energy conversion in soybean (Glycine max (L. merrill plants

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    P. J. Silva Neto

    1991-01-01

    Full Text Available O crescimento e a eficiência na conversão da energia solar foram estudados em soja (Glycine max (L. Merri ll, cv. 'Uberaba', cultivada em condições de campo, sob quatro doses de metribuzin (0, 0,35; 0,70 e 1,05 kg i.a.ha-1. O valor máximo da conversão da energia solar foi de 0,75%, para as plantas cultiva das na maior dose do herbicida. Os valores da conversão da energia solar média durante o ciclo da cultura foram 0,32 ; 0,31 ; 0,32 e 0,33%. em ordem crescente de dose do metribuzin. De modo geral, na fase vegetativa as plantas controle apresentaram valores inferiores em todos os valores de crescimento determinados, superando as tratadas com metribuzin somente na fase reprodutiva, mostrando que no período crítico de competição o dano causado pelas plantas daninhas é maior que a possível fitotoxicida de causada pelo metribuzin.Growth analysis and evaluation of solar energy conversion in soybean (Glycine max (L. Merrill, Uberaba unver field conditions and four doses of metribuzin (0,0;0,35; 0,70 and 1,05 kg i.a.ha-1 were performed in this study. Maximum solar energy conversion was 0,75% for pla nts tre ate d wit h 1,05 kg i.a.ha -1 metribuzin. The aver age of solar energy conversion throughout the entire crop cycle were 0,32, 0,31 , 0,32 and 0,33% for the increasing metribuzin doses. In general, the control showed lower figures for all growth values studied than the treated during the vegetative phase. During the reproductive phase, however, they surpassed those tre ated with metribuzin, showing that in the critical period of competition weeds were more harmful than the phytotoxicity produced by metribuzin.

  8. Verificação do fator de calibração e indicador da qualidade do feixe de aceleradores lineares Verification of dose output and beam quality indicator in linear accelerators

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    Maria da Penha Silva

    2001-10-01

    Full Text Available Um programa de garantia da qualidade é um pré-requisito obrigatório para a exatidão necessária em radioterapia. Este trabalho relata parte dos testes de rotina mensal do controle da qualidade dos aceleradores lineares do Instituto Nacional do Câncer, relativos à calibração dos feixes de fótons e elétrons, no período de dois anos. Os resultados foram comparados com as recomendações do protocolo AAPM TG-40. Na análise do fator de calibração para o feixe de fótons foi encontrado um desvio máximo de 12%; para o feixe de elétrons o maior desvio encontrado foi 10%. A flutuação observada no indicador da qualidade do feixe para os feixes de elétrons foi maior que para os feixes de fótons. Os resultados confirmam a importância de um programa de garantia da qualidade em um serviço de radioterapia, permitindo correções rápidas da dose administrada ao paciente.A quality assurance program is a mandatory prerequisite for obtaining the high level of accuracy required for radiotherapy. This paper reports the results of part of the routine quality control tests for linear accelerators at the National Cancer Institute, Brazil, performed monthly over a period of two years. These tests included dose output and beam quality indicator. The results were compared with the guidelines of the AAPM TG-40 protocol. The results for the photon beams have shown dose output variations of up to 12%; for electron beams, the largest deviation found was 10%. The fluctuations observed in the beam quality indicator for the electron beams were greater than for the photon beams. These results strongly emphasize the importance of a quality assurance program in radiotherapy services in order to allow prompt corrections of the dose delivered to the patient.

  9. Validation of dose-response curve of CRCN-NE - Regional Center for Nuclear Sciences from Northeast Brazil for {sup 60}Co: preliminary results; Validacao da curva dose-resposta do CRCN-NE para {sup 60}Co: resultados preliminares

    Energy Technology Data Exchange (ETDEWEB)

    Mendonca, Julyanne C.G.; Mendes, Mariana E.; Hwang, Suy F.; Lima, Fabiana F. [Centro Regional de Ciencias Nucleares do Nordeste (CRCN-NE/CNEN-PE), Recife, PE (Brazil); Santos, Neide, E-mail: july_cgm@yahoo.com.br [Universidade Federal de Pernambuco (CCB/UFPE), Recife, PE (Brazil). Departamento de Genetica

    2014-07-01

    The cytogenetic study has the chromosomal alterations as biomarkers in absorbed dose estimation by the body of individuals involved in exposure to ionizing radiation by interpreting a dose response calibration curve. Since the development of the technique to the analysis of data, you can see protocol characteristics, leading the International Atomic Energy Agency indicate that any laboratory with intention to carry out biological dosimetry establish their own calibration curves. The Biological Dosimetry Laboratory of the Centro Regional de Ciencias Nucleares (CRCN-NE/CNEN), Brazil, recently established the calibration curve related to gamma radiation ({sup 60}Co). Thus, this work aimed to start the validation of this calibration curve from samples of three different blood donors which were irradiated with an absorbed known single dose of 1 Gy. Samples were exposed to {sup 60}Co source (Glaucoma 220) located in the Department of Nuclear Energy (DEN/UFPE). After fixation with methanol and acetic acid and 5% Giemsa staining, the frequency of chromosomal alterations (dicentric chromosomes, acentric rings and fragments) were established from reading of 500 metaphases per sample and doses were estimated using Dose Estimate program. The results showed that, using the dose-response curve calibration for dicentrics, the dose absorbed estimated for the three individuals ranged from 0.891 - 1,089Gy, taking into account the range of confidence of 95%. By using the dose-response curve for dicentrics added to rings and for the same interval of confidence the doses ranged from 0,849 - 1,081Gy. Thus, the estimative encompassed known absorbed dose the three individuals in confidence interval of 95%. These preliminary results seems to demonstrate that dicentric dose-response curves and dicentrics plus rings established by CRCN-NE / CNEN are valid for dose estimation in exposed individuals. This validation will continue with samples from different individuals at different doses.

  10. Estudo comparativo da qualidade de imagem dos modos de aquisição da PET: validação de um protocolo para reduzir a dose de radiação Comparative study on imaging quality in PET acquisition modes: validation of a protocol for reducing the radiation dose

    Directory of Open Access Journals (Sweden)

    Solange Amorim Nogueira

    2009-04-01

    Full Text Available OBJETIVO: O presente experimento visa a validar um protocolo de aquisição em 3D na tomografia por emissão de pósitrons, em substituição ao modo 2D, de forma a reduzir a dose de radiação nos pacientes, sem perda da qualidade de imagens. MATERIAIS E MÉTODOS: Foram realizadas 27 simulações em equipamento Discovery ST, nos modos 2D com quatro minutos de aquisição e 3D com dois e quatro minutos. Utilizou-se um simulador do protocolo da National Electrical Manufacturers Association. No interior deste simulador estão inseridas seis esferas com diferentes diâmetros para a determinação da qualidade de imagem. As aquisições foram comparadas por três médicos nucleares, sem que eles identificassem o modo de aquisição. Cada observador atribuiu o valor igual a 1 quando alguma esfera não foi identificada ou valor 2 para esferas visíveis. RESULTADOS: A análise qualitativa pelo kappa generalizado demonstrou que a frequência de esferas visíveis foi maior no modo 3D com quatro minutos (85% e a porcentagem de concordância também foi maior (88,9%, com kappa generalizado = 0,725 [0,507;0,942]. CONCLUSÃO: O modo 3D com quatro minutos de aquisição e com menores atividades de FDG-18F pode ser utilizado em pacientes com biótipo equivalente ao simulador, sem perda de qualidade de imagem.OBJECTIVE: The present study is aimed at validating a 3D acquisition protocol for positron emission tomography as a replacement for the 2D mode, to reduce the radiation dose delivered to patients, without any loss in the quality of images. MATERIALS AND METHODS: The study comprised 27 simulations in a Discovery ST equipment with four-minute 2D acquisitions, and two-minute and four-minute 3D acquisitions, utilizing a chest phantom according to the National Electrical Manufacturers Association protocol. Six spheres with different diameters were inserted into this phantom as a means for determining the images quality. The images were blindly reviewed by three

  11. Crescimento e teores de clorofila em mudas de bananeira em função da supressão do pseudocaule, de doses de nitrogênio e de boro Growth and chlorophyll content of banana suckers in function of pseudostem suppression and doses of nitrogen and boron

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    Walter Esfrain Pereira

    2010-12-01

    Full Text Available O objetivo deste experimento foi avaliar a influência da eliminação da gema apical do rizoma e de doses de nitrogênio e boro, sobre a produção e o crescimento de mudas de bananeira. O experimento foi realizado no Centro de Formação de Tecnólogos da UFPB. O delineamento foi em blocos casualizados, com quatro blocos e nove plantas matrizes por parcela, sendo duas plantas úteis. Os fatores avaliados foram doses de N (0 a 240 g/planta e de B (0 a 2,2 g/planta combinados com a matriz experimental Composto Central de Box, originando nove combinações, arranjados fatorialmente com e sem eliminação da gema apical da planta matriz. Os dados foram submetidos à análise de variância e de regressão. A supressão do pseudocaule da planta principal, com a eliminação da gema apical do rizoma aumentou o número de perfilhos, com maior crescimento, exceto do diâmetro do rizoma, o qual diminuiu. Os teores foliares de clorofila total e de B também foram diminuídos, nos perfilhos das bananeiras amputadas. Para a produção de mudas da bananeira ‘Pacovan’, recomenda-se a supressão do pseudocaule da planta principal, com eliminação da gema apical do rizoma e aplicação do N.The objective of this research was to evaluate the influence of the removal in the pseudostem with elimination of the meristem apical of the rhizome and doses of nitrogen and boron, about the production and growth of banana suckers. The experiment was carried out at Centro de Formação de Tecnólogos - UFPB, State of Paraíba. The experimental design was in randomized blocks, with four replications and nine mother plants for experimental unit, being two useful plants. The evaluated valued factors were doses of N (0 to 240 g plant-1 and of B (0 to 240 g plant-1 combined in agreement with the experimental matrix ‘Central Composite’, originating nine combinations, which were arranged factorially with suppression and without suppression of the pseudostem of the mother

  12. Caracterização da dose letal mínima por irradiação gama para Penicillium citrinum Characterization of minimum lethal dosis of gama irradiation to Penicillium citrinum

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    A. N. Norberg

    1993-12-01

    Full Text Available O uso das radiações ionizantes na destruição de microrganismos responsáveis pela deterioração de alimentos ou causadores de infecções ou toxinfecções alimentares, constituiu-se aplicação da energia nuclear, para fins verdadeiramente pacíficos. Penicillium citrinum é um fungo produtor de micotoxinas, responsáveis por intoxicações em humanos e animais que se utilizam de alimentos contaminados. Há escassez de informações sobre a resistência do P. citrinum à irradiação gama; assim esta pesquisa objetivou determinar a dose letal por irradiação gama para esse microrganismo. Foram irradiadas 76 suspensões, contendo aproximadamente 100.000 esporos por mililitro, com doses entre 0,2 e 2,2 KGy (KiloGray, sendo os sobreviventes re-irradiados com doses até 3,0 KGy. O fungo foi totalmente destruído com dose de 2,2 KGy. P. citrinum descendentes dos sobreviventes de 2,0 KGy, quando re-irradiados também foram totalmente destruídos com dose de 2,2 KGy. Observou-se um aumento da resistência às doses mais baixas em relação ao fungo não irradiadoThe use of nuclear power through radiation for the destruction of microrganisms which cause food decay, and toxicosis, is specifically for peaceful purposes. Penicillium citrinum is a fungus which produce mycotoxins responsible for intoxication in humans and animals as a result of eating contaminated food. There is little informations on the resistance of P. citrinum to radiation. The objective of this research is to determine the lethal dose of gama radiation for these microrganisms. Seventy six suspensions containing approximately 100,000 spores/ml received a dose of radiation between 0.2 and 2.2 KGy (KiloGray, being one sample still alive re-irradiated with doses up to 3.0 KGy. The fungus were totally destroyed with a 2.2 KGy. Seventy six suspensions containing approximately 100,000 spores/ml received a dose of radiation between 0.2 and 2.2 KGy, being one sample still alive re

  13. Radiochromic film use to record dose profile variations in chest CT scan; Utilizacao do filme radiocromico para registro da variacao do perfil de dose em varredura de TC de torax

    Energy Technology Data Exchange (ETDEWEB)

    Mourao, Arnaldo P.; Santana, Priscila C., E-mail: aprata@des.cefetmg.br [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Departamento de Engenharia Nuclear; Silva, Teogenes A. da; Alonso, Thessa C. [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)

    2015-12-15

    The CT scans generate higher doses in patients than those caused by other types of diagnostic radiology using the attenuation of X-ray beams. Technological advances have increased the clinical applications of computed tomography (CT) and consequently the demand for these exams. Dose reduction strategies are difficult to implement because of a lack of proper guidance on the CT scanning. However, CT offers the possibility of adjusting the image acquisition parameters according to the patient physical profile and the diagnostic application for which it is intended to scan. Knowledge of the dose distribution is important when thinking about varying the acquisition parameters to reduce the dose. In this work was used a PMMA chest phantom to observe the dose deposition in 5 areas. Radiochromic film strips were placed inside the chest phantom, in peripheral and in the central region. The phantom was placed in the scanner isocenter and it was performed the irradiation of its central region using a chest acquisition protocol. After the phantom CT scan the radiochromic film strips were processed for obtaining digital images. Digital images were reworked to obtain the dose variation profiles for each position. The results showed a wide variation in absorbed dose by the phantom, either within a same position along the length of the film strip, as in the comparison among the five regions which the strips are placed. In this second case the dose variations were even greater. (author)

  14. Influência da irrigação, da densidade de plantio e da adubação nitrogenada nas características morfogênicas, estruturais e de produção do capim-tanzânia Morphogenesis and structural characteristics and production of guinea grass irrigated under different plants density and nitrogen doses

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    Marcela de Azevedo Magalhães

    2011-11-01

    Full Text Available O experimento foi conduzido com os objetivos de avaliar a altura do dossel com 95% de interceptação luminosa e quantificar a influência da adubação nitrogenada e da densidade de plantas nas características morfogênicas e estruturais de capim-tanzânia. Quatro doses de nitrogênio, N (0, 80, 160 e 320 kg.ha-1, foram combinadas com três densidades de plantas (9, 25 e 49 plantas.m-2, em um arranjo fatorial 4 × 3, em delineamento inteiramente casualizado com três repetições, para avaliação da produção de biomassa, e duas repetições, para avaliação das características morfogênicas e estruturais. O acúmulo de MS total durante o período experimental foi influenciado pela adubação nitrogenada e pela densidade de plantas. No período das águas, as maiores doses de nitrogênio diminuíram o intervalo de colheitas e, consequentemente, aumentaram o número de colheitas. A altura do dossel de capim-tanzânia com 95% de IL foi positivamente influenciada pela densidade de plantas nos períodos das águas e de transição água-seca e seca. A altura do capim-tanzânia com 95% de IL apresentou variações ao longo das avaliações, de modo que os valores foram maiores (próximos a 70 cm no período das águas, seguido pelos períodos de transição água-seca e seca.This experiment was carried out to evaluate canopy height of guinea grass with 95% of photosynthetic active radiation interception and quantify the nitrogen fertilization influence and plants' density on the morphogenesis and structural characteristics of Tanzania grass. Four doses of N (0, 80, 160 e 320 kg.ha-1, were arranged with three plant densities (9, 25 and 49 plants.m-2, according to 4 × 3 completely randomized design, with three repetitions. Total dry matter (DM accumulation throughout the experimental period was influenced by nitrogen fertilization and plants' density. In the rainy period, the higher nitrogen fertilization decreased the harvesting intervals, and

  15. Assessment of influence of OSL dosimeters in the skin dose in radiotherapy: study for Monte Carlo simulation; Avaliacao da influencia de dosimetros OSL na dose na pele em radioterapia: estudo por simulacao Monte Carlo

    Energy Technology Data Exchange (ETDEWEB)

    Schuch, Franciely F.; Nicolucci, Patricia, E-mail: franschuch@yahoo.com.br [Universidade de Sao Paulo (USP), Ribeiraoo Preto, SP (Brazil)

    2017-11-01

    The interest in optically stimulated luminescence (OSL) dosimetry materials is growing due to its potential use in quality control in Radiotherapy. The use of these dosimeters for in vivo dosimetry, however, may influence the dose to the skin and deeper tissues in the patient. The goal of this study is to evaluate the influence of the OSL Al{sub 2}O{sub 3} material in dose deposited in the skin and deep in Radiotherapy. Monte Carlo simulation is used to evaluate this purpose when OSL dosimeters of Al{sub 2}O{sub 3} are positioned on the skin surface of the patient. Percentage depth dose curves for clinical beams of 6 and 10 MV were simulated with and without the presence of the dosimeter on the surface of a water phantom. The results showed a decrease of doses in regions close to the surface of the skin. In the build-up region, the maximum decreases of dose produced by the presence of the dosimeters were 52,5% and 47,5% for the 6 and 10 MV beams, respectively. After the build-up region, there are not significant changes in the doses for any of the used beams. The differences of doses found are due to the influence of the dosimetric material on the relative fluence of electrons near the end surface of the dosimeter. Thus, the results showed that the presence of the dosimetric material on the surface interferes on the skin dose. However, these dosimeters do not cause dose variations in depths of clinical interest, allowing its application in routine in vivo dosimetry in Radiotherapy. (author)

  16. Radiation dose evaluation in pediatric urethrocystography professionals, patients and companions of patients; Avaliação da dose em profissionais, pacientes e acompanhantes de pacientes em exames de uretrocistografia pediátrica

    Energy Technology Data Exchange (ETDEWEB)

    Just, W.; Lykawka, R.; Anés, M.; Cunha, R.; Goulart, J.M.; Bacelar, A., E-mail: rlykawka@hcpa.edu.br [Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, RS (Brazil). Laboratório de Imagens Médicas e Radioproteção

    2017-07-01

    Urinary urethrocystography is suggested as the second stage in the diagnosis of urinary tract infection, according to the ACR Adequacy Criteria. When performed in pediatric patients, it may be necessary to contain the patient, increasing the risk of exposure of the professionals involved. To assess the exposure levels of those involved in this test, we estimated the radiation doses in patients, companions and professionals. A total of 56 pediatric urethrocystography examinations were performed on the SHIMADZU Sonialvision fluoroscopy equipment. We measured the DAP with the VacuDAP Duo equipment. The effective dose of radiologist and companion were estimated using RaySafe i2 dosimeters; the equivalent dose received on the radiologist's pulse was estimated with optically stimulated dosimeters. The results of the collected data are expressed by median [first quartile - third quartile]. The exposure time was 5.38 [3.00 - 9.64] s; or DAP 119.58 [76.62 - 350.88] μGym²; the dose for the radiologist physician in the thorax 0.01 [0.00 - 0.02] mSv and in the pulse 0.05 [0.03 - 0.14] mSv; the companion dose 0.00 [0.00 - 0.01] mSv. Despite the radiologist's proximity to the primary X-ray beam, his dose to the wrist and chest does not reach the limit of annual doses established in Brazilian legislation. The dose of the companion is less than the effective dose condition established in national legislation.

  17. Optimization of the dose versus noise in the image on protocols for computed tomography of pediatric head;Otimizacao da relacao dose versus ruido na imagem em protocolos de tomografia computadorizada de cranio pediatrico

    Energy Technology Data Exchange (ETDEWEB)

    Saint' Yves, T.L.A.; Travassos, P.C.; Goncalves, E.A.S.; Mecca, F.A.; Silveira, T.B. [Instituto Nacional de Cancer (INCA), Rio de Janeiro, RJ (Brazil)

    2009-07-01

    This article aims to establish protocols optimized for computed tomography of pediatric skull, to the Picker Q 2000 tomography of the Instituto Nacional de Cancer, through the analysis of dose x noise on the image with the variation of values of m As and k Vp. We used a water phantom to measure the noise, a pencil type ionization chamber to measure the dose in the air and the Alderson Randon phantom for check the quality of the image. We found values of m As and k Vp that reduce the skin dose of the original protocol used in 35.9%, maintaining the same image quality at a safe diagnosis. (author)

  18. Acúmulo e repartição da matéria seca da planta de pepino tipo conserva sob três doses de nutrientes minerais Dry matter accumulation and distribution of pickling cucumber plants under three mineral nutrient levels

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    Hugo Nicasio Rodríguez Espínola

    2001-06-01

    Full Text Available Determinou-se o efeito de três doses de nutrientes minerais sobre o acúmulo e distribuição da matéria seca da planta de pepino tipo conserva, híbrido Crispina. As plantas foram cultivadas em sacolas plásticas com 4,6kg de substrato composto por uma mistura de 40% de casca de arroz e 60% de solo, no interior de uma estufa de polietileno, na primavera de 1998 e no verão de 1999. Foi empregado um delineamento experimental de blocos casualizados, com três repetições e 15 plantas por parcela. Os tratamentos foram constituídos por três níveis múltiplos de uma dose padrão de nutrientes aplicada para cada planta, contendo N-P-K-Ca e Mg nas quantidades de 0,8-0,12-0,8-0,46-0,086g.pl-1, com 0,33m de solução de micronutrientes e 0,07m de quelato de ferro. Os níveis corresponderam às quantidades de 50%, 100% e 150% da dose padrão, denominados de tratamentos T1, T2 e T3, respectivamente, aplicados semanalmente através da fertirrigação em todas as plantas de uma mesma parcela. Determinou-se a matéria seca dos diferentes órgãos da parte aérea da planta a intervalos semanais. Houve efeito significativo dos tratamentos no acúmulo da matéria seca, nos dois experimentos. A maior fração foi alocada para os frutos, atingindo o valor mais elevado de 0,64 na primavera. Concluiu-se que a distribuição da matéria seca desse material vegetal não é constante, sofrendo interações com as variáveis do ambiente.It was determined the effect of three mineral nutrient levels on dry matter accumulation and distribution of pickling cucumber plants, hybrid Crispina, grown inside a polyethylene greenhouse, in spring 1998 and in summer 1999. Planting was made in bags filled with 4.6kg of a substrate mixture composed by 40% rice husks and 60% soil. A randomized block experimental design was used, with three replications and15 plants per plot. A reference nutrient dose was supplied weekly to each one of the plants, with the following composition

  19. Incidência e severidade do "furo de bala" em folhas da ameixeira sob doses de nitrogênio e potássio Incidence and severity of 'shot hole' in plum´s leaves related into nitrogen and potassium doses

    Directory of Open Access Journals (Sweden)

    Inês Tutida

    2007-10-01

    Full Text Available A produção integrada (PI vem suprir uma demanda crescente de frutos de qualidade, garantir segurança alimentar, produção com qualidade ambiental e rastreabilidade. Na visão da PI, as práticas da adubação e do controle de doenças estão intimamente relacionadas; no entanto, tem sido negligenciadas e pouco estudadas, principalmente para a doença "furo de bala" (Wilsonomyces carpophilus em folhas de ameixeira (Prunus salicina. O objetivo deste trabalho foi avaliar a incidência e severidade dessa doença em doses combinadas de adubação com N e K em dois ciclos de cultivo comercial de ameixeira cv "Reubennel", no município de Araucária (PR. Foram utilizadas cinco doses de N (40, 80, 120, 160 e 200kg ha-1ano-1 e duas de K (55 e 110kg ha-1ano-1. Realizaram-se sete avaliações para incidência e severidade a cada 20 dias, no período de novembro/2004 a março/2005 e em data única em outubro/2005. Os dados da primeira safra foram integralizados no tempo, constituindo a área abaixo da curva de progresso da doença (AACPD da incidência e severidade, e os dados foram analisados estatisticamente pela teoria dos modelos lineares generalizados para dados longitudinais. A doença foi mais severa no segundo ano de avaliação, sendo observado o máximo de 0,70 e 2,25 para o primeiro e o segundo ano, respectivamente. A incidência e a severidade de "furo de bala" em folhas de ameixeira são superiores nas doses de 160 e 200kg ha-1ano-1 de nitrogênio. O potássio não interfere na incidência e severidade da doença devido ao seu elevado teor encontrado no solo e na planta.Integrated Production (IP can provide the growing demand for quality fruit, food safety, environmental protection, and product traceability. In IP, fertilization practices and disease control are viewed as being closely related. However, this linkage has been mostly ignored and few studies are available concerning the 'shot hole' phytopathogen (Wilsonomyces carpophilus in

  20. Produção e composição químico-bromatológica da aveia preta fertilizada com doses crescentes de dejeto líquido suíno Production and chemical composition of the common black oats fertilized with growing doses of liquid swine manure

    Directory of Open Access Journals (Sweden)

    Daniela Mondardo

    2011-06-01

    Full Text Available O trabalho teve como objetivo avaliar o efeito da aplicação de doses crescentes de dejeto líquido suíno sobre a produção e composição químico-bromatológica da parte aérea da aveia preta. O experimento foi conduzido em sistema de plantio direto sob o delineamento em blocos casualizados com quatro repetições e os tratamentos constituídos pela aplicação de 0; 10; 20; 30; 40 e 50 m³ ha-1 de dejeto líquido suíno. Foram determinados a produção de MS da parte aérea, a relação folha:colmo e os teores de proteína bruta (PB, fibra em detergente ácido (FDA, fibra em detergente neutro (FDN, matéria mineral (MM, matéria orgânica (MO, nitrogênio (N, fósforo (P, potássio (K, cálcio (Ca, magnésio (Mg, cobre (Cu, zinco (Zn, manganês (Mn e ferro (Fe. A aplicação de dejeto líquido suíno não promoveu efeitos significativos sobre a produção de MS e teores de FDN, MM e MO, mas promoveu aumento linear da relação folha:colmo e do teor de PB e redução linear no teor de FDA. Quanto aos minerais, as doses de dejeto líquido suíno promoveram aumento linear nos teores de N, P, K, Ca e Zn, sem efeitos sobre os demais minerais estudados. A utilização de dejeto líquido suíno na fertilização da cultura da aveia até a dose de 50 m³ ha-1 não aumenta a produção de forragem mas eleva o valor nutricional.The work has as objective evaluate the effect of application of increasing doses of pig slurry under yield and chemical composition of black oat shoot. The experiment was carried out in no-tillage system under experimental design of randomized blocks with four replications and the treatments composed by application of 0; 10; 20; 30; 40; 50 m³ ha-1 of pig slurry. Were determined the yield of total dry mass, the leaf-stem ratio and content of crude protein (CP, acid detergent fiber (ADF, neutral detergent fiber (NDF, mineral matter (MM, organic matter (OM, nitrogen (N, phosphorus (P, potassium (K, calcium (Ca, magnesium (Mg

  1. Optimization in the nuclear fuel cycle I: Temporal variation of dose rate; Optimização no ciclo do combustível nuclear I: variação temporal da taxa de dose

    Energy Technology Data Exchange (ETDEWEB)

    Pereira, W.S., E-mail: pereiras@gmail.com [Universidade Veiga de Ameida (UVA), Rio de Janeiro, RJ (Brazil); Silva, A.X.; Lopes, J.M.; Carmo, A.S.; Fernandes, T.S.; Mello, C.R., E-mail: lararapls@hotmail.com, E-mail: Ademir@nuclear.ufrj.br [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil); Kelecom, A. [Universidade Federal Fluminense (UFF), Niterói, RJ (Brazil)

    2017-07-01

    Radioprotection aims to protect man and the environment from the harmful effects of radiation. Radioprotection is based on three fundamental principles: justification, dose limitation and optimization. Optimization is a complementary principle to dose limitation and should be applied in all phases of development, and even in unregulated situations. The aim of this work is to use the exposure rate as a tool to optimize radioprotection. The exposure rate at a nuclear facility was monitored at 15 points for one year and statistical tools for data analysis were proposed as auxiliary tools for the process of optimizing the dose rates measured at the facility. A total of 9,125 exposure-rate measures were performed during 2014. The monthly averages were organized by sampling point and by month of the year. No statistical difference was observed in the monthly variation of the dose rate. Therefore, this variable can not be used in the optimization process in this nuclear installation.

  2. Dose rate range extension of the calibration of dosemeters at LNMRI, Rio de Janeiro, Brazil; Expansao da faixa de taxas de dose para a calibracao de instrumentos de medir radiacao no LNMRI, Rio de Janeiro, Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Cabral, T.S.; Carlos, M.T.; Ramos, M.M.O., E-mail: tschirn@ird.gov.b, E-mail: marcia@ird.gov.b, E-mail: mmoramos@ird.gov.b [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2009-07-01

    The present work has an objective the implantation of a experimental arrange for application of essays of instrument calibration for measurement of low dose rate, which measure rate less than 10 {mu}Sv/h

  3. Analysis of dose in heterogeneity adjuvant radiotherapy after surgical treatment of cases of breast cancer; Analise da heterogeneidade de dose em radioterapia adjuvante apos tratamento cirurgico de casos de cancer de mama

    Energy Technology Data Exchange (ETDEWEB)

    Grechi, Bruna E.; Schwarz, Ana Paula, E-mail: anapaulaschwarz@yahoo.com.br [Centro Universitario Franciscano (UNIFRA), Santa Maria, RS (Brazil); Teston, Adriano; Rodrigues, Joanilso S. [Clinica de Radioterapia Santa Maria, Santa Maria, RS (Brazil)

    2013-12-15

    Assuming the systems planning radiotherapy recognize all body structures of the same density (d=1 g/cm³), variations in electron density within the irradiated area, as is the case of patients who undergo reconstruction mammary processes and use tissue expanders, may influence the dose distribution in the treatment and may produce heterogeneities which are not measured by changing its actual distribution into healthy tissues or in the target volume to be irradiated. Through the calculation of the algorithms' dose distribution of the XiO® planning system (Fast Fourier Transform, Convolution, Superposition, Fast Superposition e Clarkson), when using correction of heterogeneity between tissues of different densities, there was obtained a percentage ratio of dose increase in the structures of interest, and of the amount of absorbed dose by healthy organs adjacent to the target volume. (author)

  4. Radiation doses in mammography as planning parameters for premature breast cancer tracking programs; Doses de radiacao em mamografias como parametros de planejamento para programas de rastreamento do cancer precoce da mama

    Energy Technology Data Exchange (ETDEWEB)

    Souza Ferreira, Rubemar de

    1994-12-31

    Radiation doses are the main parameters applied to the evaluation of mammographic radiological impact. This study, for a sample of 407 women, were analyzed, through the thermoluminescent dosimetry, radiation doses in the surface of skin and glandular absorbed doses for cranio-caudal view. The results show the presence of a large dose range to the same mammographic procedure, which, analyzed enclosed with 585 facilities, suggest be necessary the standardization of the mammographic technique. From that results, with the additive model, the excess of breast cancer (radioinduced) and lifetime loss risk, for age groups between 30 and 70 years were estimated. Is demonstrated that the benefits from dedicated mammography, overcome the relationship among the epidemiological aspects of breast cancer and ionizing radiation as an harmful agent, which may show an important correlation for large exposed populations, point out the importance of the continuous risk and benefit evaluation to the new technologies introduced. (author). 86 refs., 40 figs., 14 tabs.

  5. A reference dosimetric system for dose interval of radiotherapy based on alanine/RPE; Um sistema dosimetrico de referencia para o intervalo de doses da radioterapia baseado na alanina/RPE

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues Junior, Orlando; Galante, Ocimar L.; Campos, Leticia L. [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)]. E-mail: rodrijr@net.ipen.br

    2001-07-01

    This work describes the development of a reference dosimetric system based on alanine/EPR for radiotherapy dose levels. Currently the IPEN is concluding a similar system for the dose range used for irradiation of products, 10-10{sup 5} Gy. The objective of this work is to present the efforts towards to improve the measure accuracy for doses in the range between 1-10 Gy. This system could be used as reference by radiotherapy services, as much in the quality control of the equipment, as for routine accompaniment of more complex handling where the total doses can reach some grays. The system uses alanine as detector and electronic paramagnetic resonance - EPR as measure technique. To reach accuracy better than 5% mathematical studies on the best optimization of the EPR spectrometer parameters and methods for the handling of the EPR sign are discussed. (author)

  6. Evaluation of radioiodine therapy with fixed doses of 10 and 15 mCi in patients with Graves disease; Avaliacao da radioiodoterapia com doses fixas de 10 e 15 mCi em pacientes com doenca de Graves

    Energy Technology Data Exchange (ETDEWEB)

    Canadas, Viviane; Vilar, Lucio; Moura, Eliane; Brito, Ana; Castellar, Enio [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Hospital das Clinicas. Servico de Endocrinologia]. E-mail: vivi2207@ig.com.br

    2007-10-15

    The treatment options for the hyperthyroidism of Graves' disease are antithyroid drugs, surgery and radioiodine, none of which is considered ideal, as they do not act directly on the etiopathogenesis of the disease. Radioiodine has been increasingly used as the treatment of choice because it is a safe and definitive therapy whose administration is very easy. Some authors prefer to administer higher doses in order to deliberately induce hypothyroidism, while others recommend lower doses that result in a lower incidence of hypothyroidism and a greater incidence of euthyroidism. There is no consensus for the optimal regimen of fixed doses to be used and this is the main focus of the present study, where doses of 10 and 15 mCi of {sup 131}I were compared. Among the 164 patients analyzed, 61 (37.2%) were submitted to 10 mCi and 103 (62.8%) to 15 mCi. In the longitudinal analysis it was observed that remission of the hyperthyroidism was statistically different in the sixth month (p < 0.001), being higher in the group that used the dose of 15 mCi, but similar in both groups at 12 and 24 months. It may be concluded that the administration of fixed doses of 10 and 15 mCi of {sup 131}I brought about a similar remission of the hyperthyroidism after 12 months of treatment. Moreover, the remission rate of the hyperthyroidism had no association with age, sex or previous therapy with antithyroid drugs. (author)

  7. Determination of bone mineral density of the distal extremity of the radio in Rottweiller, by radiographic optic densitometry;Determinacao da densidade mineral ossea da extremidade distal do radio de caes da raca Rottweiller, por meio da densitometria optica radiografica

    Energy Technology Data Exchange (ETDEWEB)

    Alves, Jefferson Douglas Soares, E-mail: radiologia@unifeob.edu.b [Fundacao de Ensino Octavio Bastos (UNIFEOB), Sao Joao da Boa Vista, SP (Brazil). Fac. de Medicina e Veterinaria; Sterman, Franklin de Almeida [Universidade de Sao Paulo (USP), Butanta, SP (Brazil). Fac. de Medicina Veterinaria e Zootecnia. Dept. de Cirurgia

    2010-06-15

    This study allowed the standardization of the bone mineral density (BMD) of the distal extremity of the radio of 36 dogs adults in Rottweiler breed by radiographic optic densitometry. The limbs of the animals were radiographed with scale of aluminum that served as a reference. The radiographs images were digitalized and analyzed by a computer program for comparison of gray tones between the standard image and the image of the reference scale radiographed with the bone. Afterwards the values of density were expressed in millimeters of aluminum. Also studied the correlations between BMD and the sex, weight and external measures as the length of spine, height of the animal and circumference the distal extremity of the limb in study. The mean values and standard deviations of the bone mineral density of the distal extremity of the radio were: for the metaphyseal region the average of BMD of 7,88+-0,89 mmAl, the diaphyseal region 1 the average of BMD of 8,58+-0,80 mmAl and for diaphyseal region 2 of BMD of 9,00+-0,74 mmAl. (author)

  8. Study of distribution dose for chest radiography using the computational model ALDERSON/EGSnrc; Estudo da distribuição de dose para radiografia de tórax utilizando o modelo computacional ALDERSON/EGSnrc

    Energy Technology Data Exchange (ETDEWEB)

    Muniz, B.C., E-mail: bianca.cm95@gmail.com [Instituto de Educação, Ciência e Tecnologia de Pernambuco (IFPE), Recife, PE (Brazil). Lab. de Dosimetria Numérica; Menezes, C.J.M. [Centro Regional de Ciências Nucleares do Nordeste (CRCN-NE/CNEN-PE), Recife, PE (Brazil). Lab. de Física Médica

    2017-07-01

    Numerical dosimetry uses Computational Exposure Models (MCE) to perform dose studies in situations of radiation exposure without the need for individuals to be exposed. MCEs are essentially composed of a simulator of the radioactive source, a Monte Carlo code, and a phantom of voxels representing the human anatomy. The objective of this work was to perform a study of the dose distribution in the thoracic region in radiographic exams using the MCE ALDERSON / EGSnrc. For that, virtual simulations were performed using Monte Carlo Method techniques to calculate the dose in the simulator of voxels representative of the thoracic region. The results show that most beam energy was deposited in the skeleton for all simulated radiological techniques, while smaller fractions were deposited in the lungs and soft tissue. For example, at 90 kV voltage, 14% of the energy was deposited in the bone medium, while lungs and soft tissue receive only 5 and 3%, respectively. It is concluded that the ALDERSON / EGSnrc MCE can be used for studies of the dose distribution on chest radiographs used in radiodiagnosis practice, thus optimizing dose absorbed in the patient in clinical exams.

  9. Evaluation of occupational radiation dose in nuclear medicine: radiopharmaceutical administration to scintiscanning exams of myocardial perfusion; Avaliacao da dose de radiacao ocupacional em medicina nuclear: administracao de radiofarmacos em exames de cintilografria de perfusao miocardica

    Energy Technology Data Exchange (ETDEWEB)

    Komatsu, Cassio V., E-mail: cassiok@yahoo.com [Medicina Nuclear do Triangulo (MNT), Uberlandia, MG (Brazil); Michelin, Charlie A.; Jakubiak, Rosangela R., E-mail: charlie@utfpr.edu.br, E-mail: requi@utfpr.edu.br [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil); Lemes, Alyne O.; Silva, Juliana L.M., E-mail: alyne275@gmail.com, E-mail: jujumontesdocinho@gmail.com [Faculdade do Trabalho (FATRA), Uberlandia, MG (Brazil)

    2013-11-01

    In nuclear medicine, workers directly involved in exams are constantly exposed to ionizing radiation. The procedure for administration of the radiopharmaceutical to the patient is one of the most critical times of exposure. In tests of myocardial perfusion scintigraphy (MPS) administration of radiopharmaceutical repeats the steps of rest and cardiac stress. In this study, we used a Geiger -Mueller detector for measuring occupational radiation doses for during the administration of technetium- {sup 99m}- sestamibi in MPS tests. In the evaluation, discriminated the stages of examination and related professional experience time to doses measures at home. It were followed 110 procedures at home (55 conducted by professionals with over 5 years experience and 55 conducted by professionals with less than 1 year of experience) and 55 effort procedures. The results showed that the rest of the procedure time and dose are related to the experience of the worker. More experienced workers were faster (mean: 43 {+-} 16 vs 67 {+-} 25 seconds / procedure), and therefore received lower doses (mean 0.57 {+-} 0.16 versus 0.80 {+-} 0.24 {mu}Sv / procedure), both with statistical significance (p <0.001). In step effort, there were procedures lasting longer (mean: 19 {+-} 2 minutes / procedure), which resulted in higher doses (mean 3.0 {+-} 0.6 {mu}Sv / procedure)

  10. Quantification of micronuclei in blood lymphocytes of patients exposed to gamma radiation for dose absorbed assessment; Quantificacao de micronucleos em linfocitos de pacientes expostas a radiacao gama para a avaliacao da dose absorvida

    Energy Technology Data Exchange (ETDEWEB)

    Barbosa, Isvania Maria Serafim da Silva

    2003-02-15

    Dose assessment in an important step to evaluate biological effects as a result of individual exposure to ionizing radiation. The use of cytogenetic dosimetry based on the quantification of micronuclei in lymphocytes is very important to complement physical dosimetry, since the measurement of absorbed dose cannot be always performed. In this research, the quantification of micronuclei was carried out in order to evaluate absorbed dose as a result of radiotherapy with {sup 60}Co, using peripheral blood samples from 5 patients with cervical uterine cancer. For this purpose, an aliquot of whole blood from the individual patients was added in culture medium RPMI 1640 supplemented with fetal calf serum and phytohaemagglutinin. The culture was incubated for 44 hours. Henceforth, cytochalasin B was added to block the dividing lymphocytes in cytokinesis. The culture was returned to the incubator for further of 28 hours. Thus, cells were harvested, processed and analyzed. Values obtained considering micronuclei frequency after pelvis irradiation with absorption of 0,08 Gy and 1,8 Gy were, respectively, 0,0021 and 0,052. These results are in agreement with some recent researches that provided some standard values related to micronuclei frequency induced by gamma radiation exposure in different exposed areas for the human body. The results presented in this report emphasizes biological dosimetry as an important tool for dose assessment of either total or partial-body exposure to ionizing radiation, mainly in retrospective dose investigation. (author)

  11. Optimization on the dose versus noise in the image on protocols for computed tomography of pediatric head; Otimizacao da relacao dose versus ruido na imagem em protocolos de tomografia computadorizada de cranio pediatrico

    Energy Technology Data Exchange (ETDEWEB)

    Saint' Yves, Thalis L.A.; Travassos, Paulo Cesar B.; Goncalves, Elicardo A.S.; Mecca A, Fernando; Silveira, Thiago B. [Instituto Nacional do Cancer (INCa), Rio de Janeiro, RJ (Brazil)], e-mail: fmecca@inca.gov.br, e-mail: thalis09@yahoo.com.br

    2010-03-15

    This article aims to establish protocols optimized for computed tomography of pediatric skull, to the Picker Q2000 tomography of the Instituto Nacional de Cancer, through the analysis of dose x noise on the image with the variation of values of mAs and kVp. We used a water phantom to measure the noise, a pencil type ionization chamber to measure the dose in the air and the Alderson Randon phantom for check the quality of the image. We found values of mAs and kVp that reduce the skin dose of the original protocol used in 35.9%, maintaining the same image quality at a safe diagnosis. (author)

  12. Comparison of absorbed dose in the cervix carcinoma therapy by brachytherapy of high dose rate using the conventional planning and Monte Carlo simulation; Comparacao da dose absorvida no tratamento do cancer ginecologico por braquiterapia de alta taxa de dose utilizando o planejamento convencional do tratamento e simulacao de Monte Carlo

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Aneli Oliveira da

    2010-07-01

    This study aims to compare the doses received for patients submitted to brachytherapy High Dose Rate (HDR) brachytherapy, a method of treatment of the cervix carcinoma, performed in the planning system PLATO BPS with the doses obtained by Monte Carlo simulation using the radiation transport code MCNP 5 and one female anthropomorphic phantom based on voxel, the FAX. The implementation of HDR brachytherapy treatment for the cervix carcinoma consists of the insertion of an intrauterine probe and an intravaginal probe (ring or ovoid) and then two radiographs are obtained, anteroposterior (AP) and lateral (LAT) to confirm the position of the applicators in the patient and to allow the treatment planning and the determination of the absorbed dose at points of interest: rectum, bladder, sigmoid and point A, which corresponds anatomically to the crossings of the uterine arteries with ureters The absorbed doses obtained with the code MCNP 5, with the exception of the absorbed dose in the rectum and sigmoid for the simulation considering a point source of {sup 192}Ir, are lower than the absorbed doses from PLATO BPS calculations because the MCNP 5 considers the chemical compositions and densities of FAX body, not considering the medium as water. When considering the Monte Carlo simulation for a source with dimensions equal to that used in the brachytherapy irradiator used in this study, the values of calculated absorbed dose to the bladder, to the rectum, to the right point A and to the left point A were respectively lower than those determined by the treatment planning system in 33.29, 5.01, 22.93 and 19.04%. These values are almost all larger than the maximum acceptable deviation between patient planned and administered doses (5 %). With regard to the rectum and bladder, which are organs that must be protected, the present results are in favor of the radiological protection of patients. The point A, that is on the isodose of 100%, used to tumor treatment, the results

  13. Disponibilidade de nitrato em solos brasileiros sob efeito da calagem e de fontes e doses de nitrogênio Nitrate availability in Brazilian soils under effect of liming and sources and amounts of nitrogen

    Directory of Open Access Journals (Sweden)

    CARLOS ALBERTO SILVA

    2000-12-01

    Full Text Available Este trabalho objetivou avaliar os efeitos da calagem e de fontes e doses de N sobre a disponibilidade de nitrato, em amostras (020 cm de solos brasileiros. Foram conduzidos dois experimentos: um com cinco solos da Bahia e o outro com cinco solos de Minas Gerais. Os materiais de solo foram previamente umedecidos e incubados por sete dias, a 26°C, visando ativar a flora microbiana. Nas amostras de solo da Bahia, aplicou-se a uréia ou o sulfato de amônio nas concentrações de 50, 100, 150 e 200 mg de N por kg de solo e nas de Minas Gerais, foi avaliado o efeito da calagem sobre a nitrificação. Os materiais de solo foram incubados a 26°C por 15 dias. Independentemente da dose de N aplicada, auréia nitrificou mais rapidamente do que o sulfato de amônio. Na Areia Quartzosa não foi observada nitrificação líquida do Nsulfato de amônio, sendo constatada, porém, a oxidação do Nuréia. A calagem afetou a nitrificação, notando-se nos solos que receberam calcário maior disponibilidade de nitrato. A saturação por bases e o teor de matéria orgânica apresentaram, respectivamente, a melhor correlação com o nitrato formado e os teores de uréia presentes no solo ao término da incubação.The aim of this work was to evaluate the effect of liming and sources and doses of nitrogen on nitrate availability in Brazilian soils. Two experiments were carried out: one with five soils from Bahia State and the other with five soils from Minas Gerais State. Soil samples were previously moistened and incubated at 26°C in order to activate the microorganism population. Soil samples from Bahia State were incubated with50, 100, 150 e 200 mg of N per kg of soil as ammonium sulfate or urea and in the Minas Gerais soils it was evaluated the effect of liming on nitrification. Soil samples were incubated at 26°C during 15 days. Urea nitrified faster than ammonium sulfate. The sandy soil did not exhibit net nitrification following ammonium application, but

  14. Evaluation of skin entrance radiation dose in pediatric patients undergoing chest X-rays exams; Avaliacao da dose de entrada na pele em pacientes pediatricos submetidos a exames radiograficos do torax

    Energy Technology Data Exchange (ETDEWEB)

    Gabardo, Farly Piantini

    2016-07-01

    The aim of this work was to estimate the incident air kerma of lateral (LAT) and anterior-posterior (AP) together with posterior-anterior (PA) projection chest X-ray exams in one of the largest pediatric hospitals in Brazil. Dosimetric results are accompanied with the detailed analysis of patient characteristics and radiographer strategy. The exams of 225 (119 male and 106 female) patients were studied and 389 X-ray exams (200 AP/PA projections and 189 LAT projections) of pediatric patients were acquired. Patient thickness can be restored from age, height or weight with the uncertainty of ∼20-30%. Very slight correlation between the patient dose and thickness was observed with the difference in dose for patients of the same thickness reaching 4 times. By standardization of radiological protocols, it should be possible to keep dose within the intervals 50-100 μGy for LAT projection and 40-80 μGy for AP/PA projection. The dose values are lower than those recommended by major European guidelines to good practice. (author)

  15. Impact of electromechanical parameter variations in treatment volume doses and adjacent structures; Impacto da variacao dos parametros eletro-mecanicos nas doses do volume de tratamento e nas estruturas adjacentes

    Energy Technology Data Exchange (ETDEWEB)

    Morais, M.E.; Campos, A.M. [Instituto Nacional do Cancer (INCa), Rio de Janeiro, RJ (Brazil). Programa de Qualidade em Radioterapia]. E-mails: memorais@yahoo.com.br; amcampos@inca.gov.br; Goncalves, J. F. [Instituto de Oncologia e Radioterapia GV, Governador Valadares, MG (Brazil)]. E-mail: joelfgoncalves@yahoo.com.br; Ferreira, M.L. [Centro Radioterapico Gavea, Rio de Janeiro, RJ (Brazil)]. E-mail: mluciaf@yahoo.com

    2003-07-01

    ICRU Report 62 recommends that radiotherapy treatment dose should be prescribed in such a way that the dose to the target volume varies no more than 10%. In order to keep this goal, a very important role is played by the quality assurance (QA) of the treatment unit associated to the high level work of the personnel involved in planning and patient treatment. This paper shows the influence of the main electrical and mechanical linear accelerator parameters: field size, source-skin distance, gantry angle and light x radiation field coincidence in tumor volume and adjacent organ doses. We simulated a cubic tumor and a cubic adjacent critical organ in a cubic phantom and used a 3D Prowess system for planning. The treatment has been simulated for a 6 MV linear accelerator. We simulated two treatment planning: one using all the parameters inside their tolerance limits and another doubling these limits. The final results have show that, if the irradiation machine operates out of the tolerance limits, the dose variation in the planning target volume (PTV) can goes till {+-} 5,8% and in the critical adjacent organ till {+-} 7,7%. Therefore we concluded that, according to the complexity of the treatment, it can be necessary to reduce the tolerance levels advised by the IAEA/TECDOC - 1151. (author)

  16. Preliminary results of the average glandular dose to the breast with TLDS measure is computed as the conversion factors; Resultados preliminares da dose glandular media na mama medida com TLDS e calculada atraves de fatores de conversao

    Energy Technology Data Exchange (ETDEWEB)

    Sardo, Luiz T.L.; Almeida, Claudio D.; Coutinho, Celia M.C., E-mail: ltsardo@yahoo.com.br, E-mail: claudio@ird.gov.br, E-mail: celia@ird.gov.br [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2013-07-01

    At mammography exams there is a risk of a breast cancer induced from the absorbed dose by the glandular tissue. According to the National Institute of Cancer, INCA, breast cancer is the second type most frequent in the world and the most common among women, therefore the necessity of monitoring the mean glandular dose, D{sub G}. Measuring methods of D{sub G} were established by some authors. Among the established methods the method of Dance is one of the most known. In this study was utilized a measurement method realized with TL dosimeters inserted in a breast tissue equivalent phantom, BTE, with 46% of glandularity and exposed using Mo/Mo and Mo/Rh target/filter combination and 28kV. To ensure this measurement method the results were compared with a calculation method, used by Dance, of D{sub G} from the measurement of incident air kerma, K{sub i}, and conversion factors to consider mainly the beam quality, the compressed thickness and the glandularity of the breast. The results of the comparison of the D{sub G} measurement with the obtained dose by the method of Dance demonstrated that for the thickness of 4.0 and 6.0 cm the doses were consistent. For the thickness of 5.0 cm the difference was higher, indicating that the glandularity may influence, suggesting further investigation. (author)

  17. Ionizing radiation dose control for workers in a nuclear plant working with unsealed sources; Controle da dose de radiacao ionizante para trabalhadores em uma instalacao radiativa com fontes nao seladas

    Energy Technology Data Exchange (ETDEWEB)

    Gerulis, Eduardo

    2006-07-01

    With the liberation of the use of the nuclear energy for peaceful applications, International Commission Radiological Protection, ICRP, founded in 1928, created a system of protection of the undesirable doses of ionizing radiation in 1958. This has been received by workers, members of the public and environment and hence it became possible for the introduction of these applications. This protection system is adopted by the International Agency of Energy Atomic, IAEA, that publishes recommendations in safety series, 88 and by the Comissao Nacional de Energia Nuclear, CNEN, which publishes these regulations. The international recommendations and national regulations were adapted and they need to be applied in this way. The present paper uses recommendations of the publication 75 from ICRP, of the publication 115 from 88 and regulations of the regulation NN 3.01 from CNEN to present, through radiological protection measures, the ionizing radiation dose control for workers in a nuclear plant that works in the research, production, division and packing of unsealed sources to be used in clinical applications. In that way it is possible to prevent appropriately the undesirable doses and to confirm the received doses. (author)

  18. Correlação entre métodos de avaliação da qualidade da dose de diálise La correlación entre los métodos de evaluación de la calidad de la dosis de diálisis Comparison between two methods for evaluation of the dialysis dose quality

    Directory of Open Access Journals (Sweden)

    Kelly Cristina Inoue

    2009-01-01

    Full Text Available OBJETIVO: Verificar a correlação entre o Kt/V calculado e o Kt/V-OCM. MÉTODOS: Estudo transversal, retrospectivo, com 14 pacientes submetidos a 106 hemodiálises com a máquina Fresenius 4008S, realizado numa Unidade de Terapia Intensiva para adultos, de um Hospital de Ensino do noroeste do Paraná, no período de novembro/2007 a abril/2008. RESULTADOS: Através do teste de Shapiro-Wilk, (p>0,05, foi constatado que não houve distribuição normal entre o "Kt/V calculado" e o "Kt/V da máquina". CONCLUSÃO: Pelo teste de Wilcoxon concluiu-se que houve diferença significativa (pOBJETIVO: Verificar la correlación entre el Kt/V calculado y el Kt/V-OCM. MÉTODOS: Estudio transversal, retrospectivo, con 14 pacientes sometidos a 106 hemodiálisis con la máquina Fresenius 4008S, realizado en una Unidad de Cuidados Intensivos para adultos, de un Hospital Docente del noroeste del Paraná, en el período de noviembre/2007 a abril/2008. RESULTADOS: A través del test de Shapiro-Wilk, (p>0,05, se constató que no hubo distribución normal entre el "Kt/V calculado" y el "Kt/V de la máquina". Por el test de Wilcoxon hubo diferencia significativa (pPURPOSE: To compare calculated Kt/V and Kt/V-OCM methods of dialysis dose. METHODS: This was a cross-sectional retrospective study with 14 patients who underwent 106 hemodialysis using Fresenius 4008S dialysis machine in the critical care unit of the "Noroeste Parana Teaching Hospital" from November 2007 to April 2008. RESULTS: Shapiro-Wilk test indicated that there was no normal distribution between the calculated Kt/V and the machine Kt/V (p>0.05. Wilcoxon test showed a statistically significant difference between the two measurements (p <.0001. CONCLUSION: There is a need for further studies that consider all factors involved with the online calculation of the urea depuration for the utilization of the Kt/V-OCM.

  19. Produtividade da biomassa de melissa em função de intervalo de cortes e doses de nitrogênio Biomass production of Lemon balm as a result of cutting interval and nitrogen levels

    Directory of Open Access Journals (Sweden)

    André May

    2008-09-01

    Full Text Available A espécie Melissa officinalis tem crescido em importância econômica no setor produtivo de plantas medicinais, contudo o nível de informações agronômicas a cerca da espécie é limitado. Dessa forma, foi instalado um experimento visando avaliar a influência do intervalo de cortes e de doses de nitrogênio sobre a produção de biomassa dessa espécie. O delineamento experimental utilizado foi o de blocos ao acaso, com três repetições, em esquema fatorial 4 x 4, sendo os fatores estudados o intervalo de cortes (30; 42; 54 e 66 dias e dose de nitrogênio (0; 60; 120 e 180 kg ha-1 de N. Foram avaliadas a altura da planta e massa seca da parte aérea. Observou-se maior altura da planta para maior intervalo entre corte. Maiores rendimentos de massa seca foram observados com a aplicação de 180 kg ha-1 de N, havendo uma resposta linear para a produção de massa seca com a aplicação de N.Cultivation of Melissa officinalis is increasing in economic importance in the market of medicinal plants, although the level of agronomic information concerning the specie is limited. To achieve those objectives, a trial was carried out to study the influence of cutting intervals and nitrogen levels in biomass production. The experimental design was in blocks with three replications in a 4 x 4 factorial cheme: cutting intervals (30; 42; 54 and 66 days and nitrogen (0; 60; 120 and 180 kg ha-1 of N. The characteristics of plant height and aerial part and accumulated dry mater were evaluated. Increasing the cutting intervals resulted in higher plants. The highest dry matter value was observed using 180 kg ha-1 of N, having a linear reply for the production of dry mass with the application of N.

  20. Use of the gamma radiation, in a dose of 0,4 kGy, on the storage temperature reduction of the banana nanica;Utilizacao da radiacao gama, na dose de 0,4kGy, na reducao da temperatura de armazenamento da banana nanica

    Energy Technology Data Exchange (ETDEWEB)

    Manoel, Luciana, E-mail: luciana_manoel@yahoo.com.b [Universidade Estadual Paulisa (UNESP), Botucatu, SP (Brazil). Fac. de Ciencias Agronomicas. Programa de Pos-graduacao em Energia na Agricultura; Vieites, Rogerio Lopes, E-mail: vieites@fca.unesp.b [Universidade Estadual Paulisa (UNESP), Botucatu, SP (Brazil). Fac. de Ciencias Agronomicas. Dept. de Gestao e Tecnologia Agroindustrial

    2009-07-01

    The aim was to evaluate the use of gamma radiation, in a dose of 0,4 kGy, on the storage temperature reduction of the banana 'Nanica'. The bananas 'Nanica' were harvested in the Arm Taperao, Brotas (SP) town, and sent to CBE (Companhia Brasileira de Esterilizacao-Cotia-SP) for irradiation and constitution of the following treatments: T1 (fruits irradiated at 0,4 kGy and stored at 16 +-1 deg C); T2 (fruits irradiated at 0,4 kGy and stored at 14 +-1 deg C); T3 (fruit irradiated ata 0,4 kGy and stored at 12+-1 deg C); T4 (fruits non-irradiated and stored at 16+-1 deg C); T5 (fruits non-irradiated and stored at 14+-1 deg C) and T6 (fruits non-irradiated and stored at 12+-1 deg C). The fruits were stored in B.O.Ds. of the Agroindustrial Management and Technology Department, with a relative humidity of 80+-5%. The experiment was divided in two groups: control group (post harvest conservation and disease incidence) and parcel group (soluble solids and pulp/peel). The analyses were performed in intervals of five days during a period of 25 days. The experimental design employed was completely randomized (DIC) by applying a factor of 2 x 3 x 6 (irradiation x temperature x time). The Tukey test with 5% of probability was used for comparison between means. The storage temperature of the bananas 'Nanica' was not reduce by irradiation. (author)

  1. Production and bromatologic composition of grass-mombaça (Panicum maximum Jacq., submitted to different sources and doses of acidity corrective / Produção e composição bromatológica da forragem do capim-mombaça (Panicum maximum Jacq., submetidos a diferentes fontes e doses de corretivo de acidez

    Directory of Open Access Journals (Sweden)

    Francisco Maximino Fernandes

    2010-04-01

    Full Text Available The experiment was carried in protected (greenhouse atmosphere, in University of Engineering, UNESP of Ilha Solteira-SP, with the objective of evaluating sources (limestone and calcium silicate slag and doses (0,0 – 0,5 – 1,0 – 1,5 – 2,0 times the recommended dose of corrective in the bromatologic composition, tillering and production of dry matter of the grass mombaça (Panicum maximum Jacq.. The lineation was completely randomized design, with four repetitions. It was evaluated the tiller number, the production of dry matter, the gross protein, neutral detergent fiber (NDF and acid detergent fiber (ADF. The corrective influenced the tillering in almost all of the countings. The limestone provided larger production of dry matter in the doses of 1,5 and 2,0 times the recommended dose. The bromatologic composition of the forage was not influenced by the corrective and doses.O experimento foi conduzido em ambiente protegido (estufa, na Faculdade de Engenharia, UNESP de Ilha Solteira, com o objetivo de avaliar fontes (calcário e escória silicatada e doses (0,0 – 0,5 – 1,0 – 1,5 – 2,0 vezes a dose recomendada de corretivos na composição bromatológica, perfilhamento e produção de matéria seca do capim-mombaça (Panicum maximum Jacq.. O delineamento experimental utilizado foi inteiramente casualizado, com quatro repetições. Avaliou-se o número de perfilhos, a produção de matéria seca e os teores de proteína bruta (PB, fibra em detergente neutro (FDN e fibra em detergente ácido (FDA. Os corretivos influenciaram o perfilhamento em quase todas as contagens. O calcário proporcionou maior produção de matéria seca nas doses de 1,5 e 2,0 vezes a dose recomendada. A composição bromatológica da forragem não foi influenciada pelos corretivos e doses utilizadas.

  2. Safety analysis for the Abadia de Goias repository: alternative evaluation of the ingestion dose rate critical distance; Analise de seguranca para o repositorio de Abadia de Goias: avaliacao alternativa da distancia critica de taxa de dose de ingestao

    Energy Technology Data Exchange (ETDEWEB)

    Martin Alves, A.S. de; Passos, E.M. dos [NUCLEN, Rio de Janeiro, RJ (Brazil)

    1995-12-31

    An alternative calculation of the ingestion dose rate critical distance due to a hypothetical release of Cs-137 from the structure of the Repository of Abadia de Goias is presented. The release pathway considers the repository - groundwater region - well - and food chain. The main adopted modification comparing to the previous work is the inclusion of the convective and molecular diffusion terms in the radionuclide transport equation in addition to the radioactive decay term. (author). 6 refs, 1 tab.

  3. Comparison of absorbed dose of two protocols of tomographic scanning in PET/CT exams; Comparação da dose absorvida de dois protocolos de varredura tomográfica em exame de PET-CT

    Energy Technology Data Exchange (ETDEWEB)

    Paiva, F.G., E-mail: fgpaiva92@gmail.com [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Dept. de Engenharia Nuclear; Santana, P.C. [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Faculdade de Medicina; Mourão Filho, A.P. [Centro Federal de Educação Tecnológica de Minas Gerais (CEFET-MG), Belo Horizonte, MG (Brazil)

    2017-07-01

    Positron Emission Tomography (PET) associated with Computed Tomography (CT) allows the fusion of functional and anatomical images. When compared to other diagnostic techniques, PET-CT subjects patients to higher levels of radiation, because two modalities are used in a single exam. In this study, the doses absorbed in 19 patient organs from the tomographic scan were evaluated. Radiochromic films were correctly positioned in the Alderson anthropomorphic simulator, male version. For evaluation, two whole body scan protocols were compared. For evaluation, two whole body scan protocols were compared. An increase of up to 600% in the absorbed dose in the pituitary was observed when the protocols were compared, with the lowest observed increase of approximately 160% for the liver. It is concluded that the dose from CT in patients submitted to PET-CT scanning is higher in the protocol used for diagnosis. Considering the high cost of PET-CT exam, in many cases it is preferable that the CT examination is of diagnostic quality, and not only for anatomical mapping, an argument based on the Principle of Justification.

  4. Development of methodology for assessment of absorbed dose and stopping power for low energy conversion electrons; Desenvolvimento de uma metodologia para estimativa da dose absorvida e do poder de freamento para eletrons de conversao de baixa energia

    Energy Technology Data Exchange (ETDEWEB)

    Almeida, Ivan Pedro Salati de

    1995-08-01

    The evaluation of absorbed dose in the case of external and internalcontamination due to radionuclides is sometimes hard, because of the difficulties in the assessment of the absorbed dose caused by electrons with energy less than 100 KeV in mucous membrane. In this work, a methodology for assessment of absorbed dose and stopping power in VYNS (co-polymer of polivinyl chloride - acetate) absorbers, for the 62.5 KeV and 84-88 KeV energy {sup 109} Cd conversion electrons, working with a 4 {pi} proportional pressurized detector, is presented. In order to assure the reproducibility of measurement conditions, one of the detector halves has been used to obtain a spectrum of a thin {sup 109} Cd source, without absorber. The other half of the detector was used in concomitance to obtain spectra with different thicknesses if absorber. The absorbed energy was obtained subtracting each spectrum with absorber from the spectrum without absorber, which were stored in a microcomputer connected to signal processing systems by ACE type interface. The VYNS weight and thickness were evaluated using common radionuclide metrology procedures. As VYNS has characteristics similar to a tissue equivalent material, the results obtained are consistent with dosimetric concepts and have a good agreement with those of the literature. (author)

  5. Collective dose estimation in Portuguese population due to medical exams of diagnostic radiology and nuclear medicine; Estimativa da dose coletiva na populacao portuguesa devido a exames medicos de radiologia de diagnostico e de medicina nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Teles, Pedro; Vaz, Pedro [Instituto Tecnologico e Nuclear, Sacavem (Portugal). Instituto Superior Tecnico; Sousa, M. Carmen de [Instituto Portugues de Oncologia de Coimbra (Portugal); Paulo, Graciano; Santos, Joana [Escola Superior de Tecnologia da Saude de Coimbra (Portugal); Pascoal, Ana [Kings College Hospital, London (United Kingdom). Kings Health Partners; Cardoso, Gabriela; Santos, Ana isabel [Hospital Garcia de Orta, Almada (Portugal); Lanca, Isabel [Administracao Regional de Saude, Coimbra (Portugal); Matela, Nuno [Universidade de Lisboa (Portugal). Fac. de Ciencias. Instituto de Biofisica e Engenharia Biomedica; Janeiro, Luis [Escola superior de Saude da Cruz Vermelha Portuguesa, Lisboa (Portugal); Sousa, Patrick [Laboratorio de Instrumentacao e Fisica Experimental de Particulas, Lisboa (Portugal); Carvoeiras, Pedro; Parafita, Rui [Medical Consult, SA, Lisboa (Portugal); Simaozinho, Paula [Administracao Regional de Saude, Faro (Portugal)

    2013-11-01

    In order to assess the exposure of the Portuguese population to ionizing radiation due to medical examinations of diagnostic radiology and nuclear medicine, a working group, consisting of 40 institutions, public and private, was created to evaluation the coletive dose in the Portuguese population in 2010. This work was conducted in collaboration with the Dose Datamed European consortium, which aims to assess the exposure of the European population to ionizing radiation due to 20 diagnostic radiology examinations most frequent in Europe (the 'TOP 20') and nuclear medicine examinations. We obtained an average value of collective dose of Almost-Equal-To 1 mSv/caput, which puts Portugal in the category of countries medium to high exposure to Europe. We hope that this work can be a starting point to bridge the persistent lack of studies in the areas referred to in Portugal, and to enable the characterization periodic exposure of the Portuguese population to ionizing radiation in the context of medical applications.

  6. The effect of prophylactic dose of a low molecular weight heparin on skin wound healing of rats Efeito da dose profilática de heparina de baixo peso molecular na cicatrização de feridas na pele de ratos

    Directory of Open Access Journals (Sweden)

    Ozdamar Fuad Oken

    2009-12-01

    Full Text Available PURPOSE: To investigate the effect of prophylactic dose of a low molecular weight heparin, enoxaparin, on skin wound healing of rats. METHODS: Forty rats were used for the study. Rats were randomly assigned to two equal groups. Experimental group received prophylactic dose of enoxaparin. Physiologic saline was administered to the control group. Parameters of wound healing of experimental and control groups were compared. For comparison of the groups in terms of fibrosis, vascularization, inflammation, epithelization, and tensile strength test (Newton. Mann-Whitney-U test was used because variables were categorical data (fibrosis, vascularization, inflammation and epithelization. Differences between groups were analyzed with independent samples t-test (tensile strength. Significance was set at pOBJETIVO: Investigar o efeito de dose profilática da heparina de baixo peso molecular, enoxaparina, na cicatrização de feridas na pele de ratos. MÉTODOS: Quarenta ratos foram utilizados para o estudo. Ratos foram distribuídos aleatoriamente a dois grupos iguais. O grupo experimental recebeu profilática de enoxaparina. Solução salina fisiologica foi administrada ao grupo controle. Foram comparados parâmetros de cicatrização dos grupos experimental e controle.Os grupos foram comparados em termos de fibrose, vascularização, inflamação, epitelização e força tensil (teste de Newton. Foi realizado o teste de Mann-Whitney-U para variáveis com dados categóricos (fibrose, cicatrização, inflamação e epitelização. Diferenças entre os grupos foram analisadas como amostras independentes pelo t-teste (força tensil. Significância foi fixada para p < 0,05. RESULTADOS: A ferida do grupo experimental apresentou força tensil diminuída significativamente (p < 0,001, o exame histopatológico revelou um significativo (p < 0,001 retardo na epitelização e diminuição na fibrose, cicatrização, inflamação (p < 0,001 no grupo experimental

  7. Radiolesão vascular como efeito deletério da braquiterapia intra-arterial com dose elevada de Samário-153 em coelhos hipercolesterolêmicos Vascular radiolesion as a deleterious effect of high-dose-rate intraarterial brachytherapy with Samarium-153 in hypercholesterolemic rabbits

    Directory of Open Access Journals (Sweden)

    Dalton Bertolim Précoma

    2006-10-01

    Full Text Available OBJETIVO: Este estudo tem por objetivo avaliar as alterações vasculares morfológicas e morfométricas induzidas pela braquiterapia com Samário-153 (153 Sm em coelhos hipercolesterolêmicos, com doses elevadas. MÉTODOS: Foram analisados 43 coelhos hipercolesterolêmicos, brancos, da raça New Zealand, e o total de 86 artérias ilíacas submetidas a lesão por balão de angioplastia. Divididos em três grupos: dois (GI irradiados com as doses de 15Gy (n=14 e 60Gy (n=36 e um grupo controle (n=36. Foram realizadas avaliação histológica morfométrica e análise histológica qualitativa para análise tecidual. RESULTADOS: Foram observadas uma redução significativa da neoproliferação intimal (NPI no GI 15 Gy (pOBJECTIVE: This study was designed to evaluate vascular morphological and morphometric changes induced by brachytherapy with samarium-153 (Sm-153 at high doses in hypercholesterolemic rabbits. METHODS: Forty-three New Zealand White hypercholesterolemic rabbits were analyzed, and the total of 86 iliac arteries underwent balloon angioplasty injury. The rabbits were divided into three different groups: two irradiation groups (IG assigned to 15 Gy (n=14 and 60 Gy (n=36 irradiation doses, respectively, and a control group (n = 36. Histomorphometric and qualitative histological analyses were performed for tissue evaluation. RESULTS: Significant reductions were found in neointimal proliferation (NIP (p< 0.0001, media area (MA (p<0.0001 and percent stenosis (p<0.0001 in the 15-Gy IG, compared to the other groups. The 60-Gy IG had the higher rate of NIP, increase in media and vessel areas (VA and percent stenosis. The 60-Gy IG also showed the greatest number of xanthomatous cells (60-Gy IG: 86.11% and 15-Gy IG: 14.29%, p<0.0001 and the highest amount of hyaline amorphous tissue (60-Gy IG:58.33% and 15-Gy IG:0%, p=0.0001 and vascular proliferation (60-Gy IG:30.56% and 15-Gy IG:0%, p=0.0221. No statistically significant differences were found

  8. Trace element determination study in human hair by neutron activation analysis; Estudo da determinacao de elementos traco em cabelos humanos pelo metodo de analise por ativacao com neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Frazao, Selma Violato

    2008-07-01

    Human hair analysis studies have been subject of continuous interest due to the fact that they can be used as an important tool to evaluate trace element levels in the human body. These determinations have been carried out to use hair for environmental and occupational monitoring, to identify intoxication or poisoning by toxic metals, to assess nutritional status, to diagnose and to prevent diseases and in forensic sciences. Although hair analysis presents several advantages over other human tissue or fluid analyses, such as organ tissue, blood, urine and saliva, there are some controversies regarding the use of hair analysis data. These controversies arise from the fact that it is difficult to establish reliable reference values for trace elements in hair. The purpose of this study was to evaluate the factors that affect element concentrations in hair samples from a population considered healthy and residing in the Sao Paulo metropolitan area. The collected human head hair was cut in small pieces, washed, dried and analyzed by neutron activation analysis (NAA). Aliquots of hair samples and synthetic elemental standards were irradiated at the IEA-R1 nuclear research reactor for 16 h under a thermal neutron flux of about 5x10{sup 12} n cm{sup -2} s{sup -1} for As, Br, Ca, Co, Cr, Cs, Cu, Fe, K, La, Na, Sb, Sc, Se and Zn determinations. The induced gamma activities of the standards and samples were measured using a gamma ray spectrometer coupled to an hiperpure Ge detector. For quality control of the results, IAEA- 85 Human Hair and INCT-TL-1 Tea Leaves certified reference materials (CRMs) were analyzed. Results obtained in these CRMs presented for most of elements, good agreement with the values of the certificates (relative errors less than 10%) and good precision (variation coefficients less than 13.6%). Results of replicate hair sample analysis showed good reproducibility indicating homogeneity of the prepared sample. Results obtained in the analyses of dyed and non-dyed hair showed that element adsorption or desorption occurs due to the dye. Analysis of hair samples collected from different regions of the head presented significant differences for the elements Fe, Sc, Se and Cr, indicating the importance of defining head regions for hair sample collection. Results of hair analysis from individuals residing in Sao Paulo metropolitan area showed individual differences for age, gender and natural hair color. Results obtained in this population also showed, that the mean element concentrations found are within the literature values. (author)

  9. Determination of permeability to gases of concrete used as repository for radioactive wastes; Determinacao da permeabilidade a gas em concreto usado em repositorios para rejeitos radioativos

    Energy Technology Data Exchange (ETDEWEB)

    Miyake, Eloisa Tamie

    1994-12-31

    Concrete is widely used in final radioactive waste repository construction and must have well defined characteristics. The permeability is a property that allows to evaluate the durability of concrete which guarantee the protection of the surroundings. Durable concretes have low permeability which reduces liquids intrusion into the repository and decreases the probability of leaching of soluble radioactive compounds and gases escapes to the human habitat. This work includes: the construction of a camera to measure the permeability coefficient of hydraulic products, by using gaseous nitrogen as a permeation fluid; determination of characteristics of material used in concrete compositions; and tests in concretes with different compositions in which ordinary Portland cement and blast-furnace cement were used. (author). 61 refs., 33 figs., 16 tabs.

  10. Falling hammer use evaluation for hot deformation hardness testing; Avaliacao do uso de um martelo de queda, para a determinacao da resistencia a deformacao a quente

    Energy Technology Data Exchange (ETDEWEB)

    Beck, J.C.P.C.; Cauduro, Carlos R.; Schaeffer, Lirio [Rio Grande do Sul Univ., Porto Alegre, RS (Brazil)

    1990-12-31

    This work performs a evaluation of the characteristics hot leaking of a 8620 stainless steel, deformed at 870 deg C. The tools associated with the measurements was described and a comparison between the theoretical values and the values experimentally obtained from the performed tests. 5 figs., 3 refs.

  11. Uncertainty determination in a custody transfer operation from vertical cylinder storage tanks; Determinacao da incerteza do volume transferido em tanques cilindricos verticais

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Elcio C.; Ferreira, Ana Luisa A.S. [TRANSPETRO - PETROBRAS Transporte S.A., Rio de Janeiro, RJ (Brazil); Orlando, Alcir F.; Val, Luiz G. do [Pontificia Univ. Catolica do Rio de Janeiro, RJ (Brazil)

    2004-07-01

    The INMETRO/ANP 1 regulation (2000), presents rules to be followed for measuring and calibrating cylindrical vertical oil storage tanks in Brazil, according to ISO 7507-1 (1993) standard. A methodology for estimating the uncertainty (95,45 % confidence level) of the volume in a custody transfer process was developed, based on ISO GUM (1998) standard. The strapping method was selected for this study, because it has been used as a standard procedure by INMETRO. In this study, the same uncertainty values, as suggested by the standard, were used to estimate the uncertainty of the liquid volume in the tank. This study showed that the uncertainty of the transferred liquid volume from the tank varies from 0,2% to 0,4%, being smaller for larger volumes, which is thus the recommended application. The uncertainty of the ring height measurement is the largest contribution to the volume measurement uncertainty, and, thus, must be accurately measured. The tank internal diameter uncertainty is a small contribution to it. This paper calculates the uncertainty of liquid volume transferred from the tank by three methods, namely, this paper's, ISO 7507- 1's and INMETRO's, and shows that the most important contribution to the measurement uncertainty is the density measurement uncertainty, which must be accurately measured, at least, to within {+-} 0,0005, if the volume uncertainty is to remain in the 0,5 % to 1 % range. (author)

  12. Determination of threshold shear stress to drag particles in cuttings bed; Determinacao da tensao de cisalhamento minima para arraste de particulas em um leito fluidizado

    Energy Technology Data Exchange (ETDEWEB)

    Loureiro, Bruno Venturini; Siqueira, Renato do Nascimento [Faculdade do Centro Leste (UCL), Serra, ES (Brazil). Lab. de Fenomenos de Transporte], e-mail: brunovl@ucl.br, e-mail: renatons@ucl.br

    2006-07-01

    Drilling of horizontal wells for oil and gas production needs an efficient cleaning process due to settling of particles removed during the drilling process, which settles on the inferior part of the annular space between the drilling column and the walls of the well. The erosion of the bed is an important physical phenomenon to petroleum and gas industry since it can improve the opening of the wells. This work aims to estimate the threshold shear stress necessary to start the erosion process in a sediment bed. An experimental apparatus was built from simplifications of the problem in order to measure the flow rate and identify the beginning of the process. The experiment consists of a rectangular duct with aspect ratio ({lambda} = h/b) of 1/3 and non dimensional length (L{sup *} = L/h) of 75. The sediment bed to be eroded was placed at 60< x{sup *}<66. Using the flow rate and the boundary conditions, a discretization of the problem was carried out to permit a computational solution using the finite volume method and hence, determine the shear stress. This work used particles with up to 3.0 mm and modeled the flow considering a bed with equivalent roughness. (author)

  13. Determination of the most reactivity control rod by pseudo-harmonics perturbation method; Determinacao da barra de controle mais reativa usando o metodo de pseudo-harmonicos

    Energy Technology Data Exchange (ETDEWEB)

    Freire, Fernando S.; Silva, Fernando C.; Martinez, Aquilino S. [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia. Programa de Engenharia Nuclear]. E-mail: ffreire@con.ufrj.br; fernando@con.ufrj.br; aquilino@.con.ufrj.br

    2005-07-01

    Frequently it is necessary to compute the change in core multiplication caused by a change in the core temperature or composition. Even when this perturbation is localized, such as a control rod inserted into the core, one does not have to repeat the original criticality calculation, but instead we can use the well-known pseudo-harmonics perturbation method to express the corresponding change in the multiplication factor in terms of the neutron flux expanded in the basis vectors characterizing the unperturbed core. Therefore we may compute the control rod worth to find the most reactivity control rod to calculate the fast shutdown margin. In this thesis we propose a simple and precise method to identify the most reactivity control rod. (author)

  14. SAXS determination of the structural periodicity of thermoplastic polyurethane reinforced with cellulose nanocrystals; Determinacao da perodicidade estrutural de poliuretano termoplastico reforcado com nanocristais de celulose por SAXS

    Energy Technology Data Exchange (ETDEWEB)

    Prataviera, Rogerio; Bretas, Rosario E.S.; Lucas, Alessandra de A., E-mail: lucas@ufscar.br [Universidade Federal de Sao Carlos, (UFSCar), Sao Carlos, SP (Brazil); Poullet, Eric; Averous, Luc [Universidade de Strasbourg, Strasbourg (France)

    2015-07-01

    In this work, casting films were obtained from TPU reinforced with cellulose nanocrystals. The structural nano periodicity of these system was evaluated by Small Angle X-Ray Scattering, SAXS. The results indicated that the used TPU has a atypical phase separated morphology of rigid and soft segments, being observed 3 different distances them, probably due to the large polyol polyester molecule derived from colza oil used in the TPU synthesis. (author)

  15. Determination of high molecular mass compounds from Amazonian plant's leaves; Determinacao de compostos de massa molecular alta em folhas de plantas da Amazonia

    Energy Technology Data Exchange (ETDEWEB)

    Siqueira, Denilson Soares de; Pereira, Alberto dos Santos; Aquino Neto, Francisco Radler de [Universidade Federal, Rio de Janeiro, RJ (Brazil). Inst. de Quimica]. E-mail: ladetec@iq.gov.br; Cabral, Jose Augusto; Ferreira, Carlos Alberto Cid [Instituto Nacional de Pesquisas da Amazonia (INPA), Manaus, AM (Brazil); Simoneit, Bernd R.T. [Oregon State Univ., Corvallis, OR (United States). College of Oceanic and Atmospheric Sciences. Petroleum and Environmental Geochemistry Group; Elias, Vladimir O. [Analytical Solution, Rio de Janeiro, RJ (Brazil)

    2003-10-01

    The fractions of dichloromethane extracts of leaves from andiroba (Carapa guianensis - Meliaceae), caapi (Banisteriopsis caapi - Malpighiaceae), cocoa (Theobroma cacao - Sterculiaceae), Brazil nut (Bertholletia excelsa - Lecytidaceae), cupuacu (Theobroma grandiflorum - Sterculiaceae), marupa (Simaruba amara - Simaroubaceae) and rubber tree (Hevea brasiliensis - Euphorbiaceae), were analyzed by HT-HRGC and HT-HRGC-MS. Esters of homologous series of fatty acids and long chain alcohols, phytol, amyrines and tocopherols were characterized. The characterization of the compounds was based mainly in mass spectra data and in addition by usual spectrometric data ({sup 1}H and {sup 13}C NMR, IR). (author)

  16. Methodology to determine the efficiency of a beta emitter gases monitor; Metodologia para determinacao da eficiencia de um monitor de gases emissores de particulas beta

    Energy Technology Data Exchange (ETDEWEB)

    Carvalho, Marcos Rodrigues de

    1995-07-01

    This work presents a methodology developed to determinate the efficiency of air monitors used to measure the concentration of beta emitters noble gases in nuclear power stations. Efficiency values, obtained by means of theoretical computation are compared with experimental values. The experimental part of the work was performed using three different point beta source, to simulate small amounts of gas uniformly distributed in small volume. The comparison shows that theoretical an experimental values agree within 4,2 % for {sup 90}Sr + {sup 90}Y, {sup 204}Tl and {sup 45}Ca beta sources. (author)

  17. Determination of acoustoelastic constant in API-5L-X70 welded pipes; Determinacao da constante acustoelastica de tubos API-5L-X70 com solda

    Energy Technology Data Exchange (ETDEWEB)

    Bittencourt, Marcelo de Siqueira Queiroz; Fonseca, Manoel Antonio da Costa [Instituto de Engenharia Nuclear (IEN/CNEN-RJ), Rio de Janeiro, RJ (Brazil); Oliveira, Carlos Henrique Francisco de [PETROBRAS S.A., Rio de de Janeiro, RJ (Brazil)

    2008-07-01

    To preserve the environment and avoid financial losses resulting from leaks in the transport of natural oil and gas the industry is particularly concerned to ensure the structural integrity of their pipelines. Grounded pipes may be exposed to damages due to unstable soil movement, and in extreme cases, to failure. Then, techniques to assess stress in pipelines are of central importance. The ultrasonic birefringence technique is an efficient method to measure residual stress. It is based on the changing velocity of the shear wave when it crosses a material under stress; this phenomenon is known as acoustoelasticity. The knowledge of the parameter called acoustoelastic constant is necessary to measure stress using this technique. By the mechanical conformation in the manufacture of welded tubes, from rolled plates, different anisotropy degrees are showed around the cross section of these tubes. In this paper it was studied the acoustoelastic constant for the API-5L-X70 steel pipes, with different thicknesses, diameters and manufacturing processes so as to be able to use this technique to stress measurement in pipelines. (author)

  18. Determination of the composition of a mixture of polar substances by NMR; Determinacao da composicao de uma mistura de substancias polares por espectrometria de ressonancia magnetica nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Teixeira, Antonio C.F.; Silva, Antonio J.R. da [Universidade Federal, Rio de Janeiro (Brazil). Nucleo de Pesquisas de Produtos Naturais

    1994-12-31

    This work describes the process of analysis of a mixture of polar compounds obtained from the extract of Phyllanthus tennellus, a plant known in Brazil as `quebra-pedra`, which is extensively used in Brazilian popular medicine. The methodology, which includes the use of chromatography and NMR, is described. The proposed composition of the mixture is presented. A discussion is presented concerning one component which could not be identified

  19. Determining the amount of anhydrous alcohol evaporated in vertical cylindrical tanks; Determinacao da quantidade de alcool etilico anidro evaporado em tanques cilindricos verticais

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Elcio Cruz de [TRANSPETRO - PETROBRAS Transporte S.A., Rio de Janeiro, RJ (Brazil)

    2008-07-01

    In order to assess the anhydrous alcohol evaporated amount in vertical cylindrical tanks was developed a calculation methodology based on the rate of mass transfer of the product, the Reynolds number and the mass transfer coefficient. An Excel spreadsheet was prepared with data entry of the tank and physical and chemical properties of the product (temperature and density). For a temperature of 50 deg C, the volume evaporated reaches values of 0.8% by day. (author)

  20. Application of activation analysis for determination of some elements in cassiterite samples; Aplicacao da analise por ativacao para a determinacao de alguns elementos em amostras de cassiterita

    Energy Technology Data Exchange (ETDEWEB)

    Armelin, Maria Jose Aguirre

    1978-07-01

    This work consists in the development of an analytical method using activation by thermal neutrons for the determination of some minor elements and traces present in cassiterite (tin ore). This method was then applied to determine these elements in samples of cassiterite from different regions of Brazil. An analysis was made of the mineralogy characteristic of cassiterite as well as of the minerals most commonly associated with it. Four main types of interference were found to occur in the analysis by activation of trace elements in samples of cassiterite. The method involves the analysis without chemical separation for the determination of some elements and the analysis with chemical separation for the determination of other elements. The steps involved in both types of analysis are described. In the analysis with chemical separation the matrix element (tin) is separated by distillation in an H{sub 2}SO{sub 4}-HBr medium, after fusion of the ore with Na{sub 2}O{sub 2}. Arsine and antimony are determined in the distilled, whereas some lanthanide elements and uranium are determined in the distillation residue by separating them as a group by precipitation with lanthanum fluoride. A discussion on the precision, accuracy and sensibility of the method is also included. (author)

  1. Methodology for determination of activity of radionuclides by gamma spectrometry; Metodologia para determinacao da atividade de radionuclideos por sistema de espectrometria gama

    Energy Technology Data Exchange (ETDEWEB)

    Fragoso, Maria da Conceicao de Farias; Oliveira, Victor Rogerio S. de; Oliveira, Mercia L.; Lima, Fernando Roberto de Andrade, E-mail: mariacc05@gmail.com [Centro Regional de Ciencias Nucleares do Nordeste (CRCN-NE/CNEN-NE), Recife, PE (Brazil)

    2014-07-01

    Due to the growth in the number of procedures that make use of the positron emission tomography (PET), there is a need for standard solutions for the calibration of the systems used for the measurement of the PET radiopharmaceutical (activimeter) in radiopharmacies and in nuclear medicine services. Among the existing alternatives for the standardization of radioactive sources, the method known as gamma spectrometry is widely used for short-lived radionuclides. The purpose of this study was to implement the methodology for standardization of the {sup 18}F solutions by gamma spectrometry at the Regional Center for Nuclear Sciences of the Northeast (CRCN-NE/CNEN-NE), Brazil. (author)

  2. Determination of Ra natural isotopes in marine samples from Itamaraca coastal regions; Determinacao de isotopos naturais de Ra em amostras costeiras da regiao de Itamaraca (PE)

    Energy Technology Data Exchange (ETDEWEB)

    Silveira, Patricia B.; Valentim, Eliane; Lima, Ricardo A. [Centro Regional de Ciencias Nucleares (CRCN), Recife, PE (Brazil)]. E-mail: pbrandao@cnen.gov.br; Medeiros, Carmem [Pernambuco Univ., Recife, PE (Brazil). Dept. de Oceanografia; Oliveira, Joselene [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)

    2005-07-01

    Groundwater plays an important role in the transport of nutrients and pollutants to the coastal marine environment s and other surfaces water. Concentrations of {sup 223}Ra, {sup 224}Ra and {sup 226}Ra in marine water of the Itamaraca coastal region, PE, were measured during the winter of 2004, aiming to investigate the presence of radionuclides as a tracer of submarine groundwater discharges (SGD) in the environment studied. Measurements of temperature, salinity and nutrients were also carried out. (author)

  3. Severidade da mela da soja causada por Rhizoctonia solani AG-1 IA em função de doses de potássio Severity of hte foliar blight of the soylean caused by Rhizoctonia solani AG-1 IA infunction of doses of potassium

    Directory of Open Access Journals (Sweden)

    Marco Antonio Basseto

    2007-03-01

    Full Text Available O fungo Rhizoctonia solani pertencente ao grupo de anastomose 1 IA (AG-1 IA é um dos patógenos mais importantes afetando a cultura da soja no Brasil. Este fungo causa queima da folha e/ou mela em soja, para a qual medidas de manejo cultural são consideradas alternativas importantes para controle antes do estabelecimento da doença. Há evidências de que a adubação potássica diminui substancialmente a severidade dos sintomas de várias doenças da soja como a queima foliar (Cercospora kikuchii, a seca da haste e da vagem (Phomopsis phaseoli var. sojae e o cancro da haste (Diaporthe phaseolorum f. sp. meridionalis. Apesar das evidências do efeito do potássio no controle de várias doenças da soja, não há informação na literatura sobre o efeito desse nutriente no controle da mela. A hipótese testada foi que a mela da soja pode ser controlada através de incrementos na adubação potássica. De maneira geral, concluiu-se que, sob condições de casa de vegetação, o incremento de K no solo não resultou no controle da mela da soja. É necessário, entretanto, confirmar esta observação conduzindo-se experimentos sob condições de campo, podendo-se incluir a avaliação do efeito da doença sob aspectos da produção.The fungus Rhizoctonia solani, belonging to anastomosis group 1IA (AG-1 IA is one of the most important pathogens affecting soybean in Brazil. This fungus causes aerial or foliar blight of soybean, and cultural measures are thought as important choices for the control before the establishment of the disease. Based on evidences that potassium amendments can substantially reduce the severity of several soybean diseases such as Cercospora leaf blight (Cercospora kikuchii, pod and stem blight (Phomopsis phaseoli var. sojae and stem canker (Diaporthe phaseolorum f. sp. meridionalis. Despite all evidence, there is no information in the literature about the effect of potassium controlling the soybean foliar blight. The

  4. Comportamento da alface americana em função do uso de doses e épocas de aplicação de boro em cultivo de inverno Behavior of crisp head lettuce as a result of doses and application times of boron in winter crop

    Directory of Open Access Journals (Sweden)

    Jony E. Yuri

    2004-09-01

    Full Text Available Avaliou-se a influência de doses de bórax sobre o rendimento e qualidade pós-colheita da alface americana (Lactuca sativa L., em três ensaios distintos conduzidos de junho a agosto/2002, no município de Três Pontas (MG. Utilizou-se o delineamento de blocos ao acaso com cinco doses de bórax (0,00; 0,75; 1,50; 2,25 e 3,00 kg ha-1 e quatro repetições, aplicadas em três diferentes épocas via foliar (14; 21 e 28 dias após o transplantio. A massa fresca total apresentou efeito quadrático no qual a dose de 1,58 kg ha-1 de bórax resultou em maior rendimento. Verificou-se variação de 795 a 829 g planta-1 entre as épocas de aplicação, sem diferirem estatisticamente entre si. A aplicação de 1,71 kg ha-1 de bórax possibilitou a obtenção de maior massa fresca comercial. O melhor resultado (563 g planta-1 foi obtido na aplicação aos 21 dias. Esta data também contribuiu na obtenção de maior circunferência da cabeça (41,7 cm, sendo significativamente superior à aplicação aos 28 dias (40,6 cm. Não foram observados efeitos significativos para o comprimento de caule entre os tratamentos. A dose de 1,55 kg ha-1 de bórax proporcionou uma melhor conservação da alface mantida durante 20 dias em câmara-fria.The influence of doses of borax on yield and post harvest quality of crisp head lettuce (Lactuca sativa L. was evaluated. Three distinct trials were conducted in Tres Pontas, Minas Gerais State, Brazil, from June to August 2002. The randomized block design with five doses of borax (0.00; 0.75; 1.50; 2.25 and 3.00 kg.ha-1 and four replicates, applied foliarly at different times (14; 21 and 28 days after transplanting was evaluated. The total fresh matter presented a quadratic effect, where the dose of 1.58 kg ha-1 of borax resulted in a greater yield. A range of 795 to 829 g plant-1 between different application times, with no statistical significant differences was observed. The application of 1.71 kg ha-1 of borax resulted in

  5. A double-blind randomized controlled trial of low doses of propranolol, nortriptyline, and the combination of propranolol and nortriptyline for the preventive treatment of migraine Estudo controlado, randomizado e duplo cego do uso de baixas doses de propranolol, nortriptilina e a combinação destas duas drogas no tratamento preventivo da migrânea

    Directory of Open Access Journals (Sweden)

    Renan B. Domingues

    2009-12-01

    Full Text Available Few trials have evaluated combination of two or more drugs in the preventive treatment of migraine. In this study three therapeutic regimens were compared: (a propranolol, at a dose of 40 mg per day, (b nortriptyline, at a dose of 20 mg per day, and (c the combination of these two drugs in these dosages. The groups were matched according to age, gender, and frequency of migraine attacks prior to treatment. The period of treatment was two months and the frequency and intensity of headache attacks of the 30 days pre-treatment period were compared with the frequency of headaches in the treatment period. Fourteen patients in groups A and B and sixteen patients in group C have completed the study. Treatment with propranolol, alone or in combination, was shown to be effective. Treatment with nortriptyline alone was not effective. All three therapeutic regimens were safe and side effects were minimal. The frequency of discontinuation of the study was the same in the 3 groups but no patient left the study due to adverse reactions. The combined therapy proved to be as safe as the monotherapy. Further studies evaluating this and other possible combinations of drugs in higher doses and for longer periods, should more clearly elucidate the role of combined therapy in the treatment of migraine.Poucos ensaios clínicos têm avaliado o tratamento preventivo da migrânea através da combinação de drogas. Neste estudo, três regimes terapêuticos foram comparados: (a popranolol, na dose de 40 mg por dia, (b nortriptilina, na dose de 20 mg por dia e (c combinação destas duas drogas nestas dosagens. Os grupos foram pareados de acordo com idade, sexo e freqüência de crises previamente ao tratamento. O período de tratamento foi de dois meses e a frequência e a intensidade das crises de cefaléia do período pré-tratamento foram comparadas com as do período de tratamento. Concluíram o estudo 14 pacientes do grupo A, 14 do grupo B e 16 do grupo C. Os

  6. Radiation doses from radiation sources of neutrons and photons by different computer calculation; Tecniche di calcolo di intensita` di dose da sorgenti di radiazione neutronica e fotonica con l`uso di codici basati su metodologie diverse

    Energy Technology Data Exchange (ETDEWEB)

    Siciliano, F.; Lippolis, G.; Bruno, S.G. [ENEA, Centro Ricerche Trisaia, Rotondella (Italy)

    1995-11-01

    In the present paper the calculation technique aspects of dose rate from neutron and photon radiation sources are covered with reference both to the basic theoretical modeling of the MERCURE-4, XSDRNPM-S and MCNP-3A codes and from practical point of view performing safety analyses of irradiation risk of two transportation casks. The input data set of these calculations -regarding the CEN 10/200 HLW container and dry PWR spent fuel assemblies shipping cask- is frequently commented as for as connecting points of input data and understanding theoretic background are concerned.

  7. Study of noise sources of image for optimization of radiation doses in skull computerized tomography; Estudo das fontes de ruido da imagem para fins de otimizacao das doses na tomografia computadorizada de cranio

    Energy Technology Data Exchange (ETDEWEB)

    Medeiros, R.B.; Garos, K.A.C. [UNIFESP - Universidade Federal de Sao Paulo, SP (Brazil)]. E-mail: rbitelli@cfrh.epm.br

    2001-07-01

    Our goal was to evaluate the exposure factors that can change the image noise of head CT in different slices thicknesses. We have evaluated the images noise at several mAs varying from 50 to 800 mAs for 100, 120 and 140 kVp as tension values. The images uniformity were determined for all technical exposure conditions. We did not observed any important noise reduction for values up 200 mAs which can justify the increase of radiation doses through the increase of mAs. (author)

  8. Produtividade, qualidade e estado nutricional da beterraba de mesa em função de doses de nitrogênio Yield, quality and nutritional status of table beet affected by nitrogen rates

    Directory of Open Access Journals (Sweden)

    Leonardo A de Aquino

    2006-06-01

    Full Text Available O N é fundamental para a produtividade e a qualidade das hortaliças, todavia há carência de informações sobre seu uso em beterraba de mesa. Neste trabalho objetivou-se avaliar a produtividade, a qualidade e o estado nutricional nitrogenado da beterraba em função do N aplicado. Foram utilizadas quatro doses de N (0; 100; 200 e 400 kg ha-1de N, no delineamento blocos casualizados, com quatro repetições. Aos 28 dias após o transplante (dat, avaliou-se o estado nutricional nitrogenado por meio do teor de N-NO-3 nas folhas e clorofilômetro (SPAD. Na colheita (56 dat, foram avaliados: área foliar, produção de massas fresca (MF e seca (MS e teores de N-NO-3 e N-total nas folhas e raizes tuberosas e de sólidos solúveis totais nas raizes tuberosas. Com o incremento das doses de N, observaram-se aumentos para todas as características avaliadas. Aos 28 dias após o transplantio, o teor de N-NO-3 e unidades SPAD, correspondentes a 95% da produção máxima foram, respectivamente, de 2.575 mg kg-1 de MS e 44,7 unidades SPAD. Considerando-se apenas os aspectos quantitativo e econômico da produtividade de raizes, a dose de máxima eficiência econômica é de 343 kg ha-1 de N; todavia, ao serem considerados os aspectos quantitativo e qualitativo, a dose recomendada é de 193 kg ha-1 de N.Nitrogen is a fundamental element for the yield and quality of vegetables, but there is little information about its application to table beet crop. This work aimed to evaluate the yield, quality and nutritional status of N of the table beet as affected by the rate of N. Four rates of nitrogen were applied (0; 100; 200 and 400 kg ha-1 N in a randomized block design with four replicates. 28 days after the transplant (dat, the nutritional N status was evaluated through the leaves content of NO-3-N and chlorophyll by the SPAD meter. At harvest (56 dat, the traits evaluated were: leaf area, yield of fresh (FW and dry weight (DW of storage roots and leaves

  9. Emprego de altas doses de amiodarona via oral na reversão da fibrilação atrial no pós-operatório de cirurgia cardíaca High dose amiodarone for the reversion of atrial fibrillation during the postoperative period of cardiac surgery

    Directory of Open Access Journals (Sweden)

    João Carlos Vieira da Costa Guaragna

    1997-12-01

    Full Text Available OBJETIVO: Relatar a experiência no emprego de altas doses de amiodarona via oral (1800mg/d na reversão da fibrilação atrial (FA em pacientes submetidos à cirurgia cardíaca. MÉTODOS: Analisados, retrospectivamente, 80 pacientes que apresentaram FA no pós operatório de cirurgia cardíaca, constituindo 2 grupos: grupo A com 28 pacientes em uso de amiodarona e grupo B recebendo digital, sendo que este grupo foi subdividido no grupo C com 21 pacientes onde foi associada amiodarona, quando não houvesse reversão da arritmia em 48h. As diferenças foram consideradas significativas para um valor de PPURPOSE: To report our experience using high dose oral amiodarone (1,800mg/day for the reversion of atrial fibrillation to sinus rhythm in patients submitted to cardiac surgery. METHODS: We retrospectively analyzed the records of 80 patients who had atrial fibrillation during the postoperative period after cardiac surgery, initially divided in two groups: group A, 28 patients that used amiodarone, and group B composed of patients receiving digoxin. The latter group was divided further in a third group (C, with 21 patients in which amiodarone was associated with digoxin if there was no reversion of the arrhythmia after 48 hours of treatment. The observed differences were considered significant at P<0.05. RESULTS: Atrial fibrillation occurred in 19.4% of the patients submitted to surgery, predominating in males, 60 to 69 years-old. In group A there was reversion to sinus rhythm in 78.6% of the cases. In group B digoxin succeeded in 60%, and in group C 90% of the patients reverted to sinus rhythm. CONCLUSION: High dose oral amiodarone, alone or combined to digoxin, can be safe and effective for the treatment of atrial fibrillation after cardiac surgery.

  10. Doses de nitrogênio no acúmulo de nitrato e na produção da alface em hidroponia Nitrogen rates on nitrate accumulation and lettuce production in hydroponic system

    Directory of Open Access Journals (Sweden)

    Mônica LA Pôrto

    2012-09-01

    Full Text Available A produção da alface em hidroponia apresenta crescente expansão no Brasil, mas ainda ocorrem problemas de qualidade e risco de acúmulo de nitrato. O objetivo desse trabalho foi avaliar a produção da alface (cv. Elba e acúmulo de nitrato em hidroponia em função de níveis crescentes de N na solução nutritiva. Plantas de alface foram cultivadas em estufa telada da UFPB em Areia (PB, em solução nutritiva que continha níveis crescentes de N (11, 13, 15, 17, 19 e 21 mmol L-1 por 25 dias. O delineamento utilizado foi inteiramente casualizado com quatro repetições. Foram avaliadas a produção total (PTT, produção comercial (PCM e os teores de nitrato na matéria fresca da raiz, caule e folhas da alface. Não foram verificados efeitos significativos do incremento dos níveis de N na solução sobre a PTT e PCM, sendo obtidos valores médios de 357,3 e 352,5 g/planta, respectivamente. A elevação dos níveis de N em solução resultou em incrementos nos teores de nitrato em todas as partes da alface, obtendo-se na dose máxima teores de 659, 623 e 615 mg kg-1 de matéria fresca, para raiz, caule e folhas, respectivamente. Os máximos teores foliares de nitrato obtidos se encontraram abaixo do limite de risco para saúde humana.Lettuce production in hydroponic system presents growing expansion in Brazil, but still there are problems of quality and risk of nitrate accumulation. This work was carried out to evaluate the lettuce production and nitrate accumulation in hydroponic system depending on the increasing levels of nitrogen in the nutrient solution. The experiment was conducted in greenhouse of the Universidade Federal da Paraíba, Brazil. The lettuce plants were grown in nutrient solution containing increasing levels of N (11, 13, 15, 17, 19 and 21 mmol L-1 during a 25-day period. An entirely randomized design with four replications was used. Plant total yield (PTT, plant commercial yield (PCM and nitrate contents in the fresh

  11. Produtividade e componentes de produção da soja adubada com diferentes doses de fósforo, potássio e zinco Yield and production components of soybean fertilized with different doses of phosphorus, potassium and zinc

    Directory of Open Access Journals (Sweden)

    Affonso Celso Gonçalves Júnior

    2010-06-01

    Full Text Available O correto incremento da produtividade agrícola deve estar aliado ao avanço tecnológico no conhecimento das exigências nutricionais de cada cultura, proporcionando, dessa forma, o correto uso de insumos na propriedade agrícola. Com o objetivo de estudar a resposta de plantas de soja ao zinco (Zn em relação a diferentes doses de fósforo (P e potássio (K, foi realizado este experimento no município de Palotina-PR. O solo foi classificado como Argissolo Vermelho-Amarelo eutrófico. Os tratamentos foram arranjados em esquema fatorial 3x3, constituindo três formas de adubação com P2O5 e K2O: sem adubação, uma vez e duas vezes a recomendação de adubação pela análise de solo e três doses de Zn (0; 2 e 4 kg ha-1. Como fonte de nutrientes, foram utilizados fosfato bicálcico para P, cloreto de potássio para K e sulfato de zinco para Zn. As doses de Zn aplicadas não influenciaram, significativamente, a produtividade, não sendo justificada a sua suplementação na forma de adubação de base. Já a adubação com P2O5 e K2O provocou significativo aumento da produtividade e aumento do número de legumes por planta, com aumento das doses desses nutrientes no solo.The correct productivity increment must be allied to the technological advance in the knowledge of the nutritional requirements of each culture, thus allowing for the correct use of the inputs in the agricultural property. With the objective of studying the plants of soybean reply to zinc (Zn in relation to the different doses of phosphorus (P and potassium (K, this experiment was performed in the municipality of Palotina-PR. The soil was classified as typic hapludalf. The treatments were arranged in a 3x3 factorial scheme, constituting three fertilization forms with P2O5 e K2O: without fertilization, recommended dose and twice the recommended fertilization dose by the soil analysis and three Zn doses (0; 2 and 4 kg ha-1. Nutrient sources used were bicalcic phosphate for P

  12. Ensaio terapêutico com o pamoato de pirantel na ascaridíase e enterobíase em dose única: estudo da atividade sôbre demais helmintos

    Directory of Open Access Journals (Sweden)

    Lino Dias Rodrigues

    1970-12-01

    Full Text Available Os autores apresentam estudo de 90 pacientes medicados pelo Pamoato de Pirantel (Trans-1,4,5,6-Tetraidro-1-metil-1-2/2- (2-Tienil vinil/pirimidina. todos portadores de parasitoses intestinais, principalmente Ascaris lumbricoides e Enterobius vermicularis. Os pacientes foram divididos em dois grupos; o primeiro, constituído de 25 pacientes, recebeu a dosagem de 5mg/kg, dose única, numa só tomada e neste grupo apenas se estudou a atividade terapêutica na ascaridiase e enterobiase. No segundo grupo, de 65 pacientes, empregou-se a dose única de 10mg/kg numa só tomada e foi estudada, além da ação terapêutica na ascaridiase e enterobiase, possível atividade também sôbre outras helmintiases. Todos os pacientes após a medicação eram submetidos a 3 exames proctoparasitoscópicos de controle (no 7º, 15º, e 30º dia e nos casos prèviamente positivos para Enterobius vermicularis também se fêz controle no 7º e 15º dia pelo "Anal-swab". Comprovaram os autores no primeiro grupo, cura proctoparasitológica de 13 dos 18 casos de ascaridiase (72,2%; na enterobiase obtiveram cura de 61,5%, e na associação Ascaris-Enterobius obtiveram cura de 50,0% de ambos os parasitas, não havendo, entretanto, nenhum caso de falha total nos casos restantes. No segundo grupo, os resultados que obtiveram foram os seguintes: ascaridiase, 50 casos; curados, 40 (80,0%. Enterobiase, 22 casos; curados, 16 (72,7%. Necaturiase, 8 casos; curados, 5 (17,8%. Tricuríase, 41 casos; curados, 5 (12,1%. Estrongiloidiase, 5 casos; curado, 1 caso (20,0%. Associação Enterobius-Ascaris, 14 casos; cura total de ambos os parasitas em 10 casos (71,4%; 4 casos com cura parcial de um ou do outro parasita, não havendo falha total em nenhum caso. Empregaram comprimidos contendo 100 e 300mg da substância ativa, e forma liquida contendo 10mg da substância ativa por cm³. Efeitos colaterais reduzidos em número e em intensidade; o primeiro grupo 12,0% dos casos (epigastralgia

  13. Stability of the response and dependence of the optical signal as function of dose rate of the alanine gel dosimeter for electron clinic beams; Estabilidade da resposta e dependencia do sinal optico em funcao da taxa de dose do dosimetro alanina gel para feixes clinicos de eletrons

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Cleber Feijo; Dias, Daniel Menezes; Campos, Leticia Lucente, E-mail: cfsilva@ipen.b, E-mail: dmdias@ipen.b, E-mail: lcrodri@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2009-07-01

    This work evaluates the stability of response and the dependence on the optical response of dose rate of the alanine gel solution developed at the IPEN, Sao Paulo, Brazil, for possible future usage as 3D dosemeter in the medical area, as the area is lack of measure instrumentation for three dimension dose

  14. Alterações nos atributos químicos de um Latossolo distroférrico decorrentes da granulometria e doses de calcário em sistemas plantio direto e convencional Changes of chemical soil characteristics due to doses and particle sizes of limestone in no-tillage and conventional systems

    Directory of Open Access Journals (Sweden)

    J. C. A. Mello

    2003-06-01

    Full Text Available Atualmente, percebe-se o interesse na calagem superficial, sem prévia incorporação, para instalação do sistema plantio direto (SPD. Dessa forma, objetivou-se determinar os efeitos de granulometria e doses de calcários no SPD, em fase de implantação, e no sistema de plantio convencional (SPC sobre o pH, H + Al, Ca2+ e Mg2+. O experimento foi realizado no ano agrícola de 1998/99, na FCA/UNESP-Botucatu (SP, em Latossolo Vermelho. O delineamento experimental foi de blocos ao acaso, com parcelas subsubdivididas e quatro repetições. As parcelas representaram os sistemas de plantio (SPD e SPC; as subparcelas, a granulometria dos calcários [grosso (PRNT = 56 % e fino (PRNT = 90 %], e as subsubparcelas, as doses de 2, 4 e 6 t ha-1 (calcário grosso e 1,2; 2,4 e 3,6 t ha-1 (fino. O solo foi amostrado, a 0-5, 5-10, 10-20 e 20-40 cm de profundidade, 1, 3 e 12 meses após a aplicação dos corretivos. A análise de variância não detectou interação tripla entre os fatores. A aplicação de calcário superficial no SPD, independentemente da granulometria e da dose, alterou positivamente os atributos químicos do solo (0-5 e 5-10 cm, 12 meses após a calagem. O corretivo continuou reagindo, independentemente do sistema de plantio, de forma intensa, mesmo após três meses. A aplicação de doses mais elevadas de calcário, com maior granulometria, sugeriu efeito residual prolongado.The interest of surface liming of soils on no-tillage system is increasing. The objective of this work was to evaluate the effects of different lime particle sizes and doses applied during the implantation phase of no-tillage and in conventional tillage systems on soil pH and H + Al, Ca2+, and Mg2+ contents. The experiment was carried out in 1998/99, on the experimental farm of São Paulo State University in Botucatu, São Paulo, Brazil, on a Red Distroferric Latossol (Oxisol. A split plot experimental design with four replications was used. The number of plots

  15. Nitrogen doses and weed control via intercropping with gliricidia for corn production Doses de nitrogênio e controle de plantas daninhas, através da consorciação com gliricídia, para produção de milho

    Directory of Open Access Journals (Sweden)

    P.S.L. Silva

    2010-01-01

    Full Text Available Many studies have demonstrated the beneficial influence of nitrogen doses on corn dry grain yield and green ear yield. Due to a growing concern with environmental degradation, many agricultural practices, adopted in the past, are being reexamined. With regard to weed control, strategies that employ mechanical control, including intercrops, are being the object of renewed interest. The purpose of this study was to evaluate the effects of the application of nitrogen doses (0, 40, 80, and 120 kg N ha-1; as ammonium sulfate and weed control on the growth, green ear yield, and grain yield of the AG 1051 corn cultivar. A randomized block experimental design with split-plots and nine replications was adopted. In addition to nitrogen rates, the AG 1051 cultivar was submitted to the following treatments, applied to subplots: no weeding, two hoeings (at 20 and 40 days after sowing, and intercropping with gliricídia (Gliricidia sepium. Gliricidia was sowed at corn planting, between the corn rows, using two seedlings per pit, in pits spaced 0.30 m apart. Gliricidia did not provide weed control, and gave plant growth, green ear yield and grain yield values similar to the no weeding treatment. However, regarding the number of mature ears got, intercropping with gliricidia did not differ from the two-hoeing treatment. Weed control did not have an effect on plant height and number of marketable, husked green ears, with the application of 120 kg N ha-1; indicating that nitrogen improved the corn's competitive ability. The two-hoeing treatment provided the best means for total green ears weight, number of marketable husked ears, both unhusked and husked marketable ear weight, grain yield and its components than the other treatments. Nitrogen application increased corn growth, green ear yield, and grain yield, as well as weed green biomass, but reduced the stand and growth of gliricidia.Muitos estudos demonstraram a influência benéfica da aplicação de doses

  16. Masculinização da tilápia do Nilo, Oreochromis niloticus, utilizando diferentes rações e diferentes doses de 17 a-metiltestosterona Masculinization of Nile tilapia, Oreochromis niloticus, using different diets and different doses of 17 a-methyltestosterone

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    Cleide Schmidt Romeiro Mainardes-Pinto

    2000-06-01

    Full Text Available Os objetivos deste estudo foram comparar a eficiência de duas rações 1 (NUTRAVIT e 2 (IP, ambas com 40% de proteína bruta, contendo o andrógeno sintético 17 a-metiltestosterona (MT, e analisar a dosagem mais efetiva desse hormônio na reversão sexual da Tilápia do Nilo, Oreochromis niloticus, por intermédio da análise histológica das gonadas e da sexagem dos exemplares. Foram utilizadas 9600 larvas de tilápia do Nilo, com 7 dias de vida, recebendo os seguintes tratamentos, por um período de 45 dias: A - 30 mg MT/kg de ração 1; B - 60 mg MT/kg de ração 1; C - 30 mg MT/kg ração 2; D - 60 mg MT/kg ração 2 e dois grupos controle: E e F, rações 1 e 2, respectivamente, sem hormônio. Os resultados dos testes qui-quadrado das freqüências de indivíduos machos e fêmeas analisados histológica e macroscopicamente mostram que o número de machos obtidos nos tratamentos A, B, C e D foi maior que o dos grupos controle e a dosagem de 60 mg MT/kg de ração, nas rações 1 e 2, foi mais eficiente, resultando em 98% de machos. Entre as rações, o tratamento com a ração 1 apresentou o melhor resultado, para a dosagem de 30 mg MT/ kg de ração, não havendo, pois, diferença entre rações para a dose de 60 mg MT/kg de ração.The objectives of the present study were to compare the efficiency of two diets: 1 (NUTRAVIT and 2 (IP, both with 40% of crude protein, containing the synthetic androgen hormone 17 a-methyltestosterone (MT and to analyze the most effective dose of this hormone on the sex reversal of Nile tilapia Oreochromis niloticus, throughout histological analysis of the gonads and sex determination of the samples. A total of 9600 Nile tilapia fries with seven days posthatching received the following treatments, per 45 days period: A- 30 mg MT/kg diet 1; B- 60 mg MT/kg diet 1; C- 30 mg MT/kg diet 2; D- 60 mg MT/kg diet 2 and two control groups, E and F with diets 1 and 2 hormone free, respectively. The results of chi

  17. Segurança, imunogenicidade e eficácia protetora de duas doses da vacina RIX4414 contendo rotavírus atenuado de origem humana Safety, immunogenicity, and protective efficacy of two doses of RIX4414 live attenuated human rotavirus vaccine in healthy Brazilian infants

    Directory of Open Access Journals (Sweden)

    Eliete C. Araujo

    2007-06-01

    Full Text Available OBJETIVO: Determinar a segurança, imunogenicidade e eficácia de duas doses da vacina contra o rotavírus em lactentes brasileiros saudáveis. MÉTODOS: Foi realizado um estudo randomizado, multicêntrico, duplo-cego e controlado por placebo no Brasil, México e Venezuela. Os lactentes receberam duas doses orais de vacina ou placebo aos 2 e 4 meses de idade, juntamente com as imunizações de rotina, exceto a vacina oral contra poliomielite (VOP. O presente estudo relata apenas os resultados obtidos em Belém, Brasil, onde o número de indivíduos por grupo e os títulos da vacina viral foram os seguintes: 194 (104,7 unidades formadoras de focos - UFF, 196 (10(5,2 UFF, 194 (10(5,8 UFF e 194 (placebo. A resposta de anticorpos anti-rotavírus (anti-RV foi avaliada em 307 indivíduos. A gravidade clínica dos episódios de gastroenterite (GE foi determinada através de um escore com 20 pontos, onde um valor > 11 foi considerado como GE grave. RESULTADOS: As taxas de sintomas gerais solicitados foram semelhantes tanto nos indivíduos que receberam a vacina como naqueles a quem se administrou placebo. Aos 2 meses após a segunda dose, ocorreu resposta em termos de IgA sérica para RV em 54,7 a 74,4% dos vacinados. Não houve interferência na imunogenicidade das vacinas de rotina. A eficácia da vacina contra qualquer gastroenterite por rotavírus (GERV foi de 63,5% (IC95% 20,8-84,4 para a maior concentração (10(5,8 UFF. A eficácia foi de 81,5% (IC95% 44,5-95,4 contra GERV grave. Em sua maior concentração (10(5,8 UFF, a RIX4414 conferiu uma proteção de 79,8% (IC95% 26,4-96,3 contra GERV grave causada pela amostra G9. CONCLUSÕES: A RIX4414 foi altamente imunogênica com baixa reatogenicidade, e não interferiu na resposta sérica à difteria, tétano, coqueluche, hepatite B e antígenos Hib. Duas doses da RIX4414 conferiram proteção significativa contra a GE grave causada pelo RV.OBJECTIVE: To determine the safety, immunogenicity and

  18. The Curie–Da Vinci Connection: 5-Years' Experience With Laparoscopic (Robot-Assisted) Implantation for High-Dose-Rate Brachytherapy of Solitary T2 Bladder Tumors

    Energy Technology Data Exchange (ETDEWEB)

    Steen-Banasik, Elzbieta M. van der, E-mail: E.vanderSteen-Banasik@radiotherapiegroep.nl [Radiotherapiegroep, Arnhem (Netherlands); Smits, Geert A.H.J. [Department of Urology, Rijnstate Hospital, Arnhem (Netherlands); Oosterveld, Bernard J.; Janssen, Theo; Visser, Andries G. [Radiotherapiegroep, Arnhem (Netherlands)

    2016-08-01

    Purpose: To report experience and early results of laparoscopic implantation for interstitial brachytherapy (BT) of solitary bladder tumors and the feasibility of a high-dose-rate (HDR) schedule. Methods and Materials: From December 2009 to April 2015, 57 patients with a T2 solitary bladder tumor were treated in Arnhem with transurethral bladder resection followed by external beam irradiation, applied to the bladder and regional iliac lymph nodes, 40 Gy in 20 fractions, 5 fractions per week, and within 1 week interstitial HDR BT, in selected cases combined with partial cystectomy and lymph node dissection. The BT catheters were placed via a transabdominal approach with robotic assistance from a Da Vinci robot after a successful initial experience with a nonrobotic laparoscopic approach. The fraction schedule for HDR was 10 fractions of 2.5 Gy, 3 fractions per day. This was calculated to be equivalent to a reference low-dose-rate schedule of 30 Gy in 60 hours. Data for oncologic outcomes and toxicity (Common Toxicity Criteria version 4) were prospectively collected. Results: These modifications resulted in an average postoperative hospitalization of 6 days, minimal blood loss, and no wound healing problems. Two patients had severe acute toxicity: 1 pulmonary embolism grade 4 and 1 cardiac death. Late toxicity was mild (n=2 urogenital grade 3 toxicity). The median follow-up was 2 years. Using cumulative incidence competing risk analysis, the 2-year overall, disease-free, and disease-specific survival and local control rates were 59%, 71%, 87%, and 82%, respectively. Conclusions: The benefits of minimally invasive surgery for implantation of BT catheters and the feasibility of HDR BT in bladder cancer are documented. The patient outcome and adverse events are comparable to the best results published for a bladder-sparing approach.

  19. Effect of lime levels and cultivars on yield and agroindustrial quality of sugarcane under Amazonic Oxisol = Efeito de doses de calcário e cultivares na produtividade e qualidade agroindustrial da cana-de-açúcar em solo da Amazônia.

    Directory of Open Access Journals (Sweden)

    Sílvio Vieira da Silva

    2014-12-01

    Full Text Available The cultivation of sugarcane in areas with acid soils and low fertility limits the potential yield and agroindustrial quality. The predominant soils in the Amazon region belong to the class of Oxisols and Ultisols, characterized by its high degree of weathering and low natural fertility. The objective of this study was evaluate the effect of different levels of limestone in phosphorus (P availability, yield and agroindustrial quality of different cultivars of sugarcane in very clayey Red-Yellow Oxisol under field conditions, in the Presidente Figueiredo region, State of Amazon. A randomized block design with three replications was used, the treatments were arranged in a split-plot, involving seven levels of liming (0, 1, 2, 3, 4, 5 and 6 t ha-1 and four cultivars of sugarcane (CO 997, RB 72454, RB 835019 and RB 835486. The yield and quality of agroindustrial sugarcane were not influenced by an interaction between liming and cultivars. Higher levels of liming contributed to increased levels of P in the soil and in the plant, and also for higher cane yield of sugarcane. Between cultivars, the RB 835486 presented the largest sugarcane yield and sugar content. = O cultivo da cana-de-açúcar em áreas de solos com características ácidas e de baixa fertilidade limita o potencial da produtividade e qualidades de seus produtos. Os solos predominantes na região Amazônica pertencem à classe dos Latossolos e Argissolos, caracterizados por seu alto grau de intemperismo, acidez e baixa fertilidade natural. Objetivou-se com o presente estudo avaliar o efeito de níveis de calcário na disponibilidade de fósforo (P, o rendimento e a qualidade agroindustrial de cultivares de cana-de-açúcar em um Latossolo Vermelho-Amarelo distrófico, na região de Presidente Figueiredo, no estado do Amazonas. Adotou-se o delineamento de parcelas subdivididas com três repetições, sendo as parcelas constituídas por sete doses de calcário (0, 1, 2, 3, 4, 5 e 6 t ha

  20. Radioproteção, dose e risco em exames radiográficos nos seios da face de crianças, em hospitais de Belo Horizonte, MG Radioprotection, doses and risks in the radiological assessment of paranasal sinuses in children, in hospitals of Belo Horizonte, MG

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    Marco Aurélio de Sousa Lacerda

    2007-12-01

    Full Text Available OBJETIVO: Avaliar a freqüência das incidências radiográficas realizadas nos seios da face de pacientes pediátricos em hospitais de Belo Horizonte, MG, as condições de radioproteção, as técnicas radiográficas empregadas, o kerma no ar de entrada e as doses nos órgãos mais expostos. MATERIAIS E MÉTODOS: Foram coletados os dados dos pacientes e parâmetros de técnica radiográfica empregados em exames de crianças de 1 a 16 anos de idade, em cinco salas de quatro hospitais da cidade, observando, também, aspectos de proteção radiológica. O kerma no ar de entrada foi estimado a partir dos rendimentos dos tubos de raios-x e as doses nos órgãos utilizando o software PCXMC. RESULTADOS: Os valores médios do kerma no ar de entrada para as cinco salas foram, respectivamente, 1.398 µGy, 829 µGy, 877 µGy, 1.168 µGy e 3.886 µGy para pacientes entre 1 e 5 anos de idade. CONCLUSÃO: Foi constatado que as incidências mento-naso e fronto-naso são comumente solicitadas em conjunto, na maioria dos hospitais, o que confere dose significativa para os pacientes. Os riscos para os pacientes podem ser diminuídos mediante a utilização de cilindros de colimação, a não-utilização de grades antiespalhamento, o emprego de altos valores de tensão e baixos valores de tempo.OBJECTIVE: The present study was aimed at evaluating the frequency of radiographic assessment of paranasal sinuses in pediatric patients in hospitals of Belo Horizonte, MG, Brazil. Additionally, aspects regarding radiation protection conditions and radiographic parameters were evaluated, and entrance air kerma and organ doses were estimated. MATERIALS AND METHODS: Patients' data and parameters of radiographic technique employed in the assessment of children in the age range between 1 and 16 years were collected in five examination rooms of four hospitals in Belo Horizonte, also taking into consideration the radiation protection aspects. Entrance air kerma calculation was

  1. Determinação da dose de radiação gama para reduzir a população de Salmonella spp em carne de frango Determination of gamma radiation doses to reduce Salmonella spp in chiken meat

    Directory of Open Access Journals (Sweden)

    A.F. Santos

    2003-08-01

    Full Text Available O consumo de carne de frango contaminada com Salmonella é uma causa importante de salmonelose em todo o mundo. Essa doença transmitida por alimentos, é um problema de saúde pública e causa de perdas econômicas substanciais. O processo de irradiação é um método eficiente de conservação de alimentos por reduzir o número de microrganismos patogênicos e deteriorantes, sem que as características organolépticas e nutricionais do alimento sejam alteradas significativamente. Os objetivos desta pesquisa foram determinar o valor D10 de Salmonella Typhimurium ATCC 14028, inoculada em sobrecoxas de frango, e recomendar uma dose de radiação para ser aplicada a esse alimento a fim de torná-lo seguro do ponto de vista microbiológico. O valor D10 foi calculado a partir da curva de sobreviventes dessa bactéria em sobrecoxas de frango, após terem sido expostas às doses de 0kGy; 0,1kGy; 0,2kGy; 0,3kGy; 0,5kGy; 0,6kGy; 0,7kGy e 0,8kGy. O valor D10 variou de 0,241kGy a 0,480kGy. Considerando o maior valor D10 e o maior nível de contaminação de Salmonella spp encontrado em sobrecoxas de frango - 0,4NMP/g - adquiridas em feiras livres da cidade de São Paulo, a dose de radiação gama recomendada para garantir a segurança do produto em relação à presença de Salmonella spp é de 3,8kGy.The consumption of chicken meat contaminated with Salmonella spp is an important cause of salmonellosis worldwide. This food-borne disease is a public health problem and causes substantial economical loss. Irradiation process is an effective method for food preservation because it causes no significant change in organoleptic and nutritional food characteristics and destroys pathogenic and spoilage microorganisms. D10 values were calculated through the number of survivors for S. Typhimurium ATCC 14028, inoculated in chicken thighs, after being irradiated with different doses of gamma radiation - 0.0kGy; 0.1kGy; 0.2kGy; 0.3kGy; 0.5kGy; 0.7kGy and 0.8kGy . D10

  2. Efeito de doses de torta de filtro e modo de aplicação sobre a produtividade e qualidade tecnológica da soqueira de cana-de-açúcar Effect of filter cake doses and methol of application on yield and technologycal quality of sugar cane ratoon

    Directory of Open Access Journals (Sweden)

    Paulo Roberto Fávero de Fravet

    2010-06-01

    Full Text Available A expansão do setor sucroalcooleiro aumenta áreas de plantio, assim como volumes de resíduos (como a torta de filtro que podem ser utilizados na agricultura como fonte de nutrientes, reduzindo a contaminação ambiental e os custos com adubação, entretanto, faltam informações sobre modos de aplicação. Nesse contexto, conduziu-se este trabalho, com o objetivo de avaliar doses de torta de filtro e modos de aplicação (superficial na linha e incorporado na entrelinha sobre as variáveis tecnológicas e produtividade da cana soca. O experimento foi instalado em soqueira de cana-de-açúcar (SP 81-3250, cultivada em solo de textura argilosa, localizado no município de Goianésia/GO. O delineamento experimental utilizado foi em blocos ao acaso (DBC, com onze tratamentos e 5 repetições, em esquema fatorial 5 X 2 + 1 que correspondem a 5 doses crescentes de torta de filtro (0, 10, 20, 40 e 80 t ha-1, combinadas a 2 modos de aplicação (na linha superficial e na entre linha incorporada e um tratamento adicional correspondente à adubação mineral da Usina Jalles Machado S.A.. A aplicação de torta de filtro na cana-soca na dose de 70 t ha-1 proporcionou a maior produção de colmos de cana-de-açúcar, independentemente do modo de aplicação.The expansion of sugarcane (Saccharum officinarum L. cultivation for the production of sugar or ethanol has increased cultivated land as well as the volume of residues (such as filter cake that may be used in agriculture as a nutrient source, reducing environmental contamination and fertilization costs. However, there is a lack of information about the best way of application. In this way, the objective of the present work was to evaluate the effect of the filter cake dose and the application method (on the ground in the row and incorporated between rows on the technological variables and ratoon yield. The experiment was installed on a sugar cane ratoon (SP 81-3250, cultivated in clay soil in the

  3. Evaluation of radon and their daughters concentration and estimative of effective dose in a waste deposits at the ore treatment unity of INB/Pocos de Caldas, Brazil; Avaliacao da concentracao de radonio e seus filhos e estimativa de dose efetiva em um deposito de rejeitos na unidade de tratamento de minerios da INB/Caldas

    Energy Technology Data Exchange (ETDEWEB)

    Dantas, Marcelino V.A.; Garcia Filho, Oswaldo; Antunes, Marcos M.; Junior, Joao V.S.; Py Junior, Delcy A., E-mail: marcelino@inb.gov.b, E-mail: wspereira@inb.gov.b, E-mail: ogarcia@inb.gov.b, E-mail: antunes@inb.gov.b, E-mail: Joao@inb.gov.b, E-mail: delcy@inb.gov.b [Industrias Nucleares do Brasil (UTM/INB), Caldas, MG (Brazil). Unidade de Tratamento de Minerios; Pereira, Wagner S. [Industrias Nucleares do Brasil (UTM/INB), Caldas, MG (Brazil). Unidade de Tratamento de Minerios; Universidade Federal Fluminense (IB/UFF), Niteroi, RJ (Brazil). Inst. de Biologia. Lab. de Radiobiologia e Radiometria Pedro Lopes dos Santos

    2011-10-26

    This paper conducts a surveillance of radon and their short half-life daughters gas concentration, inside the warehouse due to these gas inhalation. The results showed that the average concentration inside the warehouse ix approximately 700 Bq/m{sup 3} and the effective dose of an IOE, related to that concentration would be 5.0 mSv/year, therefore being 4 times lower than the established limit of 20 mSv/year

  4. Aerial gamma spectrometry of the uranium province of Lagoa Real (Caetite, BA, Brazil): go environmental aspects and distribution of the absorbed dose in the air; Espectrometria gama aerea da provincia uranifera de Lagoa Real (Caetite, BA): aspectos geoambientais e distribuicao da dose absorvida no ar

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Esau Francisco Sena

    2006-07-01

    In the present study, it was analyzed the surface concentrations of the natural radioelements K, U and Th, as well as the absorbed dose rate in air caused by gamma radiation from the Lagoa Real uranium province, which is located at the center southern portion of Bahia State and comprises an area of approximately 4.600 Km{sup 2}. Data from the airborne gamma ray spectrometric survey of the region (Sao Timoeo Project) carried out in 1979, was used in this study. Besides, recent data of U, Th and absorbed dose rates from the Environmental Monitoring Program of the uranium concentration plant (URA), operated in the region by the Brazilian Nuclear Industries (INB), were used with the aim of inter compare the sampling points in the same geo referenced area. Imaging geo processing software's give support to frame maps of surface concentrations and ternary maps, as well as allow the integration of these with other themes (e.g. hydrology, geology, pedology) favouring the interpretation of geo environmental process from the radioactive cartography. Considering the whole study area, it was obtained the following mean values: absorbed dose rate in air (61,08 nGy.h{sup -1}), Potassium (1,65 % K) , Uranium (3,02 ppm eU) and thorium (18,26 ppm eTh). The geological unities bounding the uranium anomalies were placed in the areas characterized by the highest values of radioelements and, as expected, the major dose levels. The use of ternary maps coupled with the geology and hydrology allowed distinguishing the relationship between the surface distribution of natural radioelements and the geo environmental aspects, including the influence of the catchment in their transport and migration. (author)

  5. Aerial gamma spectrometry of the uranium province of Lagoa Real (Caetite, BA, Brazil): go environmental aspects and distribution of the absorbed dose in the air; Espectrometria gama aerea da provincia uranifera de Lagoa Real (Caetite, BA): aspectos geoambientais e distribuicao da dose absorvida no ar

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Esau Francisco Sena

    2006-07-01

    In the present study, it was analyzed the surface concentrations of the natural radioelements K, U and Th, as well as the absorbed dose rate in air caused by gamma radiation from the Lagoa Real uranium province, which is located at the center southern portion of Bahia State and comprises an area of approximately 4.600 Km{sup 2}. Data from the airborne gamma ray spectrometric survey of the region (Sao Timoeo Project) carried out in 1979, was used in this study. Besides, recent data of U, Th and absorbed dose rates from the Environmental Monitoring Program of the uranium concentration plant (URA), operated in the region by the Brazilian Nuclear Industries (INB), were used with the aim of inter compare the sampling points in the same geo referenced area. Imaging geo processing software's give support to frame maps of surface concentrations and ternary maps, as well as allow the integration of these with other themes (e.g. hydrology, geology, pedology) favouring the interpretation of geo environmental process from the radioactive cartography. Considering the whole study area, it was obtained the following mean values: absorbed dose rate in air (61,08 nGy.h{sup -1}), Potassium (1,65 % K) , Uranium (3,02 ppm eU) and thorium (18,26 ppm eTh). The geological unities bounding the uranium anomalies were placed in the areas characterized by the highest values of radioelements and, as expected, the major dose levels. The use of ternary maps coupled with the geology and hydrology allowed distinguishing the relationship between the surface distribution of natural radioelements and the geo environmental aspects, including the influence of the catchment in their transport and migration. (author)

  6. Determination of shielding factors for typical buildings in Brazil; Determinacao dos fatores de blindagem para construcoes tipicamente brasileiras

    Energy Technology Data Exchange (ETDEWEB)

    Salinas, Isabel Cristina Poquet

    2006-10-15

    This study presents a methodology for the determination of the air kerma inside buildings due to contamination on the external surfaces and the shielding factors for the construction material to be used on emergency assessment systems for urban areas. The commonly used construction materials were simulated with the MCNP computer code. A special methodology to simulate the bricks with holes were developed, mixing all different regions into a single one, making the simulation easier and faster. The effective density and the attenuation coefficients for the 50-3000 keV energy range were determined. The effective protection for the bricks with no cement cover decreases by 40-50% for energies greater then 300 keV when compared to bricks covered on both sides. With the data made available it was possible to evaluate the influence of the construction materials densities and thickness on the exposure due to external surfaces contamination and to estimate the error on the dose when the shielding factor applied on the calculation differs from the more realistic ones. The shielding factors for three types of walls were determined for a five rooms house. Special protection procedures should be applied for houses built with bricks with no cement cover, because they are due to the double of the dose when compared to houses built with bricks two-sided cement covered. The influence of windows and doors were evaluated too. This work was developed at the IRD in order to provide information on the construction material commonly uses on building in Brazil. (author)

  7. Dose reduzida de clethodim no controle de papua na cultura da soja, em função da época de aplicação Reduced rate of clethodim for alexandergrass: control in soybeans as a function of application time

    Directory of Open Access Journals (Sweden)

    Nilson G. Fleck

    1997-01-01

    Full Text Available Foi realizado um experimento a campo em Eldorado do Sul, RS, no ano agrícola de 19 94 /9 5, para avaliar o controle de papuã (Brachiaria plantaginea (Linck Hitchc., que ocorreu numa população média de 95 plantas/m2. Foi avaliado o herbicida clethodim à dose-plena (120g/ ha e à meia-dose (60g/ha. A cultivar de soja utilizada foi RS-7 Jacuí e usado o delineamento experimental em blocos casualizados com quatro repetições. Os tratamentos foram aplicados aos 14, 21, 28 e 35 dias após a emergência da soja (DAE. Foram mantidas testemunhas capinadas, com operações iniciadas nas mesmas épocas de aplicação do herbicida, e uma testemunha infestada durante todo o ciclo da cultura. O controle foi avaliado visualmente, em três ocasiões, através de escala percentual. Os graus de controle de papua obtidos à dose-plena foram equivalentes entre si quando aplicado nas três primeiras épocas, com eficiência entre 95 e 98% na última avaliação. A meia-dose mostrou, para as três primeiras épocas de aplicação, resultados semelhantes aos de doseplena, porém em níveis um pouco inferiores, situando-se entre 85 e 95% o controle obtido na última avaliação. O controle do papuã foi mediano quando clethodim foi aplicado aos 35 DAE, tanto par a dose-plena quanto para meiadose. Quanto ao rendimento de grãos, não houve diferença estatística significativa entre os tratamentos em suas várias modalidades, embora todos tenham superado a testemunha infestada, com incrementos na produtividade de grãos entre 73 e 10 5% . O experimento permite concluir pela viabilidade da utilização de meiadose de clethodim para o controle de papua em soja, realizando as aplicações preferencialmente até a quarta semana após a emergência da cultura.A field trial was carried out in Eldorado do Sul, RS, during the 1994/95 growing season to evaluate Alexandergrass (Brachiaria plantaginea (Linck Hitchc control, that occurred with na average population of 95

  8. Mobilidade de potássio em solos decorrente da adição de doses de cloreto de potássio Potassium movement in soils as related to potassium chloride application

    Directory of Open Access Journals (Sweden)

    Lisiane Silva das Neves

    2009-02-01

    Full Text Available Em solos recentemente fertilizados, as plantas absorvem os nutrientes que estão principalmente nas adjacências dos grânulos, cuja composição química é pouco conhecida. Este trabalho teve como objetivo avaliar o gradiente de concentração de K e a concentração eletrolítica a partir da região fertilizada com KCl em cinco solos, que tinham quantidades variáveis de argila (95 a 569 g kg-1 e de matéria orgânica (13 a 54 g kg-1. Os tratamentos consistiram de doses de KCl equivalentes a 0, 50, 100 e 200 kg ha-1 de K2O. Para obter as quantidades a serem aplicadas, considerou-se que essas doses seriam adicionadas sobre a superfície do solo, em linhas distanciadas de 0,70 m, e atingiria uma faixa de 2,5 cm, ou seja, entrariam em contato com 357 m² ha-1 de solo. Cada unidade experimental foi formada pela união de dois tubos horizontais de PVC, cada um com 7,0 cm de diâmetro e 9,0 cm de comprimento, preenchida com solo. Os grânulos de KCl foram distribuídos uniformemente entre duas folhas circulares de papel-filtro (7,0 cm de diâmetro, que foram colocadas na superfície de junção dos dois tubos. O gradiente de concentração de K nos solos foi quantificado por meio da concentração do K trocável (Mehlich-1 em diferentes distâncias a partir do local de aplicação dos grânulos. A movimentação de K variou com o tipo de solo, aumentou com a dose de KCl e foi menor no solo que tinha mais areia e menos matéria orgânica. Após 7 dias, com a maior dose de KCl aplicada (200 mg kg-1 K2O, a movimentação de K foi maior no Cambissolo Húmico léptico CHat (8,4 cm e menor no Latossolo Vermelho distrófico LVd (6,4 cm. A amplitude de concentração de K no centímetro mais próximo do adubo variou de 9.800 a 16.475 mg kg-1; na camada distante de 4,0 a 5,0 cm dos grânulos, o K variou de 244 a 2.254 mg kg-1. A condutividade elétrica não atingiu valores prejudiciais ao processo germinativo de espécies com média tolerância a sais

  9. Staying at the crossroads: assessment of the potential of serum lithium monitoring in predicting an ideal lithium dose Em uma encruzilhada: potencial do nível plasmático de lítio como preditor da dose ideal

    Directory of Open Access Journals (Sweden)

    Thiago Zaqueu Lima

    2008-09-01

    ção normal. Coletou-se amostras de sangue para dosagem plasmática do lítio. RESULTADOS: Os animais alimentados com a ração com 0,255% de cloreto de lítio fizeram mais rearing no campo aberto e tiveram uma maior freqüência de entradas nos braços do labirinto elevado que os animais que ingeriram a dose mais alta. Apesar disso, verificou-se níveis plasmáticos de lítio semelhantes em ambos os grupos. DISCUSSÃO: A variação nos comportamentos destarte a presença de níveis plasmáticos semelhantes sugere que as diferentes doses produziram diferentes concentrações cerebrais não detectadas pela medida plasmática. CONCLUSÃO: Medidas da concentração plasmática de lítio não permitem prever de forma completa seus efeitos comportamentais.

  10. Componentes da Produção de Forragem em Pastagens dos Capins Tanzânia e Mombaça Adubadas com Quatro Doses de NPK Components of Herbage Production of Tanzania and Mombaça Pastures Fertilized with Four Doses of NPK

    Directory of Open Access Journals (Sweden)

    Danilo Gusmão de Quadros

    2002-06-01

    Full Text Available O trabalho foi conduzido na FCAV-Unesp, em Jaboticabal-SP, para avaliar os efeitos de quatro doses combinadas de NPK sobre os componentes da produção e das perdas de matéria seca (MS em pastagens dos cultivares Tanzânia e Mombaça de Panicum maximum Jacq., manejadas com 28 dias de descanso e com altura média de 30 cm de resíduo pós-pastejo. As avaliações foram realizadas em parcelas de 96 m² segundo um fatorial 2 (cultivares x 4 (doses de NPK, em blocos completos ao acaso, com três repetições. As adubações estudadas corresponderam ao decréscimo em 30 % e aos acréscimos em 30 e 60 % de uma dose "padrão" com 145; 21,6 e 180 kg/ha de N, P2O5 e K2O, respectivamente (referente a 1,2; a 0,08; e a 1,2 % de N, P e K na MS, com produção estimada em 12000 kg/ha. A MS verde (MSV em pré-pastejo e no resíduo aumentou linearmente com a adubação, com maiores valores obtidos para o cv. Mombaça (9183 e 5227 kg/ha, respectivamente do que para o cv. Tanzânia (6275 e 3808 kg/ha, respectivamente. A participação de lâminas foliares na MSV em pré-pastejo foi menor no cv. Tanzânia (51 % do que no cv. Mombaça (54 %. A densidade de perfilhos não variou com a adubação. O aumento do peso de perfilho com a elevação das doses de NPK resultou em maiores produções de MSV. A MS senescida (média de 3108 kg/ha de MS não diferiu entre cultivares. De modo geral, quanto maior a dose de adubo aplicado, maiores foram a taxa de acúmulo diário de MSV e a MSV perdida por pisoteio. O cv. Mombaça apresentou maior potencial de resposta à adubação do que o cv. Tanzânia, com taxas de lotação de 6,2 e 4,0 UA/ha, respectivamente.The experiment was conducted at the FCAV-Unesp, Jaboticabal-SP, to evaluate the effects of the fertilization with four doses of NPK on the components of dry matter (DM and losses by trampling of two cultivars of Panicum maximum Jacq. (Tanzania and Mombaça under grazing, having a rest period of 28 days and an average

  11. Estudo da circulação retrobulbar e do campo visual após dose única oral de citrato de sildenafil (Viagra® The effects of a single dose of sildenafil citrate (Viagra® on the retrobulbar circulation and visual field

    Directory of Open Access Journals (Sweden)

    Alessandra Kurahashi

    2001-08-01

    Full Text Available Objetivo: Estudar os efeitos na circulação retrobulbar e no campo visual de uma dose oral única de 100 mg de citrato de sildenafil (Viagra®. Métodos: Um estudo duplo-mascarado e controlado por placebo foi realizado em 10 voluntários do sexo masculino, com idade média de 27,7 + 5,68 anos. O olho direito de cada voluntário foi submetido aos exames de Doppler colorido de órbita e análise de campo visual por meio de perimetria computadorizada (Humphrey, programa 30-2, estratégia "Full Threshold" em 3 ocasiões: "baseline", 1 hora após placebo e 1 hora após 100 mg de sildenafil via oral. No campo visual, analisaram-se o limiar foveal e o "mean deviation" (MD nas 3 ocasiões. No Doppler colorido, medimos a velocidade sistólica máxima (VSM, a velocidade diastólica final (VDF e o índice de resistência (IR da artéria central da retina (ACR e da artéria oftálmica (AO nas 3 ocasiões. Resultados: A administração do sildenafil não alterou significativamente o limiar foveal e o "mean deviation" em relação ao "baseline" e ao placebo. Houve um aumento significativo da velocidade sistólica máxima e velocidade diastólica final na artéria oftálmica após a administração do citrato de sildenafil (pPurpose: To analyze the effects of 100 mg of sildenafil citrate (Viagra® on the retrobulbar circulation and visual field. Methods: A double masked, placebo controlled study was conducted in 10 males with a mean age of 27.7 + 5.68 years. The right eye of each volunteer underwent orbital color Doppler imaging and automated perimetry (Humphrey, program 30-2, Full-Threshold Strategy at 3 occasions: baseline, 1 hour after placebo and 1 hour after 100 mg of sildenafil. The foveal threshold and the mean deviation (MD were analyzed by automated perimetry on the three occasions. Color Doppler imaging allowed the measurement of the peak systolic velocity (PSV, end diastolic velocity (EDV and Pourcelot index (PI in the central retinal artery and

  12. Normalization of lymphocyte count after high ablative dose of I-131 in a patient with chronic lymphoid leukemia and secondary papillary carcinoma of the thyroid: case report; Normalizacao da contagem de linfocitos apos dose ablativa de I-131 em um paciente com leucemia linfoide cronica e carcinoma papilifero da tireoide: relato de caso

    Energy Technology Data Exchange (ETDEWEB)

    Thom, Anneliese Rosmarie Gertrud Fischer; Hamerschlak, Nelson; Osawa, Akemi; Santos, Fabio Pires de Souza; Pasqualin, Denise da Cunha; Wagner, Jairo; Yamaga, Lilian Yuri Itaya; Cunha, Marcelo Livorsi da; Campos Neto, Guilherme de Carvalho; Funari, Marcelo Buarque de Gusmao, E-mail: afthom@einstein.br [Hospital Israelita Albert Einstein, Sao Paulo, SP (Brazil); Teles, Veronica Goes [Sociedade Brasileira de Diabetes, Sao Paulo, SP (Brazil)

    2014-07-01

    The authors report the case of a 70-year-old male patient with chronic lymphoid leukemia who presented subsequently a papillary carcinoma of the thyroid with metastases to regional lymph nodes. The patient was treated with surgical thyroidectomy with regional and cervical lymph node excision and radioiodine therapy (I-131). The protocolar control scintigraphy 4 days after the radioactive dose showed I-131 uptake in both axillae and even in the inguinal regions. PET/CT showed faint FDG-F-18 uptake in one lymph node of the left axilla. An ultrasound guided fine needle biopsy of this lymph node identified by I-131 SPECT/CT and FDG-F-18 PET/CT revealed lymphoma cells and was negative for thyroid tissue and thyroglobulin content. The sequential blood counts done routinely after radiation treatment showed a marked fall until return to normal values of leucocytes and lymphocytes (absolute and relative), which were still normal in the last control 19 months after the radioiodine administration. Chest computed tomography showed a decrease in size of axillary and paraaortic lymph nodes. By immunohistochemistry, cells of the lymphoid B lineage decreased from 52% before radioiodine therapy to 5% after the procedure. The authors speculate about a possible sodium iodide symporter expression by the cells of this lymphoma, similar to some other non-thyroid tumors, such as breast cancer cells. (author)

  13. Absolute activity measurement and gamma-ray emission probability for decay of I-126; Medida absoluta da atividade e determinacao da taxa de emissao gama por decaimento do {sup 126} I

    Energy Technology Data Exchange (ETDEWEB)

    Fonseca, Katia Aparecida

    1997-07-01

    The accurate knowledge of the gamma-ray emission probability per decay of radionuclides is important in several applications. In the case of {sup 126} I, its importance lies mainly in fast neutron dosimetry as well as in the production of {sup 125} I where {sup 126} I appears as an impurity. In the present work the gamma-ray emission probabilities per decay for the 388 and 666-KeV transitions of {sup 126} I have been measured. This radionuclide was obtained by means of the {sup 127} I(n, 2n){sup 126} I reaction in a fast neutron flux at the IPEN 2 MW research reactor. The methodology for the primary standardization of {sup 126} I is described. For this purpose, two different coincidence systems were used due to the complex decay scheme of this radionuclide. The {beta}branch measurement was carried out in a 4 {pi}(PC){beta}-{gamma} coincidence system consisting of a proportional counter, coupled to a pair of 3'x3' Na I (Tl) crystal. The electron capture branch was measured in a X-{gamma} coincidence system using two NaI(Tl) crystals. The gamma-ray measurements were performed in a HPGe system, previously calibrated by means of standard sources supplied by the International Atomic Energy Agency. All the uncertainties evolved were treated rigorously, by means of covariance analysis. (author)

  14. Biosynthetic origin of acetic acid using SNIF-NMR; Determinacao da origem biossintetica de acido acetico atraves da tecnica 'Site Specific Natural Isotopic Fractionation Studied by Nuclear Magnetic Resonance (SNIF-NMR)'

    Energy Technology Data Exchange (ETDEWEB)

    Boffo, Elisangela Fabiana; Ferreira, Antonio Gilberto [Sao Carlos Univ., SP (Brazil). Dept. de Quimica

    2006-05-15

    The main purpose of this work is to describe the use of the technique Site-Specific Natural Isotopic Fractionation of hydrogen (SNIF-NMR), using {sup 2}H and {sup 1}H NMR spectroscopy, to investigate the biosynthetic origin of acetic acid in commercial samples of Brazilian vinegar. This method is based on the deuterium to hydrogen ratio at a specific position (methyl group) of acetic acitained by fermentation, through different biosynthetic mechanisms, which result in different isotopic ratios. We measured the isotopic ratio of vinegars obtained through C{sub 3}, C{sub 4}, and CAM biosynthetic mechanisms, blends of C{sub 3} and C{sub 4} (agrins) and synthetic acetic acid. (author)

  15. Determination of curve 1/M profile as a function of control rod bank position; Determinacao do perfil da curva 1/M em funcao da posicao dos bancos de barras de controle

    Energy Technology Data Exchange (ETDEWEB)

    Pereira, Valmir; Martinez, Aquilino Senra; Silva, Fernando Carvalho da [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia. Programa de Engenharia Nuclear

    2002-07-01

    Determination of the subcritical multiplication curve profile (1/M) as a function of control rod bank position is of paramount importance to the development of a system which allows to foresee and also anticipate determination of criticality of a PWR reactor core. This work aims at determining this profile. For that, the 3D- two group-diffusion equations for a subcritical PWR reactor core with external neutron source is solved for different control rod bank positions. Results obtained are compared with the results from the corresponding eigenvalue problem, in order to verify how the external neutron source interferes with the reactor criticality search. (author)

  16. Precision of dual energy X-ray absorptiometry for body composition measurements in cats; Precisao da tecnica de absorciometria de raios-X de dupla energia na determinacao da composicao corporal em gatos

    Energy Technology Data Exchange (ETDEWEB)

    Borges, N.C. [Universidade Federal de Goias (UFG), Goiania, GO (Brazil). Escola de Veterinaria]. E-mail: naida@vet.ufg.br; Vasconcellos, R.S.; Canola, J.C.; Carciofi, A.C.; Pereira, G.T. [UNESP, Jaboticabal, SP (Brazil). Faculdade de Ciencias Agrarias e Veterinarias; Paula, F.J.A. [Universidade de Sao Paulo (USP), Ribeirao Preto, SP (Brazil). Faculdade de Medicina

    2008-07-01

    A short-term precision error of the individual subject and the DEXA technique, such as the effect of the repositioning of the cat on the examination table, were established. Four neutered adult cats (BW=4342 g) and three females (BW=3459 g) were submitted to five repeated scans with and without repositioning between them. Precision was estimated from the mean of the five measurements and expressed by the individual coefficient of variation (CV). The precision error of the technique was estimated by the variance of scan pool (n=35) and expressed in CV for the technique (CVt). The degrees of freedom and confidence intervals were determined to avoid underestimation of precision errors. Bone mineral content (BMC), lean mass (LM), and fat mass (FM) averages were higher (P<0.05) when animals were repositioned. The CVt was significantly higher (P<0.05) for bone mineral density (BMD), LM, and FM when the animals were repositioned. For short-term precision measurements, the repositioning of the animal was important to establish the precision of the technique. The dual energy xray absorptiometry method provided precision for body composition measurements in adult cats. (author)

  17. Feasibility study of photodiodes utilization in the soil-moisture determination by gamma transmission; Estudo da viabilidade da utilizacao de fotodiodos na determinacao de umidade de solos por transmissao gama

    Energy Technology Data Exchange (ETDEWEB)

    Santos, L A.P. dos

    1992-08-01

    This study was done to verify the viability of photodiodes, as gamma radiation detector ({sup 241} Am - Energy=60 KeV), to measure soil water content. The photodiodes used had different mechanical and electrical characteristics, and were tested on soils of different textures. A good linear correlation between the logarithm of the attenuation factor and soil-moisture demonstrated such viability, and that the low photopeak efficiency of these devices is not a limitation to the measurement of soil water content. Furthermore, the stability, the portability, and low cost of such semiconductor devices, including its electronic system, represent relevant characteristics that may justify the development of a reliable gamma meter system for field studies. (author). 37 refs, 21 figs, 20 tabs.

  18. Absolute activity measurement and gamma-ray emission probability for decay of I-126; Medida absoluta da atividade e determinacao da taxa de emissao gama por decaimento do {sup 126} I

    Energy Technology Data Exchange (ETDEWEB)

    Fonseca, Katia Aparecida

    1997-07-01

    The accurate knowledge of the gamma-ray emission probability per decay of radionuclides is important in several applications. In the case of {sup 126} I, its importance lies mainly in fast neutron dosimetry as well as in the production of {sup 125} I where {sup 126} I appears as an impurity. In the present work the gamma-ray emission probabilities per decay for the 388 and 666-KeV transitions of {sup 126} I have been measured. This radionuclide was obtained by means of the {sup 127} I(n, 2n){sup 126} I reaction in a fast neutron flux at the IPEN 2 MW research reactor. The methodology for the primary standardization of {sup 126} I is described. For this purpose, two different coincidence systems were used due to the complex decay scheme of this radionuclide. The {beta}branch measurement was carried out in a 4 {pi}(PC){beta}-{gamma} coincidence system consisting of a proportional counter, coupled to a pair of 3'x3' Na I (Tl) crystal. The electron capture branch was measured in a X-{gamma} coincidence system using two NaI(Tl) crystals. The gamma-ray measurements were performed in a HPGe system, previously calibrated by means of standard sources supplied by the International Atomic Energy Agency. All the uncertainties evolved were treated rigorously, by means of covariance analysis. (author)

  19. Experimental determination of the distribution coefficient (Kd) of lead and barium in soils of semiarid region of Bahia, Brazil; Determinacao experimental do coeficiente de distribuicao (Kd) de chumbo e bario em solos da regiao semiarida do estado da Bahia

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Mariana M.; Fernandes, Heloisa H.F; Pontedeiro, Elizabeth M.; Su, Jian, E-mail: mariana@lasme.coppe.ufrj.br, E-mail: heloisa@lasme.coppe.ufrj.br, E-mail: bettinadulley@hotmail.com, E-mail: sujian@lasme.coppe.ufrj.br [Coordenacao dos Programas de Pos-Graduacao em Engenharia (COOPE/UFRJ), Rio de Janeiro, RJ (Brazil). Lab. de Simulacao e Metodos em Engenharia

    2013-07-01

    To determine the concentration of heavy metals and other contaminants in soils, aimed at evaluating the environmental impact, the use of the distribution coefficient is required (Kd), defined as the relationship between the concentrations adsorbed and in solution. The objective of this study was to determine the rates for the Lead and Barium metals in soil collected in Caetite, the state of Bahia, in two different depths. The importance of determining the distribution coefficient lies in the fact that being performed using a tropical soil. For the isotherms of Kd was used batch test method by adsorption to obtain the final concentrations. The first step was to determine the best ratio soil: solution obtained after equilibration time and finally the equilibrium concentration of the contaminant. Were also calculated percentages of the metal adsorbed by the soil and the amount of solute by the adsorbent. With the values obtained in experiments and using Mathematica 8.0 software, were made graphics equilibrium concentration versus quantity adsorbed (C vs. S). It can also plot isotherms for different models of Kd: linear, Langmuir and Freundlich in order to determine which adsorption model would fit best to the measured data and thus determine the distribution coefficient of the metal in the soil analyzed. The Freundlich isotherm was better adapted to the points of the two metals in both soils.

  20. Combined discrete nebulization and microextraction process for molybdenum determination by flame atomic absorption spectrometry (FAAS); Avaliacao da combinacao da nebulizacao discreta e processos de microextracao aplicados a determinacao de molibdenio por espectrometria de absorcao atomica com chama (FAAS)

    Energy Technology Data Exchange (ETDEWEB)

    Oviedo, Jenny A.; Jesus, Amanda M.D. de; Fialho, Lucimar L.; Pereira-Filho, Edenir R., E-mail: erpf@ufscar.br [Universidade Federal de Sao Carlos (UFSCar), SP (Brazil). Departamento de Quimica

    2014-04-15

    Simple and sensitive procedures for the extraction/preconcentration of molybdenum based on vortex-assisted solidified floating organic drop microextraction (VA-SFODME) and cloud point combined with flame absorption atomic spectrometry (FAAS) and discrete nebulization were developed. The influence of the discrete nebulization on the sensitivity of the molybdenum preconcentration processes was studied. An injection volume of 200 μ resulted in a lower relative standard deviation with both preconcentration procedures. Enrichment factors of 31 and 67 and limits of detection of 25 and 5 μ L{sup -1} were obtained for cloud point and VA-SFODME, respectively. The developed procedures were applied to the determination of Mo in mineral water and multivitamin samples. (author)

  1. Efeitos hemodinâmicos e renais da injeção de doses elevadas de clonidina no espaço peridural do cão Efectos hemodinámicos y renales de la inyección de dosis elevadas de clonidina en el espacio peridural del perro Hemodynamic and renal effects of high epidural clonidine doses in dogs

    Directory of Open Access Journals (Sweden)

    Nilson Camargo Roso

    2005-06-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Não existem estudos que relatem as repercussões renais determinadas pela injeção de doses elevadas de clonidina no espaço peridural. O objetivo do estudo foi avaliar os efeitos hemodinâmicos e renais determinados pela injeção de doses elevadas de clonidina no espaço peridural do cão. MÉTODO: Vinte animais anestesiados com tiopental sódico e fentanil foram distribuídos aleatoriamente e de forma duplamente encoberta em dois grupos: Grupo 1 ou placebo (n = 10, que recebeu 0,2 mL.kg-1 de solução fisiológica, e Grupo 2 ou clonidina (n = 10, que recebeu 0,2 mL.kg-1 de uma solução contendo 50 µg.mL-1 de clonidina, no espaço peridural. Foram avaliados os seguintes parâmetros hemodinâmicos: freqüência cardíaca (FC: bat.min-1; pressão arterial média (PAM: mmHg; pressão da artéria pulmonar ocluida (PAOP: mmHg; débito cardíaco (DC: L.min-1; volume sistólico (VS: mL; também, os seguintes parâmetros da função renal foram avaliados: fluxo sangüíneo renal (FSR: mL.min-1; resistência vascular renal (RVR: mmHg.mL-1.min; volume urinário minuto (VUM: mL.min-1; depuração de creatinina (D Cr: mL.min-1; depuração de para-aminohipurato (D PAH: mL.min-1; fração de filtração (FF; depuração de sódio (D Na: mL.min-1; depuração de potássio (D K: mL.min-1; excreção fracionária de sódio (EF Na: %; excreção urinária de sódio (U NaV: µEq.min-1; excreção urinária de potássio (U K V: µEq.min-1. O experimento consistiu em três momentos de 20 minutos cada. Os dados foram coletados aos 10 minutos de cada momento e a diurese, no início e no final de cada momento. Ao término de M1, a clonidina ou a solução fisiológica foi administrada no espaço peridural. Após período de 20 minutos iniciou-se M2 e, em seguida, M3. RESULTADOS: A clonidina na dose de 10 µg.kg-1 no espaço peridural do cão promoveu alterações significativas, com diminuições da freqüência cardíaca e do d

  2. Effect of a booster-dose of rabies vaccine on the duration of virus neutralizing antibody titers in bovines Efeito de uma dose de reforço da vacina anti-rábica sobre a duração de títulos de anticorpos neutralizantes do vírus, em bovinos

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    Avelino Albas

    1998-08-01

    Full Text Available Humoral immune response using inactivated rabies vaccine was studied in 35 nelore cross-bred bovines of western region of São Paulo state. Ninety days after vaccination, 13 (92.8% animals presented titers 30.5IU/ml, through mouse neutralization test. After 180 days, 9 (64.3% sera showed titers 30.5IU/ml, after 270 days, only one (7.1% showed a titer of 0.51IU/ml, and after 360 days, all animals showed titers 0.5IU/ml. At 180 days, 17 (80.9% sera presented titers > 0.5IU/ml; at 270 days, 15 (71.4%, with titers 30.5IU/ml and at 360 days, 4 (19.0%, with titers 30.5IU/ml. Booster-dose ensured high levels of neutralizing antibodies for at least three months, and 240 days after revaccination, 71.4% of animals were found with titers 30.5IU/ml.A resposta humoral com vacina anti-rábica inativada foi estudada em 35 bovinos mestiços de raça nelore, na região oeste do estado de São Paulo. Noventa dias após a primo-vacinação, 13 (92,8% animais apresentaram títulos 30,5UI/ml, através da prova de soroneutralização em camundongos. Após 180 dias, 9 (64,3% soros evidenciaram títulos 30,5UI/ml; após 270 dias, apenas 1 (7,1% soro demonstrou título = 0,51 UI/ml. O grupo que recebeu dose de reforço 30 dias após primo-vacinação apresentou, dois meses depois, 21 animais com títulos > 0,5UI/ml. Aos 180 dias, 17 (80,9% soros apresentaram títulos > 0,5UI/ml; aos 270 dias, 15 (71,4% soros com títulos 30,5UI/ml; aos 360 dias, 4 (19,0% com títulos 30,5UI/ml. O reforço proporcionou nível elevado de anticorpos, por um período de três meses ou mais e, 240 dias após a revacinação, 71,4% dos animais apresentou títulos 30,5UI/ml.

  3. Terapia com inibidor da ECA com dosagens relativamente altas e risco de agravamento renal na insuficiência cardíaca crônica ACE-inhibitor therapy at relatively high doses and risk of renal worsening in chronic heart failure

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    Renato De Vecchis

    2011-12-01

    Full Text Available FUNDAMENTO: O efeito renoprotetor dos inibidores da ECA vem sendo questionado no caso de diminuição do volume circulante efetivo, como na insuficiência cardíaca crônica direita ou biventricular. Objetivo: Detectar os preditores clínicos de agravamento renal na população de pacientes com ICC, caracterizado por dois tipos de regime de dosagem de inibidores da ECA. MÉTODOS: De acordo com um desenho de coorte retrospectiva, seguimos dois grupos de pacientes com ICC - tanto direita quanto biventricular -, todos na classe III da NYHA, tratados com inibidores da ECA (enalapril ou lisinopril, e com fração de ejeção do ventrículo esquerdo (FEVE 10 mg por dia de enalapril ou lisinopril. A disfunção renal agravada (ARD foi definida pelo aumento de Cr > 30% com relação ao segmento basal. O modelo de risco proporcional de Cox foi utilizado para identificar os preditores da ARD entre as seguintes variáveis: os inibidores da ECA com "alta" dosagem, idade, FEVE basal, histórico de repetidas terapias intensivas com diuréticos de alça por via intravenosa (diurético intravenoso, diabete, Cr basal, histórico de hipertensão, pressão arterial sistólica BACKGROUND: Renoprotective effect of ACE-inhibitors has been questioned in case of decreased effective circulating volume, like in right or biventricular chronic heart failure. OBJECTIVE: To detect clinical predictors of renal worsening in CHF patient population characterized by two types of ACE-inhibitor dosing regimens. METHODS: According to a retrospective cohort design, we followed 2 groups of patients with CHF - whether right or biventricular -, all in III NYHA class treated with ACE-inhibitors (enalapril or lisinopril, and with left ventricular ejection fraction (LVEF 10 mg per day of enalapril or lisinopril. Worsened renal failure (ARD was defined by Cr increase >30% from baseline. Cox proportional hazards model was used to identify the predictors of ARD among the following variables

  4. Patient Safety in Drug Therapy and the Influence of the Prescription in Dose Errors Seguridad del paciente en la terapéutica medicamentosa y la influencia de la prescripción médica en los errores de dosis Segurança do paciente na terapêutica medicamentosa e a influência da prescrição médica nos erros de dose

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    Fernanda Raphael Escobar Gimenes

    2010-12-01

    ineficiencia del tratamiento, comprometiendo así, la calidad de la asistencia prestada a los pacientes hospitalizados.Os objetivos foram analisar a redação da prescrição médica nos erros de doses, ocorridos em unidades de clínica médica de cinco hospitais brasileiros, e identificar as classes farmacológicas envolvidas nesses erros. Este é estudo descritivo que utilizou dados secundários, obtidos de pesquisa multicêntrica, realizada em 2005. A população foi composta por 1425 erros de medicação e a amostra por 215 erros de doses. Desses, 44,2% ocorreram no hospital E. Verificou-se presença de siglas e/ou abreviaturas em 96,3% das prescrições, ausência do registro do paciente em 54,4%, falta de posologia em 18,1% e omissão da data em 0,9%. Com relação ao tipo de medicamento, 16,8% eram broncodilatadores, 16,3% eram analgésicos, 12,1%, anti-hipertensivos e 8,4% eram antimicrobianos. A ausência da posologia nas prescrições pode favorecer a administração de doses erradas, resultando em ineficiência do tratamento, comprometendo a qualidade da assistência prestada aos pacientes hospitalizados.

  5. Inalador dosimetrado com espaçador artesanal versus nebulizador no tratamento da crise de sibilância na criança Metered-dose inhaler with home-made spacer versus nebulizers to treat moderate wheezing attacks in children

    Directory of Open Access Journals (Sweden)

    Liana Consuelo Santana Vilarinho

    2003-10-01

    Full Text Available OBJETIVO: Realizou-se um ensaio clínico objetivando comparar duas modalidades de administração de salbutamol na crise de sibilância em crianças - através de nebulizador de jato e através de inalador dosimetrado acoplado a um espaçador artesanal. MATERIAL E MÉTODOS: Foi estudada uma amostra de conveniência de crianças em crise moderada de sibilância, alocadas aleatoriamente em dois grupos de tratamento, de acordo com o dispositivo inalatório utilizado para a administração de salbutamol (nebulizador - grupo NEB, ou inalador dosimetrado com espaçador - grupo IDE. Os parâmetros utilizados para comparação entre os grupos foram agrupados em tabela de pontos e consistiram em sinais clínicos habitualmente usados na avaliação da gravidade da crise asmática (nível de consciência, coloração da pele, intensidade da dispnéia, intensidade da tiragem, tempo expiratório, entrada de ar e sibilância e a saturação transcutânea de oxigênio, obtidos antes do tratamento e 15 minutos após cada administração do salbutamol. Como dados adicionais, mediram-se os tempos de preparo e de uso das medicações, computaram-se os custos envolvidos nas duas formas de tratamento, e interrogaram-se os acompanhantes sobre o grau de satisfação em relação aos tratamentos. Cada criança usou salbutamol em doses repetidas a cada 20 minutos, interrompendo-se a administração quando a crise passava de moderada a leve. Quando a crise persistia moderada, após a segunda dose de salbutamol, acrescentava-se corticóide oral. A participação das crianças era concluída quando elas passavam à crise leve, ou após a terceira dose de salbutamol. A dose de salbutamol usada no grupo IDE foi 1/3 da dose usada no grupo NEB. RESULTADOS: Participaram do estudo 54 crianças com idades que variaram de 22 dias a 11,7 anos. Cada grupo abrangeu 27 crianças. Os grupos não diferiram demograficamente e em relação à pontuação clínica e aos valores de

  6. Brain tissue oxidative damage as a possible mechanism for the deleterious effect of a chronic high dose of estradiol on learning and memory in ovariectomized rats Dano oxidativo ao tecido cerebral como possível mecanismo de efeito deletério da alta dose crônica de estradiol no aprendizado e memória de ratas ooforectomizadas

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    Fatimeh Khodabandehloo

    2013-05-01

    Full Text Available In addition to antioxidative effects, estrogens also exert pro-oxidative actions. The effect of chronic administration of a high dose of estradiol valerate on Morris water maze tasks and brain tissues oxidative damage was investigated. The Sham-Est and OVX-Est groups were treated with estradiol valerate (4 mg/kg for 12 weeks. Escape latency and traveled path in the Sham-Est and OVX-Est groups were significantly higher than in the Sham and OVX groups (p≪0.01 and p≪0.001. In the probe trial, the animals of the Sham-Est and OVX-Est groups spent lower time in Q1 compared to Sham and OVX groups (p≪0.05 and p≪0.001. In Sham-Est and OVX-Est groups, the brain tissue total thiol concentration was significantly lower, and malondialdehyde (MDA concentrations were higher than in the Sham and OVX groups (p≪0.05 and p≪0.001. It is concluded that administration of high exogenous levels of estradiol impairs performance and enhances oxidative stress.Além dos efeitos antioxidantes, os estrógenos também têm ação pró-oxidativa. Foi investigado o efeito da administração crônica de alta dose de valereato de estradiol no desempenho do labirinto aquático de Morris e o dano oxidativo ao tecido cerebral. Os grupos Sham-Est e OVX-Est foram tratados com valereato de estradiol (4 mg/kg por 12 semanas. O tempo de latência para escapada e o caminho percorrido foram significativamente maiores nos grupos Sham-Est e OVX-Est em relação aos grupos Sham e OVX (p≪0,01 e p≪0,001. No estudo probe, os animais dos grupos Sham-Est e OVX-Est levaram menos tempo no Q1 em comparação aos grupos Sham e OVX (p≪0,05 e p≪0,001. Nos grupos Sham-Est e OVX-Est, a concentração total de tiol foi significativamente menor, enquanto a concentração de malondialdehydo (MDA for maior do que aquela dos grupos Sham e OVX (p≪0,05 e p≪0,001. Concluiu-se que a administração de altas doses de estradiol exógeno compromete o desempenho e aumenta o estresse oxidativo

  7. Different doses of exogenous surfactant for treatment of meconium aspiration syndrome in newborn rabbits Estudo dos efeitos de diferentes doses de surfactante exógeno para o tratamento da síndrome de aspiração de mecônio em coelhos recém-nascidos

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    João Cesar Lyra

    2004-01-01

    Full Text Available OBJECTIVE: To evaluate the effects of 2 different doses of exogenous surfactant on pulmonary mechanics and on the regularity of pulmonary parenchyma inflation in newborn rabbits. METHOD: Newborn rabbits were submitted to tracheostomy and randomized into 4 study groups: the Control group did not receive any material inside the trachea; the MEC group was instilled with meconium, without surfactant treatment; the S100 and S200 groups were instilled with meconium and were treated with 100 and 200 mg/kg of exogenous surfactant (produced by Instituto Butantan respectively. Animals from the 4 groups were mechanically ventilated during a 25-minute period. Dynamic compliance, ventilatory pressure, tidal volume, and maximum lung volume (P-V curve were evaluated. Histological analysis was conducted using the mean linear intercept (Lm, and the lung tissue distortion index (SDI was derived from the standard deviation of the means of the Lm. One-way analysis of variance was used with a = 0.05. RESULTS: After 25 minutes of ventilation, dynamic compliance (mL/cm H2O · kg was 0.87 ± 0.07 (Control; 0.49 ± 0.04 (MEC*; 0.67 ± 0.06 (S100; and 0.67 ± 0.08 (S200, and ventilatory pressure (cm H2O was 9.0 ± 0.9 (Control; 16.5 ± 1.7 (MEC*; 12.4 ± 1.1 (S100; and 12.1 ± 1.5 (S200. Both treated groups had lower Lm values and more homogeneity in the lung parenchyma compared to the MEC group: SDI = 7.5 ± 1.9 (Control; 11.3 ± 2.5 (MEC*, 5.8 ± 1.9 (S100; and 6.7 ± 1.7 (S200 (*P OBJETIVO: Avaliar os efeitos de duas diferentes doses de surfactante exógeno sobre a mecânica pulmonar e sobre a regularidade da expansão do parênquima pulmonar em coelhos recém-nascidos. MÉTODO: Coelhos recém-nascidos foram traqueostomizados e randomizados em quatro grupos de estudo: grupo-Controle, sem aspiração de mecônio; grupo MEC, com aspiração de mecônio e sem tratamento com surfactante exógeno; grupos S100 e S200, ambos com aspiração de mecônio e tratados

  8. Dose limits

    International Nuclear Information System (INIS)

    Fitoussi, L.

    1987-12-01

    The dose limit is defined to be the level of harmfulness which must not be exceeded, so that an activity can be exercised in a regular manner without running a risk unacceptable to man and the society. The paper examines the effects of radiation categorised into stochastic and non-stochastic. Dose limits for workers and the public are discussed

  9. Desfechos clínicos do tratamento de tuberculose utilizando o esquema básico recomendado pelo Ministério da Saúde do Brasil com comprimidos em dose fixa combinada na região metropolitana de Goiânia Clinical treatment outcomes of tuberculosis treated with the basic regimen recommended by the Brazilian National Ministry of Health using fixed-dose combination tablets in the greater metropolitan area of Goiânia, Brazil

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    Anna Carolina Galvão Ferreira

    2013-02-01

    Full Text Available OBJETIVO: Descrever as taxas de cura, falência e abandono do tratamento da tuberculose com o esquema básico preconizado pelo Ministério da Saúde (tratamento com rifampicina, isoniazida, pirazinamida e etambutol por dois meses seguido de isoniazida e rifampicina por quatro meses utilizando comprimidos em dose fixa combinada em regime autoadministrado e descrever os eventos adversos e seus possíveis impactos nos desfechos do tratamento. MÉTODOS: Estudo descritivo utilizando dados coletados prospectivamente dos prontuários médicos de pacientes com tuberculose (idade > 18 anos tratados com o esquema básico em duas unidades básicas de saúde da região metropolitana de Goiânia, GO. RESULTADOS: A amostra foi composta por 40 pacientes com tuberculose. A taxa de cura foi de 67,5%, a taxa de abandono foi de 17,5%, e não ocorreram casos de falência. Nessa amostra, 19 pacientes (47% relataram reações adversas aos medicamentos. Essas foram leves e moderadas, respectivamente, em 87% e 13% dos casos. Em nenhum caso houve necessidade de mudança do esquema ou suspensão do tratamento. CONCLUSÕES: A taxa de cura do esquema básico com o uso de comprimidos em dose fixa combinada sob regime autoadministrado foi semelhante às taxas históricas do esquema anterior. A taxa de abandono, na amostra estudada, foi muito acima da taxa preconizada como adequada (até 5%.OBJECTIVE: To describe the rates of cure, treatment failure, and treatment abandonment obtained with the basic regimen recommended by the Brazilian National Ministry of Health (rifampin, isoniazid, pyrazinamide, and ethambutol for two months, followed by isoniazid and rifampin for four months involving the use of fixed-dose combination tablets (self-administered treatment, as well as to describe adverse events and their potential impact on treatment outcomes. METHODS: This was a descriptive study based on prospective data obtained from the medical records of tuberculosis patients (> 18

  10. Weldon Spring dose calculations

    International Nuclear Information System (INIS)

    Dickson, H.W.; Hill, G.S.; Perdue, P.T.

    1978-09-01

    In response to a request by the Oak Ridge Operations (ORO) Office of the Department of Energy (DOE) for assistance to the Department of the Army (DA) on the decommissioning of the Weldon Spring Chemical Plant, the Health and Safety Research Division of the Oak Ridge National Laboratory (ORNL) performed limited dose assessment calculations for that site. Based upon radiological measurements from a number of soil samples analyzed by ORNL and from previously acquired radiological data for the Weldon Spring site, source terms were derived to calculate radiation doses for three specific site scenarios. These three hypothetical scenarios are: a wildlife refuge for hunting, fishing, and general outdoor recreation; a school with 40 hr per week occupancy by students and a custodian; and a truck farm producing fruits, vegetables, meat, and dairy products which may be consumed on site. Radiation doses are reported for each of these scenarios both for measured uranium daughter equilibrium ratios and for assumed secular equilibrium. Doses are lower for the nonequilibrium case

  11. Fixação biológica de nitrogênio e aspectos agronômicos da soja (Glycine max (L. Merr. sob diferentes doses de inoculante

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    Alessandro Pedrozo

    2018-04-01

    Full Text Available A soja é uma das oleaginosas mais importantes no mundo e possui grande versatilidade. O objetivo deste estudo foi estudar o efeito da inoculação de 600 e 1200 mL ha–1 de um inoculante líquido com Bradyrhizobium japonicum e com ou sem adição de 1 L de cálcio ha–1 (Ca 41% e de 0,4 L de boro ha–1 (B 14% na cultura da soja. As plantas foram crescidas por 90 dias em potes plásticos com 3 kg de areia: vermiculita (v:v autoclavados (121ºC, 1 h. O experimento foi conduzido em delineamento inteiramente casualizado, com 5 repetições em casa de vegetação. Foram determinados parâmetros relacionados com o desenvolvimento e produtividade da soja, como: a massa seca da parte aérea, de raízes e total, nitrogênio da parte aérea, número e massa seca de nódulos, índice de clorofila das folhas, número de vagens por planta (NVPL, número de grãos por vagens (NGV e número de grãos por planta (NGPL. A adição de Ca+B aumentou significantemente NVPL, NGPL e NGV. O NVPL, NGPL foram aumentados significantemente com a adição de 600 mL ha–1 inoculante. A adição de 600 mL ha–1 inoculante juntamente com a adição de Ca+B estimulou significativamente o NVPL, NGPL e NGV. Conclui- se que a produtividade da cultura da soja foi aumentada com a adição de 600 mL ha–1 inoculante juntamente com a adição de Ca e B.

  12. Controllable dose

    International Nuclear Information System (INIS)

    Alvarez R, J.T.; Anaya M, R.A.

    2004-01-01

    With the purpose of eliminating the controversy about the lineal hypothesis without threshold which found the systems of dose limitation of the recommendations of ICRP 26 and 60, at the end of last decade R. Clarke president of the ICRP proposed the concept of Controllable Dose: as the dose or dose sum that an individual receives from a particular source which can be reasonably controllable by means of any means; said concept proposes a change in the philosophy of the radiological protection of its concern by social approaches to an individual focus. In this work a panorama of the foundations is presented, convenient and inconveniences that this proposal has loosened in the international community of the radiological protection, with the purpose of to familiarize to our Mexican community in radiological protection with these new concepts. (Author)

  13. Determination of photon contamination dose of clinical electron beams using the generalized simulated annealing method; Determinação da dose dos fótons contaminantes de feixes de elétrons clínicos usando o Método de Recozimento Simulado Generalizado

    Energy Technology Data Exchange (ETDEWEB)

    Visbal, Jorge H. Wilches; Costa, Alessandro M. da, E-mail: jhwilchev@gmail.com [Universidade de Sao Paulo (USP), Ribeirão Preto, SP (Brazil). Faculdade de Filosofia, Ciências e Letras

    2017-07-01

    Clinical electron beams are composed of a mixture of pure electrons and Bremsstrahlung photons produced in the structures of the accelerator head as well as in the air. Accurate knowledge of these components is important for calculating the dose and for treatment planning. There are at least two approaches to deter-mine the contribution of the photons in the percentage depth dose of clinical electrons: a) Analytical Method that calculates the dose of the photons from the previous determination of the spectrum of the incident Bremsstrahlung photons; b) Adjustment method based on a semi-empirical biexponential formula where four parameters must be established from optimization methods. The results show that the generalized simulated annealing method can calculate the photon contamination dose by overestimating the dose in the tail no more than 0.6% of the maximum dose (electrons and photons). (author)

  14. Produção e composição mineral da beterraba sob doses de sódio e potássio, em solução nutritiva

    OpenAIRE

    Carvalho, Karina Fernandes

    2014-01-01

    Altas concentrações de sódio podem diminuir o rendimento de diversas culturas. Entretanto o sódio é um elemento benéfico à beterraba, podendo substituir as funções do potássio. Estudos mostraram que o sódio é responsável pelo aumento da produção de beterraba açucareira e hortícola. O presente trabalho objetivou verificar a resposta da nutrição com sódio em substituição e em adição à nutrição potássica sobre o crescimento, produção, composição mineral e a relação do sódio com os macronutriente...

  15. Crescimento, desenvolvimento e retardamento da senescência foliar em girassol de vaso (Helianthus annuus L.: fontes e doses de nitrogênio Growth, development and delay of leaf senescence in pot-grown sunflower (Helianthus annuus L.: sources and rates of nitrogen

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    Joelma Dutra Fagundes

    2007-08-01

    Full Text Available O girassol é a quarta oleaginosa em produção de grãos no mundo e alguns genótipos são usados com finalidade ornamental para flor de corte e de vaso (girassol de vaso. O objetivo do trabalho foi avaliar o efeito de diferentes fontes e doses de nitrogênio sobre alguns parâmetros de crescimento, desenvolvimento e no retardamento da senescência das folhas basais em girassol de vaso. Um experimento foi conduzido em casa de vegetação, em Santa Maria, RS. Os tratamentos foram: uréia, nitrato de amônio e nitrato de cálcio nas doses de 0, 50, 100 e 150mg L-1 de N na solução de fertirrigação, com duas aplicações semanais. O experimento foi um bi-fatorial (fontes e doses de N no delineamento inteiramente casualizado, com seis repetições. Cada repetição foi um vaso no 15 (1,3L, 15cm de altura com uma planta por vaso. As variáveis analisadas foram: número final de folhas, altura final de plantas, porcentagem de folhas senescentes no ponto de venda, porcentagem de folhas senescentes no final de vida de vaso, área foliar total da planta, filocrono e a soma térmica acumulada da emergência ao botão visível e da emergência ao ponto de venda. A fonte de N tem influência sobre a área foliar do girassol de vaso, sendo a uréia recomendável para o maior crescimento das folhas. A dose de N em torno de 100mg L-1 aplicada duas vezes por semana via fertirrigação favorece características desejáveis para a comercialização, como precocidade e retardamento da senescência das folhas.Sunflower is the fourth oil grain crop grown worldwide and some genotypes are used with ornamental purpose as cut and pot-grown flower. The objective of this study was to evaluate the effect of different sources and rates of nitrogen on some growth and developmental parameters, and on the delay of leaf senescence in pot-grown sunflower. An experiment was carried out inside a greenhouse in Santa Maria, RS, Brazil. Treatments were: urea, ammonium nitrate and

  16. Dose preparatória de atracúrio: aferição da fadiga no músculo orbicular do olho e condições de intubação orotraqueal Dosis preparatoria de atracurio: comparación de la fatiga en el músculo orbicular del ojo y condiciones de intubación orotraqueal Priming dose of atracurium: measuring orbicularis oculi muscle fade and tracheal intubation conditions

    Directory of Open Access Journals (Sweden)

    Giovani de Figueiredo Locks

    2003-12-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O método da dose preparatória (priming principle consiste na injeção de uma pequena dose do bloqueador neuromuscular, minutos antes da administração do restante da dose preconizada para intubação traqueal, para encurtar o início de ação dos bloqueadores neuromusculares (BNM adespolarizantes. Existe, porém, possibilidade de fadiga muscular e broncoaspiração. De interesse especial para as manobras de intubação orotraqueal e proteção das vias aéreas, são os músculos da laringe. Como sua monitorização direta impõe dificuldades técnicas, foi demonstrado que o músculo orbicular do olho apresenta correlação com os músculos laríngeos quanto à sensibilidade aos BNM. O objetivo desta pesquisa é avaliar se há fadiga do músculo orbicular ocular após o uso da dose preparatória de atracúrio e comparar as condições clínicas de intubação traqueal após dois intervalos entre as doses. MÉTODO: Foram selecionados 35 pacientes adultos, estado físico ASA I ou II, sem fatores de risco para broncoaspiração, submetidos à cirurgia eletiva. Foi induzida anestesia geral com alfentanil e propofol e os pacientes foram ventilados manualmente sob máscara. Em seguida, foram posicionados os eletrodos para estimular o ramo temporal do nervo facial e o transdutor de aceleração no músculo orbicular do olho. Administrou-se a dose preparatória de atracúrio (0,02 mg.kg-1 e a relação T4/T1 foi avaliada a cada minuto durante 5 minutos em 20 casos (G1 e 7 minutos em 13 casos (G2. Após este intervalo, administrou-se a dose complementar de atracúrio (0,5 mg.kg-1 e procedeu-se a intubação orotraqueal após um minuto. Foi considerada fadiga clinicamente importante a relação T4/T1 inferior a 0,9. RESULTADOS: Nenhum paciente apresentou fadiga durante o intervalo de monitorização. Em 80% e 69% dos pacientes de G1 ou G2, respectivamente, as condições de intubação traqueal foram consideradas

  17. Dose and dose rate monitor

    International Nuclear Information System (INIS)

    Novakova, O.; Ryba, J.; Slezak, V.; Svobodova, B.; Viererbl, L.

    1984-10-01

    The methods are discussea of measuring dose rate or dose using a scintillation counte. A plastic scintillator based on polystyrene with PBD and POPOP activators and coated with ZnS(Ag) was chosen for the projected monitor. The scintillators were cylindrical and spherical in shape and of different sizes; black polypropylene tubes were chosen as the best case for the probs. For the counter with different plastic scintillators, the statistical error 2σ for natural background was determined. For determining the suitable thickness of the ZnS(Ag) layer the energy dependence of the counter was measured. Radioisotopes 137 Cs, 241 Am and 109 Cd were chosen as radiation sources. The best suited ZnS(Ag) thickness was found to be 0.5 μm. Experiments were carried out to determine the directional dependence of the detector response and the signal to noise ratio. The temperature dependence of the detector response and its compensation were studied, as were the time stability and fatigue manifestations of the photomultiplier. The design of a laboratory prototype of a dose rate and dose monitor is described. Block diagrams are given of the various functional parts of the instrument. The designed instrument is easiiy portable, battery powered, measures dose rates from natural background in the range of five orders, i.e., 10 -2 to 10 3 nGy/s, and allows to determine a dose of up to 10 mGy. Accouracy of measurement in the energy range of 50 keV to 1 MeV is better than +-20%. (E.S.)

  18. Preliminary study of the distribution of dose in patients with Graves' disease undergoing examination of uptake of iodine-131 using Monte Carlo simulation; Estudo preliminar da distribuicao de dose em pacientes com doenca de Graves submetidos a exame de captacao de iodo-131 utilizando simulacao Monte Carlo

    Energy Technology Data Exchange (ETDEWEB)

    Schwarcke, Marcelo; Marques, Tatiana; Nicolucci, Patricia; Baffa, Oswaldo, E-mail: mschwarcke@usp.b [Universidade de Sao Paulo (FFCLRP/USP), Ribeirao Preto, SP (Brazil). Faculdade de Filosofia, Ciencias e Letras. Dept. de Fisica e Matematica; Bornemann, Clarissa [Hospital de Caridade Astrogildo de Azevedo, Santa Maria, RS (Brazil). Servico de Medicina Nuclear de Santa Maria

    2010-06-15

    Patients with Graves disease have a high hormonal disorder, which causes behavioral changes. One way to treat this disease is the use of high doses of {sup 131} Iodine, requiring that the patient carries out the examination of {sup 131}I uptake to estimate the activity to be administered. Using these data capture and compared with the simulated data using the Monte Carlo code PENELOPE is possible to determine a distribution of dose to the region surrounding the thyroid. As noted the difference between the simulated values and the experimentally obtained were 10.36%, thus showing the code of simulation for accurate determination of absorbed dose in tissue near the thyroid. (author)

  19. Dose and induction to cancer risk evaluation associated to use of X ray body scanners by transmission at airports; Avaliacao da dose e do risco de inducao ao cancer associados ao uso de escaneres corporais de raios X por transmissao em aeroportos

    Energy Technology Data Exchange (ETDEWEB)

    Correa, Samanda Cristine Arruda; Aquino, Josilto Oliveira de, E-mail: scorrea@cnen.gov.b, E-mail: josilto@cnen.gov.b [Comissao Nacional de Energia Nuclear (DIAPI/CGMI/CNEN), Rio de Janeiro, RJ (Brazil). Coordenacao Geral de Instalacoes Medicas e Industriais. Div. de Aplicacoes Industriais; Souza, Edmilson Monteiro de, E-mail: emonteiro@nuclear.ufrj.b [Centro Universitario Estadual da Zona Oeste (CAPI/UEZO), Campo Grande, RJ (Brazil). Colegiado da Area de Producao Industrial; Silva, Ademir Xavier da, E-mail: ademir@nuclear.ufrj.b [Coordenacao dos Programas de Pos-Graduacao de Engenharia (PEN/COPPE/UFRJ), RJ (Brazil). Programa de Engenharia Nuclear

    2011-07-01

    This paper uses the Monte Carlo MCNPX and the phantoms in male voxel and female voxel to evaluate the absorbed doses effective doses and the induction risk and the mortality due to cancer associated to exposures of individual submitted to X ray body scanners by transmission at various projections. The values of effective dose were calculated according to the recommended by the new ICRP 103 and the values of induction risks and mortality due to cancer were estimated through the document BEIR VII. (author)

  20. Evaluation of the use of a Business Intelligence system for management of patient radiation dose undergone to nuclear medicine exams; Avaliação do uso de um sistema de Business Intelligence para gerenciamento da dose de pacientes submetidos a exames de medicina nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Fischer, A.C.F.S.; Capaverde, A.S.; Moreira, M.N.; Moraes, A.L.; Andrade, J.R.M.; Bacelar, A., E-mail: acfischer@hcpa.edu.br [Hospital de Clínicas de Porto Alegre (HCPA), RS (Brazil). Serviço de Física Médica e Radioproteção

    2017-07-01

    The feasibility of using a Business Intelligence (BI) system, IMPAX BI (Agfa), to manage the effective radiation dose of patients undergoing Nuclear Medicine exams was evaluated. The evaluation was divided into four stages, using retrospective data from the activity administered to adult patients in the year 2016. It was possible with the system to create panels to filter the data by date and display them in table and / or graphs, indicating the estimated doses and established limits. The IMPAX BI system proved to be a tool capable of assisting in dose management in Nuclear Medicine since it facilitates the identification of cases in which the patient is submitted to doses higher than those defined in the protocols of exams.

  1. Study of the equivalent dose distribution in organs and tissues using periapical odontological radiography; Estudo da distribuição de dose equivalente em órgãos e tecidos em procedimento de radiografia odontológica periapical

    Energy Technology Data Exchange (ETDEWEB)

    Santos, H.F.S.; Cipeli, J.F.; Fortes, M.A.B.; Federico, C.A., E-mail: hannasantana.f@gmail.com [Instituto de Estudos Avançados (IEAv), São José dos Campos, SP (Brazil). Divisão de Física Aplicada; Bissoli, C.F. [Universidade Paulista (UNIP), São José dos Campos, SP (Brazil)

    2017-07-01

    In this article presents a study of the doses obtained in periapical odontological radiography in main tissues of the head, using thermoluminescent dosemeters of type TLD-700H applied to a anthropomorphic simulator. The results indicate that the skin and salivary glands received the highest doses and the risk of calculated injury was 1.44 x 10{sup -6} Sv{sup -1} per radiograph.

  2. Avaliação da tolerância e nefrotoxicidade do antimonial pentavalente administrado na dose de 40mg Sb v/kg/dia, de 12/12h, por 30 dias na forma cutaneo-mucosa de leishmaniose

    Directory of Open Access Journals (Sweden)

    Raimunda N.R. Sampaio

    1997-12-01

    Full Text Available Foi avaliada a função renal de 11 pacientes com leishmaniose cutâneo-mucosa tratados com antimonial pentavalente na dose de 40mg SbV/kg/dia aplicada de 12/12 horas, em esquema contínuo, durante trinta dias. No estudo, um paciente apresentou insuficiência renal reversível e dois desenvolveram alterações enzimáticas hepáticas e eletrocardiográficas sendo o esquema terapêutico interrompido. Nos demais pacientes observou-se efeitos nefrotóxicos tais como diminuição da taxa de filtração glomerular, diminuição da capacidade de concentração urinária, avaliada por um jejum hídrico de 16 horas e aumento na fração de excreção de sódio. No exame do sedimento urinário observou-se um aumento no número de leucócitos e cilindros. Os resultados encontrados neste estudo sugerem que o tratamento com antimonial pentavalente na dose de 40mg SbV/kg/dia foi menos tolerado em virtude de seus efeitos tóxicos, não parecendo apresentar índice de cura superior ao esquema atualmente preconizado de 20mg SbV/kg/dia.The renal function of eleven patients with mucocutaneous leishmaniasis was analyzed in a prospective study realized at the School Hospital of University of Brasília. The patients were treated with doses of 40mg/kg/day of pentavalent antimony (SbV, in a continuous scheme during thirty days. In this study three patients were excluded, one patient with reversible renal failure and two patients with hepatic and cardiac malfunctions. In the other eight patients, severe nephrotoxics effects were observed, like reduction of glomerular filtration rate, reduction of the urinary concentration capacity, evaluated by a sixteen hours hydric fasting and an increase of sodium fractional excretion. An increase in the number of leucocytes and cylinders were observed at the urinary sediment exam. Finally, the results shows that the treatment with pentavalent antimony in doses of 40mg Sb/kg/day was less tolerated on account of its renal toxics

  3. Avaliação da resposta bioquímica no câncer inicial de próstata: experiência uninstitucional comparando teleterapia exclusiva ou associada à braquiterapia de alta taxa de dose Evaluation of biochemical response on early prostate cancer: comparison between treatment with external beam radiation alone and in combination with high-dose rate conformal brachytherapy boost

    Directory of Open Access Journals (Sweden)

    Douglas Guedes de Castro

    2004-08-01

    Full Text Available OBJETIVO: Análise comparativa da resposta bioquímica em pacientes submetidos à teleterapia exclusiva ou associada à braquiterapia de alta taxa de dose para tumores localizados da próstata. MATERIAIS E MÉTODOS: De novembro de 1997 a janeiro de 2000, 74 pacientes foram submetidos à teleterapia com 45 Gy e reforço com braquiterapia de alta taxa de dose com irídio-192 e dose de 16 Gy em quatro inserções (BT. Estes foram comparados a 29 pacientes submetidos à teleterapia com 45 Gy e reforço com arcoterapia e dose mediana de 24 Gy (RT entre outubro de 1996 e fevereiro de 2000. Nos dois grupos houve associação ocasional de hormonioterapia neoadjuvante. Sobrevida atuarial livre de doença em três anos (SB3 e fatores prognósticos pré-tratamento da resposta bioquímica, como o antígeno prostático-específico inicial (PSAi, escore de Gleason da biópsia de próstata (EG e estádio clínico (EC, foram analisados. RESULTADOS: O seguimento mediano foi de 25 meses para o grupo RT e 37 meses para o BT. Na análise atuarial, a SB3 foi de 51% e 73% (p = 0,032 para RT e BT, respectivamente. Na análise estratificada pelo PSAi, a SB3 para RT e BT foi de 85,7% e 79,1% (p = 0,76 para PSAi 10 ng/mL, respectivamente. Quando estratificado pelo EG, a SB3 para RT e BT foi de 37% e 80% (p = 0,001 para EG 6 (p = 0,58; estratificando-se pelo EC, a SB3 para RT e BT foi de 36% e 74% (p = 0,018 para EC T2a (p = 0,692, respectivamente. O risco relativo bruto de recidiva bioquímica foi de 2,3 (95% IC: 1,0-5,1 para os pacientes tratados com RT, em relação à BT; quando ajustado pelo PSAi e EG, o risco relativo de recidiva bioquímica foi de 2,4 (95% IC: 1,0-5,7. CONCLUSÃO: A modalidade de tratamento foi fator prognóstico independente de recidiva bioquímica, com maior controle bioquímico associado à BT. Nossos resultados preliminares sugerem que o maior benefício com BT foi obtido nos pacientes com PSAi > 10 ng/mL, EC OBJECTIVE: To compare the

  4. COMPORTAMENTO DOS PARÂMETROS INDICATIVOS DE PRODUÇÃO DA BANANEIRA PACOVAN SUBMETIDA A DIFERENTES LÂMINAS DE IRRIGAÇÃO E DOSES DE POTÁSSIO NA CHAPADA DO APODI - LIMOEIRO DO NORTE-CE

    Directory of Open Access Journals (Sweden)

    SOLERNE CAMINHA COSTA

    2009-01-01

    Full Text Available The study was to evaluate the effect of the combination of different irrigation levels and rates of potassium applied drip on parameters indicative of the banana production Pacovan Apodi (var. SH3640. The experimental design was a randomized complete block with split plot and 3 replications. The treatments consisted of a combination of five layers of irrigation and drainage lysimeter by means for four doses of potassium applied by fertirrigation. The variables were the weight of the bunch without stalk, the number of hands in the bunch, the weight of the hand of the central cluster and the number of fruits of the central cluster of the bunch. The data were obtained from the harvest of the first two cycles of the experiment, from March 2006 to September 2007. The treatments with irrigation levels influenced in all tested parameters of production, while the doses of potassium only influenced the weight of the bunch without stalk.

  5. Financial impact of outpatient clinic radioiodine therapy with sodium iodide I-131 for the treatment of patients with differentiated low-risk thyroid carcinoma in relation to hospital doses; Impacto financeiro da radioiodoterapia ambulatorial com iodeto de sódio I-131 para tratamento de pacientes com carcinoma diferenciado da tireóide de baixo risco em relação às doses hospitalares

    Energy Technology Data Exchange (ETDEWEB)

    Berenguer, P.F.; Chang, T.M.C.; Silva, R.A.M.; Neto, A.H.D.; Belo, I.B., E-mail: pricilaberenguer@gmail.com [Instituto de Medicina Integral Professor Fernando Figueira, Recife, PE (Brazil). Serviço de Medicina Nuclear; Santos, M.A.P. [Centro Regional de Ciências Nucleares do Nordeste (CRCN-NE/CNEN-PE), Recife (Brazil). Coordenação de Radioproteção

    2017-07-01

    Differential thyroid carcinoma (CDT) is the most prevalent endocrine malignancy in the world, with an excellent prognosis and a 10-year survival rate of over 95%. By 2013, the lowest activity of I-131 authorized by the Brazilian Unified Health System (SUS) in the therapy of patients with low-risk CDT was 3,700 MBq, requiring hospitalization. Recent studies have shown similar effectiveness between low and high doses of I-131 in the treatment of low-risk CDT. In 2014, the Ministry of Health included in the list of SUS procedures the use of lower activities (1,110 MBq and 1,850 MBq) for this purpose. The Brazilian National Nuclear Energy Commission (CNEN) also authorized the outpatient use of activity up to 1,850 MBq of I-131. Objective: To evaluate the financial impact of the adoption of ambulatory radioiodine therapy in patients with CDT of low-risk when compared to the hospital dose. Methods: Analysis of patients with CDT low-risk who were treated with an outpatient dose of I-131 from August / 2014 to January / 2017 at a nuclear medicine service in Recife, PE, Brazil. The cost of outpatient versus hospital doses was calculated. Results: A total of 289 patients underwent low doses of iodine therapy were evaluated, resulting in a savings of R$227,793.80. Conclusion: Outpatient radioiodine therapy in the treatment of patients with CDT of low-risk resulted in a 61.10% reduction in SUS expense, in addition to enabling faster care.

  6. Dose rate constants for new dose quantities

    International Nuclear Information System (INIS)

    Tschurlovits, M.; Daverda, G.; Leitner, A.

    1992-01-01

    Conceptual changes and new quantities made is necessary to reassess dose rate quantities. Calculations of the dose rate constant were done for air kerma, ambient dose equivalent and directional dose equivalent. The number of radionuclides is more than 200. The threshold energy is selected as 20 keV for the dose equivalent constants. The dose rate constant for the photon equivalent dose as used mainly in German speaking countries as a temporary quantity is also included. (Author)

  7. Avaliação da eficácia e segurança da associação de budesonida e formoterol em dose fixa e cápsula única no tratamento de asma não controlada: ensaio clínico randomizado, duplo-cego, multicêntrico e controlado Evaluation of the efficacy and safety of a fixed-dose, single-capsule budesonide-formoterol combination in uncontrolled asthma: a randomized, double-blind, multicenter, controlled clinical trial

    Directory of Open Access Journals (Sweden)

    Roberto Stirbulov

    2012-08-01

    Full Text Available OBJETIVO: Avaliar a eficácia e a segurança da associação de budesonida e formoterol em dose fixa e cápsula única, em comparação ao uso de budesonida isolada em pacientes com asma não controlada. MÉTODOS: Ensaio clínico randomizado, duplo-cego, multicêntrico, de fase III, com grupos paralelos, comparando a eficácia de curto prazo e a segurança da formulação em pó de budesonida (400 µg e formoterol (12 µg com a formulação em pó de budesonida (400 µg em 181 participantes com asma não totalmente controlada. A idade dos participantes variou de 18-77 anos. Após um período de run-in de 4 semanas, durante o qual todos os participantes receberam budesonida duas vezes por dia, houve a randomização para um dos tratamentos do estudo. O tratamento foi administrado duas vezes ao dia por 12 semanas. Os principais desfechos foram VEF1, CVF e PFE matinal. Os dados foram analisados por intenção de tratar. RESULTADOS: O grupo tratado com a associação, quando comparado ao grupo budesonida isolado, teve uma melhora significativa no VEF1 (0,12 L vs. 0,02 L; p = 0.0129 e no PFE matinal (30,2 L/min vs. 6,3 L/min; p = 0,0004. Esses efeitos foram acompanhados por boa tolerabilidade e segurança, como demonstrado pela baixa frequência de eventos adversos menores. CONCLUSÕES: A associação em cápsula única de budesonida e formoterol mostrou ser eficaz e segura. Os resultados demonstram que essa formulação é uma opção terapêutica válida para a obtenção e manutenção do controle da asma.OBJECTIVE: To evaluate the efficacy and safety of a fixed-dose, single-capsule budesonide-formoterol combination, in comparison with budesonide alone, in patients with uncontrolled asthma. METHODS: This was a randomized, double-blind, multicenter, phase III, parallel clinical trial, comparing the short-term efficacy and safety of the combination of budesonide (400 µg and formoterol (12 µg, with those of budesonide alone (400 µg, both delivered

  8. Application of Laplace transform for determination of albedo type boundary conditions for neutronic calculations; Aplicacao da transformada de Laplace para determinacao de condicoes de contorno tipo albedo para calculos neutronicos

    Energy Technology Data Exchange (ETDEWEB)

    Petersen, Claudio Zen

    2008-07-01

    In this dissertation we use the Laplace transform to derive expressions for nonstandard albedo boundary conditions for one and two non-multiplying regions at the ends of one dimensional domains. In practice, the fuel regions of reactor cores are surrounded by reflector regions that reduce neutron leakage. In order to exclude the reflector regions from the calculations, we introduce a reflection coefficient or albedo. We use the present albedo boundary conditions to solve numerically slab-geometry monoenergetic and multigroup diffusion equations using the conventional finite difference method. Numerical results are generated for fixed source and eigenvalue diffusion problems in slab geometry(author)

  9. Study of the precision and trueness of the Brazilian method for ethanol and gasoline determination; Estudo da precisao e exatidao do metodo brasileiro para determinacao de etanol e gasolina

    Energy Technology Data Exchange (ETDEWEB)

    Zucchini, Ricardo R.; Hinata, Patricia [Instituto de Pesquisas Tecnologicas (IPT), Sao Paulo, SP (Brazil); Gioseffi, Carla S.; Franco, Joao B.S. [Instituto Brasileiro de Petroleo, Gas e Biocombustiveis (IBP), Rio de Janeiro, RJ (Brazil); Nascimento, Cristina R.; Torres, Eduardo S. [Agencia Nacional do Petroleo, Gas Natural e Biocombustiveis (ANP), Rio de Janeiro, RJ (Brazil)

    2008-07-01

    The determination of repeatability and reproducibility standard deviations of an analytical method, s{sub r} and s{sub R}, obtained by Interlaboratory program, makes it possible to calculate many kinds of precision limits of the method, which are needed in every laboratory's routine result comparisons and also in between-laboratories comparisons. This paper presents the results of the first interlaboratory trial, accomplished in the Brazilian petroleum sector, performed to define the trueness and precision of the Brazilian standard method for the determination of fuel anhydrous ethylic alcohol content in gasoline, that was performed by 34 experienced laboratories. The r and R values were 0,7 and 2,3 and main factors that would improve and optimize the method are presented. (author)

  10. Construction of an alternative system for the determination of sensitiveness of neutron radioisotopic primary source standardization system; Construcao de um sistema alternativo para a determinacao da sensibilidade do sistema padronizacao primaria de fontes radioisotopicas de neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Leite, Sandro Passos; Silva, Ademir Xavier da [Coordenacao dos Programas de Pos-Graduacao de Engenharia (PEN/COPPE/UFRJ), RJ (Brazil). Programa de Energia Nuclear; Pereira, Walsan Wagner; Fonseca, Evaldo S. da; Patrao, Karla C. de Souza [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil). Lab. Nacional de Metrologia das Radiacoes Ionizantes (LNMRI); Castro, Leonardo Curvello de [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil). Programa de Pos-Graduacao; Bittencourt, Guilherme Rodrigues [Comissao Nacional de Energia Nuclear (CNEN), Rio de Janeiro, RJ (Brazil). PIBIC

    2009-07-01

    This work studied, through the Monte Carlo modelling, a irradiation system for the aqueous solution MnSO{sub 4} to be used in the proceeding of determination of counting efficiency of the manganese sulfate bath

  11. Impregnation of 12-tungstophosphoric acid on silica - part I: determination of impregnation parameters, characterization and evaluation of catalytic activity; Impregnacao do acido 12-fosfotungstico em silica - parte I: determinacao de parametros de impregnacao, caracterizacao e avaliacao da atividade catalitica

    Energy Technology Data Exchange (ETDEWEB)

    Scroccaro, Karine Isabel; Tanobe, Valcineide Oliveira de Andrade; Cocco, Lilian Cristina; Yamamoto, Carlos Itsuo, E-mail: karineisabel@yahoo.com.br [Universidade Federal do Parana, Curitiba, PR (Brazil). Centro Politecnico. Dept. de Engenharia Quimica; Wypych, Fernando [Universidade Federal do Parana, Curitiba, PR (Brazil). Centro Politecnico. Dept. de Quimica

    2012-07-01

    Catalyst based on Kegging-type heteropolyacids (H{sub 3}PW{sub 12}O{sub 40} - HPA), supported on SiO{sub 2} (H{sub 3}PW), were prepared by the impregnation method under different thermal treatment conditions. The materials were characterized by different instrumental techniques and used as catalysts in the methyl esterification reactions of stearic acid. Using the catalyst with 15% of HPA, conversions higher than 60% were obtained after 2 h of reaction at 65 deg C. Recovery studies using hot-filtration with ethanol at 75 deg C showed satisfactory activity for two additional reaction cycles. (author)

  12. The use of neutron diffraction for the determination of the in-depth residual stresses profile in weld coatings; A utilizacao da difracao de neutroes na determinacao do perfil de tensoes residuais em revestimentos por soldadura

    Energy Technology Data Exchange (ETDEWEB)

    Marques, Maria Jose; Batista, A.C.; Nobre, J.P. [Universidade de Coimbra (Portugal). Dept. de Fisica. Centro de Estudos de Materiais por Difraccao de Raios X (CEMDRX); Loureiro, Altino [Universidade de Coimbra (Portugal). Dept. de Engenharia Mecanica. Centro de Engenharia Mecanica (CEMUC); Kornmeier, Joana R., E-mail: mjvaz@fe.up.pt [Technische Universitaet Muenchen, Garching (Germany). FRM II

    2013-04-15

    The neutron diffraction is a non-destructive technique, particularly suitable for the analysis of residual stress fields in welds. The technique is used in this article to study ferritic samples, coated by submerged arc welding using stainless steel filler metals. This procedure is often used for manufacturing process equipment for chemical and nuclear industries, for ease of implementation and economic reasons. The main disadvantage of that processes is the cracking phenomenon that often occurs at the interface between the base material and coatings, which can be minimized by performing post-weld stress relief heat treatments. The samples analyzed in this study were made of carbon steel plates, coated by submerged arc welding two types of stainless steel filler metals. For the first layer was used one EN 12 072 - S 2 U 23 12 electrode, while for the second and third layers were used an EN 12 072 - 19 12 3 S L electrode. After cladding, the samples were submitted to a post-weld heat treatment for 1 hour at 620 deg C. The residual stress profiles obtained by neutron diffraction evidence the relaxation of residual stress given by the heat treatment. (author)

  13. Application of neutron activation analysis for the determination of essential elements in egg samples; Aplicacao da analise por ativacao com neutrons para a determinacao de elementos essenciais em amostras de ovos

    Energy Technology Data Exchange (ETDEWEB)

    Gomes, Bruna G.; Maihara, Vera A.; Avegliano, Roseane P., E-mail: brunagabrielegomes@gmail.com, E-mail: vmaihara@ipen.br, E-mail: pagliaro@usp.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2013-07-01

    The eggs are among the twenty foods consumed by the population of the five major regions of Brazil. Among the types of eggs, there are differences in nutritional value, which can vary according to the food of the bird. This study evaluating the elements Cl, K, Mg, Mn and Na considered essential micronutrients in food, because they are fundamental in several metabolic processes necessary for the maintenance and training of the human body. We analyzed three types of eggs: egg whites, of the quail, and the colonial in cooked and raw form, using the Instrumental Neutron Activation Analysis method (INAA). The egg samples were lyophilized and pulverized before analysis. To validate the methodology, reference materials NIST RM 8415 Whole Egg Powder and NIST SRM 1567 Wheat Flour were analyzed. The samples, reference materials and standards of the elements were irradiated for 20 seconds under a thermal neutron flux of 6,6x10{sup 12} cm -2 s -1 in the nuclear research reactor IEA-R1 of IPEN-CNEN / SP. The results were consistent with the values of the Brazilian Table of Food Composition (TACO)

  14. Determination of heavy metals and other elements in sediments from Sepetiba Bay (RJ, Brazil) by neutron activation analysis; Determinacao de metais pesados e outros elementos em sedimentos da Baia de Sepetiba (RJ) por ativacao neutronica

    Energy Technology Data Exchange (ETDEWEB)

    Pellegatti, Fabio

    2000-07-01

    Sepetiba Bay, located about 60 km south of the city of Rio de Janeiro, Brazil, is one of the most important fishery areas in the State of Rio de Janeiro. A large harbor brought up a lot of industrial investment in that area. Since the 1970's, the Sepetiba region has undergone fast industrial expansion, leading to high levels of pollution by metals. For the last two decades, an industrial park composed of about 400 industrial plants, basically metallurgical, was established in the Sepetiba Bay basin, releasing its industrial waste either straight into the bay or through local rivers. Metal contamination in the bay for some metals, such as Zn, has already exceeded acceptable levels. Many authors have studied the distribution and behavior of heavy metals and another elements in the bay, but only few elements have been focused (Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn). This is probably due to the fact that the analytical technique most employed has been atomic absorption spectrometry, which is not a multi-elemental technique. In this work, Instrumental Neutron Activation Analysis (INAA) was applied to the determination of the elements As, Ba, Br, Ce, Co, Cr, Cs, Eu, Fe, Hf, La, Lu, Nd, Rb, Sc, Sm, Ta, Tb, Th, U, Yb and Zn in 28 bottom sediment samples and four sediment cores from Sepetiba Bay. The elements Co, Cr, Cs, Fe, Sc, Ta and Zn presented similar behavior in the bottom sediments, showing higher concentration along the Northern coast of the bay, where most of the fluvial water flows out to the bay. The contamination of Sepetiba Bay was also assessed by the analysis of four sediment cores. Two of them were sampled in the Eastern part of the bay, where the industrial park is located, whereas the other two were sampled in the Western part of the bay, a more preserved region. For each region, two cores were sampled within the mangrove trees and the others at the edge of the tidal flat. The results showed that, the sediments displayed higher metal concentration within the mangrove trees. The element Zn exhibited a characteristic profile of anthropogenic contamination, decreasing concentration with depth. (author)

  15. Determination of uranium and thorium isotopes and polonium in sediment profiles from Baixada Santista, SP; Determinacao de isotopos de uranio e torio e polonio em perfis de sedimento da Baixada Santista, SP

    Energy Technology Data Exchange (ETDEWEB)

    Ramos, Guilherme da Franca

    2010-07-01

    The objective of the present work is to determine the activity concentration of uranium and thorium isotopes and polonium in estuarine sediments from Baixada Santista. The area comprehends nine cities in the Brazilian coast (Bertioga, Guaruja, Santos, Sao Vicente, Cubatao, Praia Grande, Mongagua, Itanhaem and Peruibe). It is one of the most important industrial areas in Brazil due to the large number of industries operating in Cubatao, such as steel, petrochemical and fertilizer industries. That, together with a large population, causes a negative impact on the marine biota. In the present work 10 profiles of sediment cores, with depth varying from 41 to 98 cm, were analyzed. The cores were obtained from Santos, Cubatao, Sao Vicente and Bertioga. The cores were sliced every 2 cm and were treated with both physical and chemical processes, including drying, grinding and sieving. The samples were dissolved by acid digestion, till total dissolution and destruction of organic matter. After the acid digestion, the samples were filtered and evaporated till dryness. The radiochemical techniques used to separate the radionuclides and to prepare the final source for alpha counting were ion exchange chromatography and spontaneous deposition for polonium and electrodeposition for U and Th. The final sources were counted in a surface barrier alpha spectrometer. Values obtained for the radionuclides analyzed were similar to the activity concentrations of sediments in non polluted areas, with the exception of a few samples that showed anthropic influence. (author)

  16. Analysis of the effects of the optimal shut-in point of injector wells on water management strategy; Analise do efeito da determinacao do ponto de fechamento dos pocos injetores na estrategia de gerenciamenro de agua

    Energy Technology Data Exchange (ETDEWEB)

    Mazo, Eduin Orlando Munoz; Barreto, Carlos Eduardo Andrade Gomes; Schiozer, Denis Jose [Centro de Estudos de Petroleo (CEPETRO/UNICAMP), SP (Brazil); Teixeira, Lucas Breda [Universidade Estadual de Campinas (DEP/FEM/UNICAMP), SP (Brazil). Fac. de Engenharia Mecanica. Dept. de Engenharia de Petroleo

    2012-07-01

    The use of water cut as a parameter for determining the shut-in point of production wells is very frequent. However, in most cases, the value of this parameter that is used in the process is not optimized, which can lead to suboptimal performance, as shown in this work. An additional way to improve the water management strategy of the field is set by controlling the injection rate by determining the optimal shut-in point of an injection well, which should be closed when its interaction with the producing wells is negative for their financial performance. To know the interaction between the injector and the producer wells becomes important in order to determine the most appropriate time for the closure of the injector wells. The objective of this study is to illustrate a methodology that allows the optimization of the development and water management strategy of oil fields by using the shut-in control of injection wells, in addition to managing production wells, using numerical reservoir simulation. For this study three case studies are proposed: (1) simulation of a homogeneous and isotropic reservoir model, with the purpose of determining the injection shut-in point by the water cut value obtained from the economic scenario, (2) simulation of the process in simplified cases of heterogeneous reservoirs and (3) application of the methodology to a case of more complex reservoir geology and well configuration in different economic scenarios. The results show that for reservoirs with expected production of large volumes of water and flow high injection rates, the isolated use of water cut for producing wells control as the only procedure to manage the flow of water within the reservoir may be insufficient. Moreover, depending on the price scenario used in economic forecasting and considering cases with heterogeneities, the determination of the shut-in point of injection and producing wells individually can be the most appropriate option for the development and water management strategy of the field. (author)

  17. Determination of trace elements in Mesozoic dykes of the Serra do Mar by neutron activation; Determinacao de elementos tracos em diques mesozoicos da Serra do Mar por meio de ativacao com neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Vicentini, Caio M.; Marques, Leila S., E-mail: caio.vicentini@usp.br, E-mail: leila@iag.usp.br [Universidade de Sao Paulo (IAG/USP), Sao Paulo, SP (Brazil). Instituto de Astronomia, Geofisica e Ciencias Atmosfericas; Figueiredo, Ana Maria G., E-mail: anamaria@ipen.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2013-07-01

    The analysis of trace elements such as rare earths, Th, U, Ta, Hf, Ba, Rb and Ba, is a very important tool for petrogenetic studies. In order to study these processes in dykes of Enxame Serra do Mar (Coast of Sao Paulo and Rio de Janeiro), belonging to the Parana Magmatic Province (PMP), one of the most significant provinces of continental basalts in the world, were perform analyzes by neutron activation in these dikes. The technique, employed in Centro de Reator de Pesquisa of the Instituto de Pesquisas Energeticas e Nucleares, provided concentrations of trace elements with accuracy levels of 10% and 9%, which are suitable for petrogenetic studies. Due to the low concentrations of the elements analyzed, the experimental routine sample preparation processes covered very careful to avoid contamination. The samples investigated can be divided into four groups: basic rocks (SiO{sub 2} <55%) with Ti / Y> 500; basic rocks with Ti / Y <500; intermediate rocks (55% 63%). Dikes of intermediate and acid composition only occur at the Sao Sebastiao Island and adjacent coastal region. The concentrations of major and minor elements, as well as the abundance patterns of rare earths and other incompatible elements of these more differentiated rocks, show significant similarities with the type of the volcanic Chapeco, suggesting similar genesis, in other worlds, including also processes of crustal contamination.

  18. Molecular structure determination of cyclooctane by Ab Initio and electron diffraction methods in the gas phase; Determinacao da estrutura molecular do ciclooctano por metodos Ab Initio e difracao de eletrons na fase gasosa

    Energy Technology Data Exchange (ETDEWEB)

    Almeida, Wagner B. de [Minas Gerais Univ., Belo Horizonte, MG (Brazil). Dept. de Quimica

    2000-10-01

    The determination of the molecular structure of molecules is of fundamental importance in chemistry. X-rays and electron diffraction methods constitute in important tools for the elucidation of the molecular structure of systems in the solid state and gas phase, respectively. The use of quantum mechanical molecular orbital ab initio methods offer an alternative for conformational analysis studies. Comparison between theoretical results and those obtained experimentally in the gas phase can make a significant contribution for an unambiguous determination of the geometrical parameters. In this article the determination for an unambiguous determination of the geometrical parameters. In this article the determination of the molecular structure of the cyclooctane molecule by electron diffraction in the gas phase an initio calculations will be addressed, providing an example of a comparative analysis of theoretical and experimental predictions. (author)

  19. Multicriteria contribution approach for the determination of energy planning politics at new exploratory frontiers of hydrocarbon; Contribuicao da abordagem multicriterio para a determinacao de politicas de planejamento energetico em novas fronteiras exploratorias de hidrocarbonetos

    Energy Technology Data Exchange (ETDEWEB)

    Rocha, Fabio Guimaraes; Bulhoes, Fernando Cesar Chagas [PETROBRAS, Rio de Janeiro, RJ (Brazil)], Emails: fg.rocha@petrobras. com.br, fernando.bulhoes@petrobras.com.br

    2010-07-01

    This paper considers that, given the complexity of the involved factors (environmental, social, technological, economical and financial questions), the multi criteria approach can be viewed as important help tool in the definition of politic related to new hydrocarbon exploratory frontiers. To give subsides to this argument, it was made a bibliographical review, being highlighted the involved risks in exploitation and production activities, and the importance of taking into consideration the preferences of the individuals decision. Methodologies are presented, highlighting the different viewing of the american and french schools. A panorama of random variables involved in decision making of investments in new exploratory frontiers also is presented, emphasizing the importance their importance in the future offer petroleum and the challenges involved in that activity.

  20. Formulation of models for determination of the fuel gas demand and consumption in residential buildings; Formulacao de modelos para determinacao da demanda e consumo de gas combustivel em edificios residenciais

    Energy Technology Data Exchange (ETDEWEB)

    Ilha, Marina Sangoi de Oliveira [Universidade Estadual de Campinas, SP (Brazil). Faculdade de Engenharia Civil. Dept. de Hidraulica e Saneamento; Goncalves, Orestes Marracini [Sao Paulo Univ., SP (Brazil). Escola Politecnica. Dept. de Engenharia de Construcao Civil

    1996-07-01

    This work presents models for design flow rate and gas volume determination in residential buildings. First, an experimental investigation, applied on a sample of residential buildings at Sao Paulo, Brazil, is described, which essentially consisted in the filling of a form and measurement of gas volume at one minute interval during 10 days (mean). From this data, it was performed a regression analysis in order to explain design flow rate (demand) and gas volume values (consumption), based on different variables. Models proposed on this work are different from the current applied methodology due to their 'open' approach, that is, involved variables can be explicitly found in formulas. (author)

  1. Methodology for determination of the operational limits in a atmospheric oven as a function of the load characteristics; Metodologia para determinacao dos limites operacionais de um forno atmosferico em funcao das caracteristicas da carga

    Energy Technology Data Exchange (ETDEWEB)

    Mundstock, Rene [Refinaria Alberto Pasqualini (REFAP), Canoas, RS (Brazil); Correa, Eduardo Coelho [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    2000-07-01

    The necessity of increasing the crude processing with operation periods even greater, are resulting in Atmospheric Distillation Units in severe conditions, requiring even more rigorous operational procedures. The crude fired heaters are the critical equipment in this context, because they are the most susceptible to failures, if some determined limits are exceeded. This work was originated from the tube failure analysis of the fired heater F-101 of Alberto Pasqualini Refinery (REFAP), occurred in july/98, due to internal cocking, with unit emergency shut-down. During this analysis, it was verified that the operational limit of a fired heater cannot be determined only by its design thermal duty, it must be also taken into account the influence of the crude composition. This will determine, due to its film coefficient, the region of the radiation zone of the fired heater where it will begin the crude vaporization and will occur the greater temperatures. The work conclusions resulted on the revision of the Unit operational procedures and definition of new crude processing limits. The fired heater operates with no problems since then. (author)

  2. Preliminary tests to determine the fatigue curve of the Ibis ACSR (Aluminum Cable Steel Reinforced) conductor; Ensaios preliminares para determinacao da curva de fadiga do cabo condutor ACSR Ibis

    Energy Technology Data Exchange (ETDEWEB)

    Rosa, Daniel M. [Universidade de Brasilia (UnB-Gama), DF (Brazil)], E-mail: danielrosa@unb.br; Fadel, Aida A.; Araujo, Jose Alexander; Ferreira, Jorge Luiz A.; Henriques, Antonio Manoel D. [Universidade de Brasilia (EnM/UnB), DF (Brazil). Dept. de Engenharia Mecanica], Emails: aida@unb.br, alex07@unb.br, jorge@unb.br, Henriques@unb.br; Hortencio, Tania M.O.S. [Companhia Energetica de Goias Distribuicao S.A. (CELG D), Goiania, GO (Brazil)], E-mail: tania.hortencio@celg.com.br

    2009-07-01

    The aim of this work was to present a fretting fatigue experimental rig for overhead conductors and to carry out a set of experiments to obtain life estimative for a standard Ibis ACSR, Aluminium Conductor Steel Reinforced. A preliminary S-N (Wohler) Curve was obtained in the medium high cycle fatigue regime. Experiments considered the occurrence of at least two wire breaks to obtain each point of the S-N curve, which was compared to CIGRE's Safe Border Line (CSBL). The experimental results showed five to ten times large lives than the ones provided by CSBL adoption. (author)

  3. Determination of Cl, K, and Na in the blood serum of healthy elderly in the city of Sao Paulo, SP; Determinacao de Cl, K e Na em soro sanguineo de idosos saudaveis da cidade de Sao Paulo

    Energy Technology Data Exchange (ETDEWEB)

    Araujo, Nathalia Souza de; Saiki, Mitiko, E-mail: natsouzaraujo@yahoo.com.b, E-mail: mitiko@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2009-07-01

    This work determined the blood serum concentration of Cl, K, and Na from a healthy elderly population of the city of Sao Paulo, Sao Paulo, Brazil viewing the comparison with reference values used in clinical laboratories. For collecting these samples the present work were approved by the Ethic Committee of the FMUSP and IPEN-CNEN/SP. The quality of the analytical results were evaluated by the analysis of the reference material certification NIST 1577b Bovine Liver. The results presented good accuracy and precision due to the fact that they presented relative errors less than 5.2 % and standard deviation less than 8.6 %. The average concentrations (mmol L{sup -1}) of Cl in the analysed serum were 99.1; the K were 3.9 and the Na were 136.9. The obtained data allows the to conclude that the mostly of the elderly presented Cl, K and Na concentrations in the range of reference values used in the clinical laboratories

  4. Determination of natural radioactivity of groundwater and surface of Brumadinho and Nova Lima, Brazil; Determinacao da radioatividade natural de agua subterranea e superficial de Brumadinho e Nova Lima, Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Faria, Ligia Santana de

    2013-07-01

    The municipalities of Brumadinho and Nova Lima are located in the metropolitan area of Belo Horizonte city. They are of ecological interest since they belong to an Environmental Protection Area, which is located on a very important deposit of iron ore. In addition of mineral wealth, the region has a geological characteristic that includes quartzitic conglomerates associated with uranium and significant potential underground water with hydrogeological characteristics very particular and complex, as the Quartzite Aquifer, which belongs to a geological formation called the 'Moeda Formation'. In the present work radiometric measurements were performed for 44 water samples. The samples were collected in four geographical points, three of them situated in Brumadinho (surface water) and one point situated in Nova Lima municipality (underground water). The period of sampling extended for a thirteen months period. Some of these locations was used as an alternative sampling point. Uranium and thorium concentrations of the samples were determined using an Inductively Coupled Plasma Mass Spectrometer. The content of gross alpha and gross beta activity, and the concentration of the radionuclides {sup 226}Ra, {sup 228}Ra e {sup 210}Pb were determinate by using Spectrometer Liquid Scintillation. In this case was necessary to calibrate the spectrometer using {sup 241}Am e {sup 90}Sr/{sup 90}Y standards. The resultants values were compared with those recommended by the World Health Organization, Ministry of Health and the National Council of the Environment. The maximum level of water natural radioactivity found was 0,275 ± 0,052 Bq.L{sup -1} for gross alpha radiation, 0,130 ± 0,046 Bq.L{sup -1} for {sup 226}Ra and 0,096 ± 0,005 Bq.L-1 for {sup 228}Ra. The levels of gross beta activity and {sup 210}Pb were below the detection limit. The maximum concentrations of uranium and thorium found were 0,068 μg.L{sup -1} and 0.027 μg.L{sup -1} respectively. (author)

  5. Determination of acute toxicity of petroleum refinery effluents in various stages of treatment for Daphnia similis; Determinacao da toxicidade aguda de efluentes de refinaria de petroleo em diversas etapas de tratamento para Daphnia similis

    Energy Technology Data Exchange (ETDEWEB)

    Damato, Murilo; Alem Sobrinho, Pedro; Morita, Dione Mari [Sao Paulo Univ., SP (Brazil). Escola Politecnica. Dept. de Engenharia Hidraulica e Sanitaria]. E-mail: palem@usp.br

    1997-07-01

    The organisms from fresh water are sensible to variations of environmental parameters. The criteria of water quality for these animals are derived from laboratorium tests. The following physical and chemical parameters have been determined: DO, BOD, COD, alkalinity, hardness, ammoniacal nitrogen, sulphides, chlorides, cyanides, oils and greases, aluminium, arsenium, cadmium, chromium, copper, iron, lead, vanadium, zinc, phenols, benzene, toluene, xylene, solids in total suspensions. Acute toxicity tests have been performed on Daphnia similis. The flotation and activated waste systems was efficient in removing acute toxicity.

  6. Determination of the air attenuation and electronic loss for the free air concentric cylinders ionization chamber; Determinacao da atenuacao do ar e perda eletronica para a camara de ionizacao de ar livre de cilindros concentricos

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Hebert Pinto Silveira de

    2010-07-01

    Along the latest years, the LNMRI has been proceeding a continuous research work with a concentric cylinders type free air ionizing chamber (VICTOREEN, model 481), aiming to establish it as a new national standard, and, as a consequence, replace the worldwide accepted secondary standard, calibrated by PTB. Taking into account that the absolute determination of kerma in air with a free air ionizing chamber implies the acquirement of a number of correction factors. The main objective of the present work comprises the determination of the two factors, specifically, electronic loss (k{sub e}) and air attenuation (k{sub a}). The correction factors were obtained through mammography qualities reference spectrum, using Monte Carlo simulation method. The Penelope code was used in the simulation procedures. Simulations took place in two stages, the acquirement of specters related to the qualities of interest (mammography) with the x ray tube (Pantak, model HF160 e Panalytical, model XRF window), and the free-air ionization chamber. The data were compared to those related to the BIPM chamber, to electronic loss were not detected. The comparison between air attenuation factors was obtained data bellow 0.13%. (author)

  7. Determination of thermal diffusivity of dental enamel and dentin as a function of temperature, using infrared thermography; Determinacao da difusividade termica do esmalte e dentina em funcao de temperatura, utilizando termografia no infravermelho

    Energy Technology Data Exchange (ETDEWEB)

    Pereira, Thiago Martini

    2009-07-01

    In this work it was developed a software that calculates automatically, the thermal diffusivity value as a function of temperature in materials. The infrared thermography technique was used for data acquisition of temperature distribution as a function of time. These data were used to adjust a temperature function obtained from the homogeneous heat equation with specific boundary conditions. For that, an infrared camera (detecting from 8 {mu}m to 9 {mu}m) was calibrated to detect temperature ranging from 185 degree C up to 1300 degree C at an acquisition rate of 300 Hz. It was used, 10 samples of dental enamel and 10 samples of dentin, with 4 mm x 4 mm x 2 mm, which were obtained from bovine lower incisor teeth. These samples were irradiated with an Er:Cr:YSGG pulsed laser ({lambda} = 2,78 {mu}m). The resulting temperature was recorded 2 s prior, 10 s during irradiation and continuing for 2 more seconds after it. After each irradiation, all obtained thermal images were processed in the software, creating a file with the data of thermal diffusivity as a function of temperature. Another file with the thermal diffusivity values was also calculated after each laser pulse. The mean result of thermal diffusivity obtained for dental enamel was 0,0084 {+-} 0,001 cm2/s for the temperature interval of 220-550 degree C. The mean value for thermal diffusivity obtained for dentin was 0,0015 0,0004 cm2/s in temperatures up to 360 degree C; however, this value increases for higher temperatures. According to these results, it was possible to conclude that the use of infrared thermography, associated with the software developed in this work, is an efficient method to determine the thermal diffusivity values as a function of temperature in different materials. (author)

  8. Study of calibration equations of {sup 137}Cs methodology for soil erosion determination; Estudo de equacoes de calibracao para metodologia do {sup 137}Cs de determinacao da erosao de solos

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Elias Antunes dos

    2001-02-01

    Using the method of {sup 137} Cs and gamma-ray spectrometry, soil samples of two plots erosion were studied at Londrina city. the soil class studied was a dystrophic dark red soil (LRd), with erosion indexes measured by Agronomic Institute of Parana State (IAPAR) using a conventional method, since 1976. Through the percentage reduction of {sup 137} Cs related to the reference site, the soil losses were calculated using the proportional, mass balance and profile distribution models. Making the correlation between the {sup 137} Cs concentrations and the erosion measured by IAPAR, two calibration equations were obtained and applied to the data set measured in the basin of the Unda river and compared to those models in the literature. As reference region, was chosen a natural forest located close to the plots. The average inventory of {sup 137} Cs was 555{+-} 16 Bq.m{sup -2}. The inventories of the erosion plots varied from 112 to 136 Bq.m{sup -2} for samples collected until 30 cm depth. The erosion rates estimated by the models varied from 64 to 85 ton.ha{sup -1}.yr{sup -1} for the proportional and profile distribution models, respectively, and 137 to 165 ton.ha{sup -1} for the mass balance model, while the measured erosion obtained by IAPAR was 86 ton.ha{sup -1}.yr{sup -1}. From the two calibration equations obtained, the one that take into account the {sup 137} Cs distribution with the soil profile was that showed the best consistence with the erosion rated for the basin of the Unda river (same soil class) in the range from 4 to 48 ton.ha{sup -1}.yr{sup -1}, while the proportional and profile distribution models applied rates from 7 to 45 ton.ha{sup -1}.yr{sup -1} and 6 to 69 ton.ha{sup -1}.yr{sup -1}, respectively. (author)

  9. Procedure for determination of the decontamination of piping in the production of iodine-125 seeds; Procedimento para determinacao da descontaminacao de tubulacoes, na producao de sementes de iodo-125

    Energy Technology Data Exchange (ETDEWEB)

    Moura, J.A.; Moura, E.S.; Sprenger, F.E.; Nagatomi, H.R.; Zeituni, C.A.; Feher, A.; Manzoli, J.E.; Souza, C.D.; Rostelato, M.E.C.M., E-mail: elisaros@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2009-07-01

    Iodine-125 seeds are radioactive sources used in the prostate cancer treatment. This work objective was to determine the necessary conditions and procedures for decontamination of liquid transfer tubes when a radioactive material leakage occurs during the process of seed quality control

  10. Efeitos da associação entre pequenas doses subaracnóideas de morfina e cetoprofeno venoso e oral em pacientes submetidas à cesariana Efectos de la asociación entre pequeñas dosis subaracnóideas de morfina y cetoprofeno venoso y oral en pacientes sometidas a cesariana Effects of low spinal morphine doses associated to intravenous and oral ketoprofen in patients submitted to cesarean sections

    Directory of Open Access Journals (Sweden)

    Eliana Marisa Ganem

    2003-08-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Pequenas doses subaracnóideas de morfina são eficazes em reduzir a dor pós-operatória de pacientes submetidas à cesariana, com menor incidência de efeitos colaterais. O objetivo desta pesquisa foi avaliar a qualidade da analgesia pós-operatória e a ocorrência de efeitos colaterais em pacientes submetidas a cesarianas, sob anestesia subaracnóidea com bupivacaína hiperbárica e morfina nas doses de 0,05 mg e 0,1 mg, associadas ao cetoprofeno pelas vias venosa e oral. MÉTODO: Participaram do estudo 60 gestantes de termo, estado físico ASA I e II, que foram submetidas à cesariana eletiva. As pacientes foram divididas em dois grupos: grupo 1 - morfina 0,1 mg, grupo 2 - 0,05 mg, associada a 15 mg de bupivacaína hiperbárica. Todas receberam cetoprofeno (100 mg por via venosa no per-operatório e por via oral a cada 8 horas no primeiro dia de pós-operatório. As pacientes foram avaliadas 6, 12 e 24 horas após o término da cirurgia, com relação à intensidade da dor e presença de efeitos colaterais (sedação, prurido, náusea e vômito. A presença destes últimos também foi avaliada no per-operatório. RESULTADOS: Ambos os grupos foram idênticos quanto aos dados antropométricos e à duração da cirurgia e da anestesia. Também foram homogêneos com relação à intensidade da dor pós-operatória e à presença de prurido, sedação, náusea e vômito. CONCLUSÕES: A morfina, nas doses de 0,05 mg e 0,1 mg administradas no espaço subaracnóideo, associada ao cetoprofeno pelas vias venosa e oral, apresentou a mesma qualidade de analgesia pós-operatória e determinou a mesma ocorrência de efeitos colaterais.JUSTIFICATIVA Y OBJETIVOS: Pequeñas dosis subaracnóideas de morfina son eficaces en reducir el dolor pos-operatorio de pacientes sometidas a cesariana, con menor incidencia de efectos colaterales. El objetivo de esta pesquisa fue evaluar la calidad de la analgesia pos-operatoria y la ocurrencia

  11. Evaluation of rate of unstable chromosomal changes in human blood irradiated by X-rays: establishment of dose-response curve; Avaliação da taxa de alterações cromossômicas instáveis em sangue humano irradiado por Raios x: estabelecimento de curva dose-resposta

    Energy Technology Data Exchange (ETDEWEB)

    Mendonça, J.C.G.; Mendes, M.E.; Melo, A.M.M.A., E-mail: july_cgm@yahoo.com.br [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil); Silva, L.M.; Andrade, A.M.G.; Hwang, S.F.; Lima, F.F. [Centro Regional de Ciências Nucleares do Nordeste (CRCN-NE/CNEN-PE), Recife, PE (Brazil). Lab. de Dosimetria Biológica

    2017-07-01

    Since the discovery of ionizing radiation, and consequently of its properties, there has been an increasing in its use, which in turn has raised concerns about the biological damage that it could cause in exposed individuals. As a result, cytogenetic dosimetry has emerged: a method that can be used as a complement or, in the absence of physical dosimetry, relating the frequency of chromosomal changes found in the blood of the exposed individual and the dose absorbed through dose-response calibration curves. This work aimed to verify the frequencies of the unstable chromosomal changes in human blood lymphocytes irradiated by X-rays of 250 kVp with different absorbed doses and later establish the dose-response calibration curves. The irradiation was performed at the CRCN-NE/CNEN-PE, Brazil metrology service on a PANTAK X-ray machine, model HF 320. The blood samples had their lymphocytes cultured in culture media and, after the processing, the metaphases were obtained. The chromosomal alterations analyzed were chromosomes dicentric, ring and isolated actinic fragments. There was an increase in frequencies of all chromosomal changes with increased absorbed dose. The calibration curves of dicentric and dicentric + rings presented good adjustments with the values of the coefficients Y = 0.0013 + 0.0271D + 0.0556D{sup 2} (X{sup 2} = 10.36 / GL = 6) and Y = 0.0013 + 0.0263D + 0.0640D{sup 2} (X{sup 2} = 7.43 / GL = 6), respectively. The establishment of these curves enables the Laboratory of Biological Dosimetry of the CRCN/NE/CNEN-PE to estimate the dose absorbed by occupationally exposed individuals and in cases of radiological accidents.

  12. Comparison between dose calculation in XiO Registered-Sign and dosimetric measurements in virtual wedge photon beams; Comparacao entre o calculo da dose no XiO Registered-Sign e medidas dosimetricas em feixes de fotons com filtro virtual

    Energy Technology Data Exchange (ETDEWEB)

    Almeida, Laila G.; Amaral, Leonardo L.; Oliveira, Harley F., E-mail: lailagalmeida@gmail.com [Universidade de Sao Paulo (HCFMRP/USP), Ribeirao Preto, SP (Brazil). Hospital das Clinicas. Servico de Radioterapia; Maia, Ana F. [Universidade Federal de Sergipe (UFS), Sao Cristovao (Sweden), (Brasil) Departamento de Fisica

    2012-08-15

    The virtual wedge is useful tool in the radiation treatment planning since it has series of advantages over the hard wedge. Quality control tests ensure correct performance of the planning done in treatment planning systems (TPS). This study aimed to compare doses calculated by TPS and doses measured by ionization chamber (CI) and an ionization chambers array in virtual wedge photon beams of 6 MV. Measures carried out in Primus linear accelerator with a solid water phantom and dosimeter positioned at 10 cm depth with gantry at 0 Degree-Sign in many fields sizes and angles in the virtual wedge. Measurements on the central axis used as dosimeter an IC and on off-axis used an IC array. The simulation in CMS-XiO used the CT images of the phantom in the same configuration of the irradiation. Maximum and minimum values of the percentage differences between the doses provided by TPS and measurements with ionization chamber on the central axis were 1.43 and -0.10%, respectively, with average percentage difference of 0.08% and confidence limit of {Delta}=1.72%. In the region off-axis, the average percentage difference was 0.04%, with a maximum of 1.9%, minimum of 0% and confidence limit of {Delta}=1.91%. All values for dose percentage differences were below 2% and lower confidence limit of 3% are thus, according to the recommendations of the Technical Report Series - TRS-430. (author)

  13. Study of the radiation scattered and produced by concrete shielding of radiotherapy rooms and its effects on equivalent doses in patients' organs; Estudo da radiacao espalhada e produzida pela blindagem de concreto de salas de radioterapia e seus efeitos sobre doses equivalentes nos orgaos dos pacientes

    Energy Technology Data Exchange (ETDEWEB)

    Braga, K.L.; Rebello, W.F.; Andrade, E.R.; Gavazza, S.; Medeiros, M.P.C.; Mendes, R.M.S.; Gomes, R.G.; Silva, M.G., E-mail: kelmo.lins@gmail.com, E-mail: rebello@ime.eb.br, E-mail: fisica.dna@gmail.com, E-mail: sergiogavazza@yahoo.com, E-mail: eng.cavaliere@gmail.com, E-mail: raphaelmsm@gmail.com, E-mail: ggrprojetos@gmail.com, E-mail: maglosilva15@gmail.com [Instituto Militar de Engenharia (IME), Rio de Janeiro, RJ (Brazil). Secao de Engenharia Nuclear; Thalhofer, J.L.; Silva, A.X., E-mail: jardellt@yahoo.com.br, E-mail: ademir@con.ufrj.br [Coordenacao dos Programas de Pos-Graduacao em Engenharia (COPPE/UFRJ), Rio de Janeiro, RJ (Brazil). Programa de Energia Nuclear; Santos, R.F.G., E-mail: raphaelfgsantos@gmail.com [Centro Universitario Anhanguera, Niteroi, RJ (Brazil). Departamento de Engenharia

    2015-07-01

    Within a radiotherapy room, in addition to the primary beam, there is also secondary radiation due to the leakage of the accelerator head and the radiation scattering from room objects, patient and even the room's shielding itself, which is projected to protect external individuals disregarding its effects on the patient. This work aims to study the effect of concrete shielding wall over the patient, taking into account its contribution on equivalent doses. The MCNPX code was used to model the linear accelerator Varian 2100/2300 C/D operating at 18MeV, with MAX phantom representing the patient undergoing radiotherapy treatment for prostate cancer following Brazilian Institute of Cancer four-fields radiation application protocol (0°, 90°, 180° and 270°). Firstly, the treatment was patterned within a standard radiotherapy room, calculating the equivalent doses on patient's organs individually. In a second step, this treatment was modeled withdrawing the walls, floor and ceiling from the radiotherapy room, and then the equivalent doses calculated again. Comparing these results, it was found that the concrete has an average shielding contribution of around 20% in the equivalent dose on the patient's organs. (author)

  14. Quantitative model of evaluation of the contribution of each radioactive source in the individual external dose Hx in nuclear medicine service personnel; Modelo quantitativo de avaliacao da contribuicao de cada fonte radioativa na dose individual externa Hx em trabalhador de servico de medicina nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Nathalie Canhameiro; Tinois, Eduardo; Koga, Katia Hiromoto; Bezerra, Aline da Silva; Ferreira, Vinicius Capistrano; Azevedo, Thaisa Resende; Moriguchi, Sonia Marta, E-mail: soniamoriguchi@fmb.unesp.br [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Botucatu, SP (Brazil). Faculdade de Medicina. Hospital das Clinicas

    2016-07-01

    Assess whether the activities performed in the Nuclear Medicine service are significant in the total dose received by the workers and their relative contributions. Methods: measured independent variables: number of scintigraphies remaining in the examination room (N); eluted activity (E); Total activity marked in pharmaceuticals kits (K); num-ber of times that was scheduled to work in the Hot room (Q); Variable dependent measured: cumulative effective dose in the period 10/2012 to 04/2013 added to each worker, obtained by information registered daily and monthly on activities and doses received in the period. Held Multiple Linear Regression (D = a + β{sub 1} N + E + β{sub 2} β{sub 3} K + β{sub 4} Q) with α = 0.05 significance level. It was concluded that the independent variables N (p = 0.097) and E (p = 0.086) did not significantly interfere with the Cumulative dose in the period. The K variables (p = 0.017) and Q (p = 0.028) were significant in the proposed model. (author)

  15. Study of distribution of doses in maintenance operations and interventions in restricted areas of IPEN's radiopharmacy center, Brazil; Estudo da distribuicao de doses em operacoes de manutencao e intervencao em areas restritas no Centro de Radiofarmacia do IPEN

    Energy Technology Data Exchange (ETDEWEB)

    Machado, Jessica S.; Souza, Daiane C.; Rodrigues Junior, Orlando; Gerulis, Eduardo; Todo, Alberto S., E-mail: jsmachado@ipen.br, E-mail: dcsouza@ipen.br, E-mail: rodrijr@ipen.br, E-mail: egerulis@ipen.br, E-mail: astodo@ipen.br [Instituto de Pesquisas Energeticas e Nucleares (lPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2013-07-01

    This research was developed at the Radiopharmacy Center of the Nuclear and Energy Research Institute - IPEN/CNEN/SP, Brazil, that performs the production of radiopharmaceuticals with isotopes of the {sup 131}I, {sup 123}I, {sup 201}Tl, {sup 67}Ga, {sup 18}F and {sup 99}Mo for use in nuclear medicine. The radioisotopes are produced on an industrial scale and the installation was designed to meet radiation safety standards and quality control requirements. To ensure the production, there are skilled professionals who perform the tasks of maintenance of the equipment and instruments, installed in the cells of processing of radiopharmaceuticals, without which it is not possible to conduct the work with safety and quality. This study was done a survey called Survey of Variables, based on the maintenance operations and interventions in restricted areas of the Centre of Radiopharmacy and in the survey of the distribution of doses in these tasks, carried out during the period from 2005 to 2011. This research aims to identify and determine the main variables that have an impact on the worker's dose. The results are presented for the Occupationally Exposed Individual variable, variable operation, variable area/Cell, task and Feature variable and variable duration of operation, depending on the Dose variable. It is intended in this way to contribute to improvements in operations in restricted areas that may result in lower individual doses without causing significant changes in the routine of work.

  16. Determination of volatiles produced during radiation processing in food and medicinal herbs; Determinacao de volateis produzidos durante o processamento por radiacao em ervas alimenticias e medicinais

    Energy Technology Data Exchange (ETDEWEB)

    Salum, Debora Christina

    2008-07-01

    In order to protect food from pathogenic microorganisms as well as to increase its shelf life while keeping sensorial properties (e.g. odor and taste), once the latter are one of the main properties required by spice buyers, it is necessary to analyze volatile formation from irradiation of medicinal and food herbs. The aim of the present study was to analyze volatile formation from Co irradiation of Laurus Cinnamomum, Piper Nigrum, Origanum Vulgare and Myristica Fragans. Possible changes on the odor of these herbs are evaluated by characterizing different radiation doses and effects on sensorial properties in order to allow better application of irradiation technology. l he samples have been irradiated in plastic packages by making use of a {sup 60}Co Gamma irradiator. Irradiation doses of 0, 5, 10, 15, 20 and 25kGy have been tested. For the analysis of the samples, SPME has been applied, while for the analysis of volatile compounds, CG/MS. Spice irradiation has promoted mostly decrease in volatile compounds when doses of 5, 10, 15, 20 and 25kGy were used. For Laurus cinnamomum, the irradiation decreased volatile by nearly 56% and 89.5% respectively, comparing to volatile from a sample which has not been previously irradiated. Differently from other spices analyzed, irradiation on Myristica Fragans has increased volatile compounds except for 4-terpineol. The miristicine (toxic substance when in large quantities, commonly mentioned as narcotic) has increased by nearly 80%. For Origanum Vulgare and Piper Nigrum, significant decrease in volatile compounds have been found, mainly when it comes to 25 kGy irradiation. In general, results indicate loss of sensorial quality of spices. (author)

  17. Use of low doses of cobalt 60 gamma radiation on beet (Beta vulgaris L.), carrot (Daucus carota L.) and radish (Raphanus sativus L.) seed to stimulate increase yield; Emprego da radiacao gama do cobalto 60 em sementes de beterraba (Beta vulgaris L.), cenoura (Daucus carota L.) e rabanete (Raphanus sativus L.) para estimular o aumento da producao

    Energy Technology Data Exchange (ETDEWEB)

    Bovi, Jose Eduardo

    2000-07-01

    The research had the aim of evaluating the effects of low doses of Cobalt-60 gamma radiation on seeds of radish (Raphanus sativus L.) cultiva Champion, cultivars Nantes Forto (european origin) and Brasilia (Rio Grande do Sul origin) carrot (Daucus carota L. var. sativus (Hoffm.) Thell), and red beet (Beta vulgaris L.) cultivar Tall Top Early Wonder before sowing, its effects on plant growth, on the yield and roots storage of two tillages: with sowing in the same day of radiation and six days after radiation seeds. The data showed that the seeds radiation did not interfered negatively on plants growth, and the species presented differences as roots production and doses on both plantation: radish with 5,0 Gy and 2,5 Gy doses respectively to the first and the second sowings, Brasilia carrot with 2,5 Gy dose to both sowings. Nantes carrot with 2,5 Gy and 5,0 Gy respectively to the first and the second sowings, and beet with 7,5 Gy and 5,0 Gy respectively to the first and the second plantations. There is not statistics difference by Tukey test (5% and 1%) and none relation between seeds radiation and loss weight on roots storage. (author)

  18. Crescimento, trocas gasosas e potencial osmótico da bananeira-'Prata', submetida a diferentes doses de sódio e cálcio em solução nutritiva Growth, gaseous exchange and osmotic potential of banana 'Prata' plants, exposed to different concentrations of sodium and calcium in nutritive solution

    Directory of Open Access Journals (Sweden)

    LUDMILA LAFETÁ DE MELO NEVES

    2002-08-01

    Full Text Available O cálcio vem sendo utilizado com o intuito de incrementar tolerância a sais nas plantas, pois sabe-se que a salinidade restringe o crescimento e a produtividade de muitas culturas. Este estudo teve por objetivo avaliar os efeitos da aplicação de sódio e cálcio sobre o crescimento inicial, trocas gasosas e potencial osmótico da bananeira (Musa spp. 'Prata' (AAB. Foi utilizado o delineamento experimental em blocos casualizados, com arranjo fatorial 4 x 4 [ 4 doses de sódio ( 0; 5; 10; 15 mmol L-1 e 4 de cálcio ( 2; 4; 8; 12 mmol L-1] e 3 repetições. A emissão total de folhas e o potencial osmótico das plantas não foram influenciados pelos tratamentos. O aumento dos níveis de sódio na solução promoveu redução significativa na massa fresca da parte aérea, altura, área foliar, diâmetro do pseudocaule e massa seca das plantas. A presença de 5 mmol L-1 de Na na solução favoreceu as trocas gasosas. O aumento dos níveis de cálcio na solução promoveu a redução da massa fresca da parte aérea, altura e área foliar da bananeira-'Prata'.The Calcium has been used to increase salt tolerance in plants since salinity restricts growth and productivity in many crops. This study was conducted with the objective of evaluating the effects of sodium and calcium application on the initial growth, gaseous exchange and osmotic potential of banana (Musa spp. 'Prata' plants (AAB. The experimental layout was a 4 x 4 factorial with three replicates in a randomized complete block design. The factors tested were concentrations of sodium (0; 5; 10; 15 mmol L-1 and calcium (2; 4; 8; 12 mmol L-1. The total emition of leaves and the osmotic potential of the plants were not influenced by the treatments. However, the increase in concentrations of sodium in the nutritive solution resulted in significant reduction of the fresh weight of aerial plant parts, height and leaf area of the plants, diameter of the pseudostem, and dry weight of the plants. The

  19. Alteration in the absorption cell dose arising from the use of gold nanoparticle associated with the radionuclides of clinical application: simulate study; Alteracao na absorcao de dose celular decorrente da utilizacao de nanoparticulas de ouro associadas a radionuclideos de aplicacao clinica: estudo simulado

    Energy Technology Data Exchange (ETDEWEB)

    Culik, Lucas; Schwarcke, Marcelo, E-mail: mschwarcke@unifra.br [Centro Universitario Franciscano (UNIFRA), Santa Maria, RS (Brazil)

    2015-12-15

    The present work is a proposal to assess, which is the efficiency in the use of radionuclides of clinical application in nuclear medicine service conjugated system with gold nanoparticles.To obtain the results needed for the interpretation of this combination, was using the Monte Carlo simulation code PENELOPE, where was the main structures of a simulated eukaryote cell. To simulate irradiation on cellular structures was used the emission spectrum of main radionuclide clinical use in nuclear medicine service. The material containing gold nanoparticles was modeled according the stoichiometric proportions found in the literature. The results obtained, present for the simulated energies to smaller bodies than 2,0μm, no substantial response to the use of nanoparticles in the reinforcement of locally absorbed dose. Is observed a small decrease in locally dose absorbed due to emission of charged particles, it is believed that causes an increase in the emission secondary range to be placed outside the study body. But this effect is small when comparing to the increase of energy absorbed due to interaction with the bodies containing nanoparticles, so demonstrating an increase in the locally dose absorbed. Being observed that there is an increase in dose absorbed locally due to the use of nanoparticles. For protocols based on the principle of target radionuclide therapy, the imaging of the treaty sit will be affected in their statistical accuracy, since the gamma radiation will be attenuated by the nanoparticles present in the material. Being necessary to know if this increase in the locally absorbed dose has greater importance in the treatment protocol than the image of the absorption of the radioactive material in the target organ. (author)

  20. POTASSIUM FERTILIZATION OF SOYBEAN, PEARL MILLET, AND COTTON IN A NO-TILL ROTATION SYSTEM IN THE CERRADO REGION DOSES E FORMAS DE APLICAÇÃO DA ADUBAÇÃO POTÁSSICA NA ROTAÇÃO SOJA, MILHETO E ALGODÃO EM SISTEMA PLANTIO DIRETO

    Directory of Open Access Journals (Sweden)

    Maria da Conceição Santana Carvalho

    2009-03-01

    -style: normal; line-height: 120%; text-decoration: none;" lang="pt-BR" align="justify"> 

    KEY-WORDS: Glycine max; Pennisetum; Gossypium hirsutum; fiber quality; agronomic efficiency.

    Este estudo teve como objetivo avaliar a eficiência da adubação potássica, com relação às doses, modos (sulco, a lanço e parcelada e épocas de aplicação (pré-semeadura, semeadura e cobertura, na sucessão de culturas soja-milheto-algodoeiro, cultivadas em sistema plantio direto, em Latossolo Vermelho, no município de Turvelândia, Goiás (17o51’S, 50o18’W. O delineamento experimental adotado foi o de blocos casualizados, com quatro repetições, em esquema fatorial. A fonte de potássio utilizada nas adubações foi o cloreto de potássio. Na soja, os tratamentos utilizados foram doses de K2O (0 kg ha-1, 30 kg ha-1, 60 kg ha-1 e 180 kg ha-1, aplicadas em pré-semeadura (a lanço e na semeadura (no sulco, com e sem cobertura. Na cultura do algodoeiro, os tratamentos foram doses de K2O (0 kg ha-1, 60 kg ha-1, 120 kg ha-1 e 240 kg ha-1, aplicadas em pré-semeadura (a lanço e na semeadura (no sulco, com 0, 1 ou 2 coberturas. A adubação em pré-semeadura foi realizada no milheto. Não houve efeito da adubação potássica sobre a

  1. Determination of the Antarctic region active margin basement by using integration of the information coming from the multichannel seismic analysis and the magnetometry; Determinacao do embasamento da margen ativa da regiao Antartica pela integracao de informacoes provenientes da sismica multicanal e da magnetometria

    Energy Technology Data Exchange (ETDEWEB)

    Torres, Luiz Carlos [Diretoria de Hidrografia e Navegacao, XX (Brazil); Gomes, Benedito Souza [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil); Gamboa, Luiz Antonio P. [Universidade Federal Fluminense, Niteroi, RJ (Brazil)

    1999-07-01

    Geophysical measurements were carried out in the Western Margin of the Antarctic Peninsula and Bransfield Strait by the Brazilian Antarctic Program during the summers of 1987 and 1988. The present work, using a continued seismic multi channel and magnetometry data profile crossing the area, intends to present a two-dimensional model of the interface sediment/basement and contribute to the understanding of the complex geology verified in the studying area. By this model, the main provinces of the are (Deep Ocean, South Shetland Trench, Accretionary Prism, Volcanic Arc South Shetland Islands and Bransfield Basin) could be determined. The seismic and magnetic measurements information when superposed can attribute more consistencies to the interpreted basement; although each method has its particular resolution. This way, when the seismic interpretation was not possible due to complex structures disposition, magnetic measurements could offer good estimation about basement depth. The fit between both methods (seismic and magnetic measurements) was reasonable both on the oceanic basin and in the region of Bransfield Strait. The magnetometry, as as well seismic, was sensible to the dip of Drake Plate at South Shetland Trench and the Intrusive occurrence at Bransfield Basin axis. (author)

  2. FERMENTATION AND AEROBIC LOSSES IN CORN GRAIN ENSILED WITH Lactobacillus buchneri “NCIMB 40788” EFEITO DE DOSES DE Lactobacillus buchneri “CEPA NCIMB 40788” SOBRE AS PERDAS NOS PERÍODOS DE FERMENTAÇÃO E PÓS-ABERTURA DA SILAGEM DE GRÃOS ÚMIDOS DE MILHO

    Directory of Open Access Journals (Sweden)

    Estella Rosseto Janusckiewicz

    2008-12-01

    , durante a exposição aeróbia, as silagens inoculadas com doses a partir de 1x105 UFC/g de massa ensilada mostraram-se mais estáveis, aumentando de 68 h (controle para 239,3 h (dose de 1x105 UFC/g de massa ensilada o tempo de quebra da estabilidade. A inoculação da silagem de grão úmido de milho com dose de L. buchneri de 1 x 105 UFC/g de massa ensilada mostrou-se eficaz no controle de leveduras e fungos e promoveu aumento na estabilidade aeróbia. Doses superiores às supracitadas possuem efeito benéfico, no entanto tem-se de considerar a relação custo–benefício.

    PALAVRAS-CHAVES: Aditivos, ensilagem, estabilidade, fermentação, perdas.

  3. Evaluation of quality characteristics and functional properties of mechanically deboned chicken meats treated with different dose rates of ionizing radiation and use of antioxidants; Avaliacao de caracteristicas de qualidade e propriedades funcionais da carne mecanicamente separada de frango tratada com diferentes taxas de dose de radiacao ionizante e uso de antioxidantes

    Energy Technology Data Exchange (ETDEWEB)

    Brito, Poliana de Paula

    2012-07-01

    The Mechanically Deboned chicken meat (MDCM) is used in traditional meat products, in greater proportion in those emulsified, replacing meat raw materials more expensive. The raw material can have high MDCM the microbial load, as a result of contamination during processing or failure during the evisceration. The irradiation process is accepted as one of the most effective technologies when compared to conventional techniques of preservation, to reduce contamination of pathogens and spoilage. However, little information is available about the use and effects of different dose rates of ionizing radiation processing. Irradiation causes chemical changes in food, a major cause of deterioration of quality of raw or cooked meat products during refrigerated storage, frozen. The objective of this study was to evaluate the effects of different dose rates of ionizing radiation on the production of Thiobarbituric Acid Reactive Substances (TBARS), color, microbiological and sensory characteristics of mechanically deboned chicken added or without added antioxidants, during the cold storage and evaluation of functional properties. The results showed that among the tested dose rates using cobalt-60 source, dose rate of 4.04 kGy.h-1 was the best for processing MDCM. Furthermore, the use of the combination of rosemary antioxidant and α-tocopherol were able to reduce lipid oxidation generated by irradiation of the samples, showed a synergistic effect to the processing with ionizing radiation in reduction of psychrotrophic bacteria count and contributed to a better sensory quality. The use of radiation in the processing FDMI did not adversely affect the functional properties studied. (author)

  4. Development of a external exposure computational model for studying of input dose in skin for radiographs of thorax and vertebral column; Desenvolvimento de um modelo computacional de exposicao externa para estudo da dose de entrada na pele para radiografias de torax e coluna

    Energy Technology Data Exchange (ETDEWEB)

    Muniz, Bianca C.; Menezes, Claudio J.M., E-mail: bianca.cm95@gmail.com, E-mail: cjmm@cnen.gov.br [Centro Regional de Ciencias Nucleares do Nordeste (CRCN-NE/CNEN-PE), Recife, PE (Brazil); Vieira, Jose W., E-mail: jwvieira@br.inter.net [Instituto Federal de Educacao, Ciencia e Tecnologia de Pernambuco (IFPE), Recife, PE (Brazil)

    2014-07-01

    The dosimetric measurements do not always happen directly in the human body. Therefore, these assessments can be performed using anthropomorphic models (phantoms) evidencing models computational exposure (MCE) using techniques of Monte Carlo Method for virtual simulations. These processing techniques coupled with more powerful and affordable computers make the Monte Carlo method one of the tools most used worldwide in radiation transport area. In this work, the Monte Carlo EGS4 program was used to develop a computer model of external exposure to study the entrance skin dose for chest and column X-radiography and, aiming to optimize these practices by reducing doses to patients, professionals involved and the general public. The results obtained experimentally with the electrometer Radcal, model 9015, associated with the ionization chamber for radiology model 10X5-6, showed that the proposed computational model can be used in quality assurance programs in radiodiagnostic, evaluating the entrance skin dose when varying parameters of the radiation beam such as kilo voltage peak (kVp), current-time product (mAs), total filtration and distance surface source (DFS), optimizing the practices in radiodiagnostic and meeting the current regulation.

  5. Use of Monte Carlo Methods for determination of isodose curves in brachytherapy; Uso de tecnicas Monte Carlo para determinacao de curvas de isodose em braquiterapia

    Energy Technology Data Exchange (ETDEWEB)

    Vieira, Jose Wilson

    2001-08-01

    Brachytherapy is a special form of cancer treatment in which the radioactive source is very close to or inside the tumor with the objective of causing the necrosis of the cancerous tissue. The intensity of cell response to the radiation varies according to the tissue type and degree of differentiation. Since the malign cells are less differentiated than the normal ones, they are more sensitive to the radiation. This is the basis for radiotherapy techniques. Institutes that work with the application of high dose rates use sophisticated computer programs to calculate the necessary dose to achieve the necrosis of the tumor and the same time, minimizing the irradiation of tissues and organs of the neighborhood. With knowledge the characteristics of the source and the tumor, it is possible to trace isodose curves with the necessary information for planning the brachytherapy in patients. The objective of this work is, using Monte Carlo techniques, to develop a computer program - the ISODOSE - which allows to determine isodose curves in turn of linear radioactive sources used in brachytherapy. The development of ISODOSE is important because the available commercial programs, in general, are very expensive and practically inaccessible to small clinics. The use of Monte Carlo techniques is viable because they avoid problems inherent to analytic solutions as, for instance , the integration of functions with singularities in its domain. The results of ISODOSE were compared with similar data found in the literature and also with those obtained at the institutes of radiotherapy of the 'Hospital do Cancer do Recife' and of the 'Hospital Portugues do Recife'. ISODOSE presented good performance, mainly, due to the Monte Carlo techniques, that allowed a quite detailed drawing of the isodose curves in turn of linear sources. (author)

  6. Use of Monte Carlo Methods for determination of isodose curves in brachytherapy; Uso de tecnicas Monte Carlo para determinacao de curvas de isodose em braquiterapia

    Energy Technology Data Exchange (ETDEWEB)

    Vieira, Jose Wilson

    2001-08-01

    Brachytherapy is a special form of cancer treatment in which the radioactive source is very close to or inside the tumor with the objective of causing the necrosis of the cancerous tissue. The intensity of cell response to the radiation varies according to the tissue type and degree of differentiation. Since the malign cells are less differentiated than the normal ones, they are more sensitive to the radiation. This is the basis for radiotherapy techniques. Institutes that work with the application of high dose rates use sophisticated computer programs to calculate the necessary dose to achieve the necrosis of the tumor and the same time, minimizing the irradiation of tissues and organs of the neighborhood. With knowledge the characteristics of the source and the tumor, it is possible to trace isodose curves with the necessary information for planning the brachytherapy in patients. The objective of this work is, using Monte Carlo techniques, to develop a computer program - the ISODOSE - which allows to determine isodose curves in turn of linear radioactive sources used in brachytherapy. The development of ISODOSE is important because the available commercial programs, in general, are very expensive and practically inaccessible to small clinics. The use of Monte Carlo techniques is viable because they avoid problems inherent to analytic solutions as, for instance , the integration of functions with singularities in its domain. The results of ISODOSE were compared with similar data found in the literature and also with those obtained at the institutes of radiotherapy of the 'Hospital do Cancer do Recife' and of the 'Hospital Portugues do Recife'. ISODOSE presented good performance, mainly, due to the Monte Carlo techniques, that allowed a quite detailed drawing of the isodose curves in turn of linear sources. (author)

  7. Efeitos de métodos de estabelecimento de braquiária e estilosantes e de doses de calcário, fósforo e gesso sobre alguns componentes nutricionais da forragem Effect of establishment methods of brachiaria and stylosanthes, limestone, gypsum and phosphorus on some forage nutritional components

    Directory of Open Access Journals (Sweden)

    Eduardo Eustáquio Mesquita

    2002-11-01

    Full Text Available Um experimento foi conduzido com o objetivo de avaliar, em dois anos, os efeitos de métodos de estabelecimento (sulcamento: 1,5 e 1,0 m entre linhas em etapa única; 1,5 e 1,0 m em duas e três etapas, respectivamente; aração, gradeação e sulcos espaçados de 1,0 m entre linhas, doses de calcário (25, 50, 75 e 100% da necessidade de calagem-NC, obtida pelo método do Al, Ca e Mg trocáveis, gesso agrícola (0, 230, 940, 1.880 e 2.820 kg/ha, referentes à substituição de 0, 3,0, 12,5, 25,0 e 37,5% do CaO do calcário pelo CaO do gesso, na dose de 100% da NC e P2O5 (50, 100, 150, 200 e 250 kg/ha nas concentrações de minerais (P, K, Ca, Mg e S, proteína bruta (PB, fibra em detergente neutro (FDN, fibra em detergente ácido (FDA e lignina na matéria seca e na DIVMS de Brachiaria decumbens consorciada com Stylosanthes guianensis cv. Mineirão. Os métodos de estabelecimento em duas e três etapas propiciaram maiores concentrações de K na braquiária e Ca no estilosantes. As maiores concentrações de PB na braquiária foram alcançadas com o estabelecimento com aração e gradeação do solo. A substituição do calcário pelo gesso elevou as concentrações de S, Ca e PB na matéria seca da braquiária e do estilosantes e reduziu as concentrações de FDN na gramínea. As doses de P elevaram as concentrações de P, PB e a DIVMS e reduziram as concentrações de FDN na braquiária, melhorando seu valor nutritivo.A field trial was carried out to evaluate the establishment methods (Furrow only: row 1,5 and 1,0 m apart at one time; 1.5 and 1.0 at two and three times, respectively; Plowing and horrowing: row 1,0 apart, limestone (25, 50, 75 e 100% of necessity of limestone, obtained by Al, Ca e Mg exchangeable, gypsum (0, 230, 940, 1.880 e 2.820 kg/ha and P2O5 (50, 100, 150, 200 e 250 kg/ha on minerals concentration (P, K, Ca, Mg e S; crude protein (CP, neutral detergent fiber (NDF, acid detergent acid (ADF and in vitro dry matter

  8. Quantificação de macronutrientes no solo e em folhas de cana-de-açúcar em função de doses de resíduo da mineração de bauxita Nutrient diagnosis of sugarcane in function of residue rates of the bauxite mining

    Directory of Open Access Journals (Sweden)

    Fabio O. De Nobile

    2010-02-01

    Full Text Available O experimento foi realizado em ambiente protegido, com o objetivo de avaliar o efeito do resíduo da mineração de bauxita nos teores de macronutrientes, no solo e em plantas de cana-de-açúcar. Foram utilizados vasos de 10 L que receberam as seguintes doses de resíduo de bauxita: 0; 28;56; 84; 112 e 140 t ha-1, utilizando-se do clone de cana-de-açúcar SP92 4221. A incorporação do resíduo de bauxita no solo proporcionou aumento nos teores dos macronutrientes do solo, sendo que apenas para o enxofre doses acima de 83 t ha-1 proporcionaram reduções desse nutriente. Já para os teores de macronutrientes determinados na folha, doses acima de 70,5; 125; 101 e 56 t ha-1 diminuíram os teores de nitrogênio, fósforo, potássio e enxofre, respectivamente. Entretanto, para o cálcio e o magnésio, a utilização do resíduo proporcionou a diminuição dos seus teores foliares. A dose do resíduo de bauxita que teve a maior produção de massa seca foi de 64 t ha-1.The experiment was carried out in green house with the objective of evaluating the effect of the bauxite mining residue in the rates of macronutrients in sugarcane and soil. Containers of 10 L were used. They received the following rates of bauxite residue: 0; 28; 56; 84; 112 and 140 t ha-1 . The used culture was the sugarcane (SP92 4221. The incorporation of the bauxite residue in the soil provided an increase in the levels of the soil macronutrients, and only for sulphur levels above 83 t ha-1, it was possible to provide reductions of this nutrient. For rates of determined macronutrients in the leaf, levels above 70, 5; 125; 101; 56 t ha -1 diminished the rates of nitrogen, phosphorum, potassium and sulphur, respectively. However, for calcium and magnesium the use of the residue provided the reduction of leaf rates. The level of the bauxite residue which had the largest production of dry mass was 64 t ha-1.

  9. Philosophy evolution of the dose limitation system and the issue of replacements in the 'superseded' publications; Evolução da filosofia do sistema de limitação de dose e a questão das substituições 'superseded'

    Energy Technology Data Exchange (ETDEWEB)

    Correa, Felipe Ramos

    2016-07-01

    In 1958 the International Commission on Radiological Protection (ICRP) first proposed the philosophy of the dose limitation system by introducing the Permissible Maximum Annual Limits (PMAL). The breakthrough of the nuclear age in recent decades has imposed new paradigms and the need to update the philosophy in question. This work aims to present an analysis about the philosophy evolution of the dose limitation system, from the 50’s to the present day. The first paradigm shift occurred with the creation of Allowable Maximum Annual Limits (AMAL), still in force. Through a careful study of the International Atomic Energy Agency (IAEA) publications and the ICRP recommendations, it was possible to highlight and detail the process of evolution of AMAL over the past decades. The research addresses key moments that have driven change in the philosophy of the dose limitation system, for example, the international oil crisis and its implications in the development of nuclear area. The comparison of the various publications of the two entities (IAEA and ICRP) allowed a thorough study since the emergence of these philosophies to their latest publications. The results of this study indicate important information contained in ICRP publications, now considered {sup s}uperseded{sup ,} which are not found in current publications. The IAEA, which prepares its recommendations based on the philosophy of the ICRP, also does not address such information. Through this research, it was possible clear and detail valuable information that was lost during the process of updating publications and editing recommendations of both entities. This study aims to present this information, which were studied in depth, discussing their real value, proposing to the new international community reflections on the importance and the possibility of reintroducing the lost information in future publications. (author)

  10. Determination of {sup 210}Pb and {sup 210}Po in cigarette tobacco; Determinacao de {sup 210}Pb e {sup 210}Po em tabaco de cigarros nacionais

    Energy Technology Data Exchange (ETDEWEB)

    Peres, Ana Claudia

    1999-07-01

    Cigarette smoking is one of the important pathways that could contribute to enhance the radiation dose to man, due to the relatively large concentrations of {sup 210}Pb and {sup 210}Po found in tobacco leaves. In this work, concentrations of these two radionuclides were determined in eight of the most commercialized cigarette brands produced in Brazil. The samples analyzed were bought randomly in the market. The {sup 210}Pb was determined by counting the beta activity of the {sup 210}Bi in a gas flow proportional detector, after radiochemical separation and precipitation of the PbCr0{sub 4}. The {sup 210}Po was determined by alpha spectrometry, using a surface barrier detector, after radiochemical separation and spontaneous deposition of Po in copper disk. The results showed concentrations ranging from 11,9 to 30,2 mBq per gram of dry tobacco for {sup 210}Pb and from 10,9 to 27,4 mBq per gram of dry tobacco for {sup 210}Po. (author)

  11. Performance evaluation of the QC-6PLUS quality control system in terms of photons and electrons absorbed doses to water; Avaliacao do desempenho do sistema de controle da qualidade QC-6Plus em termos de dose absorvida na agua para fotons e eletrons

    Energy Technology Data Exchange (ETDEWEB)

    Teixeira, Flavia Cristina da Silva

    2004-06-15

    The quality of the treatment in radiotherapy depends on the necessary knowledge of the liberated dose in the tumor and of several other physical parameters and dosimetric that characterize the profile of the radiation field. Worrying about the reliability of some commercial equipment that aim at determining the main parameters of a radiation field in a practical way for daily checks in an institution with radiotherapy service, in this work a study of the performance of the quality assurance system, QC6-Plus manufactured by PTW-Freiburg for daily checks, was developed, in order to assure the use of this equipment with larger reliability level in the routine of quality assurance of the hospitals as well as to make possible its use in the Program of Regulatory Inspections of the Services of Radiotherapy of the Country accomplished by IRD/CNEN. The found results indicate that the system QC6-Plus is perfectly adapted and practical for relative measures of daily and weekly control of the main parameters of clinical beans in agreement with reference values recommended in TECDOC 1151. However for measurements of absolute dose it should not be used because, for beams of electrons the system does not present the necessary characteristics to execute this measure type in agreement with the reference protocol, TRS 398, and for photons of energy 15 MV presented a deviation in relation to the conventional method of absolute dosimetry of 7,7%, that it is a lot above the expected in agreement with TRS 398. (author)

  12. Application of low-dose gamma irradiation to extend the shelf life of minimally processed Red Beet (Beta vulgaris sp. vulgaris L.), cv. Early Wonder; Aplicacao de baixas doses de radiacao gama para extensao da vida util de beterraba vermelha (Beta vulgaris ssp. vulgaris L.), cv. Early Wonder, minimamente processada

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez, Nilber Kenup

    2006-07-01

    This study was aimed at investigating the effects of low-dose gamma irradiation on shelf-life extension and phyto sanitary safety of minimally processed red beet with basis on physicochemical; microbiological; chemical and sensory analyses. The samples (Beta vulgaris ssp. vulgaris L.), Early Wonder cultivar, were cultivated in the experimental area of the Horticulture Sector of the Departamento de Fitotecnia of the Instituto de Agronomia, Universidade Federal Rural do Rio de Janeiro, Seropedica, RJ, as part of two experiments performed during the second semester of 2005. In each experiment, 1200 plants (40 per linear meter of terrain) were sowed. Physicochemical analyses (fresh mass; length; average diameter and total soluble solids) of the edible part of the red beets (their tuberous roots) were periodically carried out in order to assess the most appropriate time for harvest by monitoring the development of the plants. Those times were found to be 104 and 73 days after transplanting, respectively. The harvested edible part of the roots were minimally processed and separated in two groups: (1) gamma irradiated (with doses of 0.5; 1.0 and 1.5 kGy) and (2) non-irradiated (control). All samples were stored at 8 degree C. Microbiological analyses were performed during the storage period (22 and 21 days, for experiments 1 and 2, respectively) in order to evaluate the phyto sanitary quality of the samples (Salmonella sp.; coliforms and total count of mesophilic aerobic and lactic acid bacteria). The samples irradiated with 1.0 and 1.5 kGy were found to remain appropriate for consumption for 21 days, as compared to only 7 days for the control. Monitoring of chemical composition was also performed and included the determination of saccharose; glucose; fructose and vitamins B1 and B2. No difference was found between the concentrations of those vitamins in irradiated and control samples at the end of the storage period, whereas significant changes in sugar contents were

  13. Filosofia da análise da estabilidade da liquidez

    Directory of Open Access Journals (Sweden)

    Rodrigo Antônio Chaves da Silva

    2005-07-01

    Full Text Available A informação foi considerada finalidade de nosso conhecimento, até o período em os pensadores e pesquisadores da contabilidade passaram a raciocinar sobre o conteúdo e o significado dos informes. Nesta busca da razão sobre os estados patrimoniais, surgiu a análise contábil que procura por meio de relações e identidades, o significado da dinâmica expressa da estaticamente na informação. O primeiro aspecto que surgiu no objeto de análise foi o estudo da liquidez, que é um dos principais exercícios do patrimônio. A estabilidade também é outro exercício básico e imprescindível, pois este é que promove o equilíbrio do organismo administrativo. A ciência contábil após a sua dignidade científica passou a trilhar caminhos esplendorosos, amparados em doutrina que permite alcançar os píncaros filosóficos. Os estudos concernentes aos aspectos de interação da estabilidade na liquidez são, complexos e somente com os recursos filosóficos da contabilidade se pode estudá-los com o panorama holístico e sublime. A filosofia da contabilidade não é alheia às suas práticas tecnológicas, podendo buscar pontos sublimes de panoramas abrangentes, para o estudo analítico da liquidez e estabilidade, observando todas as dimensionalidades e essencialidades de acontecimentos, na comprovação e orientação dos estados de ineficácia e eficácia patrimonial.

  14. Determination of bacterial endotoxin (pyrogen) in radiopharmaceuticals by the gel clot method. Validation; Determinacao de endotoxina bacteriana (pirogenio) em radiofarmacos pelo metodo de formacao de gel. Validacao

    Energy Technology Data Exchange (ETDEWEB)

    Fukumori, Neuza Taeko Okasaki

    2008-07-01

    Before the Limulus amebocyte lysate (LAL) test, the only available means of pirogenicity testing for parenteral drugs and medical devices was the United States Pharmacopoeia (USP) rabbit pyrogen test. Especially for radiopharmaceuticals, the LAL assay is the elective way to determine bacterial endotoxin. The aim of this work was to validate the gel clot method for some radiopharmaceuticals without measurable interference. The FDA's LALTest guideline defines interference as a condition that causes a significant difference between the endpoints of a positive water control and positive product control series using a standard endotoxin. Experiments were performed in accordance to the USP bacterial endotoxins test in the {sup 131}I- m-iodobenzylguanidine; the radioisotopes Gallium-67 and Thallium-201; the lyophilized reagents DTPA, Phytate, GHA, HSA and Colloidal Tin. The Maximum Valid Dilution (MVD) was calculated for each product based upon the clinical dose of the material and a twofold serial dilution below the MVD was performed in duplicate to detect interferences. The labeled sensitivity of the used LAL reagent was 0.125 EU mL{sup -1} (Endotoxin Units per milliliter). For validation, a dilution series was performed, a twofold dilution of control standard endotoxin (CSE) from 0.5 to 0.03 EU mL{sup -1}, to confirm the labeled sensitivity of the LAL reagent being tested in sterile and non pyrogenic water, in quadruplicate. The same dilution series was performed with the CSE and the product in the 1:100 dilution factor, in three consecutive batches of each radiopharmaceutical. The products {sup 131}I-m-iodobenzylguanidine, Gallium-67, Thallium-201, DTPA, HSA and Colloidal Tin were found compatible with the LAL test at a 1:100 dilution factor. Phytate and GHA showed some interference in the gel clot test. Other techniques to determine endotoxins as the chromogenic (color development) and the turbidimetric test (turbidity development), were also assessed to get valuable

  15. Analytical strategies for uranium determination in natural water and industrial effluents samples; Estrategias analiticas para determinacao de uranio em amostras de aguas e efluentes industriais

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Juracir Silva

    2011-07-01

    The work was developed under the project 993/2007 - 'Development of analytical strategies for uranium determination in environmental and industrial samples - Environmental monitoring in the Caetite city, Bahia, Brazil' and made possible through a partnership established between Universidade Federal da Bahia and the Comissao Nacional de Energia Nuclear. Strategies were developed to uranium determination in natural water and effluents of uranium mine. The first one was a critical evaluation of the determination of uranium by inductively coupled plasma optical emission spectrometry (ICP OES) performed using factorial and Doehlert designs involving the factors: acid concentration, radio frequency power and nebuliser gas flow rate. Five emission lines were simultaneously studied (namely: 367.007, 385.464, 385.957, 386.592 and 409.013 nm), in the presence of HN0{sub 3}, H{sub 3}C{sub 2}00H or HCI. The determinations in HN0{sub 3} medium were the most sensitive. Among the factors studied, the gas flow rate was the most significant for the five emission lines. Calcium caused interference in the emission intensity for some lines and iron did not interfere (at least up to 10 mg L{sup -1}) in the five lines studied. The presence of 13 other elements did not affect the emission intensity of uranium for the lines chosen. The optimized method, using the line at 385.957 nm, allows the determination of uranium with limit of quantification of 30 {mu}g L{sup -1} and precision expressed as RSD lower than 2.2% for uranium concentrations of either 500 and 1000 {mu}g L{sup -1}. In second one, a highly sensitive flow-based procedure for uranium determination in natural waters is described. A 100-cm optical path flow cell based on a liquid-core waveguide (LCW) was exploited to increase sensitivity of the arsenazo 111 method, aiming to achieve the limits established by environmental regulations. The flow system was designed with solenoid micro-pumps in order to improve mixing and

  16. Avaliação da tolerabilidade e do controle de ciclo de dois contraceptivos orais de baixa dose: estudo comparativo aberto Assessment of the tolerability and cycle control of two low-dose oral contraceptives: an open-label study

    Directory of Open Access Journals (Sweden)

    Edmund C. Baracat

    1998-06-01

    Full Text Available Realizou-se um estudo aberto comparativo em nove centros brasileiros para avaliar a tolerabilidade e o controle de ciclo obtido com o uso de dois contraceptivos orais de baixa dose contendo 20 mg etinilestradiol/75 mg gestodeno e 20 mg etinilestradiol/150 mg desogestrel, durante seis ciclos de tratamento. Foram selecionadas 167 mulheres saudáveis com vida sexual ativa (77 no grupo do gestodeno e 90 no grupo do desogestrel, das quais 138 completaram os seis ciclos de tratamento. Em um subgrupo de novas usuárias realizou-se também perfil lipídico e hemostático. Foram avaliados 867 ciclos no total. Ocorreu sangramento irregular em 4,6% dos ciclos com gestodeno e em 8,1% com desogestrel. A tolerabilidade a ambas preparações foi boa, mas houve significativamente mais náusea no grupo do desogestrel. O controle de ciclo foi bom com os dois contraceptivos, sendo que houve freqüência significativamente menor de sangramento irregular no grupo do gestodeno quando se leva em conta que todos os ciclos foram considerados. Não houve alterações clinicamente significativas no perfil hemostático. O perfil lipídico mostrou tendência a tornar-se mais favorável após seis ciclos de tratamento com as duas preparações. Não ocorreu alteração no peso médio das mulheres no grupo do gestodeno; no grupo do desogestrel houve aumento significativo no peso médio de aproximadamente 1 kg após seis meses de tratamento. A adesão ao tratamento foi boa com as duas preparações. Os resultados deste estudo mostram que preparações contendo baixa dose de gestodeno ou desogestrel associados a 20 mg de etinilestradiol são contraceptivos bem tolerados que permitem bom controle de ciclo, sem efeitos colaterais significantes.An open-label comparative study was conducted in nine centers in Brazil to evaluate the tolerability and cycle control of two low-dose oral contraceptives containing 20 mg ethynylestradiol/75 mg gestodene and 20 mg ethynylestradiol/150 mg

  17. Characterization of thermal neutron fields for calibration of neutron monitors in accordance with great equivalent dose environment H⁎(10); Caracterização de campos de nêutrons térmicos para a calibração de monitores de nêutrons em termos da grandeza equivalente de dose ambiente H⁎(10)

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Larissa P. S. da; Silva, Felipe S.; Fonseca, Evaldo S.; Patrao, Karla C.S.; Pereira, Walsan W. [Instituto de Radioproteção e Dosimetria (LNMRI/IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil). Laboratório Nacional de Metrologia das Radiações Ionizantes; Astuto, Achilles, E-mail: larissapaizante@poli.ufrj.br [Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ (Brazil)

    2017-07-01

    The Laboratório Brasileiro de Nêutrons do Instituto de Radioproteção e Dosimetria (IRD/CNEN) has developed and built a thermal neutron flux facility to provide neutron fluence for dosimeters (Astuto, 2014). This fluency is obtained by four 16 Ci sources {sup 241}AmBe (α, n) positioned around the channel positioned in the center of the Thermal Flow Unit (UFT). The UFT was built with blocks of paraffin with graphite addition and graphite blocks of high purity to obtain a central field with a homogeneous thermal neutron fluence for calibration purposes with the following measurements: 1.2 x 1.2 x 1.2 m{sup 3}. The objective of this work is to characterize several points, in the thermal energy range, in terms of the equivalent ambient dose quantity H⁎(10) for calibration and irradiation of monitors neutrons.

  18. Determination of bacterial endotoxin (pyrogen) in radiopharmaceuticals by the gel clot method. Validation; Determinacao de endotoxina bacteriana (pirogenio) em radiofarmacos pelo metodo de formacao de gel. Validacao

    Energy Technology Data Exchange (ETDEWEB)

    Fukumori, Neuza Taeko Okasaki

    2008-07-01

    Before the Limulus amebocyte lysate (LAL) test, the only available means of pirogenicity testing for parenteral drugs and medical devices was the United States Pharmacopoeia (USP) rabbit pyrogen test. Especially for radiopharmaceuticals, the LAL assay is the elective way to determine bacterial endotoxin. The aim of this work was to validate the gel clot method for some radiopharmaceuticals without measurable interference. The FDA's LALTest guideline defines interference as a condition that causes a significant difference between the endpoints of a positive water control and positive product control series using a standard endotoxin. Experiments were performed in accordance to the USP bacterial endotoxins test in the {sup 131}I- m-iodobenzylguanidine; the radioisotopes Gallium-67 and Thallium-201; the lyophilized reagents DTPA, Phytate, GHA, HSA and Colloidal Tin. The Maximum Valid Dilution (MVD) was calculated for each product based upon the clinical dose of the material and a twofold serial dilution below the MVD was performed in duplicate to detect interferences. The labeled sensitivity of the used LAL reagent was 0.125 EU mL{sup -1} (Endotoxin Units per milliliter). For validation, a dilution series was performed, a twofold dilution of control standard endotoxin (CSE) from 0.5 to 0.03 EU mL{sup -1}, to confirm the labeled sensitivity of the LAL reagent being tested in sterile and non pyrogenic water, in quadruplicate. The same dilution series was performed with the CSE and the product in the 1:100 dilution factor, in three consecutive batches of each radiopharmaceutical. The products {sup 131}I-m-iodobenzylguanidine, Gallium-67, Thallium-201, DTPA, HSA and Colloidal Tin were found compatible with the LAL test at a 1:100 dilution factor. Phytate and GHA showed some interference in the gel clot test. Other techniques to determine endotoxins as the chromogenic (color development) and the turbidimetric test (turbidity development), were also assessed to get

  19. From personnel dose to personal dose

    International Nuclear Information System (INIS)

    Hoefert, M.; Raffnsoe, R.C.; Tuyn, J.W.N.; Wittekind, D.

    1985-01-01

    From following the development of personnel doses at CERN over the past six years it has become evident that work in areas of induced radioactivity is the principal cause of exposure. The results of photon dose measurements free-in-air and around a phantom are presented and discussed in the light of new quantities in individual monitoring. The importance of these results, with respect to the practical situation, is discussed and the problem of phantom size is mentioned. Finally, the results of dose measurements in the phantom are presented, since such information is important in cases where it becomes necessary to transform personnel doses into personal doses. (author)

  20. Cardiopulmonary effects and eyeball centralization with low-dose atracurium in spontaneously breathing, anesthetized dogs Avaliação cardiopulmonar e da centralização do globo ocular em cães com baixas doses de atracúrio mantidos em anestesia inalatória sob ventilação espontânea

    Directory of Open Access Journals (Sweden)

    Adriano Bonfim Carregaro

    2010-07-01

    Full Text Available The objective was to determine the cardiopulmonary effects and eyeball centralization time obtained with 15 or 30µg kg-1 of atracurium in anesthetized dogs under spontaneous breathing. Eighteen healthy adult mixed-breed dogs were used, which received 0.1mg kg-1 acepromazine and 0.5mg kg-1 morphine IM, followed by 4mg kg-1 propofol IV and maintained on isoflurane anesthesia with spontaneous breathing. Animals received 1mL 0.9% NaCl IV (CG, 15µg kg-1 (G15 or 30µg kg-1 (G30 of atracurium IV. Eyeball centralization time was measured; heart rate (HR, systolic (SAP, mean (MAP and diastolic (DAP arterial pressures, respiratory rate (RR, tidal volume (Vt and minute volume (Vm were determined every 5min, and pH, arterial CO2 pressure (PaCO2 , arterial O2 pressure (PaO2 , hemoglobin oxygen saturation (SaO2 , bicarbonate (HCO3- and base excess (BE every 15min until 60min. Both doses of atracurium produced a similar period of eyeball centralization. Vt in groups treated with atracurium was lower than in CG up to 15min. Vm in G15 differed from CG up to 10min and in G30 up to 25min. No differences were observed for cardiovascular parameters, RR, SaO2, PaO2, HCO3- and BE. pH decreased in CG between 30 and 60min and in G15 and G30 at 15min. G30 differed from CG between 15 and 30min. PaCO2 in GC differed from baseline between 30 and 60min and in G15 differed at 15min. Atracurium at the dose of 15µg kg-1 is adequate for short corneal procedures in inhalant-anesthetized dogs under spontaneous breathing.Objetivou-se determinar os efeitos cardiopulmonares e o tempo de centralização do globo ocular obtidos com 15 ou 30µg kg-1 de atracúrio em cães anestesiados sob ventilação espontânea. Dezoito cães adultos foram pré-medicados com 0,1mg kg-1 de acepromazina e 0,5mg kg-1 de morfina IM, anestesiados com 4mg kg-1 de propofol IV e mantidos sob anestesia inalatória com isofluorano em ventilação espontânea. Os animais receberam 1mL de NaCl 0,9% IV (GC, 15

  1. Distribution of K, eU and Th and evaluation of annual radiation dose in the region of the Serra do Carambei Granite - PR; Distribuicao de K, eU e eTh e avaliacao da dose anual de radiacao na regiao do Granito Serra do Carambei - PR

    Energy Technology Data Exchange (ETDEWEB)

    Godoy, Luiz C., E-mail: luizcgodoy@brturbo.com.br [Departamento de Geociencias, Universidade Estadual de Ponta Grossa, PR (Brazil); Bittencourt, Andre V.L., E-mail: andre@ufpr.br [Laboratorio de Pesquisas Hidrogeologicas - LPH, Departamento de Geologia, Universidade Federal do Parana, Centro Politecnico, Curitiba, PR (Brazil); Santos, Leonardo J.C., E-mail: santos@ufpr.br [Laboratorio de Biogeografia e Solos - LABS, Departamento de Geografia, Universidade Federal do Parana, Centro Politecnico, Curitiba, PR (Brazil); Ferreira, Francisco J.F., E-mail: francisco.ferreira@ufpr.br [Laboratorio de Pesquisas em Geofisica Aplicada - LPGA, Departamento de Geologia, Universidade Federal do Parana, Centro Politecnico, Curitiba, PR (Brazil)

    2011-04-15

    is study was conducted in an area of 14 km in length oriented in the NNE direction by 7.3 km wide, covering the totality of the Serra do Carambei Granite and adjacent units. Located in the northern region of the Alagados dam, Parana State, this granite contains relatively high concentrations of K, eU and eTh, known since the 1970s through airborne and terrestrial gamma-ray spectrometry surveys. Recent radiochemical tests conducted on 61 samples of geological materials such as rocks (17 samples) and material of the weathering mantle and alluvial deposits (44 samples), confirmed the occurrence of radioactive anomalies in this granite, especially in thorium and uranium. The contents of K, eU and eTh obtained in gamma-ray spectrometry survey and radiochemical tests, converted to annual radiation dose (ARD), allowed to evaluate the intensity of natural radiation, whose levels relatively high in certain regions of the study area, can offer hazard to the local populations. The analysis and interpretation of data, as well the preparation of contour maps of K, eU and eTh were fundamental to understand the behavior and mobility of radionuclides in different environmental compartments of the area. (author)

  2. Effect of DA-8031, a novel oral compound for premature ejaculation, on male rat sexual behavior.

    Science.gov (United States)

    Kang, Kyung Koo; Sung, Ji Hyun; Kim, Soon Hoe; Lee, Sukhyang

    2014-03-01

    DA-8031 is a potent and selective serotonin transporter inhibitor developed for the treatment of premature ejaculation. The aim of the present study was to investigate the effects of DA-8031 on male sexual behavior in a rat model. Sexual behavior was examined after an acute oral administration of 10, 30 or 100 mg/kg of DA-8031 in copulation studies with female rats. Pharmacokinetic parameters were calculated after oral administration of DA-8031 at a dose level of 30 mg/kg. DA-8031 treatment produced a dose-dependent increase in ejaculation latency time and showed statistical significance at 30 and 100 mg/kg dosage levels compared with the vehicle (P DA-8031 treatment reduced the mean number of ejaculations in a dose-dependent manner. No changes in post-ejaculatory interval, numbers of mounts, intromissions or ejaculations were observed at any dose. In pharmacokinetic study, the blood concentration of DA-8031 peaked at 0.38 ± 0.14 h after oral administration, and then rapidly declined with a half-life of 1.79 ± 0.32 h. Treatment with DA-8031 delays the ejaculation latency time without affecting the initiation of mounting behavior or post-ejaculatory interval in rats. Furthermore, DA-8031 is rapidly absorbed and eliminated after oral administration in rats. These preclinical findings provide a clue for the clinical testing of DA-8031 as an "on-demand" agent for premature ejaculation. © 2013 The Japanese Urological Association.

  3. Dose sculpting with generalized equivalent uniform dose

    International Nuclear Information System (INIS)

    Wu Qiuwen; Djajaputra, David; Liu, Helen H.; Dong Lei; Mohan, Radhe; Wu, Yan

    2005-01-01

    With intensity-modulated radiotherapy (IMRT), a variety of user-defined dose distribution can be produced using inverse planning. The generalized equivalent uniform dose (gEUD) has been used in IMRT optimization as an alternative objective function to the conventional dose-volume-based criteria. The purpose of this study was to investigate the effectiveness of gEUD optimization to fine tune the dose distributions of IMRT plans. We analyzed the effect of gEUD-based optimization parameters on plan quality. The objective was to determine whether dose distribution to selected structures could be improved using gEUD optimization without adversely altering the doses delivered to other structures, as in sculpting. We hypothesized that by carefully defining gEUD parameters (EUD 0 and n) based on the current dose distributions, the optimization system could be instructed to search for alternative solutions in the neighborhood, and we could maintain the dose distributions for structures already satisfactory and improve dose for structures that need enhancement. We started with an already acceptable IMRT plan optimized with any objective function. The dose distribution was analyzed first. For structures that dose should not be changed, a higher value of n was used and EUD 0 was set slightly higher/lower than the EUD value at the current dose distribution for critical structures/targets. For structures that needed improvement in dose, a higher to medium value of n was used, and EUD 0 was set to the EUD value or slightly lower/higher for the critical structure/target at the current dose distribution. We evaluated this method in one clinical case each of head and neck, lung and prostate cancer. Dose volume histograms, isodose distributions, and relevant tolerance doses for critical structures were used for the assessment. We found that by adjusting gEUD optimization parameters, the dose distribution could be improved with only a few iterations. A larger value of n could lead to

  4. Efeitos de dose de nitrogênio, fósforo e potássio sobre os componentes da produção e a qualidade de bananas 'Prata Anã' no distrito agroindustrial de Jaíba Effects of nitrogen, phosphorous and potassium on components of production and quality of 'Prata Anã' banana in the Jaíba agro-industrial district

    Directory of Open Access Journals (Sweden)

    Victor Martins Maia

    2003-08-01

    Full Text Available Com o objetivo de verificar os efeitos da adubação nitrogenada, fosfatada e potássica sobre os componentes da produção e a qualidade de bananas 'Prata Anã', no Distrito Agroindustrial de Jaíba, em Matias Cardoso-MG, foi conduzido um experimento com dez tratamentos constituídos pela combinação de doses (g/touceira de N, P e K de acordo com uma matriz baconiana, sendo 1: 250-45-700, 2: 250-25-700, 3: 250-70-700, 4: 250-100-700, 5: 250-45-300, 6: 250-45-500, 7: 250-45-1000, 8: 150-45-700, 9: 400-45-700, 10: 600-45-700. O tratamento um é o de referência, correspondendo às doses adotadas pelos bananicultores da região. O delineamento foi de blocos ao acaso com quatro repetições. Avaliou-se a produção do primeiro ciclo. Os cachos foram colhidos, despencados e avaliados quanto ao número de pencas, número de frutos e massa do cacho, massa média das pencas e massa média, diâmetro e comprimentos total e comercial do fruto. Os resultados indicaram que as doses de nitrogênio ou fósforo utilizadas pelos produtores de banana do Distrito Agroindustrial de Jaíba podem ser reduzidas para 150 ou 25 g/touceira, respectivamente, sem prejuízo para a produção e qualidade dos frutos. Por outro lado, as doses de potássio até 1000 g/touceira, parceladas semanalmente, proporcionaram aumentos significativos na massa, comprimento total e comercial do fruto.An experiment was carried out in the Jaíba Agro-industrial District, located in Matias Cardoso, Minas Gerais, to evaluate the effect of nitrogen, phosphate and potassium fertilization on 'Prata Anã' banana production and quality. The experiment consisted of ten treatments with compound fertilizers using a baconian matrix (1: 250-45-700, 2: 250-25-700, 3: 250-70-700, 4: 250-100-700, 5: 250-45-300, 6: 250-45-500, 7: 250-45-1000, 8: 150-45-700, 9: 400-45-700, 10: 600-45-700 g/shoot of N, P and K, respectively, in which the first treatment includes the reference doses used by the region

  5. Analysis of the influence of well spacing on the injection rate behaviour for water injection under fracturing conditions; Analise da influencia do espacamento de pocos na determinacao da vazao de injecao para o processo de injecao com pressao cima da pressao de fratura

    Energy Technology Data Exchange (ETDEWEB)

    Munoz Mazo, Eduin Orlando [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Centro de Estudo do Petroleo. Lab. de Simulacao de Fluxo em Meios Porosos (UNISIM); Costa, Odair Jose; Schiozer, Denis Jose [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Faculdade de Engenharia Mecanica. Dept. de Engenharia de Petroleo

    2008-07-01

    Water injection under fracturing conditions is a proved manner of overcoming injectivity loss in reservoirs affected by formation damage. Nevertheless, as shown by Munoz Mazo et al. (2006), there is the possibility of the generated and propagated fractures intercept the producer wells making that the injected water shall be re-circulated into the reservoir instead of its main function which is to drive the oil contained in the reservoir pore space. The objective of this work is to determine the influence of well spacing on the determination of the water injection rate under fracturing conditions, aiming to study its effects on the production performance and the sweep efficiency. To accomplish the work, an analytical model for representing the absolute permeability reduction near the wellbore and a model which reproduces the fracture propagation in a coupled manner are used. In this way the model sensitivity to several well spacing and the injection rate effects are analyzed using the Net Present Value and the sweep efficiency is evaluated as a function of the Recovery Factor. The results show that the water injection under fracturing conditions is an effective way of overcoming the injectivity loss problem and evidence its sensitivity to different spacing between the injector and the producer wells. (author)

  6. A Sintaxe da Janela

    Directory of Open Access Journals (Sweden)

    Luís Antônio Jorge

    1993-12-01

    Full Text Available A preocupação fundamenta! do trabalho é de caráter ontológico: esboçar o problema das significações apriorísticas e autônomas dos elementos que compõem a sintaxe arquitetônica. O trabalho elege um desses elementos: a janela. Este artigo parte da aproximação histórica entre a janela e a secção da pirâmide visual, construção imaginária da teoria da perspectiva renascentista. A consideração da janela na linguagem arquitetônica implica reconhecer uma ambigüidade essencial: a janela deve inserir-se ordenadamente no plano da parede - raciocínio típico da modenatura - mas também relacionar-se com a imagem vista através dela, que extrapola o plano, ressaltando a tridimensionalidade - herança da perspectiva renascentista, fundamentada no espaço euclidiano. Ver janela ou ver através da janela são alternativas que se colocam tanto ao observador interno ao edifício, quanto ao externo. Texto de duplaface, a sintaxe da janela versa sobre o relacionamento desses dois lados

  7. Acompanhamento laboratorial da função renal de cães sadios tratados experimentalmente com doses terapêuticas de anfotericina B Laboratorial accompaniment of kidney funtion of health dogs experimentally treated with therapeutic dosages of amphotericin B

    Directory of Open Access Journals (Sweden)

    Flávia Santin

    2006-12-01

    Full Text Available O presente trabalho objetivou avaliar a função renal de dez cães adultos saudáveis submetidos à administração de doses terapêuticas do antifúngico anfotericina B, cuja utilização tem sido limitada pelo seu elevado potencial nefrotóxico, e avaliar o método laboratorial mais sensível e precoce de diagnóstico de lesão renal. Foram realizadas, diariamente, urinálise, excreção fracionada de sódio e potássio, dosagem sérica de creatinina e uréia e atividade urinária de gama-glutamiltransferase (GGT. Concluiu-se que a anfotericina B provoca lesões nos túbulos proximal e distal, induzindo acidose tubular renal do tipo I e Diabetes insipidus nefrogênico em cães. Avaliação da função renal, preferencialmente por dosagens de creatinina, uréia e potássio séricos, é recomendada antes de cada aplicação do fármaco. A densidade urinária foi o parâmetro mais precocemente alterado pela lesão renal. A GGT urinária não foi eficaz para o diagnóstico precoce de lesão induzida por anfotericina B.The objective of this experiment was to assess the renal function of ten healthy male adult dogs submitted to therapeutic doses of amphotericin B, whose use has been limited due to its high nephrotoxic potential, as well as to evaluate the more sensitive and early method to diagnose kidney lesions. The renal function was evaluated through daily urinalysis, fractioned excretion of sodium and potassium, serum concentration of creatinine and blood urea nitrogen (BUN and urinary activity of gamma-glutamyltransferase (GGT. It was concluded that amphotericin b provokes lesions in both proximal and distal tubules, inducing type I renal tubular acidosis and nephrogenic Diabetes insipidus in dogs. Renal function evaluation, preferably by serum creatinine, BUN and potassium dosage is recommended before each drug application. Urinalysis proved to diagnose kidney lesions in its earliest stage through a modification of the density parameters

  8. Pocket total dose meter

    International Nuclear Information System (INIS)

    Brackenbush, L.W.; Endres, G.W.R.

    1984-10-01

    Laboratory measurements have demonstrated that it is possible to simultaneously measure absorbed dose and dose equivalent using a single tissue equivalent proportional counter. Small, pocket sized instruments are being developed to determine dose equivalent as the worker is exposed to mixed field radiation. This paper describes the electronic circuitry and computer algorithms used to determine dose equivalent in these devices

  9. On dose distribution comparison

    International Nuclear Information System (INIS)

    Jiang, Steve B; Sharp, Greg C; Neicu, Toni; Berbeco, Ross I; Flampouri, Stella; Bortfeld, Thomas

    2006-01-01

    In radiotherapy practice, one often needs to compare two dose distributions. Especially with the wide clinical implementation of intensity-modulated radiation therapy, software tools for quantitative dose (or fluence) distribution comparison are required for patient-specific quality assurance. Dose distribution comparison is not a trivial task since it has to be performed in both dose and spatial domains in order to be clinically relevant. Each of the existing comparison methods has its own strengths and weaknesses and there is room for improvement. In this work, we developed a general framework for comparing dose distributions. Using a new concept called maximum allowed dose difference (MADD), the comparison in both dose and spatial domains can be performed entirely in the dose domain. Formulae for calculating MADD values for various comparison methods, such as composite analysis and gamma index, have been derived. For convenience in clinical practice, a new measure called normalized dose difference (NDD) has also been proposed, which is the dose difference at a point scaled by the ratio of MADD to the predetermined dose acceptance tolerance. Unlike the simple dose difference test, NDD works in both low and high dose gradient regions because it considers both dose and spatial acceptance tolerances through MADD. The new method has been applied to a test case and a clinical example. It was found that the new method combines the merits of the existing methods (accurate, simple, clinically intuitive and insensitive to dose grid size) and can easily be implemented into any dose/intensity comparison tool

  10. When is a dose not a dose?

    International Nuclear Information System (INIS)

    Green, Patrick

    1992-01-01

    There is confusion over radiation dose limits between the International Commission on Radiological Protection, the National Radiological Protection Board and the Ministry of Agriculture, Fisheries and Food (MAFF), reports a Friends of the Earth's radiation campaigner. MAFF is suggesting the inadequate ICRP public dose limit does not apply to public exposures which arise from environmental contamination from past radioactive discharges. (author)

  11. Dose from radiological examinations

    International Nuclear Information System (INIS)

    Imamura, Keiko; Uji, Teruyuki; Sakuyama, Keiko; Fujikawa, Mitsuhiro; Fujii, Masamichi

    1976-01-01

    Relatively high gonad doses, several hundred to one thousand mR, have been observed in case of pelvis, hip-joint, coccyx, lower abdomen and lumber examination. Dose to the ovary is especially high in barium enema and I.V.P. examinations. About 12 per cent of the 4-ray examination are high-dose. The gonad dose is relatively high in examination of abdomen and lower extremities, in infants. The dose to the eyes is especially high, 1.0 to 2.5R per exposure, in temporal bone and nasal sinuses tomography. X-ray doses have been compared with dose limits recommended by ICRP and with the gonad dose from natural radiations. The gonad dose in lumbar examination, barium enema, I.V.P. etc. is as high as the maximum permissible dose per year recommended by ICRP. Several devices have been made for dose reduction in the daily examinations: (1) separating the radiation field from the gonad by one centimeter decreases the gonad dose about one-half. (2) using sensitive screens and films. In pelvimetry and in infant hip-joint examination, the most sensitive screen and film are used. In the I.V.P. examination of adult, use of MS screen in place of FS screen decreases the dose to one-third, in combination with careful setting of radiation field, (3) use of grid increases the dose about 50 percent and the lead rubber protection (0.1mm lead equivalent) decreases the gonad dose to one-thirtieth in the spinal column examination of infant, (4) A lead protector, 1mm thickness and 2.5cm in diameter, on the eyes decreases the dose to about one-eighth in the face and nead examinations. These simple and effective methods for dose reduction. Should be carried out in as many examinations as possible in addition to observing dose limits recommended by ICRP. (Evans, J.)

  12. Tópicos da teoria da relatividade

    OpenAIRE

    Fragata, Paulo Renato Ferreira

    2013-01-01

    Dissertação de Mestrado, Matemática para Professores, 25 de Outubro 2013, Universidade dos Açores. Qualquer descrição física da natureza tem por base a especificação da posição e do instante em que decorre determinado acontecimento. Para tal, é necessário recorrer a um sistema de coordenadas, escolhido por cada observador, do modo que ele achar mais pertinente. Dada a generalidade na escolha do sistema de coordenadas, é útil conhecer as regras que nos permitem comparar cálculos feitos em d...

  13. Optimization of Fluosol-DA administration during a fractionated radiation protocol in the Lewis lung carcinoma

    International Nuclear Information System (INIS)

    Teicher, B.A.; McIntosh, N.L.

    1987-01-01

    The perfluorchemical emulsion, Fluosol-DA, in combination with breathing a 100% or 95% oxygen atmosphere, has been shown to enhance the response of several solid rodent tumors to single dose and fractionated radiation treatment. As an approach to determining the optimal dose schedule for Fluosol-DA during a course of fractionated radiation therapy, a total dose of 16 ml/kg of Fluosol-DA was administered either as two doses of 8 ml/kg on days 1 and 3 or as four doses of 4 ml/kg on days 1,2,3 and 4 of a four day protocol using the Lewis lung tumor model system. The Lewis lung tumor was grown s.c. in the flanks of C57BL/6J mice. Treatment was initiated when the tumors were 50-100 mm/sup 3/. Radiation was delivered as 4 daily fractions of 2.5, 4.0 or 5.0 Gray. Fluosol-DA was adminstered i.v. prior to irradiation. Each day carbogen breathing was maintained for 1 hr prior to and during each x-ray treatment. When Fluosol-DA was administered as two doses of 8 ml/kg, the dose modifying factor (DMF) observed was 1.7 +- 0.3. When Fluosol-DA was given as four doses of 4 ml/kg, the DMF was 1.5+-0.3 compared to x-ray treatment with carbogen breathing. It appears, therefore, administering Fluosol-DA at a therapeutic dose less frequently with carbogen breathing with every fraction may produce a better treatment outcome than giving more frequent lower doses

  14. Insignificant levels of dose

    International Nuclear Information System (INIS)

    Webb, G.A.M.; McLean, A.S.

    1977-01-01

    The procedures recommended by the International Commission on Radiological Protection (ICRP) for making decisions concerning controllable sources of radiation exposure of the public include 'justification' and 'optimisation'. The tool recommended by the ICRP for reaching these decisions is collective dose or dose commitment supplemented by consideration of doses to individuals. In both these considerations the practical problem arises of whether very small doses to large numbers of people should contribute to the final decision-making process. It may be that at levels of dose which are small increments on natural background, the relationship between dose and effect is linear even though the slope may be close to zero. If so, collective dose is a meaningful concept and the calculation of total detriment for the purpose of justification could legitimately include all doses. In the calculation of collective doses for the purpose of optimisation, which involves decisions on how much money or resource should be allocated to dose reduction, it is necessary to appraise radiation detriment realistically. At low levels of dose to the individual such as those small by comparison with variations in natural background within the UK, the risk to the individual is such that his well-being will not be significantly changed by the presence or absence of the radiation dose. These small doses, which are well below the point at which an individual attaches significance, should not carry a societal significance. Societal acceptance of risk is analysed with a view to assessing a level of possible risk, and hence dose, below which resources should not in general be diverted to secure further reduction. A formulation for collective dose commitment is proposed incorporating a cut-off to exclude insignificant doses. The implications of this formulation in practical situations are discussed

  15. Influencia da aplicação de biofertilizantes na qualidade da produção da bananeira nanica (1º ciclo

    Directory of Open Access Journals (Sweden)

    Pedro B. Torres

    2014-04-01

    Full Text Available A agricultura orgânica é baseada em um sistema holístico, compatibilizando a produção de alimentos sem a utilização de insumos químicos na lavoura, aliado ao baixo custo de produção. Objetivou-se estudar os efeitos de tipos e doses de biofertilizantes na qualidade da produção da bananeira nanica (1º ciclo. Utilizou-se 5 tipos de biofertilizante e 10 doses de biofertilizantes (0; 0,3; 0,6; 0,9; 1,2; 1,5; 1,8; 2,1; 2,4 e 2,7 L planta-1 aplicação-1. A pesquisa foi conduzida, em condições de campo, no período de 20 de março de 2010 à maio de 2011, no CCHA da Universidade Estadual daParaíba, Campus Catolé do Rocha-PB. O delineamento experimental adotado foi o de blocos casualizados, com 50 tratamentos, no esquema fatorial 5 x 10, com quatro repetições, totalizando 200 plantas experimentais. Os maiores valores de diâmetro do fruto médio e diâmetro da polpa do fruto médio foram obtidos com a dose máxima de 2,7 L planta-1/aplicação-1 biofertilizante B1; O valor máximo do ºBrix da polpa do fruto médio foi obtido com a dose ótima do biofertilizante B4 (1,52 L planta-1/aplicação-1.

  16. Avaliação da cetamina racêmica e do isômero S(+, associados ou não a baixas doses de fentanil, na balneoterapia do grande queimado Evaluación de la cetamina racémica y del isómero S(+, asociados o no a bajas dosis de fentanil, en la balneoterapia del gran quemado Assessment of the use of racemic ketamine and its S(+ isomer, associated or not with low doses of fentanyl, in balneotherapy for major burn patients

    Directory of Open Access Journals (Sweden)

    Fernando Antônio de Freitas Cantinho

    2009-08-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O cuidado da ferida do grande-queimado desencadeia estímulo doloroso muito intenso. Este estudo teve por objetivo avaliar a segurança e efetividade de diferentes combinações de fármacos na anestesia para balneoterapia. MÉTODO: Com a aprovação do Comitê de Ética, foram estudados 200 procedimentos de balneoterapia em 87 grandes queimados adultos. Em todos os casos foi empregado o midazolam. Foram utilizados frascos numerados da cetamina, não se conhecendo no momento do uso se era racêmica ou S(+. A cada manhã era sorteado se os procedimentos daquele dia seriam conduzidos com ou sem fentanil. Formaram-se quatro grupos: ISO/sf (isômero S(+ sem o fentanil, ISO/cf (isômero S(+ com o fentanil, RAC/sf (cetamina racêmica sem o fentanil e RAC/cf (cetamina racêmica com o fentanil. As doses iniciais propostas foram: midazolam 0,06 mg.kg-1, cetamina 1,0 a 1,1 mg.kg-1, fentanil 0,8 ¼g.kg-1; as doses adicionais eram administradas conforme necessário. RESULTADOS: Em apenas um caso houve lembrança de dor durante a balneoterapia. No grupo que recebeu a cetamina S(+, o acréscimo do fentanil não evidenciou vantagens; associado à forma racêmica, o fentanil reduziu a dose total e o número de bolus da cetamina. A extensão da superfície corporal queimada foi a principal determinante da intensidade de dor pós-procedimento. A menor intensidade de dor pós-procedimento foi o principal fator considerado pelo paciente para sua satisfação pela anestesia recebida. CONCLUSÕES: As quatro diferentes combinações de fármacos mostraram-se seguras e permitiram ausência de dor durante a balneoterapia. Características não ligadas diretamente aos anestésicos mostraram-se de maior importância na definição da dor pós-procedimento, que foi a principal característica considerada pelo grande queimado para definir sua satisfação com a anestesia recebida.JUSTIFICATIVA Y OBJETIVOS: El cuidado de la herida del gran quemado

  17. MACIEZ DA CARNE BOVINA

    Directory of Open Access Journals (Sweden)

    Antonio Bento Mancio

    2006-10-01

    Full Text Available Dentre as características de qualidade da carne bovina, a maciez assume posição de destaque, sendo considerada a característica organoléptica de maior influência na aceitação da carne por parte dos consumidores. A dureza da carne pode ser dividida em dureza residual, causada pelo tecido conjuntivo e outras proteínas do estroma, e dureza de actomiosina, causada pelas proteínas miofibrilares. Dentre os fatores que influenciam a maciez da carne, podem ser destacados a genética, a raça, a idade ao abate, o sexo, a alimentação, o uso de agentes hormonais (?-adrenérgicos e os tratamentos post-mortem. A qualidade final da carne é resultante de tudo o que aconteceu com o animal durante toda a cadeia produtiva. Devem-se assegurar procedimentos adequados de transporte, armazenamento, manipulação, exposição e preparo da carne, a fim de se obter um produto de melhor qualidade. PALAVRAS-CHAVE: Calpaínas, calpastatina, qualidade da carne, rigor mortis, tecido muscular.

  18. Total dose meter development

    International Nuclear Information System (INIS)

    Brackenbush, L.W.

    1986-09-01

    This report describes an alarming ''pocket'' monitor/dosimeter, based on a tissue-equivalent proportional counter, that measure both neutron and gamma dose and determines dose equivalent for the mixed radiation field. This report details the operation of the device and provides information on: the necessity for a device to measure dose equivalent in mixed radiation fields; the mathematical theory required to determine dose equivalent from tissue equivalent proportional; the detailed electronic circuits required; the algorithms required in the microprocessor used to calculate dose equivalent; the features of the instrument; program accomplishments and future plans

  19. Dose reader CD-02

    International Nuclear Information System (INIS)

    Jakowiuk, A.; Kaluska, I.; Machaj, B.

    2005-01-01

    Dose Reader CD-02 is designed for measurement of dose from a long narrow band of dosimetric foil used for check up and control of electron beam dose during sterilization of materials and products on conveyor belt. Irradiated foil after processing (heating) is inserted into foil driving (moving) system and when the foil is moved across focused light beam the absorbed dose is measured and displayed at the same time at computer monitor (in form of a diagram). The absorbed dose is measured on the principle of light attenuation at selected light wavelength (foil absorbance is measured). (author)

  20. Dose conversion factors

    International Nuclear Information System (INIS)

    Kocher, D.C.; Eckerman, K.F.

    1992-01-01

    The following is discussed in this report: concepts and quantities used in calculating radiation dose from internal and external exposure. Tabulations of dose conversion factor for internal and external exposure to radionuclides. Dose conversion factors give dose per unit intake (internal) or dose per unit concentration in environment (external). Intakes of radionuclides for internal exposure and concentrations of radionuclides in environment for external exposure are assumed to be known. Intakes and concentrations are obtained, e.g., from analyses of environmental transport and exposure pathways. differences between dosimetry methods for radionuclides and hazardous chemicals are highlighted

  1. GERONTOLOGIA: ESTADO DA ARTE

    Directory of Open Access Journals (Sweden)

    Vera M.A.Tordino Brandão

    2010-02-01

    Full Text Available O Programa de Gerontologia da PUC desenvolve pesquisas focando o ser na perspectiva do envelhecimento. As atividades são interdisciplinares e reúnem docentes, alunos e ex-alunos. Nesta mesa redonda apresentamos um panorama sobre estes estudos. Na área da educação e comunicação o foco está centrado na longevidade e na preparação e representação social da velhice. São ressaltadas como temáticas: a formação continuada de profissionais e pesquisadores; o significado da religiosidade/espiritualidade ao longo da trajetória, e sua repercussão na qualidade de vida do idoso; os programas sócio-educacionais para idosos e concepções sobre educação; o monitoramento da mídia na cobertura da crescente longevidade e seus impactos. Em identidade e modos de morar reflete-se sobre soluções planejadas e sua adequação para a inclusão do envelhecimento populacional como questão fundamental, que implica a elaboração de novas políticas, investigações e, especialmente, apresenta-se como questão a ser analisada, refletida e vivenciada pela sociedade em geral. Quanto à saúde, o Programa desenvolve várias pesquisas numa abordagem interdisciplinar tendo como objetos de estudo: a terapia assistida com animais direcionada a idosos com diagnóstico de Alzheimer; o acompanhamento terapêutico e o atendimento psicoterapêutico em grupo, a aplicação da técnica de Calatonia em idosos moradores de ILPI, além da investigação sobre impasses clínicos no idoso frágil. Palavras-chave: gerontologia, longevidade, envelhecimento

  2. Conjecturas da Epistemológia Jurídica e Aspectos da Teoria da Linguagem

    OpenAIRE

    Oliveira, Rita de Cássia Cartelli de; Cesumar; Motta, Ivan Dias; Cesumar

    2008-01-01

    Apresentar-se-ão reflexões em torno da epistemologia jurídica e alguns aspectos da teoria da linguagem; a necessidade de acompanhamento e aprimoramento da linguagem jurídica, para que o direito não se distancie da realidade, mantendo-se apenas como um sistema do status quo; uma breve análise de algumas teorias da ciência do direito e da linguagem; as especificidades dos termos lingüísticos para a análise da ciência do direito, pautada na contemporaneidade sob a perspectiva humanista, buscando...

  3. CONDICIONANTES DA COMPETITIVIDADE EMPRESARIAL

    Directory of Open Access Journals (Sweden)

    José Luiz Contador

    2010-03-01

    Full Text Available Este trabalho examina teoricamente os fatores determinantes da competitividade do produto e do negócio, imprescindíveis à elaboração de estratégias competitivas que visam à obtenção e sustentação de vantagens competitivas. Esse tema é objeto tanto da área de marketing estratégico quanto da de estratégia empresarial. Nas duas áreas, há um ponto de consenso que afirma que a empresa deve diferenciar sua oferta para conquistar e manter vantagem competitiva. Mas, os estudos conduzidos por meio do modelo de Campos e Armas da Competição revelaram que a empresa pode diferenciar seu produto e/ou serviço de modo mais amplo, levando em consideração, na formulação da sua estratégia competitiva, também o campo da competição, quer do produto, quer dela própria. Assim, o objetivo deste artigo é evidenciar que, para a empresa ser competitiva, além de diferenciar seu produto e/ou seu serviço no sentido tradicional, ela precisa: 1 diferenciar seu produto incluindo a definição em quais campos vai competir em cada segmento; e 2 escolher as armas da competição que irá utilizar e definir a intensidade de cada arma. Para atingir tal objetivo, foram necessários vários conceitos do modelo de Campos e Armas da Competição: campo da competição, arma da competição, tese do modelo, configuração dos campos da competição, campo coadjuvante, produto coadjuvante e par produto-mercado. Como uma proposta inovadora sempre desperta dúvida, é mostrado o processo de validação do modelo de Campos e Armas da Competição e são discutidas sua universalidade, consistência e completude.

  4. CONTROLE DA LAGARTA DA SOJA (Anticarsia gemmatalis Hübner, 1818 - LEPIDOPTERA: NOCTUIDAE. III. TIODICARBE

    Directory of Open Access Journals (Sweden)

    Mauro Tadeu Braga da Silva

    1993-04-01

    Full Text Available Verificou-se, em Cruz Alta, RS, a eficiência de diversas doses de tiodicarbe (Larvin 350 RA, no controle da lagarta da soja, Anticarsia gemmatalis, durante a safra agrícola de 1989/90. A aplicação dos tratamentos foi feita com pulverizador costal de precisão (CO2, equipado com bicos cônicos JD 10-1, numa pressão de 60 libras/pol² e volume de calda de 115 litros/ha. No dia da aplicação, as plantas de soja (cv.Cobb estavam com um (01 metro de altura, no estádio R1, e uma infestação entre 43 e 46 lagartas grandes (> 1,5cm por dois metros de fileira. Avaliou-se o número de lagartas vivas aos 0, 2, 4, 7 e 10 dias após a aplicação, a desfolha aos 15 e 30 dias após a aplicação e a produção de grãos. Os resultados indicaram que tiodicarbe controla eficientemente lagartas de A. gemmatalis a partir da dose de 35g i.a./ha.

  5. Braquiterapia de alta taxa de dose no Brasil High-dose rate brachytherapy in Brazil

    Directory of Open Access Journals (Sweden)

    Sérgio Carlos Barros Esteves

    2004-10-01

    Full Text Available A braquiterapia de alta taxa de dose foi introduzida em nosso meio em janeiro de 1991. Desde então, houve uma mudança significativa na abordagem das neoplasias malignas em relação às vantagens do novo método, e também resolução da demanda reprimida de braquiterapia para as neoplasias ginecológicas. Nos primeiros dez anos de atividade, o Brasil tratou, em 31 serviços, 26.436 pacientes com braquiterapia, sendo mais de 50% das pacientes portadoras de neoplasias do colo uterino. Este estudo mostra o número e o perfil de pacientes tratados com esse método e a sua distribuição no território nacional, deixando explícito o benefício da braquiterapia de alta taxa de dose para o Brasil.High-dose rate brachytherapy was first introduced in Brazil in January 1991. Significant changes in the management of malignant neoplasms were observed since utilization of high-dose rate brachytherapy. The high number of gynecological patients awaiting for brachytherapy also decreased during this period. In the first ten years 26,436 patients were treated with high-dose rate brachytherapy. More than 50% of these patients presented neoplasms of the uterine cervix. In this study we present the number and profile of the patients treated with high-dose rate brachytherapy as well as the distribution of these patients in the Brazilian territory, proving the benefit of the use of high-dose rate brachytherapy in Brazil.

  6. Efeito da eutonia no tratamento da fibromialgia

    OpenAIRE

    Maeda,Cecília; Martinez,José Eduardo; Neder,Matilde

    2006-01-01

    OBJETIVO: avaliar a eutonia como método terapêutico auxiliar no tratamento da fibromialgia (FM). MÉTODOS: estudou-se um grupo de 20 mulheres, segundo os critérios do American College of Rheumatology (ACR), com duração mínima de seis meses, sem alterações no tratamento medicamentoso ou prescrição de exercícios nesse período. As pacientes foram avaliadas através do questionário de dados sociodemográficos; Escala Visual Analógica (EVA) para dor e questionário genérico de avaliação da qualidade d...

  7. Het Italiaanse voorzetsel da

    NARCIS (Netherlands)

    Boer, M.G. de

    2010-01-01

    SAMENVATTING In een voorzetselstudie in het kader van Jackendoffs semantische theorie wordt het sterk polyseme Italiaanse voorzetsel da geanalyseerd als een verzameling deelbetekenissen waarbij de meeste door een of meer semantische regels afgeleid kunnen worden van de basisbetekenis ruimtelijke

  8. ESPECTROS INFRAVERMELHOS DA CREATINA

    Directory of Open Access Journals (Sweden)

    Kumiko K. Sakane

    2011-08-01

    Full Text Available São apresentados espectros infravermelhos da creatina, na faixa de 4000 a 400 cm−1. Os resultados são comparados com espectros observados e calculados, publicados na literatura.

  9. Significados Ocultos da Enfermagem

    Directory of Open Access Journals (Sweden)

    Wiliam César alves Machado

    2011-04-01

    Full Text Available Sabe-se que as ações de cuidar em enfermagem foram sendo moldadas através da história da humanidade e deram-se, majoritariamente, na esfera do subjetivo que permeia as interações existenciais do ser humano que cuida e daquele que recebe cuidados. Campo fecundo para intercâmbios eletromagnéticos. Suas origens remontam ao cuidado prestado por mães, pais, avós, irmãos e demais familiares incumbidos da responsabilidade de ajudar entes recém-natos, crianças, doentes e idosos em suas necessidades de cuidados para preservação da vida.

  10. Enjebi Island dose assessment

    International Nuclear Information System (INIS)

    Robison, W.L.; Conrado, C.L.; Phillips, W.A.

    1987-07-01

    We have updeated the radiological dose assessment for Enjebi Island at Enewetak Atoll using data derived from analysis of food crops grown on Enjebi. This is a much more precise assessment of potential doses to people resettling Enjebi Island than the 1980 assessment in which there were no data available from food crops on Enjebi. Details of the methods and data used to evaluate each exposure pathway are presented. The terrestrial food chain is the most significant potential exposure pathway and 137 Cs is the radionuclide responsible for most of the estimated dose over the next 50 y. The doses are calculated assuming a resettlement date of 1990. The average wholebody maximum annual estimated dose equivalent derived using our diet model is 166 mremy;the effective dose equivalent is 169 mremy. The estimated 30-, 50-, and 70-y integral whole-body dose equivalents are 3.5 rem, 5.1 rem, and 6.2 rem, respectively. Bone-marrow dose equivalents are only slightly higher than the whole-body estimates in each case. The bone-surface cells (endosteal cells) receive the highest dose, but they are a less sensitive cell population and are less sensitive to fatal cancer induction than whole body and bone marrow. The effective dose equivalents for 30, 50, and 70 y are 3.6 rem, 5.3 rem, and 6.6 rem, respectively. 79 refs., 17 figs., 24 tabs

  11. ORIGEM DA ANGTIA MODERNA

    Directory of Open Access Journals (Sweden)

    Edvino Rabuske

    1971-01-01

    Full Text Available O tema que me foi proposto "origem da angtia moderna". Por certo, um tema extremamente complexo. Trata-se de surpreender as modalidades modernas de um fenomeno, antigo como o prrio homem. Visando contribuir numa semana de reflexo sobre a esperan crist em, que esta abordada a partir, de diversos gulos, parece indicado que esta exposio n se atenha a um ico aspeto da angtia.

  12. Dose measurements in mammography

    International Nuclear Information System (INIS)

    Kainberger, F.; Kallinger, W.

    1977-01-01

    Dose measurements at the mamma during mammography were carried out in the form of direct measurement with thermoluminescent dosimetry. Measurement was done for the in- and outcoming doses at the mamma, the dose exposure of the sternal region and the scattered rays above the symphysis, the latter as parameter for the genetic radiation exposure. As expected, the dose of the smooth radiation used for mammography showed a strong decrease at the outcome point in comparison with the income point. Surprisingly high was the scattered radiation in the sternal region. A corresponding protection by lead plates could be taken into consideration. Extremely low is the scattered radiation above the symphysis. Even measurements with the very sensitive calcium fluoride dosimeters did not reveal any practically important dose in the symphysis region. Most measurement values remained below the determinable dose of 0.3mR. Some maximal values varied in the range of 3-1 mR. (orig.) [de

  13. Registration of radiation doses

    International Nuclear Information System (INIS)

    2000-02-01

    In Finland the Radiation and Nuclear Safety Authority (STUK) is maintaining the register (called Dose Register) of the radiation exposure of occupationally exposed workers in order to ensure compliance with the principles of optimisation and individual protection. The guide contains a description of the Dose Register and specifies the responsibilities of the party running a radiation practice to report the relevant information to the Dose Register

  14. DA1 receptors modulation in rat isolated trachea.

    Science.gov (United States)

    Cabezas, Gloria A; Velasco, Manuel

    2010-01-01

    We have previously demonstrated that low dose of inhaled dopamine (0.5-2 microg kg(-1) min(-1)) induces broncodilatacion in patients with acute asthma attack, suggesting that this dopamine effect is mediated by dopaminergic rather than by adrenergic receptors. To understand better these dopamine effect, rat tracheal smooth muscle was used as a model to evaluate the responses of beta2-, alpha1-, alpha2-adrenergic and DA1 and DA2 dopaminergic antagonists. Tracheal rings from male Sprague-Dawley rats (n = 90) were excised and placed in an organ bath containing modified Krebs-Ringer bicarbonate buffer at 37 degrees C, and gassed with O2 (95%) and CO2 (5%). Contractile responses were recorded with an isometric transducer in a polygraph (Letica, Spain). Contraction was induced by accumulative doses of acetylcholine (0.1, 0.3, 1, 3, 10 mM) or by electric field stimulation (10 Hz at 2 milliseconds), and accumulative doses of dopamine were added to the bath. Low concentration (0.1-0.3 mM) elicited a small initial contraction, followed by a marked relaxation. Cholinergic contraction was completely reversed at 6 mM of dopamine. This biphasic dopaminergic response was not blocked by incubation with beta2-adrenergic antagonist propranolol (0.1 microM), alpha1-antagonist, terazosin (0.1 mM), alpha2-antagonist, yohimbine (0.1 mM), or by DA2 antagonist metoclopramide (1-8 mM); DA1 antagonist SCH23390 (0.1 microM) produced a sustained increase of basal tone but did not block initial dopaminergic contraction and partially inhibited bronchodilator effect of dopamine. Dopaminergic relaxation in rat trachea is mediated by DA1 rather than by DA2 receptors; and adrenergic receptors are not involved in such dopamine-induced response. Finally, DA1 antagonist SCH23390 exerts intrinsic contractile activity on airway smooth muscle that deserves further research.

  15. Paediatric dose display

    International Nuclear Information System (INIS)

    Griffin, D.W.; Derges, S.; Hesslewood, S.

    1984-01-01

    A compact, inexpensive unit, based on an 8085 microprocessor, has been designed for calculating doses of intravenous radioactive injections for children. It has been used successfully for over a year. The dose is calculated from the body surface area and the result displayed in MBq. The operator can obtain the required dose on a twelve character alphanumeric display by entering the age of the patient and the adult dose using a hexadecimal keyboard. Circuit description, memory map and input/output, and firmware are dealt with. (U.K.)

  16. An environmental dose experiment

    Science.gov (United States)

    Peralta, Luis

    2017-11-01

    Several radiation sources worldwide contribute to the delivered dose to the human population. This radiation also acts as a natural background when detecting radiation, for instance from radioactive sources. In this work a medium-sized plastic scintillation detector is used to evaluate the dose delivered by natural radiation sources. Calibration of the detector involved the use of radioactive sources and Monte Carlo simulation of the energy deposition per disintegration. A measurement of the annual dose due to background radiation to the body was then estimated. A dose value compatible with the value reported by the United Nations Scientific Committee on the Effects of Atomic Radiation was obtained.

  17. An environmental dose experiment

    International Nuclear Information System (INIS)

    Peralta, Luis

    2017-01-01

    Several radiation sources worldwide contribute to the delivered dose to the human population. This radiation also acts as a natural background when detecting radiation, for instance from radioactive sources. In this work a medium-sized plastic scintillation detector is used to evaluate the dose delivered by natural radiation sources. Calibration of the detector involved the use of radioactive sources and Monte Carlo simulation of the energy deposition per disintegration. A measurement of the annual dose due to background radiation to the body was then estimated. A dose value compatible with the value reported by the United Nations Scientific Committee on the Effects of Atomic Radiation was obtained. (paper)

  18. Doses from portable gauges

    International Nuclear Information System (INIS)

    Linauskas, S.H.

    1988-08-01

    Field studies to measure actual radiation exposures of operators of commercial moisture-density gauges were undertaken in several regions of Canada. Newly developed bubble detector dosimeter technology and conventional dosimetry such as thermoluminescent dosimeters (TLDs), integrating electronic dosimeters (DRDs), and CR-39 neutron track-etch detectors were used to estimate the doses received by 23 moisture-density gauge operators and maintenance staff. These radiation dose estimates were supported by mapping radiation fields and accounting for the time an operator was near a gauge. Major findings indicate that gauge maintenance and servicing workers were more likely than gauge operators to receive exposures above the level of 5 mSv, and that neutron doses were roughly the same as gamma doses. Gauge operators receive approximately 75% of their dose when transporting and carrying the gauge. Dose to their hands is similar to the dose to their trunks, but the dose to their feet area is 6 to 30 times higher. Gamma radiation is the primary source of radiation contributing to operator dose

  19. Radiation dose in vertebroplasty

    International Nuclear Information System (INIS)

    Mehdizade, A.; Lovblad, K.O.; Wilhelm, K.E.; Somon, T.; Wetzel, S.G.; Kelekis, A.D.; Yilmaz, H.; Abdo, G.; Martin, J.B.; Viera, J.M.; Ruefenacht, D.A.

    2004-01-01

    We wished to measure the absorbed radiation dose during fluoroscopically controlled vertebroplasty and to assess the possibility of deterministic radiation effects to the operator. The dose was measured in 11 consecutive procedures using thermoluminescent ring dosimeters on the hand of the operator and electronic dosimeters inside and outside of the operator's lead apron. We found doses of 0.022-3.256 mGy outside and 0.01-0.47 mGy inside the lead apron. Doses on the hand were higher, 0.5-8.5 mGy. This preliminary study indicates greater exposure to the operator's hands than expected from traditional apron measurements. (orig.)

  20. High dose rate endobronchial brachytherapy - treatment technique

    International Nuclear Information System (INIS)

    Carvalho, Heloisa de Andrade; Aisen, Salim; Haddad, Cecilia Maria Kalil; Nadalin, Wladimir; Pedreira Junior, Wilson Leite; Chavantes, Maria Cristina

    1998-01-01

    High dose rate endobronchial brachytherapy is efficient in symptom relief due to obstructive endobronchial malignancies. However, it's role in survival improvement for patients with lung cancer is not yet established. The use of this treatment in increasing, specially in the developing countries. The purpose of this paper is to present the treatment technique used in the Radiotherapy Department of the Hospital da Clinicas, University of Sao Paulo, based on an experience of 60 cases treated with 180 procedures. Some practical suggestions and rules adopted in the Department are described. The severe complications rate is 6.7%, demonstrating an adequate patient selection associated with the technique utilized. (author)

  1. As dobras da imagem

    Directory of Open Access Journals (Sweden)

    Profª. Drª. Fátima Antunes da Silva (Yaska Antunes

    2009-05-01

    Full Text Available O presente trabalho tem por objetivo tentar compreender a produção da imagem visual no teatro. Para isso se vale da apropriação livre do conceito de “dobra? de Gilles Deleuze para se referir à multiplicidade de imagens criadas pelas diversas modalidades artísticas. Como no teatro há o entrelaçamento de imagens verbais – palavras enunciadas pelo texto dramático ou teatral – com imagens visuais – a visualidade advinda da composição cênica concreta que organiza no espaço ator e objeto –, a ênfase só podia recair sobre estas duas formas imagéticas. No caso do teatro, surge ainda a percepção de que para além da materialidade da cena, outras imagens emergem do confronto entre palco e platéia. Nesse sentido, imagem teatral seria então aquilo que surge da interação entre ator e espectador. A contribuição desse trabalho pode estar no fato de atualizar certos conceitos sobre a criação da imagem poética na poesia e no cinema para aplicá-los ao teatro. Ao recuperar o pensa-mento de Otávio Paz, Alfredo Bosi, Sergei Eisenstein, entre outros, bus-ca-se promover uma reflexão mais aprofundada sobre a construção visual no teatro.

  2. Uso da técnica da radiohormese para aumento no desenvolvimento de plantas de alho

    Directory of Open Access Journals (Sweden)

    Lúcia Cristina Aparecida Santos Silva

    2014-05-01

    Full Text Available O alho tem se destacado não só como uma das principais fontes de temperos dentro da gastronomia, como também um importante vetor de estudo agronômico tanto pela sua peculiar característica de cultivo como pela aplicação das propriedades na quebra de dormência em cultivares como maçã e pera. Este trabalho teve como objetivo aplicar a técnica da radiohormese em bulbos de alho para avaliação do potencial desenvolvimento de suas mudas. Foi desenvolvido no laboratório de Radiobiologia e Ambiente – CENA/USP, utilizando bulbos de alho obtidos no comércio local que, após prévia seleção, foram submetidos aos tratamentos pela radiação gama, nas doses 0 (controle 15, 50, 75 e 100kGy numa taxa de dose de 0,456Gy/h. De acordo com os resultados obtidos pode-se observar que as doses utilizadas influenciaram negativamente a germinação das plantas de alho, devendo portanto que sejam realizados novos testes afim de que se obtenha a dose adequada para este fim.

  3. Candidose úlcero-vegetante da perna

    Directory of Open Access Journals (Sweden)

    Luis Carlos Cucé

    1986-10-01

    Full Text Available Os Autores apresentam caso de paciente portadora de lesão única, úlcero-vegetante, localizada no 1/3 inferior da perna direita, causada pela Candida albicans. Submetida à terapêutica com Ketoconazol na dose de 400 mg diários durante o primeiro mês de tratamento e 200 mg diários no segundo mês, evoluiu para cura, sem recidiva e com negativação do título de anticorpos anti Candida albicans (fixação do complemento.

  4. Effective dose equivalent

    International Nuclear Information System (INIS)

    Huyskens, C.J.; Passchier, W.F.

    1988-01-01

    The effective dose equivalent is a quantity which is used in the daily practice of radiation protection as well as in the radiation hygienic rules as measure for the health risks. In this contribution it is worked out upon which assumptions this quantity is based and in which cases the effective dose equivalent can be used more or less well. (H.W.)

  5. Doses from radiation exposure

    International Nuclear Information System (INIS)

    Menzel, H-G.; Harrison, J.D.

    2012-01-01

    Practical implementation of the International Commission on Radiological Protection’s (ICRP) system of protection requires the availability of appropriate methods and data. The work of Committee 2 is concerned with the development of reference data and methods for the assessment of internal and external radiation exposure of workers and members of the public. This involves the development of reference biokinetic and dosimetric models, reference anatomical models of the human body, and reference anatomical and physiological data. Following ICRP’s 2007 Recommendations, Committee 2 has focused on the provision of new reference dose coefficients for external and internal exposure. As well as specifying changes to the radiation and tissue weighting factors used in the calculation of protection quantities, the 2007 Recommendations introduced the use of reference anatomical phantoms based on medical imaging data, requiring explicit sex averaging of male and female organ-equivalent doses in the calculation of effective dose. In preparation for the calculation of new dose coefficients, Committee 2 and its task groups have provided updated nuclear decay data (ICRP Publication 107) and adult reference computational phantoms (ICRP Publication 110). New dose coefficients for external exposures of workers are complete (ICRP Publication 116), and work is in progress on a series of reports on internal dose coefficients to workers from inhaled and ingested radionuclides. Reference phantoms for children will also be provided and used in the calculation of dose coefficients for public exposures. Committee 2 also has task groups on exposures to radiation in space and on the use of effective dose.

  6. Gonad dose in cineurethrocystography

    International Nuclear Information System (INIS)

    Ardran, G.M.; Dixon-Brown, A.; Fursdon, P.S.

    1978-01-01

    The technical factors used for cineurethrocystography for the true lateral projection in females are given. The mid-line radiation dose has been measured with LiF TLD inserted into the vagina in 19 examinations. The average dose recorded was 148 mrad, the range being 50 to 306 mrad, the average number of cine frames exposed was 96. Data obtained using a Rando phantom indicated that the average ovary dose would be 30% greater than the mid-line dose since the near ovary receives a higher dose than the more distant one. The technique used for men is also given, the average gonad dose in six men being 123 mrad, range 56 to 243 mrad when simple lead foil gonad protection was used; the average number of cine frames was 107. The dose in one man without gonad protection was 1575 mrad for 112 cine frames. The results for both sexes compare favourably with those of others reported in the literature and with gonad doses recorded in typical IVP examinations. (author)

  7. Internal dose estimates

    International Nuclear Information System (INIS)

    Wrenn, M.E.

    1977-01-01

    Internal doses, the procedures for making them and their significance has been reviewed. Effects of uranium, radium, lead-210, polonium-210, thorium in man are analysed based on data from tables and plots. Dosimetry of some ingested nuclides and inhalation dose due to radon-222, radon-220 and their daugther products are discussed [pt

  8. Qualidade da produção da bananeira Nanicão em função do uso de biofertilizantes

    Directory of Open Access Journals (Sweden)

    José G. R. dos Santos

    2014-04-01

    Full Text Available Com esta pesquisa objetivou-se estudar os efeitos de 5 doses de 4 diferentes tipos de biofertilizante na produção da bananeira Nanicão, em 3 ciclos sucessivos. O experimento foi conduzido em condições de campo, na Escola Agrotécnica do Cajueiro, no município de Catolé do Rocha, estado da Paraíba, Brasil. O solo da área é classificado como Neossolo Flúvico, com textura franco arenosa. O experimento foi conduzido entre os meses de junho de 2008 a junho de 2011. O delineamento experimental adotado foi o de blocos casualizados com 20 tratamentos no esquema fatorial 5x4 (doses x tipos de biofertilizantes, com quatro repetições. Os resultados mostram que os tipos de biofertilizante não afetaram as variáveis de qualidade da produção; o comprimento e o diâmetro do fruto aumentaram com o incremento da dose de biofertilizante até limites ótimos; o comprimento do fruto das plantas do segundo ciclo foi superior ao das plantas dos primeiro e terceiro ciclos; o diâmetro do fruto das plantas do segundo ciclo foi superior ao das plantas dos primeiro e terceiro ciclos e os valores de ºBrix e de pH da polpa do fruto não foram afetados pelas doses de biofertilizante aplicadas.

  9. Trauma da Veia Porta

    Directory of Open Access Journals (Sweden)

    Gustavo Pereira Fraga

    Full Text Available OBJETIVO: O trauma da veia porta é raro e freqüentemente fatal por causa de exsanguinação e alta incidência de lesões de estruturas adjacentes. Devido às pecualiaridades desta lesão e diferentes condutas propostas na literatura, o objetivo dos autores é relatar a experiência neste tipo de lesão. MÉTODO: Estudo retrospectivo, de janeiro de 1994 e dezembro de 2001, de 1370 pacientes submetidos à laparotomia devido trauma abdominal. Entre esses, 15 pacientes apresentavam lesão da veia porta. As lesões foram classificadas conforme a sua extensão e localização. RESULTADOS: O mecanismo de trauma predominante foi o penetrante. O diagnóstico da lesão foi realizado no intraoperatório. Os procedimentos executados foram: sutura, anastomose término-terminal e ligadura da veia porta. A mortalidade foi de 53,3%. CONCLUSÃO: A lesão da veia porta possui alta taxa de mortalidade e o atendimento adequado está diretamente relacionado à sobrevida.

  10. Effect of DA-9701 on colorectal distension-induced visceral hypersensitivity in a rat model.

    Science.gov (United States)

    Kim, Eun Ran; Min, Byung-Hoon; Lee, Tae Ho; Son, Miwon; Rhee, Poong-Lyul

    2014-07-01

    DA-9701 is a newly developed drug made from the vegetal extracts of Pharbitidis semen and Co-rydalis tuber. The aim of this study was to evaluate the effect of DA-9701 on colorectal distension (CRD)-induced visceral hypersensitivity in a rat model. Male Sprague-Dawley rats were subjected to neonatal colon irritation (CI) using CRD at 1 week after birth (CI group). At 6 weeks after birth, CRD was applied to these rats with a pressure of 20 to 90 mm Hg, and changes in the mean arterial pressure (MAP) were measured at baseline (i.e., without any drug administration) and after the administration of different doses of DA-9701. In the absence of DA-9701, the MAP changes after CRD were significantly higher in the CI group than in the control group at all applied pressures. In the control group, MAP changes after CRD were not significantly affected by the administration of DA-9701. In the CI group, however, the administration of DA-9701 resulted in a significant decrease in MAP changes after CRD. The administration of DA-9701 at a dose of 1.0 mg/kg produced a more significant decrease in MAP changes than the 0.3 mg/kg dose. The administration of DA-9701 resulted in a significant increase in pain threshold in rats with CRD-induced visceral hypersensitivity.

  11. Occupational dose constraint

    International Nuclear Information System (INIS)

    Heilbron Filho, Paulo Fernando Lavalle; Xavier, Ana Maria

    2005-01-01

    The revision process of the international radiological protection regulations has resulted in the adoption of new concepts, such as practice, intervention, avoidable and restriction of dose (dose constraint). The latter deserving of special mention since it may involve reducing a priori of the dose limits established both for the public and to individuals occupationally exposed, values that can be further reduced, depending on the application of the principle of optimization. This article aims to present, with clarity, from the criteria adopted to define dose constraint values to the public, a methodology to establish the dose constraint values for occupationally exposed individuals, as well as an example of the application of this methodology to the practice of industrial radiography

  12. Determination of migration speed and the partition ratios of {sup 137} Cs in the soils of the future waste repository in Abadia de Goias, GO, Brazil; Determinacao da velocidade de migracao e das razoes de particao de {sup 137} Cs em solos da regiao do futuro repositorio de rejeitos de Abadia de Goias, GO

    Energy Technology Data Exchange (ETDEWEB)

    Pereira, Jose Carlos Alves

    1996-07-01

    The dispersion of a 51 TBq {sup 137} Cs source to the environment in Goiania city, has originated approximately 3500 m{sup 3} of radioactive waste. In order to segregate such waste in a definite form, a repository is being built in Abadia de Goias, GO near the site where it has been temporarily stored. This study had the following objectives: the determination of the {sup 137} Cs partition rate (K{sub D}) and the estimate of its migration velocity in soil samples from the site where the repository is being built. The determination of {sup 137} Cs K{sub D} was carried out by using two methods: 'batch method' and 'in-situ' method. In relation to the 'batch method'; 6 soil profiles cut into sections according to its pedologic horizons and 13 surface soil samples were collected, whereas for the 'in-situ' method 6 soil profiles with 28 cm depth were collected and each profile has been cut into 14 soil sections of a 1-3 cm range. Studies were carried out by using the 'batch method' to relate the influence from v/m and from shaking in K{sub D} determination and also studies about {sup 137} Cs adsorption reversibility in soil, time necessary for the equilibrium of {sup 137} Cs between water/soil phases to be reached and K{sub D} correlation with pedological parameters (pH values in water and clay, silt and organic material percent concentration, electrical conductivity of solution and the cation exchange - Ca{sup +2}, Mg {sup +2}, K{sup +2}, Na{sup +}, Al{sup +3}, H{sup +}). It has been noticed that in work conditions, K{sub D} has increased according to the rate increase v/m and the use of agitation in water/soil phases had no influence in K{sub D} determination. The absorbed {sup 137} Cs desorption process by water has shown to be slow but continued. Nevertheless, {sup 137} Cs cationic exchange for NH{sub 4}{sup +} has presented two steps: the first one very fast where approximately 50% of {sup 137} Cs adsorbed has been exchanged for NH{sub 4}{sup +} ions in just two days and the second one slow. Results indicate that {sup 137} Cs adsorption process in this kind of soil may be considered reversible. In using the 'batch method', it was noticed a higher {sup 137} Cs when increasing depth from soil profiles (108 - 897 cm{sup 3}.g{sup -1}). Nevertheless, {sup 137} Cs K{sub D} results point out to an average value of 430cm{sup 3}.g{sup -1}. This observation is confirmed when comparing to an average K{sub D} obtained by using 'batch method' and the K{sub D} value of 501 cm{sup 3}.g{sup -1} obtained by using 'in-situ' method. K{sub D} has just presented consistent linear correlation in relation to clay, [r=0,73]. Even though the type of clay found in the analyzed soils (caulinita) possess low adsorptive capacity, results have shown that as long as higher concentrations in clay in soil layers have been found, {sup 137} Cs K{sub D} has proportionally increased. Taking into consideration the hydrogeological medium conditions, {sup 137} Cs migration velocity found for a K{sub D} the average value obtained by using 'batch method' is 0,43 cm.year{sup -1}, whereas, for the 'in-situ' method was 0,37 cm.year{sup -1}. Assuming two meters as the minimum depth for ground water, {sup 137} Cs would take 460 - 500 years to reach it. (author)

  13. Determination of strontium isotopic composition in natural waters: examples of application in subsurface waters of the coastal zone of Bragantina region, Para, BR; Determinacao da composicao isotopica de estroncio em aguas naturais: exemplos de sua aplicacao em aguas subsuperficiais da zona costeira na regiao Bragantina-PA

    Energy Technology Data Exchange (ETDEWEB)

    Bordalo, Adriana Oliveira; Moura, Candido Augusto Veloso; Scheller, Thomas [Universidade Federal do Para (UFPA), Belem, PA (Brazil). Centro de Geociencias]. E-mail: adriana@ufpa.br

    2007-07-15

    Analytical procedures used for determining the concentrations and isotope composition of strontium in subsurface waters, by mass spectrometry, are described. Sampling was performed in coastal plateaus, salt marsh and mangrove environments in the coastal region of Para. Coastal plateau waters have {delta}{sup 87}Sr between 1.51 and 6.26 per mille and Sr concentration bellow 58 ppb. Salt marsh waters show {delta}{sup 87}Sr between 0.55 and 0.90 per mille and Sr concentration between 93 and 114 ppm, while mangrove waters have {delta}{sup 87}Sr per mille around zero and Sr concentration above 15 ppm. Differences in the {sup 87}Sr/{sup 86}Sr ratio in these subsurface waters are detected, as well as seasonal variations in the coastal plateau waters. (author)

  14. Contribution to the study of the determination of the remaining flow in deviation SHP (Small-Scale Hydroelectric Power Plants): the incorporation of the economic value of environmental resources; Contribuicao ao estudo da determinacao da vazao remanescente em PCHS (Pequenas Centrais Hidreletricas) de desvio: a incorporacao do valor economico de recursos ambientais

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Henrique Machado Moreira [Schlumberger, Itajuba, MG (Brazil)], e-mail: henriquemmsantos@yahoo.com.br; Santos, Afonso Henriques Moreira [Universidade Federal de Itajuba (UNIFEI/GEE/ISSE), MG (Brazil). Inst. de Sistemas Eletricos e Energia. Grupo de Estudos Energeticos], e-mail: afonsohms@gmail.com; Ribeiro Junior, Leopoldo Uberto, e-mail: leopoldo_junior@yahoo.com.br; Nascimento, Jose Guilherme Antloga do, e-mail: jgan@brasilpch.com.br

    2008-07-01

    This paper seems to develop the economic analysis of Small Hydro Plants - SHP, incorporating in this analysis evaluations of priceless losses for the society, as the environmental damages, taking SHP Paraitinga as the study case. It involves questions related to environmental valuation, economics, and engineering, presenting the concept of the Economic Valuation of Environmental Resources. The main valuation methods are presented. In the economic analysis, the concept of willingness to pay is verified by using demand function, that involves the elasticity and the price. The price is calculated based on costs and the elasticity is calculated based on the essentially of the goods or services, which could be reached by market observation. Only the remaining outflow definition, in the stretch of reduced outflow of the project will be studied. After these studies and valuations, some scenarios will be adopted for the developed model, on current values and projections. A comparison of the present work and the methodology of commitment programming are carried out. Finally the results will be analyzed, trying to get the 'optimum outflow', aiming at balancing power, tourism and environmental interests. (author)

  15. Validation of the extension of the range of application and of the single system of injection for the determination of total nitrogen in petroleum and its derivatives by chemiluminescence; Validacao da ampliacao da faixa de aplicacao e do sistema unico de injecao para a determinacao de nitrogenio total em petroleos e derivados por quimiluminescencia

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Maria de Fatima Pereira dos [Fundacao Gorceix, Ouro Preto, MG(Brazil)]. E-mail: santos@cenpes.petrobras.com.br; Tamanqueira, Juliana Boechat [Universidade Federal Fluminense, Niteroi, RJ (Brazil); Magalhaes, Julio Cesar Dias [PETROBRAS, Rio de Janeiro, RJ (Brazil). Centro de Pesquisas. Avaliacao de Petroleo; Oliveira, Elcio Cruz de [Transpetro, Rio de Janeiro, RJ (Brazil). Logistica e Planejamento; Vaitsman, Delmo Santiago [Universidade Federal, Rio de Janeiro, RJ (Brazil). Inst. de Quimica. Dept. de Quimica Analitica

    2003-12-01

    With the objectives of using a single system of injection and of extending the range of application for the method ASTM D4629/02 'Total Nitrogen in Petroleum Derivatives by the System of Injection with a Syringe and Detection by Chemo- Luminescence', it was studied a procedure by statistical validation with the objective of guaranteeing the analytical reliability of the assay and allowing the inclusion of samples of petroleum and heavy derivatives in one single methodology. The determination of total nitrogen for petroleum and derivatives is traditionally assayed using the method of Kjeldahl - a time-consuming methodology that requires a large amount of time for giving the final result, at the same time that is not recommended for concentrations below 0.1%w/w, which does not meet the requirements for the specifications of the product, in the petroleum industry. An alternative for the method of Kjeldahl is the pyro-chemo luminescence, which allows the achievement of more repetitive results for total nitrogen. In the detection of nitrogen, the technique combines the reliability of oxidative combustion with the sensitivity of chemiluminescence. Therefore, it was developed a protocol of validation in the methodology ASTM D4629/02 for the validation of the extension of the range of application and for the evaluation of the performance of the equipment in analytical conditions, according to the calibration curve. (author)

  16. X-ray cone beam microtomography for quantitative assessment of tracheal and pharyngeal volumes of Rhodnius prolixus; Utilizacao da microtomografia computadorizada com feixe de raios-X conico para a determinacao quantitativa do volume da traqueia e faringe do Rhodnius prolixus

    Energy Technology Data Exchange (ETDEWEB)

    Souza, Izabella Soares de

    2017-07-01

    In the past decade microcomputerized tomography imaging using synchrotron radiation has become a powerful technique to generate high resolution images of Rhodinus prolixus. Images of soft tissues (protocerebrum and muscles) and dense structures (pharynx, trachea and esophagus) of R. prolixus head have been obtained using synchrotron radiation microtomography in mono and polychromatic configuration, respectively. Advancements in conventional microtomography have increased the achievable resolution and contrast, making this relatively inexpensive and widely available technology potentially useful for studies of insect internal morphology. The main goal of this work was to provide a new set of high quality microtomographic images of R. prolixus achieved by means of a desktop X-ray microtomograph. It allows the three-dimensional visualization of important chitinized structures: pharynx and tracheae. Pharyngeal and tracheal volumes were quantitatively evaluated at different days (1, 4, 10, 15 and 20) after feeding. The results suggest that variation of average volumes could be attributed to insect hormone 20-hydroxy-ecdysone (20-OH-Ec) pulse at 11 days after feeding. Pharyngeal volumes decrease 3.80 times. On the other hand, tracheal volumes increase 1.78 times. Head total volume showed similar trends than trachea. (author)

  17. Dose response relationship at low doses

    International Nuclear Information System (INIS)

    Schull, W.J.

    1992-01-01

    The data that have accrued in Hiroshima and Nagasaki on the effects of ionizing radiation on the developing human brain are reviewed. Effects considered are severe mental retardation, lowered IQ scores, decline in school performance, seizures, other neuropsychological effects, and small head size. All these factors may be related to radiation doses received by the mother during pregnancy. (L.L.) 3 figs., tab., 7 refs

  18. Da Vinci Linjen

    DEFF Research Database (Denmark)

    Nissen, Poul

    Afsluttende evalueringsrapport fra følgeforskningen gennem tre år i forbindelse med dety pædagogiske arbejde på Blåbjerggårdskolens Da Vinci Linje for skolemotiverede og underpræsterende elever på 7. til 9. klassetrin.......Afsluttende evalueringsrapport fra følgeforskningen gennem tre år i forbindelse med dety pædagogiske arbejde på Blåbjerggårdskolens Da Vinci Linje for skolemotiverede og underpræsterende elever på 7. til 9. klassetrin....

  19. Synchronized dynamic dose reconstruction

    International Nuclear Information System (INIS)

    Litzenberg, Dale W.; Hadley, Scott W.; Tyagi, Neelam; Balter, James M.; Ten Haken, Randall K.; Chetty, Indrin J.

    2007-01-01

    Variations in target volume position between and during treatment fractions can lead to measurable differences in the dose distribution delivered to each patient. Current methods to estimate the ongoing cumulative delivered dose distribution make idealized assumptions about individual patient motion based on average motions observed in a population of patients. In the delivery of intensity modulated radiation therapy (IMRT) with a multi-leaf collimator (MLC), errors are introduced in both the implementation and delivery processes. In addition, target motion and MLC motion can lead to dosimetric errors from interplay effects. All of these effects may be of clinical importance. Here we present a method to compute delivered dose distributions for each treatment beam and fraction, which explicitly incorporates synchronized real-time patient motion data and real-time fluence and machine configuration data. This synchronized dynamic dose reconstruction method properly accounts for the two primary classes of errors that arise from delivering IMRT with an MLC: (a) Interplay errors between target volume motion and MLC motion, and (b) Implementation errors, such as dropped segments, dose over/under shoot, faulty leaf motors, tongue-and-groove effect, rounded leaf ends, and communications delays. These reconstructed dose fractions can then be combined to produce high-quality determinations of the dose distribution actually received to date, from which individualized adaptive treatment strategies can be determined

  20. Profilaxia da peste

    Directory of Open Access Journals (Sweden)

    Renato dos Santos Araújo

    1967-12-01

    Full Text Available O autor parte da premissa de que a profilaxia da doença infecciosa decorre do encadeamento epidemiológico: fonte de infecção-veículo transmissor - receptivel, para explicar a da peste, baseada no mesmo princípio. Depois de citar os 4 principais complexos epidemiológicos da peste e afirmar que tôda a profilaxia da doença consiste em atingir os dois primeiros elos dessas cadeias e proteger o último, passa a classificar os vários métodos profiláticos empregados em 2 grandes grupos: o das medidas destrutivas ou provisórias e o das medidas supressivas ou definitivas. Entre as primeiras arrola a desratização e a despulização, às quais acrescenta o tratamento e isolamento do doente e do portaãor, e entre as segundas inclui a anti-ratização e a imunização. A seguir, passa a explicar em que consistem essas várias medidas profiláticas e quais os agentes de que se tem lançado mão para executá-las, expendendo ao curso dessa exposição o conceito que formula a respeito de cada uma delas, à guisa de apreciação do seu valor relativo. Enaltece sobretudo as medidas supressivas ou definitivas, às quais empresta a maior significação na luta antipestosa, chamando a atenção, em especial, para a necessidade de estudos imunológicos para aperfeiçoamento do poder imunitário das vacinas de germes vivos avirulentos, que considera um grande recurso para a profilaxia da doença, sobretudo para a proteção do rurícola, cujo labor e modo de vida o expõem inevitavelmente a se infectar, por ocasião da ocorrência de epizootias de origem silvestre. Concluída essa primeira parte, passa a fazer o histórico de como se desenvolveu a campanha contra a peste, no Brasil, desde a época da sua invasão em 1899 pelo pôrto de Santos até os nossos dias. Nesse histórico, detem-se um pouco para expôr a atuação do extinto Serviço Nacional de Peste, o qual, criado em 1941, após a reorganização do Departamento Nacional de Saúde, passou

  1. Low doses effects

    International Nuclear Information System (INIS)

    Tubiana, M.

    1997-01-01

    In this article is asked the question about a possible carcinogens effect of low dose irradiation. With epidemiological data, knowledge about the carcinogenesis, the professor Tubiana explains that in spite of experiments made on thousand or hundred of thousands animals it has not been possible to bring to the fore a carcinogens effect for low doses and then it is not reasonable to believe and let the population believe that low dose irradiation could lead to an increase of neoplasms and from this point of view any hardening of radiation protection standards could in fact, increase anguish about ionizing radiations. (N.C.)

  2. Determination of alpha-Tocopherol (vitamin E) in irradiated garlic by high performance liquid chromatography (HPLC); Determinacao de alpha-tocoferol em alho irradiado utilizando cromatografia liquida de alta frequencia (CLAE)

    Energy Technology Data Exchange (ETDEWEB)

    Rios, Magda Dias Goncalves; Penteado, Marilene de Vuono Camargo [Sao Paulo Univ., SP (Brazil). Faculdade de Ciencias Farmaceuticas. Dept. de Alimentos e Nutricao Experimental]. E-mail: riosmagda@hotmail.com

    2003-02-01

    The effects of {sup 60}Co ionizing radiations in doses of 0, 75, 100, 150, 200 and 250Gy on garlic, upon the {alpha}-tocopherol concentration were studied. The {alpha}-tocopherol contents were established by high performance liquid chromatography (HPLC), after direct hexane extraction from the garlic samples. The {alpha}-tocopherol was determined through normal phase column, and mobile phase was composed by hexane: iso-propyl alcohol (99:01 v/v), with 2mL/min flow rate and fluorescence detector. It is statistically shown that an irradiation dose of up to 150 Gy does not affect the garlic {alpha}-tocopherol content. (author)

  3. Crescimento vegetativo da bananeira Nanica em dois ciclos sucessivos em função da aplicação de biofertilizantes líquidos

    Directory of Open Access Journals (Sweden)

    Aldair Souza Medeiros

    2014-06-01

    Full Text Available Objetivou-se com essa pesquisa estudar os efeitos de biofertilizantes no crescimento vegetativo da bananeira Nanica, em dois ciclos sucessivos, no semiárido paraibano.O experimento foi conduzido, em condições de campo, no Campus IV, da Universidade Estadual da Paraíba. O solo da área experimental é classificado como Neossolo Flúvico de textura arenosa não apresentando problemas de acidez e alcalinidade. O delineamento experimental adotado foi o de blocos casualizados, com 50 tratamentos, no esquema fatorial 5 x 10, com quatro repetições, totalizando 200 parcelas experimentais (1 planta ou touceira/parcela. Os resultados obtidos na pesquisa mostram que o crescimento da bananeira Nanica (1° ciclo não foi afetado pelos tipos de biofertilizantes aplicados; os valores de diâmetro do pseudocaule, área foliar unitária e área folia da planta da bananeira Nanica (1° ciclo aumentaram com o incremento das doses de biofertilizante até os limites ótimos de 1,56; 1,63; e 1,54 L/aplicação, respectivamente, proporcionando valores ótimos dessas variáveis, havendo reduções a partir desses patamares; o crescimento da bananeira Nanica (2° ciclo não foi afetado pelas doses de biofertilizantes aplicados; o biofertilizante B5, que contém o maior número de ingredientes na sua composição, se sobressaiu, de forma significativa, sobre os demais tipos, proporcionando maiores altura da planta e área foliar da planta da bananeira Nanica (2° ciclo.

  4. Doses from radioactive methane

    International Nuclear Information System (INIS)

    Phipps, A.W.; Kendall, G.M.; Fell, T.P.; Harrison, J.D.

    1990-01-01

    A possible radiation hazard arises from exposure to methane labelled with either a 3 H or a 14 C nuclide. This radioactive methane could be released from a variety of sources, e.g. land burial sites containing radioactive waste. Standard assumptions adopted for vapours would not apply to an inert alkane like methane. This paper discusses mechanisms by which radioactive methane would irradiate tissues and provides estimates of doses. Data on skin thickness and metabolism of methane are discussed with reference to these mechanisms. It is found that doses are dominated by dose from the small fraction of methane which is inhaled and metabolised. This component of dose has been calculated under rather conservative assumptions. (author)

  5. Controllable dose; Dosis controlable

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez R, J T; Anaya M, R A [ININ, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    2004-07-01

    With the purpose of eliminating the controversy about the lineal hypothesis without threshold which found the systems of dose limitation of the recommendations of ICRP 26 and 60, at the end of last decade R. Clarke president of the ICRP proposed the concept of Controllable Dose: as the dose or dose sum that an individual receives from a particular source which can be reasonably controllable by means of any means; said concept proposes a change in the philosophy of the radiological protection of its concern by social approaches to an individual focus. In this work a panorama of the foundations is presented, convenient and inconveniences that this proposal has loosened in the international community of the radiological protection, with the purpose of to familiarize to our Mexican community in radiological protection with these new concepts. (Author)

  6. Acetaminophen dosing for children

    Science.gov (United States)

    ... your child, call your provider. Proper Dosing of Suppositories If your child is vomiting or will not take oral medicine, you can use suppositories. Suppositories are placed in the anus to deliver ...

  7. Radiation dose electrophysiology procedures

    International Nuclear Information System (INIS)

    Hernandez-Armas, J.; Rodriguez, A.; Catalan, A.; Hernandez Armas, O.; Luque Japon, L.; Moral, S.; Barroso, L.; Rfuez-Hdez, R.

    2006-01-01

    The aim of this paper has been to measure and analyse some of the parameters which are directly related with the doses given to patients in two electrophysiology procedures: diagnosis and ablation with radiofrequency. 16 patients were considered in this study. 13 them had an ablation with radiofrequency at the Unit of Electrophysiology at the University Hospital of the Canaries, La Laguna., Tenerife. The results of skin doses, in the ablation cases, were higher than 2 Gy (threshold of some deterministic effects). The average value was 1.1 Gy. The personal doses, measured under the lead apron, for physician and nurses were 4 and 3 micro Sievert. These results emphasised the necessity of radiation protection measures in order to reduce, ad much as possible, the doses to patients. (Author)

  8. Dose in conventional radiography

    International Nuclear Information System (INIS)

    Acuna D, E.; Padilla R, Z. P.; Escareno J, E.; Vega C, H. R.

    2011-10-01

    It has been pointed out that medical exposures are the most significant sources of exposure to ionizing radiation for the general population. Inside the medical exposures the most important is the X-ray use for diagnosis, which is by far the largest contribution to the average dose received by the population. From all studies performed in radiology the chest radiography is the most abundant. In an X-ray machine, voltage and current are combined to obtain a good image and a reduce dose, however due to the workload in a radiology service individual dose is not monitored. In order to evaluate the dose due to chest radiography in this work a plate phantom was built according to the ISO recommendations using methylmethacrylate walls and water. The phantom was used in the Imaging department of the Zacatecas General Hospital as a radiology patient asking for a chest study; using thermoluminescent dosimeters, TLD 100 the kerma at the surface entrance was determined. (Author)

  9. Maximum permissible dose

    International Nuclear Information System (INIS)

    Anon.

    1979-01-01

    This chapter presents a historic overview of the establishment of radiation guidelines by various national and international agencies. The use of maximum permissible dose and maximum permissible body burden limits to derive working standards is discussed

  10. Irradiation dose of cosmonauts

    International Nuclear Information System (INIS)

    Makra, Zs.

    1978-01-01

    The results obtained by determining the irradiation dose during the spaceflights of Apollo as well as the Sojouz-3 and Sojouz-9 spacecrafts have been compared in the form of tables. In case of Apollo astronauts the irradiation dose was determined by two methods and its sources were also pointed out, in tables. During Sojouz spacetravels the cosmonauts were exposed to a negligible dose. In spite of this fact the radiation danger is considerable. The small irradiation doses noticed so far are due to the fact that during the spaceflights there was no big proturberance. However, during the future long-range spacetravels a better radiation shielding than the one used up to now will be necessary. (P.J.)

  11. Ibuprofen dosing for children

    Science.gov (United States)

    ... this page: //medlineplus.gov/ency/patientinstructions/000772.htm Ibuprofen dosing for children To use the sharing features ... much of this medicine can be harmful. How Ibuprofen can Help Your Child Ibuprofen is a type ...

  12. Effects of low doses

    International Nuclear Information System (INIS)

    Le Guen, B.

    2001-01-01

    Actually, even though it is comfortable for the risk management, the hypothesis of the dose-effect relationship linearity is not confirmed for any model. In particular, in the area of low dose rate delivered by low let emitters. this hypothesis is debated at the light of recent observations, notably these ones relative to the mechanisms leading to genetic instability and induction eventuality of DNA repair. The problem of strong let emitters is still to solve. (N.C.)

  13. Gonadal doses from radiotherapy

    International Nuclear Information System (INIS)

    Solomon, S.B.; Morris, N.D.

    1980-06-01

    The method of calculation of gonadal doses arising from different radiotherapeutic procedures is described. The measurement of scatter factors to the gonads from superficial and deep therapy is detailed and the analytic fits to the experimental data, as a function of field position, field size and beam energy are given. The data used to calculate the gonadal doses from treatments using linear accelerators, teletherapy and sealed sources are described and the analytic fits to the data given

  14. Avaliação da escória de siderurgia e de calcários como corretivos da acidez do solo no cultivo da alface

    Directory of Open Access Journals (Sweden)

    Prado Renato de Mello

    2002-01-01

    Full Text Available O presente trabalho objetivou avaliar os efeitos da escória de siderurgia e dos calcários magnesiano e dolomítico, na produção de matéria seca da alface (Lactuca sativa L. e as alterações na sua nutrição e em alguns atributos químicos do solo. Os tratamentos consistiram dos corretivos calcário magnesiano e dolomítico e escória de siderurgia, em três doses: 2,36, 4,72 e 7,08 g por vaso. Utilizou-se o delineamento experimental inteiramente casualizado, com quatro repetições, em esquema fatorial 3x3+1 (três corretivos x três doses + testemunha. Todos os materiais corretivos aumentaram a produção de matéria seca da alface, porém destacaram-se os calcários, sendo que para a escória, a alta concentração do Mn na parte aérea limitou a produção. Na parte aérea da alface, os teores e quantidade acumulada de Ca, Mg e Cu aumentaram, e os teores de Mn e Zn não foram alterados com a aplicação dos corretivos. Todos os materiais corretivos foram eficientes na correção da acidez do solo, especialmente quando se utilizou calcário magnesiano. A escória de siderurgia não é o corretivo mais apropriado para a cultura da alface.

  15. Métodos cromatográficos para determinar aminas biogênicas em alimentos de origem animal

    Directory of Open Access Journals (Sweden)

    César Aquiles Lázaro de la Torre

    2013-12-01

    Full Text Available Aminas biogenicas sao formadas como resultado da descarboxilacao de aminoacidos livres especificos. A analise desses metabolitos e de grande importancia na determinacao da qualidade e monitoramento de biogenicas como histamina e tiramina relacionadas com episodios de intoxicacao em humanos. A cromatografia e uma tecnica de separacao química usada para caracterizar aminas biogenicas. Variacoes da tecnica (cromatografia liquida, em camada delgada e gasosa tem sido amplamente usadas, porem a complexidade da matriz alimentar faz com que sejam realizadas mudancas nos processos de extracao, derivatizacao e deteccao em concordancia com cada grupo de alimento. A cromatografia liquida de alta eficiencia (CLAE e o metodo mais utilizado na determinacao de aminas biogenicas em alimentos. Contudo, devido a importancia das aminas biogenicas no controle da qualidade e a seguranca do consumidor, os pesquisadores tentam desenvolver novos metodos com o intuito de uma analise mais rapida e precisa para o controle de alimentos no mercado. O objetivo da revisao e apresentar algumas tecnicas cromatograficas aplicadas no monitoramento de aminas biogenicas em produtos de origem animal.

  16. da Zehirlenmeleri

    Directory of Open Access Journals (Sweden)

    Necati Akbulut

    2015-02-01

    Full Text Available Gıda Teknolojisinin gelişmesi ile, gıda maddesinin tüketici için daha alımlı olmasını sağlamak, kısa zamanda bozulmasını engellemek ve pazara yeni çeşitler sunmak için bazı kimyasal maddeler kullanılmaya başlanılmıştır. Bunun yanında tarımda kullanılan kimyasal maddeler artmış, ambalaj sanayi gelişmiş, bu dada maddelerine bulaşan maddelerin türlerini arttırmıştır. Ayrıca gıda maddelerine belirli amacı olmadan katılan maddelerde vardır. Diğer taraftan tüketiciyi aldatmak, hile yapmak, çok kar sağlamak veya kötü kaliteyi gizlemek amacı ile de kullanılan maddeler bulunmaktadır. İster teknik zorunluk, ister hile amacıyla olsun bu tür yabancı maddeler öncelikle insan sağlığını ilgilendirmektedir. Bazı maddelerin vücuda alınması sakıncasız olduğu halde, bazıları sakıncalıdır. Sakıncasız olanlarında belirli bir sınırın üzerinde uzun süre alınmaları zararlı olabilmektedir. Bu toplum sağlığı sorunu birçok ülkeyi gıda sanayiinde kullanılan kimyasal maddelerin hoşgörü sınırlarının hesaplanması noktasına götürmüştür.

  17. USO DA DORAMECTINA NO TRATAMENTO DA DEMODICOSE CANINA: RELATO DE CASO

    Directory of Open Access Journals (Sweden)

    Lívia Silva JACOMINE

    2017-12-01

    Full Text Available A demodicose ou sarna demodécica é uma dermatoparasitose não contagiosa e ocasionada por uma reação cutânea inflamatória relacionada à multiplicação excessiva do ácaro Demodex canis. As causas da doença não estão totalmente definidas, entretanto, a baixa imunidade é um fator que predispõe a doença. A classificação da demodicose baseia-se na localização corpórea do animal, sendo localizada ou generalizada. O prognóstico é variável. Os sinais clínicos são alopecia, eritema, descamação, hiperpigmentação, liquenificação, febre e linfoadenopatia. O diagnóstico é realizado através de raspado cutâneo, impressão em fita de acetato, tricograma ou biópsia de pele. O tratamento há décadas foi realizado através do uso do amitraz, porém, além da toxicidade, o uso inadequado desse fármaco ocasionou em desenvolvimento de resistência. Atualmente, as lactonas macrocíclicas, tais como ivermectina, doramectina, milbemicina oxima e moxidectina vêm sendo empregadas com sucesso em cães. Entretanto, cães das raças dolicocéfalas, tais como Collie e Pastor Alemão, dentre outras, manifestam reações tóxicas graves com o uso da ivermectina. Assim, o objetivo desse trabalho foi relatar um caso do uso da doramectina na dose de 0,6 mg/kg, via oral a cada 72 horas, durante 60 dias no tratamento da demodicose generalizada em um cão da raça Pastor Alemão. Os resultados obtidos demostraram a melhora clínica do animal e nenhum efeito adverso foi clinicamente observado. Concluindo, não obstante a demodicose ser uma doença clínica desafiadora, o uso da doramectina demostrou vantagens pelo maior intervalo de administração, redução na duração do tratamento e a ausência de reações adversas, comuns as avermectinas quando usadas em animais dolicocéfalos.

  18. Simulação do efeito do manejo da palha e do nitrogênio na produtividade da cana-de-açúcar

    OpenAIRE

    Costa, Leandro G.; Marin, Fabio R.; Nassif, Daniel S. P.; Pinto, Helena M. S.; Lopes-Assad, Maria L. R. C.

    2014-01-01

    Propôs-se, com este trabalho, modelar o crescimento e a produtividade da cana-de-açúcar em sistemas de colheita mecanizada avaliando o efeito da remoção da palhada remanescente em combinação com doses de adubação nitrogenada de 60, 120 e 180 kg ha-1. Utilizou-se o modelo APSIM-Sugar calibrado com base em dois experimentos localizados em Piracicaba, SP, e Salinas, MG, conduzidos com a variedade SP80-1842. Avaliou-se a sensibilidade do modelo aos parâmetros de solo e de variedade, em especial a...

  19. A REFORMA DA IGREJA

    Directory of Open Access Journals (Sweden)

    Vítor Galdino Feller

    2014-01-01

    Full Text Available O pontificado do papa Francisco trouxe à tona o tema da reforma da Igreja. Retoma-se essa causa que acompanha a história da Igreja desde os seus primórdios e que interessa a todos os membros do povo santo de Deus. O texto divide-se em quatro partes. Primeiro, faz-se um apanhado histórico dos anseios de reforma da Igreja, mostrando que, muitas vezes em instâncias subterrâneas, sempre houve o desejo e também ações concretas de renovação. Em seguida, apresenta-se como razão para a reforma da Igreja o anúncio e a realização do Reino de Deus, pelo qual é preciso que a Igreja se volte à concretude humana e histórica de Jesus de Nazaré, pela superação do apego ao poder e às estruturas religiosas. Num terceiro momento, trata-se do critério pelo qual se mede a realização e a veracidade da reforma da Igreja: a santidade de cada fiel e do povo cristão no meio do mundo. Por fim, conclui-se que o caminho para a reforma da Igreja está na escuta dos clamores do Espírito Santo, que fala na própria Igreja e no mundo através do sensus fidei dos fiéis, das Igrejas particulares, dos pobres, das mulheres e das realidades terrestres. ABSTRACT: The pontificate of Pope Francis brought to the surface the theme of reform of the Church. This essay takes up this cause that accompanies the history of the Church from its beginnings and concerns all the members of the holy people of God. The text is divided into four parts. First, it gives a historical summary of the yearnings for reform of the Church, showing that, in many instances subterranean, there has always been the desire and also the concrete actions of renewal. Following from this, the essay presents as the reason for the reform of the Church the proclamation and the realization of the Kingdom of God, whereby it is necessary that the Church return to the concrete human and historical Jesus of Nazareth, in order to overcome the addiction to power and to religious structures. In the

  20. A cultura da internet

    OpenAIRE

    Cádima, Francisco Rui

    2017-01-01

    O novo ambiente digital é cada vez mais perturbante na sua dimensão ‘visível’ e está, em boa parte, incontrolável nessa área ainda algo desconhecida da Internet negra, conhecida por deep web ou dark net, convoca-nos para uma reflexão profunda de largo espectro, que não se pode vincular apenas às questões de mercado, tecnológicas e de redes, mas que nos vem alertar sobretudo para a ordem do político e da cidadania, do ‘desconhecido’ e do conhecimento e, enfim, do acesso à rede, quer no que is...

  1. Pharmacokinetics and tolerability of DA-8031, a novel selective serotonin reuptake inhibitor for premature ejaculation in healthy male subjects

    Directory of Open Access Journals (Sweden)

    Shin D

    2017-03-01

    Full Text Available Dongseong Shin,1 SeungHwan Lee,2 Sojeong Yi,2 Seo Hyun Yoon,2 Joo-Youn Cho,2 Mi Young Bahng,3 In-Jin Jang,2 Kyung-Sang Yu2 1Clinical Trials Center, Gachon University Gil Medical Center, Incheon, 2Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, 3Department of Product Development, Dong-A ST, Seoul, Korea Objective: DA-8031 is a selective serotonin reuptake inhibitor under development for the treatment of premature ejaculation. This is the first-in-human study aimed at evaluating the pharmacokinetics and tolerability of DA-8031 and its metabolites (M1, M2, M4, and M5 in the plasma and urine after administration of a single oral dose in healthy male subjects.Methods: A dose block-randomized, double-blind, placebo-controlled, single ascending dose study was conducted. Subjects received either placebo or a single dose of DA-8031 at 5, 10, 20, 40, 60, 80, or 120 mg. DA-8031 and its four metabolites were analyzed in the plasma and urine for pharmacokinetic evaluation. The effect of genetic polymorphisms of cytochrome-P450 (CYP enzymes on the pharmacokinetics of DA-8031 was evaluated.Results: After a single dose, plasma DA-8031 reached the maximum concentration at a median of 2–3 h and was eliminated with terminal elimination half-life of 17.9–28.7 h. The mean renal clearance was 3.7–5.6 L/h. Dose-proportional pharmacokinetics was observed over the dose range of 20–80 mg. Among the metabolites, M4 had the greatest plasma concentration, followed by M5 and M1. Subjects with CYP2D6 intermediate metabolizer had significantly greater dose-normalized Cmax and AUC0–t of DA-8031 as well as smaller metabolic ratios than those subjects with CYP2D6 extensive metabolizer. The most common adverse events were nausea, dizziness, and headache, and no serious adverse events were reported.Conclusion: In conclusion, the systemic exposure of DA-8031 was increased proportionally to the dose within 20

  2. [da Vinci surgical system].

    Science.gov (United States)

    Watanabe, Gou; Ishikawa, Norihiro

    2014-07-01

    The da Vinci surgical system was developed by Intuitive Surgical Inc. in the United States as an endoscopic surgical device to assist remote control surgeries. In 1998, the Da Vinci system was first used for cardiothoracic procedures. Currently a combination of robot-assisted internal thoracic artery harvest together with coronary artery bypass grafting (CABG) through a mini-incision (ThoraCAB) or totally endoscopic procedures including anastomoses under robotic assistance (TECAB) are being conducted for the treatment of coronary artery diseases. With the recent advances in catheter interventions, hybrid procedures combining catheter intervention with ThoraCAB or TECAB are anticipated in the future.On the other hand, with the decrease in number of coronary artery bypass surgeries, the share of valvular surgeries is expected to increase in the future. Among them, mitral valvuloplasty for mitral regurgitation is anticipated to be conducted mainly by low-invasive procedures, represented by minimally invasive cardiac surgery( MICS) and robot-assisted surgery. Apart from the intrinsic good surgical view, robotic-assisted systems offer additional advantages of the availability of an amplified view and the easy to observe the mitral valve in the physiological position. Thus, robotic surgical surgeries that make complicated procedures easier are expected to accomplish further developments in the future. Furthermore, while the number of surgeries for atrial septal defects has decreased dramatically following the widespread use of Amplatzer septal occluder, robotic surgery may become a good indication for cases in which the Amplatzer device is not indicated. In Japan, clinical trial of the da Vinci robotic system for heart surgeries has been completed. Statutory approval of the da Vinci system for mitral regurgitation and atrial septal defects is anticipated in the next few years.

  3. Assessment of internal doses

    CERN Document Server

    Rahola, T; Falk, R; Isaksson, M; Skuterud, L

    2002-01-01

    There is a definite need for training in dose calculation. Our first course was successful and was followed by a second, both courses were fully booked. An example of new tools for software products for bioassay analysis and internal dose assessment is the Integrated Modules for Bioassay Analysis (IMBA) were demonstrated at the second course. This suite of quality assured code modules have been adopted in the UK as the standard for regulatory assessment purposes. The intercomparison measurements are an important part of the Quality Assurance work. In what is known as the sup O utside workers ' directive it is stated that the internal dose measurements shall be included in the European Unions supervision system for radiation protection. The emergency preparedness regarding internal contamination was much improved by the training with and calibration of handheld instruments from participants' laboratories. More improvement will be gained with the handbook giving practical instructions on what to do in case of e...

  4. Mean inactivation dose (D)

    International Nuclear Information System (INIS)

    Vijayakumar, S.; Ng, T.C.; Raudkivi, U.; Meaney, T.J.

    1990-01-01

    By predicting treatment outcome to radiotherapy from in vitro radiobiological parameters, not only individual patient treatments can be tailored, but also new promising treatment protocols can be tried in patients in whom unfavorable outcome is predicted. In this respect, choosing the right parameter can be very important. Unlike D 0 and N which provide information of the distal part of the survival curve, mean inactivation dose (D) estimates overall radiosensitivity. However, the parameters reflecting the response at the clinically relevant low-dose region are neglected in the literature. In a literature survey of 98 papers in which survival curves or D 0 /N were used, only in 2 D was used. In 21 papers the D 0 /n values were important in drawing conclusions. By calculating D in 3 of these 21 papers, we show that the conclusion drawn may be altered with the use of D. The importance of ''low-dose-region-parameters'' is reviewed. (orig.)

  5. A utilização da teoria da aprendizagem significativa no ensino da Enfermagem

    OpenAIRE

    Alana Tamar Oliveira de Sousa; Nilton Soares Formiga; Simone Helena dos Santos Oliveira; Marta Miriam Lopes Costa; Maria Júlia Guimarães Oliveira Soares

    2015-01-01

    RESUMO Objetivo: sintetizar a produção científica acerca da Teoria da Aprendizagem Significativa no processo de ensino-aprendizagem em Enfermagem. Método: revisão integrativa realizada nas bases de dados MEDLINE, LILACS, SciELO, BDENF e CINAHL, com artigos que abordaram a temática ou aspectos da teoria da aprendizagem significativa de David Ausubel. Fizeram parte da amostra dez artigos, sendo seis escritos no idioma português e quatro no inglês, publicados de 1998 a 2013. Resultados: cinco...

  6. Os (descaminhos da identidade

    Directory of Open Access Journals (Sweden)

    Oliveira Roberto Cardoso de

    2000-01-01

    Full Text Available A conferência procurou apresentar uma interpretação das vicissitudes da identidade étnica e/ou nacional quando observada em situações de ambigüidade. É quando o processo identitário expressa crises reais ou virtuais, como as que têm lugar entre imigrantes latino-americanos nos Estados Unidos, entre povos de diferentes regiões da Espanha emigrados para Barcelona, entre catalães espanhóis, franceses e andorranos residentes em Andorra, e entre povos indígenas em regiões de fronteira do Brasil com países vizinhos. O exame do processo identitário que tem lugar em diferentes latitudes, nas Américas e na Europa, sugere que os fenômenos socioculturais de etnicidade e de nacionalidade possuem em comum características tais como a busca de reconhecimento da pessoa moral, o respeito à diferença e, como corolário ético, a elevação do que se pode definir como "taxa de consideração".

  7. Hepatotoxicidade da cianotoxina microcistina

    Directory of Open Access Journals (Sweden)

    Andréa de Castro Leal

    2004-01-01

    Full Text Available Constitui interesse emergente em saúde pública avaliar a possibilidade de intoxicação humana por biotoxinas de algas cianofíceas, principalmente as hepatotoxinas do grupo das microcistinas. A microcistina, um heptapeptídeo monocíclico, é produzida principalmente pela cianobactéria Microcistis aeruginosa. São caracterizadas por alguns aminoácidos variáveis, dois deles com uma estrutura não usual que possuem importante papel na hepatotoxidade da microcistina. Apesar do acometimento humano atribuído as microcistinas incluírem gastroenterite, reações alérgicas ou irritativas, neurotoxicidade, o principal alvo da toxina é o fígado. Nos hepatócitos as microcistinas são carreadas pelo sistema transportador do ácido biliar, inibindo a atividade da proteína fosfatase no citoplasma. A inibição leva a mudanças morfológicas na membrana plasmática pela hiperfosforilação de citoqueratinas, e à atividade de promoção tumoral pelas proteínas hiperfosforiladas. Os métodos de detecção e quantificação de microcistinas no ambiente incluem a cromatografia líquida, o bioensaio em camundongos e os testes imunoenzimáticos. O último vem ganhando destaque pela praticidade e alta sensibilidade.

  8. Dose Reduction Techniques

    International Nuclear Information System (INIS)

    WAGGONER, L.O.

    2000-01-01

    As radiation safety specialists, one of the things we are required to do is evaluate tools, equipment, materials and work practices and decide whether the use of these products or work practices will reduce radiation dose or risk to the environment. There is a tendency for many workers that work with radioactive material to accomplish radiological work the same way they have always done it rather than look for new technology or change their work practices. New technology is being developed all the time that can make radiological work easier and result in less radiation dose to the worker or reduce the possibility that contamination will be spread to the environment. As we discuss the various tools and techniques that reduce radiation dose, keep in mind that the radiological controls should be reasonable. We can not always get the dose to zero, so we must try to accomplish the work efficiently and cost-effectively. There are times we may have to accept there is only so much you can do. The goal is to do the smart things that protect the worker but do not hinder him while the task is being accomplished. In addition, we should not demand that large amounts of money be spent for equipment that has marginal value in order to save a few millirem. We have broken the handout into sections that should simplify the presentation. Time, distance, shielding, and source reduction are methods used to reduce dose and are covered in Part I on work execution. We then look at operational considerations, radiological design parameters, and discuss the characteristics of personnel who deal with ALARA. This handout should give you an overview of what it takes to have an effective dose reduction program

  9. CT dose management

    International Nuclear Information System (INIS)

    Zasheva, Ts.; Georgiev, E.; Kirova, G.

    2013-01-01

    Full text: Introduction: In recent decades Computed Tomography established itself as one of the most common study with a very wide range of applications and techniques of scanning. Best diagnostic value of the method resist to the risks of ionizing radiation, as statistics show that CT is one of the main sources of continuously increasing dose to the population. What you will learn: The physical parameters of the X-ray tube and the principles of image reconstruction; The relationship between variables parameters and the received dose; The ratio between the force and voltage of the current to the image quality, Influence of the used contrast medium to the physical properties of the image, The ratio of patient BMI to image processing, Effective use of knowledge for the optimal CT protocol. Discussions: The goal to reduce the dose received by the patient during a CT scan while keeping the diagnostic quality of the image puts to the test as handset X-ray producers and technicians who need to master the technique of study protocol forming as well as to balance the harm - benefit ratio. Among the most popular techniques are these of dose modulation, low-dose computed tomography at the expense of a reduction of the current or voltage intensity, and control of the number of post-processing algorithms for the image reconstruction. Conclusion: The training of radiologists and X-ray technicians plays a major role in optimizing of technical parameters in view of the reduction of the dose for the patient, while maintaining the diagnostic quality of the image

  10. Dose Reduction Techniques

    Energy Technology Data Exchange (ETDEWEB)

    WAGGONER, L.O.

    2000-05-16

    As radiation safety specialists, one of the things we are required to do is evaluate tools, equipment, materials and work practices and decide whether the use of these products or work practices will reduce radiation dose or risk to the environment. There is a tendency for many workers that work with radioactive material to accomplish radiological work the same way they have always done it rather than look for new technology or change their work practices. New technology is being developed all the time that can make radiological work easier and result in less radiation dose to the worker or reduce the possibility that contamination will be spread to the environment. As we discuss the various tools and techniques that reduce radiation dose, keep in mind that the radiological controls should be reasonable. We can not always get the dose to zero, so we must try to accomplish the work efficiently and cost-effectively. There are times we may have to accept there is only so much you can do. The goal is to do the smart things that protect the worker but do not hinder him while the task is being accomplished. In addition, we should not demand that large amounts of money be spent for equipment that has marginal value in order to save a few millirem. We have broken the handout into sections that should simplify the presentation. Time, distance, shielding, and source reduction are methods used to reduce dose and are covered in Part I on work execution. We then look at operational considerations, radiological design parameters, and discuss the characteristics of personnel who deal with ALARA. This handout should give you an overview of what it takes to have an effective dose reduction program.

  11. Radioactive cloud dose calculations

    International Nuclear Information System (INIS)

    Healy, J.W.

    1984-01-01

    Radiological dosage principles, as well as methods for calculating external and internal dose rates, following dispersion and deposition of radioactive materials in the atmosphere are described. Emphasis has been placed on analytical solutions that are appropriate for hand calculations. In addition, the methods for calculating dose rates from ingestion are discussed. A brief description of several computer programs are included for information on radionuclides. There has been no attempt to be comprehensive, and only a sampling of programs has been selected to illustrate the variety available

  12. Fertilizer micro-dosing

    International Development Research Centre (IDRC) Digital Library (Canada)

    Localized application of small quantities of fertilizer (micro-dosing), combined with improved planting pits for rainwater harvesting, has generated greater profits and food security for women farmers in the Sahel. • Women are 25% more likely to use combined applications, and have expanded areas of food crops (cowpea,.

  13. Low dose epidemiologic studies

    International Nuclear Information System (INIS)

    Anon.

    1990-01-01

    In this chapter the BEIR committee has reviewed low-dose irradiation studies since the BEIR III report. They have considered the carcinogenic effectiveness of low-LET in populations exposed to radiation from a number of different sources: diagnostic radiography; fallout from nuclear weapons testing; nuclear installations; radiation in the workplace and high levels of natural background radiation

  14. Radiation doses to Finns

    International Nuclear Information System (INIS)

    Rantalainen, L.

    1996-01-01

    The estimated annual radiation doses to Finns have been reduced in the recent years without any change in the actual radiation environment. This is because the radiation types have been changed. The risk factors will probably be changed again in the future, because recent studies show discrepancies in the neutron dosimetry concerning the city of Hiroshima. Neutron dosimetry discrepancy has been found between the predicted and estimated neutron radiation. The prediction of neutron radiation is calculated by Monte Carlo simulations, which have also been used when designing recommendations for the limits of radiation doses (ICRP60). Estimation of the neutron radiation is made on the basis of measured neutron activation of materials in the city. The estimated neutron dose beyond 1 km is two to ten, or more, times as high as the predicted dose. This discrepancy is important, because the most relevant distances with respect to radiation risk evaluation are between 1 and 2 km. Because of this discrepancy, the present radiation risk factors for gamma and neutron radiation, which rely on the Monte Carlo calculations, are false, too. The recommendations of ICRP60 have been adopted in a few countries, including Finland, and they affect the planned common limits of the EU. It is questionable whether happiness is increased by adopting false limits, even if they are common. (orig.) (2 figs., 1 tab.)

  15. Dose Reduction Techniques

    CERN Document Server

    Waggoner, L O

    2000-01-01

    As radiation safety specialists, one of the things we are required to do is evaluate tools, equipment, materials and work practices and decide whether the use of these products or work practices will reduce radiation dose or risk to the environment. There is a tendency for many workers that work with radioactive material to accomplish radiological work the same way they have always done it rather than look for new technology or change their work practices. New technology is being developed all the time that can make radiological work easier and result in less radiation dose to the worker or reduce the possibility that contamination will be spread to the environment. As we discuss the various tools and techniques that reduce radiation dose, keep in mind that the radiological controls should be reasonable. We can not always get the dose to zero, so we must try to accomplish the work efficiently and cost-effectively. There are times we may have to accept there is only so much you can do. The goal is to do the sm...

  16. Dose tracking and dose auditing in a comprehensive computed tomography dose-reduction program.

    Science.gov (United States)

    Duong, Phuong-Anh; Little, Brent P

    2014-08-01

    Implementation of a comprehensive computed tomography (CT) radiation dose-reduction program is a complex undertaking, requiring an assessment of baseline doses, an understanding of dose-saving techniques, and an ongoing appraisal of results. We describe the role of dose tracking in planning and executing a dose-reduction program and discuss the use of the American College of Radiology CT Dose Index Registry at our institution. We review the basics of dose-related CT scan parameters, the components of the dose report, and the dose-reduction techniques, showing how an understanding of each technique is important in effective auditing of "outlier" doses identified by dose tracking. Copyright © 2014 Elsevier Inc. All rights reserved.

  17. Tratamento clínico da epilepsia resistente

    Directory of Open Access Journals (Sweden)

    Benito Pereira Damasceno

    1988-12-01

    Full Text Available Foram estudados 34 casos de epilepsia de difícil controle, encaminhados ao Grupo de Trabalho de Epilepsia (GTE do Instituto de Neurologia de Goiânia de 1984 a 1986. Todos eram submetidos a reavaliação neurológica. Vinte e três dos 34 pacientes tinham crises parciais complexas. A maioria foi tratada com carbamazepina, difenil-hidantoína e ácido valpróico, em forma monoterápica ou associada entre si. Obteve-se redução de mais de 80% da freqüência das crises em 22 pacientes (64,7%, além de leve melhora da qualidade de vida. Os autores concluem sobre as vantagens de uma equipe especializada, multidisciplinar, na abordagem da epilepsia rebelde e ressaltam a necessidade de: a. um correto diagnóstico das crises, seguido do uso da medicação apropriada, por tempo suficiente (mínimo de 0 meses e em dose adequada (até a dose máxima tolerável, abandonando-a só depois do controle de sua concentração sérica; b. um bom engajamento do paciente e de sua família no tratamento.

  18. When is a dose not a dose?

    International Nuclear Information System (INIS)

    Bond, V.P.

    1991-01-01

    Although an enormous amount of progress has been made in the fields of radiation protection and risk assessment, a number of significant problems remain. The one problem which transcends all the rest, and which has been subject to considerable misunderstanding, involves what has come to be known as the 'linear non-threshold hypothesis', or 'linear hypothesis'. Particularly troublesome has been the interpretation that any amount of radiation can cause an increase in the excess incidence of cancer. The linear hypothesis has dominated radiation protection philosophy for more than three decades, with enormous financial, societal and political impacts and has engendered an almost morbid fear of low-level exposure to ionizing radiation in large segments of the population. This document presents a different interpretation of the linear hypothesis. The basis for this view lies in the evolution of dose-response functions, particularly with respect to their use initially in the context of early acute effects, and then for the late effects, carcinogenesis and mutagenesis. 11 refs., 4 figs

  19. Dose specification for radiation therapy: dose to water or dose to medium?

    International Nuclear Information System (INIS)

    Ma, C-M; Li Jinsheng

    2011-01-01

    The Monte Carlo method enables accurate dose calculation for radiation therapy treatment planning and has been implemented in some commercial treatment planning systems. Unlike conventional dose calculation algorithms that provide patient dose information in terms of dose to water with variable electron density, the Monte Carlo method calculates the energy deposition in different media and expresses dose to a medium. This paper discusses the differences in dose calculated using water with different electron densities and that calculated for different biological media and the clinical issues on dose specification including dose prescription and plan evaluation using dose to water and dose to medium. We will demonstrate that conventional photon dose calculation algorithms compute doses similar to those simulated by Monte Carlo using water with different electron densities, which are close (<4% differences) to doses to media but significantly different (up to 11%) from doses to water converted from doses to media following American Association of Physicists in Medicine (AAPM) Task Group 105 recommendations. Our results suggest that for consistency with previous radiation therapy experience Monte Carlo photon algorithms report dose to medium for radiotherapy dose prescription, treatment plan evaluation and treatment outcome analysis.

  20. Eficiência no uso da água na cana-de-açúcar sob diferentes lâminas de irrigação e níveis de zinco no litoral paraibano Water use efficiency in sugarcane crop under different depths of irrigation and zinc doses in coastal region of Paraíba, Brazil

    Directory of Open Access Journals (Sweden)

    Carlos H. A. Farias

    2008-09-01

    Full Text Available Esta pesquisa foi conduzida em área experimental da Fazenda Capim II, localizada no Município de Capim - PB, com o intuito de determinar a eficiência no uso da água (EUA pela cana-de-açúcar (Saccharum officinarum L., cultivar SP 79-1011. O delineamento experimental consistiu em blocos casualizados, com três repetições, em esquema fatorial 5 x 5. Os tratamentos referentes à lâmina de irrigação foram: sequeiro; 25; 50; 75 e 100% da ETc (1.026,57 mm com as respectivas precipitações efetivas de 780,06; 713,31; 487,54; 243,71 e 194,51 mm; os níveis de zinco estudados foram 0; 1; 2; 3 e 4 kg ha-1. O equipamento de irrigação utilizado foi do tipo pivô central, com turno de rega de nove dias. A eficiência no uso da água (EUA na produção de colmos e de açúcar aumenta à medida que se eleva a lâmina total de água aplicada à cultura. Para a região norte-paraibana dos tabuleiros costeiros, a EUA na produção de colmo e de açúcar, de forma maximizada, é 7,12 e 0,67 kg m-3, respectivamente.The study was conducted in an experimental area of the Capim II Farm, located in the municipality of Capim - PB, Brazil, with the objective of determining the efficiency in the use of the water (WUE for the sugarcane crop (Saccharum officinarum L., cultivar SP 79-1011. The experimental design consisted of randomized blocks, with three replications in a 5 x 5 factorial design. The irrigation treatments were: rainfed; 25; 50; 75 and 100% of the ETc (1,026.57 mm with the respective effective precipitations of 780.06; 713.31; 487.54; 243.71 and 194.51 mm. The levels of zinc studied were 0; 1; 2; 3 and 4 kg ha-1. The irrigation equipment used in the study was a central pivot with irrigation frequency of nine days. The water use efficiency (WUE of sugarcane crop in terms of cane production and of sugar increased with the depth of water applied. For the Coastal Table Lands of northern Paraiba, the maximized WUE for sugarcane and sugar production is

  1. Hepatotoxicidade da cianotoxina microcistina

    OpenAIRE

    Leal,Andréa de Castro; Soares,Manoel do Carmo Pereira

    2004-01-01

    Constitui interesse emergente em saúde pública avaliar a possibilidade de intoxicação humana por biotoxinas de algas cianofíceas, principalmente as hepatotoxinas do grupo das microcistinas. A microcistina, um heptapeptídeo monocíclico, é produzida principalmente pela cianobactéria Microcistis aeruginosa. São caracterizadas por alguns aminoácidos variáveis, dois deles com uma estrutura não usual que possuem importante papel na hepatotoxidade da microcistina. Apesar do acometimento humano atrib...

  2. Tumor significant dose

    International Nuclear Information System (INIS)

    Supe, S.J.; Nagalaxmi, K.V.; Meenakshi, L.

    1983-01-01

    In the practice of radiotherapy, various concepts like NSD, CRE, TDF, and BIR are being used to evaluate the biological effectiveness of the treatment schedules on the normal tissues. This has been accepted as the tolerance of the normal tissue is the limiting factor in the treatment of cancers. At present when various schedules are tried, attention is therefore paid to the biological damage of the normal tissues only and it is expected that the damage to the cancerous tissues would be extensive enough to control the cancer. Attempt is made in the present work to evaluate the concent of tumor significant dose (TSD) which will represent the damage to the cancerous tissue. Strandquist in the analysis of a large number of cases of squamous cell carcinoma found that for the 5 fraction/week treatment, the total dose required to bring about the same damage for the cancerous tissue is proportional to T/sup -0.22/, where T is the overall time over which the dose is delivered. Using this finding the TSD was defined as DxN/sup -p/xT/sup -q/, where D is the total dose, N the number of fractions, T the overall time p and q are the exponents to be suitably chosen. The values of p and q are adjusted such that p+q< or =0.24, and p varies from 0.0 to 0.24 and q varies from 0.0 to 0.22. Cases of cancer of cervix uteri treated between 1978 and 1980 in the V. N. Cancer Centre, Kuppuswamy Naidu Memorial Hospital, Coimbatore, India were analyzed on the basis of these formulations. These data, coupled with the clinical experience, were used for choice of a formula for the TSD. Further, the dose schedules used in the British Institute of Radiology fraction- ation studies were also used to propose that the tumor significant dose is represented by DxN/sup -0.18/xT/sup -0.06/

  3. [Evaluation of Organ Dose Estimation from Indices of CT Dose Using Dose Index Registry].

    Science.gov (United States)

    Iriuchijima, Akiko; Fukushima, Yasuhiro; Ogura, Akio

    Direct measurement of each patient organ dose from computed tomography (CT) is not possible. Most methods to estimate patient organ dose is using Monte Carlo simulation with dedicated software. However, dedicated software is too expensive for small scale hospitals. Not every hospital can estimate organ dose with dedicated software. The purpose of this study was to evaluate the simple method of organ dose estimation using some common indices of CT dose. The Monte Carlo simulation software Radimetrics (Bayer) was used for calculating organ dose and analysis relationship between indices of CT dose and organ dose. Multidetector CT scanners were compared with those from two manufactures (LightSpeed VCT, GE Healthcare; SOMATOM Definition Flash, Siemens Healthcare). Using stored patient data from Radimetrics, the relationships between indices of CT dose and organ dose were indicated as each formula for estimating organ dose. The accuracy of estimation method of organ dose was compared with the results of Monte Carlo simulation using the Bland-Altman plots. In the results, SSDE was the feasible index for estimation organ dose in almost organs because it reflected each patient size. The differences of organ dose between estimation and simulation were within 23%. In conclusion, our estimation method of organ dose using indices of CT dose is convenient for clinical with accuracy.

  4. Effects of proton radiation dose, dose rate and dose fractionation on hematopoietic cells in mice

    International Nuclear Information System (INIS)

    Ware, J.H.; Rusek, A.; Sanzari, J.; Avery, S.; Sayers, C.; Krigsfeld, G.; Nuth, M.; Wan, X.S.; Kennedy, A.R.

    2010-01-01

    The present study evaluated the acute effects of radiation dose, dose rate and fractionation as well as the energy of protons in hematopoietic cells of irradiated mice. The mice were irradiated with a single dose of 51.24 MeV protons at a dose of 2 Gy and a dose rate of 0.05-0.07 Gy/min or 1 GeV protons at doses of 0.1, 0.2, 0.5, 1, 1.5 and 2 Gy delivered in a single dose at dose rates of 0.05 or 0.5 Gy/min or in five daily dose fractions at a dose rate of 0.05 Gy/min. Sham-irradiated animals were used as controls. The results demonstrate a dose-dependent loss of white blood cells (WBCs) and lymphocytes by up to 61% and 72%, respectively, in mice irradiated with protons at doses up to 2 Gy. The results also demonstrate that the dose rate, fractionation pattern and energy of the proton radiation did not have significant effects on WBC and lymphocyte counts in the irradiated animals. These results suggest that the acute effects of proton radiation on WBC and lymphocyte counts are determined mainly by the radiation dose, with very little contribution from the dose rate (over the range of dose rates evaluated), fractionation and energy of the protons.

  5. Effects of proton radiation dose, dose rate and dose fractionation on hematopoietic cells in mice.

    Science.gov (United States)

    Ware, J H; Sanzari, J; Avery, S; Sayers, C; Krigsfeld, G; Nuth, M; Wan, X S; Rusek, A; Kennedy, A R

    2010-09-01

    The present study evaluated the acute effects of radiation dose, dose rate and fractionation as well as the energy of protons in hematopoietic cells of irradiated mice. The mice were irradiated with a single dose of 51.24 MeV protons at a dose of 2 Gy and a dose rate of 0.05-0.07 Gy/min or 1 GeV protons at doses of 0.1, 0.2, 0.5, 1, 1.5 and 2 Gy delivered in a single dose at dose rates of 0.05 or 0.5 Gy/min or in five daily dose fractions at a dose rate of 0.05 Gy/min. Sham-irradiated animals were used as controls. The results demonstrate a dose-dependent loss of white blood cells (WBCs) and lymphocytes by up to 61% and 72%, respectively, in mice irradiated with protons at doses up to 2 Gy. The results also demonstrate that the dose rate, fractionation pattern and energy of the proton radiation did not have significant effects on WBC and lymphocyte counts in the irradiated animals. These results suggest that the acute effects of proton radiation on WBC and lymphocyte counts are determined mainly by the radiation dose, with very little contribution from the dose rate (over the range of dose rates evaluated), fractionation and energy of the protons.

  6. Aspectos moleculares da anemia falciforme

    Directory of Open Access Journals (Sweden)

    Galiza Neto Gentil Claudino de

    2003-01-01

    Full Text Available No presente artigo abordaram-se vários aspectos relacionados à natureza molecular da anemia falciforme, desordem hematológica de caráter hereditário que acomete expressivo número de indivíduos em várias regiões do mundo. As pesquisas realizadas em torno desta patologia da hemácia, ao longo de quase um século, a partir de 1910, cooperaram para a criação de um novo e importante segmento da ciência, denominado biologia molecular. A descoberta dos polimorfismos da mutação (GAT->GTG no gene que codifica a cadeia beta da hemoglobina, originando diferentes haplótipos da doença, permitiu um melhor e mais amplo conhecimento em torno da heterogeneidade clínica nos pacientes falcêmicos. Analisando a hemoglobina na sua estrutura normal e mutante, sua produção e evolução, pode-se ter um entendimento mais completo da fisiopatologia desta doença e da sua complexidade clínica.

  7. Occupational dose assessment and national dose registry system in Iran

    International Nuclear Information System (INIS)

    Jafari-Zadeh, M.; Nazeri, F.; Hosseini-Pooya, S. M.; Taheri, M.; Gheshlaghi, F.; Kardan, M. R.; Babakhani, A.; Rastkhah, N.; Yousefi-Nejad, F.; Darabi, M.; Oruji, T.; Gholamali-Zadeh, Z.; Karimi-Diba, J.; Kazemi-Movahed, A. A.; Dashti-Pour, M. R.; Enferadi, A.; Jahanbakhshian, M. H.; Sadegh-Khani, M. R.

    2011-01-01

    This report presents status of external and internal dose assessment of workers and introducing the structure of National Dose Registry System of Iran (NDRSI). As well as types of individual dosemeters in use, techniques for internal dose assessment are presented. Results obtained from the International Atomic Energy Agency intercomparison programme on measurement of personal dose equivalent H p (10) and consistency of the measured doses with the delivered doses are shown. Also, implementation of dosimetry standards, establishment of quality management system, authorisation and approval procedure of dosimetry service providers are discussed. (authors)

  8. Doses from radiation exposure

    CERN Document Server

    Menzel, H G

    2012-01-01

    Practical implementation of the International Commission on Radiological Protection's (ICRP) system of protection requires the availability of appropriate methods and data. The work of Committee 2 is concerned with the development of reference data and methods for the assessment of internal and external radiation exposure of workers and members of the public. This involves the development of reference biokinetic and dosimetric models, reference anatomical models of the human body, and reference anatomical and physiological data. Following ICRP's 2007 Recommendations, Committee 2 has focused on the provision of new reference dose coefficients for external and internal exposure. As well as specifying changes to the radiation and tissue weighting factors used in the calculation of protection quantities, the 2007 Recommendations introduced the use of reference anatomical phantoms based on medical imaging data, requiring explicit sex averaging of male and female organ-equivalent doses in the calculation of effecti...

  9. Radiation dose rate meter

    International Nuclear Information System (INIS)

    Kronenberg, S.; Siebentritt, C.R.

    1981-01-01

    A combined dose rate meter and charger unit therefor which does not require the use of batteries but on the other hand produces a charging potential by means of a piezoelectric cylinder which is struck by a manually triggered hammer mechanism. A tubular type electrometer is mounted in a portable housing which additionally includes a geiger-muller (Gm) counter tube and electronic circuitry coupled to the electrometer for providing multi-mode operation. In one mode of operation, an rc circuit of predetermined time constant is connected to a storage capacitor which serves as a timed power source for the gm tube, providing a measurement in terms of dose rate which is indicated by the electrometer. In another mode, the electrometer indicates individual counts

  10. Small dose... big poison.

    Science.gov (United States)

    Braitberg, George; Oakley, Ed

    2010-11-01

    It is not possible to identify all toxic substances in a single journal article. However, there are some exposures that in small doses are potentially fatal. Many of these exposures are particularly toxic to children. Using data from poison control centres, it is possible to recognise this group of exposures. This article provides information to assist the general practitioner to identify potential toxic substance exposures in children. In this article the authors report the signs and symptoms of toxic exposures and identify the time of onset. Where clear recommendations on the period of observation and known fatal dose are available, these are provided. We do not discuss management or disposition, and advise readers to contact the Poison Information Service or a toxicologist for this advice.

  11. Resposta do milho a doses de fósforo Response of corn to doses of phosphorus

    Directory of Open Access Journals (Sweden)

    Adelmo L. Bastos

    2010-05-01

    Full Text Available Conduziu-se um experimento em casadevegetação, do Centro de Ciências Agrárias da Universidade Federal de Alagoas, Rio Largo, AL, com o objetivo de avaliar o efeito de diferentes doses de P recomendadas pela capacidade máxima de adsorção de fósforo - CMAP (%, sobre os teores de P e matéria seca da cultura do milho, em solos de Alagoas. Os solos foram classificados como Latossolo Amarelo coeso, Argissolo Acinzentado, Neossolo Flúvico, Neossolo Quartzarênico, Luvissolo Crômico órtico e Luvissolo Crômico pálico. Retiraram-se subamostras para análises físicas, químicas e mineralógicas. O experimento foi arranjado em esquema fatorial (6 x 4 correspondendo a 6 solos e quatro doses de P (0, 10, 20 e 30% da CMAP, em delineamento em blocos casualizados. A determinação do P remanescente foi feita em solução de equilíbrio. A CMAP foi determinada através do fósforo remanescente. A massa de matéria seca da parte aérea da planta apresentou melhor resultado no Luvissolo Crômico pálico, com a dose de 10% da CMAP e o solo que proporcionou os maiores teores de fósforo na planta foi o Neossolo Flúvico na dose de 30% da CMAP.An experiment was conducted in a greenhouse of the Centro de Ciências Agrárias, Universidade Federal de Alagoas - Rio Largo/AL, aiming to evaluate the effect of different doses of P recommended by the maximum adsortion capacity of phosphorus - CMAP (%, on content of P and the production of mass of dry matter in corn. The soils were classified as cohesive Yellow Latosol, Gray Argisol, Fluvic Neosol, Quartzarenic Neosol, ortic Chromic Luvisol and palic Chromic Luvisol. Soil samples were taken for physical, chemical and mineralogical analyses. The experiment was arranged in a factorial design (6 x 4 corresponding to the 6 soils and the 4 doses of P (0, 10, 20 and 30% of the CMAP, in a randomized block design. The determination of the remenecent P was made in a equilibrium solution. The CMAP was determined through

  12. Radiation dose measurements

    International Nuclear Information System (INIS)

    1960-01-01

    About 200 scientists from 28 countries and 5 international organizations met at a symposium on radiation dosimetry held by the International Atomic Energy Agency in June 1960. The aim of the symposium was not so much the description of a large number of measuring instruments as a discussion of the methods used, with special emphasis on those problems which had become important in the context of recent developments, such as the measurement of mixed or very large doses

  13. Low dose epidemiology

    International Nuclear Information System (INIS)

    Tirmarche, M.; Hubert, P.

    1992-01-01

    Actually, epidemiological studies have to establish if the assessment of cancer risk can be verified at low chronic radiation doses. The population surveillance must be very long, the side effects and cancers of such radiation appearing much later. In France, this epidemiological study on nuclear workers have been decided recently. Before describing the experiment and french projects in epidemiology of nuclear workers, the authors present the main english and american studies

  14. REFLETINDO SOBRE AS ESPECIFICIDADES DA GEOGRAFIA NA CRISE DA MODERNIDADE

    Directory of Open Access Journals (Sweden)

    Patrício A. S. Carneiro Carneiro

    2010-08-01

    Full Text Available O presente artigo discute a evolução da ciência moderna, bem como a crise desse paradigma dominante e seus efeitos sobre a geografia. Destaca ainda a necessidade da construção de um novo pensamento científico para além das fronteiras disciplinares e do método absoluto.

  15. A dignidade da pessoa humana na doutrina social da igreja

    Directory of Open Access Journals (Sweden)

    Manzone, Gianni

    2010-01-01

    Full Text Available O texto faz uma análise panorâmica sobre a compreensão da dignidade humana nos diversos textos da Doutrina Social da Igreja, mostrando o entendimento da mesma nos diversos documentos dos Papas, notadamente Leão XII, Pio XI, Pio XII e João Paulo II, além de apontar aspectos históricos e culturais que influenciaram cada pronunciamento, o que foi determinante para a evolução do pensamento do Magistério na questão social. O ponto de partida é a visão antropológica da Doutrina Social da Igreja, resumida em termos de “homem criado por Deus a sua imagem e resgatado pelo sangue de Jesus Cristo” (Sollicitudo Rei Socialis 29. A partir daí, há a defesa do primado do ser humano sobre o social e reivindicações totalitaristas que perpassaram a história recente da humanidade, embora a pessoa seja sempre um ser-em-relação e situado em uma sociedade determinada

  16. Os usos da diversidade

    Directory of Open Access Journals (Sweden)

    Clifford Geertz

    1999-05-01

    Full Text Available Resumo Ao discorrer sobre o “Futuro do Etnocentrismo”, este artigo parte da premissa de que a globalização, apesar de ter – em muitos casos – diminuído as diferenças entre povos, não tem amenizado os preconceitos e as formas de discriminação que ocorrem em nome dessas diferenças. Ele resgata a importância do antropólogo neste cenário lembrando que a diversidade cultural faz parte da sociedade complexa, remetendo-se não apenas a grupos étnicos ou nacionais bem delimitados, mas também a diferenças de geração, gênero, sexo e classe, entre outros. Neste contexto, a tolerância passiva de modos distantes de vida assim como a aceitação pragmática de nosso próprio paroquialismo são atitudes não somente intelectualmente desonestas mas também moralmente repreensíveis. É no encontro incômodo de subjetividades variantes na sua própria sociedade que o antropólogo define seu lugar.

  17. Time-dose modifications

    International Nuclear Information System (INIS)

    Kian Ang, K.

    1987-01-01

    Changes in fractionation schedule can be made by various approaches. However, from the first principle, it is anticipated that strategies of hyperfractionation and/or accelerated fractionation offer the most promised in improving the therapeutic ratio. Hyperfractionation is defined as a treatment schedule in which a large number of significantly reduced dose fractions (--1.2 Gy/fraction) is used to give a greater total dose in a conventional overall time period. The results of the pilot studies testing the efficacy of hyperfractionation have been encouraging. The most valid clinical trial of pure hyperfractionation, however, is that conducted by the EORTC. This study compared 70 Gy in 35 fractions or 80.5 Gy in 70 fractions over 7 weeks in the treatment of patients with oropharyngeal carcinomas. The local tumor control was significantly improved in the hyperfractionated arm without increasing the morbidity. Accelerated fractionation is defined as a schedule in which the overall time of treatment is reduced without significant changes in the total dose and fraction size. The strategy has been used to treat patients with malignant gliomas, melanomas and Head and Neck cancers. The data in Head and Neck Cancers seem to be promising

  18. Dose calculation for electrons

    International Nuclear Information System (INIS)

    Hirayama, Hideo

    1995-01-01

    The joint working group of ICRP/ICRU is advancing the works of reviewing the ICRP publication 51 by investigating the data related to radiation protection. In order to introduce the 1990 recommendation, it has been demanded to carry out calculation for neutrons, photons and electrons. As for electrons, EURADOS WG4 (Numerical Dosimetry) rearranged the data to be calculated at the meeting held in PTB Braunschweig in June, 1992, and the question and request were presented by Dr. J.L. Chartier, the responsible person, to the researchers who are likely to undertake electron transport Monte Carlo calculation. The author also has carried out the requested calculation as it was the good chance to do the mutual comparison among various computation codes regarding electron transport calculation. The content that the WG requested to calculate was the absorbed dose at depth d mm when parallel electron beam enters at angle α into flat plate phantoms of PMMA, water and ICRU4-element tissue, which were placed in vacuum. The calculation was carried out by the versatile electron-photon shower computation Monte Carlo code, EGS4. As the results, depth dose curves and the dependence of absorbed dose on electron energy, incident angle and material are reported. The subjects to be investigated are pointed out. (K.I.)

  19. Dose reduction in evacuation proctography

    International Nuclear Information System (INIS)

    Hare, C.; Halligan, S.; Bartram, C.I.; Gupta, R.; Walker, A.E.; Renfrew, I.

    2001-01-01

    The goal of this study was to reduce the patient radiation dose from evacuation proctography. Ninety-eight consecutive adult patients referred for proctography to investigate difficult rectal evacuation were studied using a digital imaging system with either a standard digital program for barium examinations, a reduced dose digital program (both with and without additional copper filtration), or Video fluoroscopy. Dose-area products were recorded for each examination and the groups were compared. All four protocols produced technically acceptable examinations. The low-dose program with copper filtration (median dose 382 cGy cm 2 ) and Video fluoroscopy (median dose 705 cGy cm 2 ) were associated with significantly less dose than other groups (p < 0.0001). Patient dose during evacuation proctography can be reduced significantly without compromising the diagnostic quality of the examination. A digital program with added copper filtration conveyed the lowest dose. (orig.)

  20. Optimized dose distribution of a high dose rate vaginal cylinder

    International Nuclear Information System (INIS)

    Li Zuofeng; Liu, Chihray; Palta, Jatinder R.

    1998-01-01

    Purpose: To present a comparison of optimized dose distributions for a set of high-dose-rate (HDR) vaginal cylinders calculated by a commercial treatment-planning system with benchmark calculations using Monte-Carlo-calculated dosimetry data. Methods and Materials: Optimized dose distributions using both an isotropic and an anisotropic dose calculation model were obtained for a set of HDR vaginal cylinders. Mathematical optimization techniques available in the computer treatment-planning system were used to calculate dwell times and positions. These dose distributions were compared with benchmark calculations with TG43 formalism and using Monte-Carlo-calculated data. The same dwell times and positions were used for a quantitative comparison of dose calculated with three dose models. Results: The isotropic dose calculation model can result in discrepancies as high as 50%. The anisotropic dose calculation model compared better with benchmark calculations. The differences were more significant at the apex of the vaginal cylinder, which is typically used as the prescription point. Conclusion: Dose calculation models available in a computer treatment-planning system must be evaluated carefully to ensure their correct application. It should also be noted that when optimized dose distribution at a distance from the cylinder surface is calculated using an accurate dose calculation model, the vaginal mucosa dose becomes significantly higher, and therefore should be carefully monitored

  1. Factores de Risco da Asma Grave

    Directory of Open Access Journals (Sweden)

    N. Adel

    1999-07-01

    doente e família, acesso do doente ao contacto telefónico com o seu médico 24 horas par dia. prescrição de doses adequadas de medicação anti­inflamatória e envio à consulta de Psiquiatria, caso necessária. A aplicação deste programa reduziu consideravelmente o número de internamentos e não houve ocorrência de episódios fatais ou intemamento em un idade de cuidados intensivos. Para além da repercussão na evolução da doença, demonstraram igualmente uma redução drástica nos custos da assistência em internamento hospitalar (5.De salientar ainda a distinção dos dois tipos de asma aguda grave, sendo o tipo 2, também designado asma súbita asfixiante (6, associado a aspectos imunohistológicos diferentes, com maior número de neutrófilos e menor número de eosinófilos nas vias aéreas, em relação aos aspectos clássicos. Segundo Kallenbach e col., quanta mais curto o tempo que medeia o início do ataque de asma e a conexão à ventilação mecânica, maior a probabilidade de setratar de um ataque potencialmente fatal (7Investigações recentes demonstraram ainda que os doentes com asma potencialmente fatal apresentam alteração dos mecanismos de controle da respiração, com diminuição da percepção da dispńeia e uma resposta ventilatória reduzida ao estímulo hipóxico (6,8,9. Palavras-chave: Asma grave, factores de risco, epidemiologia

  2. Progresso Interdisciplinar da Medicina

    Directory of Open Access Journals (Sweden)

    Jorge Correia-Pinto

    2018-02-01

    Full Text Available Portugal é muitas vezes citado como um bom exemplo na prestação de cuidados de saúde. Para tal concorreram a investigação (engenharia biomédica, a evolução técnica e a diferenciação clínica de diferentes especialidades. Para que esta evolução se transfira para o paciente com o seu máximo potencial, o diálogo e a interdisciplinaridade são imprescindíveis. Nesta Edição da Gazeta Médica, vários artigos trazem até ao leitor alguns exemplos desta evolução e interdisciplinaridade, que continua todos os dias nos nossos hospitais. Assim não podemos deixar de salientar o enorme progresso que houve no desenvolvimento de antimicrobianos e logicamente, o desafio que agora enfrentamos, o da resistência aos antibióticos. Por outro lado, a biologia molecular ao permitir-nos conhecer melhor a origem e fisiopatologia de inúmeras doenças, abriu um janela de oportunidade para individualizar o algoritmo clínico de orientação e tratamento clínicos. É com naturalidade, portanto, que a seguir encontramos vários artigos que relatam estratégias de individualização terapêutica, aumentando o efeito terapêutico, e minimizando os efeitos laterais. Sendo o relator deste editorial, um cirurgião, não posso deixar de dar enfoque à forma como a cirurgia minimamente invasiva tem revolucionado a intervenção cirúrgica. A história reporta-nos que foram os urologistas e os ginecologistas os pioneiros em muitos dos passos determinantes para chegarmos à cirurgia laparoscópica. Aqueles e os cirurgiões digestivos documentaram clinicamente que o desenvolvimento da cirurgia minimamente invasiva trouxe consigo várias vantagens que, resumidamente, resultam numa convalescença pós-operatória mais suave e mais curta. Inspirado pelos benefícios bem documentados de cirurgia minimamente invasiva em adultos e crianças, o século XXI começou com as primeiras tentativas de transportar as vantagens desta abordagem para recém-nascidos, tal

  3. Internal dose assessment data management system for a large population of Pu workers

    International Nuclear Information System (INIS)

    Bertelli, L.; Miller, G.; Little, T.; Guilmette, R.A.; Glasser, S.M.

    2007-01-01

    This paper describes the design and implementation of the Los Alamos National Laboratory (LANL) dose assessment (DA) data system. Dose calculations for the most important radionuclides at LANL, namely plutonium, americium, uranium and tritium, are performed through the Microsoft Access DA database. DA includes specially developed forms and macros that perform a variety of tasks, such as retrieving bioassay data, launching the FORTRAN internal dosimetry applications and displaying dose results in the form of text summaries and plots. The DA software involves the following major processes: (1) downloading of bioassay data from a remote data source, (2) editing local and remote databases, (3) setting up and carrying out internal dose calculations using the UF code or the ID code, (3) importing results of the dose calculations into local results databases, (4) producing a secondary database of 'official results' and (5) automatically creating and e-mailing reports. The software also provides summary status and reports of the pending DAs, which are useful for managing the cases in process. (authors)

  4. Dose gradient curve: A new tool for evaluating dose gradient.

    Science.gov (United States)

    Sung, KiHoon; Choi, Young Eun

    2018-01-01

    Stereotactic radiotherapy, which delivers an ablative high radiation dose to a target volume for maximum local tumor control, requires a rapid dose fall-off outside the target volume to prevent extensive damage to nearby normal tissue. Currently, there is no tool to comprehensively evaluate the dose gradient near the target volume. We propose the dose gradient curve (DGC) as a new tool to evaluate the quality of a treatment plan with respect to the dose fall-off characteristics. The average distance between two isodose surfaces was represented by the dose gradient index (DGI) estimated by a simple equation using the volume and surface area of isodose levels. The surface area was calculated by mesh generation and surface triangulation. The DGC was defined as a plot of the DGI of each dose interval as a function of the dose. Two types of DGCs, differential and cumulative, were generated. The performance of the DGC was evaluated using stereotactic radiosurgery plans for virtual targets. Over the range of dose distributions, the dose gradient of each dose interval was well-characterized by the DGC in an easily understandable graph format. Significant changes in the DGC were observed reflecting the differences in planning situations and various prescription doses. The DGC is a rational method for visualizing the dose gradient as the average distance between two isodose surfaces; the shorter the distance, the steeper the dose gradient. By combining the DGC with the dose-volume histogram (DVH) in a single plot, the DGC can be utilized to evaluate not only the dose gradient but also the target coverage in routine clinical practice.

  5. Determination of organ doses and effective doses in radiooncology

    International Nuclear Information System (INIS)

    Roth, J.; Martinez, A.E.

    2007-01-01

    Background and Purpose: With an increasing chance of success in radiooncology, it is necessary to estimate the risk from radiation scatter to areas outside the target volume. The cancer risk from a radiation treatment can be estimated from the organ doses, allowing a somewhat limited effective dose to be estimated and compared. Material and Methods: The doses of the radiation-sensitive organs outside the target volume can be estimated with the aid of the PC program PERIDOSE developed by van der Giessen. The effective doses are determined according to the concept of ICRP, whereby the target volume and the associated organs related to it are not taken into consideration. Results: Organ doses outside the target volume are generally < 1% of the dose in the target volume. In some cases, however, they can be as high as 3%. The effective doses during radiotherapy are between 60 and 900 mSv, depending upon the specific target volume, the applied treatment technique, and the given dose in the ICRU point. Conclusion: For the estimation of the radiation risk, organ doses in radiooncology can be calculated with the aid of the PC program PERIDOSE. While evaluating the radiation risk after ICRP, for the calculation of the effective dose, the advanced age of many patients has to be considered to prevent that, e.g., the high gonad doses do not overestimate the effective dose. (orig.)

  6. Os limites da competitividade

    Directory of Open Access Journals (Sweden)

    Henrique Rattner

    2009-08-01

    Full Text Available

    Costuma-se destacar os aspectos aparentemente positivos e as vantagens hipotéticas da concorrência e da competitividade entre empresas e também entre nações. Não se pode negar que a concorrência nos mercados tenha exercido uma função central e fundamental na gênese e na expansão do sistema de produção capitalista. Ela contribuiu para a geração e acumulação de riquezas materiais. Também estimulou e fortaleceu as aspirações de seus principais atores sociais, os empreendedores, de exigir uma organização política mais democrática em oposição ao regime feudal ou absolutista, em determinado período da história do mundo ocidental.

  7. Engenharia da mente

    OpenAIRE

    Bueno, Tânia Cristina D'Agostini

    2005-01-01

    Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção. Na era da informação digitalizada, pesquisadores de diferentes áreas do conhecimento enfrentam uma nova questão: a organização semântica dos dados. A matéria tornou-se importante pelo fato das informações digitalmente disponíveis estarem dispostas, em sua maioria, como dados não-estruturados. Todavia, sabe-se que a estruturação de dados é um problema complexo ...

  8. Em favor da talassografia

    Directory of Open Access Journals (Sweden)

    Jean-Louis Boudou

    2001-01-01

    Full Text Available A Talassografia (“descrição do mar” interessa-sepelos impactos físicos, biológicos, ecológicos... culturais da violenta antropização dos ambientes costeiros (oceânicos e continentais, caracterizados pelaexigüidade, vulnerabilidade, fragilidade e plasticidade. Como o Brasil é um “país marítimo”, os geó-grafos (os talassógrafos brasileiros são convidadosa intensificar suas pesquisas nas áreas costeiras e acriar novas estruturas para divulgá-las: Revista, Encontros, Associação, Pós-Graduação... tudo em prolda talassografia.

  9. Intercomparison On Depth Dose Measurement

    International Nuclear Information System (INIS)

    Rohmah, N; Akhadi, M

    1996-01-01

    Intercomparation on personal dose evaluation system has been carried out between CSRSR-NAEA of Indonesia toward Standard Laboratory of JAERI (Japan) and ARL (Australia). The intercomparison was in 10 amm depth dose measurement , Hp (10), from the intercomparison result could be stated that personal depth dose measurement conducted by CSRSR was sufficiently good. Deviation of dose measurement result using personal dosemeter of TLD BG-1 type which were used by CSRSR in the intercomparison and routine photon personal dose monitoring was still in internationally agreed limit. Maximum deviation of reported doses by CSRSR compared to delivered doses for dosemeter irradiation by JAERI was -10.0 percent and by ARL was +29 percent. Maximum deviation permitted in personal dose monitoring is ± 50 percent

  10. Dose-to-man studies

    International Nuclear Information System (INIS)

    Anon.

    1976-01-01

    Dose-to-Man Studies focused on developing computer data handling and computer modules which permit easy, rapid assessment of the dose to southeastern United States populations from routine or accidental releases of radionuclides to atmospheric and stream systems

  11. Dose monitoring in nuclear emergency

    International Nuclear Information System (INIS)

    Nan Hongjie; Yang Zhongping; Lei Xin

    2012-01-01

    In order to protect people from irradiation sickness and rebuild the radiation filed in nuclear emergency, personal and environmental dose need to be monitored. The application of TLD in dose monitoring is discussed in this paper. (authors)

  12. A review of radiology staff doses and dose monitoring requirements

    International Nuclear Information System (INIS)

    Martin, C. J.

    2009-01-01

    Studies of radiation doses received during X-ray procedures by radiology, cardiology and other clinical staff have been reviewed. Data for effective dose (E), and doses to the eyes, thyroid, hands and legs have been analysed. These data have been supplemented with local measurements to determine the most exposed part of the hand for monitoring purposes. There are ranges of 60-100 in doses to individual tissues reported in the literature for similar procedures at different centres. While ranges in the doses per unit dose-area product (DAP) are between 10 and 25, large variations in dose result from differences in the sensitivity of the X-ray equipment, the type of procedure and the operator technique, but protection factors are important in maintaining dose levels as low as possible. The influence of shielding devices is significant for determining the dose to the eyes and thyroid, and the position of the operator, which depends on the procedure, is the most significant factor determining doses to the hands. A second body dosemeter worn at the level of the collar is recommended for operators with high workloads for use in assessment of effective dose and the dose to the eye. It is proposed that the third quartile values from the distributions of dose per unit DAP identified in the review might be employed in predicting the orders of magnitude of doses to the eye, thyroid and hands, based on interventional operator workloads. Such dose estimates could be employed in risk assessments when reviewing protection and monitoring requirements. A dosemeter worn on the little finger of the hand nearest to the X-ray tube is recommended for monitoring the hand. (authors)

  13. Efeito de diferentes doses de flavonóides em ratos hiperlipidêmicos

    Directory of Open Access Journals (Sweden)

    OLIVEIRA Tania Toledo de

    2002-01-01

    Full Text Available O objetivo deste estudo foi avaliar o efeito de diferentes doses de baicaleína, morina, naringenina, naringina, quercetina e rutina no aumento dos níveis de colesterol-HDL e trigliceróis em ratos hiperlipidêmicos. Tais flavonóides foram administrados em 3 doses (5, 10, 15 mg/animal a ratos machos da raça Wistar, com 30 dias de vida, alimentados com dieta não purificada de fórmula da marca Labina®. A hiperlipidemia foi induzida pela administração de Triton, na dose de 300 mg/kg de peso vivo. Após 24 horas, os flavonóides foram administrados, sendo cada dose aplicada em grupos de 8 animais. Após 48 horas da aplicação do Triton, os animais foram anestesiados e, por punção cardíaca, amostras de sangue foram coletadas para realização das análises de colesterol, colesterol-HDL e triacilgliceróis no soro. Os melhores resultados para a redução do colesterol foram obtidos com os flavonóides quercetina e rutina, na dose de 5 mg, e naringenina, na dose de 10 mg. A baicaleína, nas doses de 5 e 10 mg, foi a que apresentou as menores reduções para colesterol-HDL. Já para as concentrações de triacilgliceróis, a baicaleína foi a que mais reduziu este parâmetro, independentemente da dose utilizada.

  14. ANÁLISE PRELIMINAR DA CONTROLADORIA DA CIDADE DE SALVADOR

    Directory of Open Access Journals (Sweden)

    João Marcelo Pitiá Barreto

    2012-06-01

    Full Text Available A Controladoria tem sido alvo de estudos e destaque de análises e reflexões dos estudiosos das ciências que têm como foco o campo gerencial das organizações como a da Administração e Contabilidade. É importante observar a contribuição da Controladoria à governança pública, fundamento de uma gestão democrática e participativa. Nesse contexto, insere-se o objetivo deste estudo, refletir sobre atuação da controladoria pública da cidade de Salvador, observando a contribuição efetiva na governança nesse município. Os estudos foram desenvolvidos na Secretaria da Fazenda (SEFAZ do município a quem Controladoria vincula-se. Com caráter exploratório, essa investigação descritiva envolveu pesquisa de campo, análise de documentos e relatórios emitidos pela SEFAZ e pelo Tribunal de Contas do Município (TCM. Verificou-se o organograma da SEFAZ, seu orçamento e os pareceres do TCM. Os resultados expressam a importância da Controladoria e denotam a impressão de que, na instituição estudada, essa área não esteja cumprindo bem seu papel. 

  15. Ocorrência da ferrugem da videira em Minas Gerais

    Directory of Open Access Journals (Sweden)

    Adelica Aparecida Xavier

    2012-03-01

    Full Text Available A ferrugem da videira causada por Phakopsora euvitis Ono constitui-se numa ameaça às regiões produtoras de uva em função do potencial destrutivo da planta. A doença foi detectada no Brasil, pela primeira vez, em 2001. Atualmente, ela ocorre no Paraná, Mato Grosso do Sul, São Paulo, Rio Grande do Sul, Mato Grosso, Roraima, Espírito Santo e Santa Catarina. Em abril de 2010, observaram-se na estação experimental da Unimontes, Janaúba, Minas Gerais, plantas da cv. Niágara rosada com sintomas típicos da doença. A análise dos sintomas e a caracterização dos urediniósporos sésseis, levemente equinulados, com formato oval, ou elipsoide formado em urédias subepidérmicas na origem, inrompentes e com paráfises circundantes dorsalmente, levaram à diagnose de Phakopsora euvitis como o agente causal da doença. Este é o primeiro relato da doença no Estado de Minas Gerais.

  16. Dose. Detriment. Limit assessment

    International Nuclear Information System (INIS)

    Breckow, J.

    2015-01-01

    One goal of radiation protection is the limitation of stochastic effects due to radiation exposure. The probability of occurrence of a radiation induced stochastic effect, however, is only one of several other parameters which determine the radiation detriment. Though the ICRP-concept of detriment is a quantitative definition, the kind of detriment weighting includes somewhat subjective elements. In this sense, the detriment-concept of ICRP represents already at the stage of effective dose a kind of assessment. Thus, by comparing radiation protection standards and concepts interconvertible or with those of environment or occupational protection one should be aware of the possibly different principles of detriment assessment.

  17. Radon dose and aerosols

    International Nuclear Information System (INIS)

    Planinic, J.; Radolic, V.; Faj, Z.; Vukovic, B.

    2000-01-01

    The equilibrium factor value (F) was measured in the NRPB radon chamber and the corresponding track density ratio (r = D/D 0 ) of bare (D) and diffusion (D 0 ) LR-115 nuclear track detectors was determined, as well as the regression equation F(r). Experiments with LR-115 nuclear track detectors and aerosol sources (burning candle and cigarette) were carried out in the Osijek University radon chamber and afterwards an empirical relationship between the equilibrium factor and aerosol concentration was derived. For the purpose of radon dose equivalent assessment, procedures for determining the unattached fraction of radon progeny were introduced using two nuclear track detectors. (author)

  18. Hanford Environmental Dose Reconstruction Project

    International Nuclear Information System (INIS)

    Cannon, S.D.; Finch, S.M.

    1992-10-01

    The objective of the Hanford Environmental Dose Reconstruction (HEDR) Project is to estimate the radiation doses that individuals and populations could have received from nuclear operations at Hanford since 1944. The independent Technical Steering Panel (TSP) provides technical direction. The project is divided into the following technical tasks. These tasks correspond to the path radionuclides followed from release to impact on humans (dose estimates):Source Terms, Environmental Transport, Environmental Monitoring Data, Demography, Food Consumption, and Agriculture, and Environmental Pathways and Dose Estimates

  19. Effective dose and dose to crystalline lens during angiographic procedures

    International Nuclear Information System (INIS)

    Pages, J.

    1998-01-01

    The highest radiation doses levels received by radiologists are observed during interventional procedures. Doses to forehead and neck received by a radiologist executing angiographic examinations at the department of radiology at the academic hospital (AZ-VUB) have been measured for a group of 34 examinations. The doses to crystalline lens and the effective doses for a period of one year have been estimated. For the crystalline lens the maximum dose approaches the ICRP limit, that indicates the necessity for the radiologist to use leaded glasses. (N.C.)

  20. Historicidade da filosofia em Hegel e Heidegger

    OpenAIRE

    Christian Iber

    2017-01-01

    Gostaria de discutir, em forma de teses, a temática da historicidade da filosofia em contraste e na sua divergência em Hegel e Heidegger. Diferente do historicismo, que não soluciona o problema da historicidade da filosofia, porque ele dissolve tendencialmente a filosofia na história da filosofia e não coloca em especial a questão da verdade, Hegel e Heidegger desenvolvem uma teoria genuinamente filosófica da história da filosofia do interesse filosófico pela verdade. Esse interesse genuiname...

  1. Modelo para sistemas da qualidade como base da estrategia competitiva

    OpenAIRE

    Marco Antonio Silveira

    1999-01-01

    Resumo: Vários autores propõem a empresa como um sistema em transformação, sendo que esse enfoque sistêmico parece oferecer um meio efetivo de prover as capacidades estratégicas que são valorizadas pelos mercados atuais. Por outro lado, vem crescendo a consciência para o enfoque da qualidade como base da estratégia competitiva, onde esta é associada à lucratividade e incluída no processo de planejamento estratégico, tornando-se um instrumento eficaz de concorrência que, para fazer frente à di...

  2. Dimensão da maturidade à luz da logoterapia

    Directory of Open Access Journals (Sweden)

    Libardi, Tadeu Antonio

    2008-01-01

    Full Text Available O artigo aborda o tema da maturidade humana à luz da logoterapia, fundada por Viktor Emil Frankl. Nos dias de hoje, existe a frustração existencial, não mais a sexual, como analisada por Freud. Cada ser humano, como pessoa livre e responsável e tendo como meta a busca da maturidade, vai percorrendo seu próprio caminho, que o leva à ceitação de si, de seus limites e potencialidades e ao relacionamento social e religioso, capacitando-o ao confronto com o sofrimento humano

  3. Dose planning and dose delivery in radiation therapy

    International Nuclear Information System (INIS)

    Knoeoes, T.

    1991-01-01

    A method has been developed for calibration of CT-numbers to volumetric electron density distributions using tissue substitutes of known elemental composition and experimentally determined electron density. This information have been used in a dose calculation method based on photon and electron interaction processes. The method utilizes a convolution integral between the photon fluence matrix and dose distribution kernels. Inhomogeneous media are accounted for using the theorems of Fano and O'Connor for scaling dose distribution kernels in proportion to electron density. For clinical application of a calculated dose plan, a method for prediction of accelerator output have been developed. The methods gives the number of monitor units that has to be given to obtain a certain absorbed dose to a point inside an irregular, inhomogeneous object. The method for verification of dose distributions outlined in this study makes it possible to exclude the treatment related variance contributions, making an objective evaluation of dose calculations with experiments feasible. The methods for electron density determination, dose calculation and prediction of accelerator output discussed in this study will all contribute to an increased accuracy in the mean absorbed dose to the target volume. However, a substantial gain in the accuracy for the spatial absorbed dose distribution will also follow, especially using CT for mapping of electron density together with the dose calculation algorithm. (au)

  4. Normal tissue dose-effect models in biological dose optimisation

    International Nuclear Information System (INIS)

    Alber, M.

    2008-01-01

    Sophisticated radiotherapy techniques like intensity modulated radiotherapy with photons and protons rely on numerical dose optimisation. The evaluation of normal tissue dose distributions that deviate significantly from the common clinical routine and also the mathematical expression of desirable properties of a dose distribution is difficult. In essence, a dose evaluation model for normal tissues has to express the tissue specific volume effect. A formalism of local dose effect measures is presented, which can be applied to serial and parallel responding tissues as well as target volumes and physical dose penalties. These models allow a transparent description of the volume effect and an efficient control over the optimum dose distribution. They can be linked to normal tissue complication probability models and the equivalent uniform dose concept. In clinical applications, they provide a means to standardize normal tissue doses in the face of inevitable anatomical differences between patients and a vastly increased freedom to shape the dose, without being overly limiting like sets of dose-volume constraints. (orig.)

  5. Determination of {sup 226}Ra by gamma spectrometry: study of packaging vial of sample for analysis; Determinacao de {sup 226}Ra por espectrometria gama: estudo do recipiente de acondicionamento de amostra para analise

    Energy Technology Data Exchange (ETDEWEB)

    Carneiro, Andre Cavalcanti

    2015-07-01

    Determination of radioactivity levels of {sup 226}Ra by gamma spectrometry in a sample is based on measurements of {sup 214}Pb and {sup 214}Bi, daughters of {sup 222}Rn. Because radon is a gas, it can leak from the sample vial or accumulate on the upper empty it. If the vial has any crack, there will be loss of gas, which will cause error in determining the {sup 226}Ra concentration. One possible cause of cracks in the vials, that houses standards and samples, is the radiolysis action in the vial material, usually a polymer. As the demand {sup 226}Ra analysis in different matrices (geological samples, food, plants, etc.) is increasing, it was decided to study some polymer vials available on the market, to verify the feasibility to be used when is applied the analysis method using gamma spectrometry. Four types of polymer vials have been studied. The radiation doses in walls of the vials caused by natural radionuclides present in the sample were simulated using gamma irradiation. Tests, such as compressive strength test and tightness, were applied to the irradiated and non-irradiated vials. First, to verify the effect of radiolysis on the vial material and also if there was {sup 222}Rn diffusion in their walls. These preliminary results pointed out that the acrylic vials are the best option of packaging samples for analysis. This study should be repeated in a larger number of samples for a better evaluation. (author)

  6. Hipervitaminose A experimental no rato. I. Estudo cariometrico do epitelio dos tubulos contorcidos proximal distal e alça de Henle do rim de fetos cujas mães foram tratadas com diferentes dosagens de vitamina A. II. Estudo da relação dose-efeito

    OpenAIRE

    Olinda Maria Gomes da Costa Vilas Boas

    1992-01-01

    Resumo: O presente trabalho teve como objetivo caracterizar morfológica e morfométricamente as alterações de volumes nucleares no epitélio dos túbulos contorcidos e alças de Renle, causadas pela hipervitaminose A em rins de fetos de ratas tratadas com diferentes doses de vitamina A. Para tanto, foram utilizados 42 fetos de ratas que, no décimo dia de prenhez receberam, intraperitonealmente, 30.000 VI, 40.000 VI, 50.000 VI, 70.000 VI, 100.000 VI ou 150.000 VI de vitamina A, sob a forma de palm...

  7. Absorbed dose in CT. Comparison by CT dose index

    International Nuclear Information System (INIS)

    Yamamoto, Kenji; Akazawa, Hiroshi; Andou, Takashi

    2002-01-01

    Few reports have discussed the absorbed dose on CT units with increased scanning capacity even with the current widespread adoption of multi-slice CT units. To compare and investigate the dose indexes among CT units, we measured the absorbed dose on CT units operating in Nagano Prefecture Japan. The measurements showed proportionality between phantom absorbed dose and the exposured mAs values in conventional scanning operation. Further, the measurements showed that the absorbed dose in the center of the phantom differed by about 2.1-fold between the highest and lowest levels on individual CT units. Within a single company, multi-slice CT units of the same company gave absorbed doses of about 1.3 to 1.5 times those of conventional single-slice CT units under the same exposured conditions of conventional scanning. When the scanning pitch was reduced in helical scanning, the absorbed dose at the center of the phantom increased. (author)

  8. Simulação do efeito do manejo da palha e do nitrogênio na produtividade da cana-de-açúcar

    Directory of Open Access Journals (Sweden)

    Leandro G. Costa

    2014-05-01

    Full Text Available Propôs-se, com este trabalho, modelar o crescimento e a produtividade da cana-de-açúcar em sistemas de colheita mecanizada avaliando o efeito da remoção da palhada remanescente em combinação com doses de adubação nitrogenada de 60, 120 e 180 kg ha-1. Utilizou-se o modelo APSIM-Sugar calibrado com base em dois experimentos localizados em Piracicaba, SP, e Salinas, MG, conduzidos com a variedade SP80-1842. Avaliou-se a sensibilidade do modelo aos parâmetros de solo e de variedade, em especial aqueles relacionados à dinâmica da matéria orgânica do solo e do nitrogênio. O modelo mostrou-se capaz de descrever adequadamente o crescimento da cana-de-açúcar nos dois ambientes produtivos. As simulações indicaram que a remoção da palha para utilização na indústria acarretaria redução da produtividade no longo prazo e que a elevação na adubação nitrogenada até 180 kg ha-1 não seria suficiente para compensar a queda na produção.

  9. SOJA IAC/IAS-5: CULTIVAR RESISTENTE AO CANCRO DA HASTE

    Directory of Open Access Journals (Sweden)

    MASCARENHAS HIPÓLITO ASSUNÇÃO ANTONIO

    1998-01-01

    Full Text Available Há aproximadamente oito anos, o cancro da haste (Phomopsis phaseoli f. sp. meridionalis/Diaporthe phaseolorum f. sp. meridionalis da soja tem sido o principal fator limitante da produtividade em áreas de manifestação da doença. O seu controle mediante cultivares resistentes é o método mais econômico. Num ensaio em casa de vegetação, visando avaliar o efeito de doses de potássio no controle do cancro da haste, no cultivar IAS-5, moderadamente resistente, verificou-se haver plantas altamente resistentes, comprovadas em três gerações, todas inoculadas com o fungo causador da doença. A importância da obtenção do IAS-5 e de sua multiplicação deve-se a ser o mais cultivado no Estado de São Paulo e apresentar resistência ao cancro da haste.

  10. New recommendations for dose equivalent

    International Nuclear Information System (INIS)

    Bengtsson, G.

    1985-01-01

    In its report 39, the International Commission on Radiation Units and Measurements (ICRU), has defined four new quantities for the determination of dose equivalents from external sources: the ambient dose equivalent, the directional dose equivalent, the individual dose equivalent, penetrating and the individual dose equivalent, superficial. The rationale behind these concepts and their practical application are discussed. Reference is made to numerical values of these quantities which will be the subject of a coming publication from the International Commission on Radiological Protection, ICRP. (Author)

  11. O carnaval da turba futurista

    Directory of Open Access Journals (Sweden)

    Ana Paula Freitas de Andrade

    2017-11-01

    Full Text Available O artigo trata da repercussão do futurismo italiano no Brasil, a partir da análise de crônicas de Menotti Del Picchia publicadas no Correio Paulistano, entre 1920 e 1922. Nessa época o escritor participou da polêmica sobre a vanguarda italiana veiculada na imprensa paulistana, publicando uma série de crônicas que, ao promover ideias futuristas e criticar a literatura passadista, estabelecem a formulação de um futurismo compósito, adaptado à realidade brasileira; e esboçam as principais teses do movimento modernista.

  12. Evapotranspiração da cultura da cebola

    Directory of Open Access Journals (Sweden)

    G. M. Oliveira

    2015-10-01

    Full Text Available A determinação da quantidade de água necessária para as culturas é um dos principais fatores para o correto planejamento, dimensionamento e manejo de qualquer sistema de irrigação. O presente trabalho teve como objetivo, comparar medida da evapotranspiração da cultura (ETc da cebola com estimativa obtida a partir da evapotranspiração de referência (ETo determinada por diferentes métodos e Kc proposto na literatura. O experimento foi conduzido no campo experimental do Departamento de Tecnologia e Ciências Sociais da Universidade do Estado da Bahia - UNEB, em Juazeiro, no período de junho a setembro de 2011. As medidas da ETc foram obtidas em evapotranspirômetros e as estimativas, a partir de ETo determinada pelos métodos: Penman-Monteith (padrão FAO, Penman-Monteith modificado por Villa Nova et al. (2004, Hargreaves & Samani, Makkink e Jensen & Haise e Kc proposto por Marouelli et al. (2005, para a cultura da cebola. É fundamental a avaliação de métodos de estimativa da evapotranspiração de referência antes de sua aplicação, pois erros consideráveis podem ser cometidos na determinação da quantidade de água a ser aplicada a uma cultura, o que repercutirá certamente, na produtividade.Evapotranspiration crop onionAbstract: The determination of the amount of water needed for crops is a major factor for the correct planning, sizing and management of any irrigation system. This study aimed to compare measure of crop evapotranspiration (ETc onion with estimates obtained from the reference evapotranspiration (ETo determined by different methods and Kc proposed in the literature. The experiment was conducted in the experimental field of the Department of Technology and Social Sciences, University of the State of Bahia, in Juazeiro, from June to September 2011. The ETc measurements were obtained in evapotranspirometers and estimates, from ETo determined by the methods: Penman-Monteith (FAO standard, Penman-Monteith modified

  13. DA-9701 on gastric motility in patients with Parkinson's disease: A randomized controlled trial.

    Science.gov (United States)

    Shin, Cheol Min; Lee, Yoon Jin; Kim, Jong-Min; Lee, Jee Young; Kim, Kyung-Joon; Choi, Yoon Jin; Kim, Nayoung; Lee, Dong Ho

    2018-04-21

    To evaluate the effect of DA-9701, a novel prokinetic drug, on gastric motility evaluated by magnetic resonance imaging in patients with Parkinson's disease (PD). Forty PD patients were randomly allocated to receive either domperidone or DA-9701. Their gastric functions were evaluated using magnetic resonance imaging before and after 4-week treatment period. Information on levodopa daily dose, disease duration, and Unified PD Rating Scale scores was collected. In 18 patients (domperidone: 9, DA-9701: 9), plasma levodopa concentrations were determined. Primary outcome was assessed by a one-sided 95% confidence interval to show non-inferiority of DA-9701 vs. domperidone with a pre-determined non-inferiority margin of -10%. Thirty-eight participants (19 men and 19 women; mean age, 67.1 years) completed the study protocol (domperidone: DA-9701 = 19:19). Gastric emptying rate at 120 min (2-hr GER) was comparable between the 2 groups; it was not correlated with levodopa daily dose or disease duration or Unified PD Rating Scale scores (all p > 0.05). DA-9701 was not inferior to domperidone in changes of 2-hr GERs before and after the treatment (absolute difference, 4.0 %; one-sided 95% confidence interval, - 3.7 to infinity). However, a significant increase in 2-hr GER was observed only in DA-9701 group (54.5% and 61.8%, before and after treatment, respectively, p DA-9701 group. There were neither adverse reactions nor deteriorations of parkinsonian symptoms observed in the study participants. DA-9701 can be used for the patients with PD to enhance gastric motility without aggravating PD symptoms (ClinicalTrials.gov number: NCT03022201). Copyright © 2018 Elsevier Ltd. All rights reserved.

  14. Dos Males da Medida

    Directory of Open Access Journals (Sweden)

    Lilia Moritz Schwarcz

    1997-01-01

    Full Text Available Esse artigo tem como objeto a difícil percepção da "diferença". Tema polêmico, o debate sobre as variedades culturais foi transformado, em meados do século XIX, em uma questão racial e, nesse sentido, vinculado às regularidades da biologia. Tecendo comparações entre os teóricos raciais brasileiros e os impasses mais contemporâneos, sobre a aferição de inteligência e capacidade, esse ensaio pretende provocar. Em pauta estarão as contradições que têm se destacado, mais recentemente, quando se opõem de um lado as etnicidades locais, de outro a tão propalada globalização. Tal qual dois lados de uma mesma moeda, a afirmação de identidades tem se mostrado tão evidente como o próprio estreitamento das relações internacionais. Mudam os termos do debate - de raça, para etnia -, mas, de alguma maneira, continuamos presos a uma lógica positiva de estabelecimento de hierarquias ontológicas.This article has as its objective the difficult perception of "difference". A controversial theme, in the nineteenth century, this debate on cultural varieties, became a racial issue and in this sense, bonded to the regularities of biology. In such a context, this essay intends to provoke comparisons about the standard measure of intelligence and capacity, between Brazilian racial theorists and the impasse of more contemporary times. Appointed here will be the contradictions which have, more recently grown in importance, and have opposed through one aspect, local ethnic groups and through another the greatly publicized globalization. As are the two sides of a coin, the affirmation of identities has shown itself as evident as the tightening of international relations. The terms of the debate change from race to ethnicism, but in some way, we are still tied to a positivist logic which establishes ontologic hierarchies.

  15. Neutron activation analysis applied to the determination of trace elements in human nails; Aplicacao do metodo de analise por ativacao com neutrons a determinacao de elementos traco em unhas humanas

    Energy Technology Data Exchange (ETDEWEB)

    Aguiar, Amilton Reinaldo

    2001-07-01

    There is a considerable interest in the determination of trace elements in human nails in order to use this tissue as a monitor of nutritional and healthy status of individuals, of occupational exposure diseases and of the environmental contamination. In this work, instrumental neutron activation analysis was applied to determine trace elements in finger nail clippings to make comparisons between the elemental concentrations obtained in nails from healthy individuals of a control group and those from cystic fibrosis (CF) patients. Firstly, a protocol for sample collection and preparation for analysis was established. Finger and toe nail samples from CF patients were collected at the Instituto da Crianca of Medicine School, University of Sao Paulo, SP. The nail samples from control group were collected from healthy adults and from children living in Sao Paulo city, SP. These samples were cleaned by stirring them witha a diluted Triton X100 solution and then by washing with distilled water and acetone. The analytical procedure consisted of irradiation nail samples and elemental standards in the IEA-R1m nuclear reactor under thermal neutro flux of about 10{sup 12} n cm{sup -2} s{sup -1}, for short and long period irradiations. The activities of the radionuclides were measured using a gamma-ray spectrometer comprising an hyperpure Ge detector and associated electronic system. The biological reference materials Bovine Liver 1577b and Oyster Tissue 1566a, both from National Institute of Standards and Technology, USA were analysed in order to evaluate the accuracy and precision of the results. The analysis of variance (ANOVA) and F-test at the significance level of 5% were used to make a comparison between the sets of results obtained in this work. In the comparison of the results obtained for finger and toe nails from CF patients, the Br concentrations were higher in finger nails that those obtained for toe nails. For the control group of children, the finger nails

  16. Integral dose conservation in radiotherapy

    International Nuclear Information System (INIS)

    Reese, Adam S.; Das, Shiva K.; Curle, Charles; Marks, Lawrence B.

    2009-01-01

    Treatment planners frequently modify beam arrangements and use IMRT to improve target dose coverage while satisfying dose constraints on normal tissues. The authors herein analyze the limitations of these strategies and quantitatively assess the extent to which dose can be redistributed within the patient volume. Specifically, the authors hypothesize that (1) the normalized integral dose is constant across concentric shells of normal tissue surrounding the target (normalized to the average integral shell dose), (2) the normalized integral shell dose is constant across plans with different numbers and orientations of beams, and (3) the normalized integral shell dose is constant across plans when reducing the dose to a critical structure. Using the images of seven patients previously irradiated for cancer of brain or prostate cancer and one idealized scenario, competing three-dimensional conformal and IMRT plans were generated using different beam configurations. Within a given plan and for competing plans with a constant mean target dose, the normalized integral doses within concentric ''shells'' of surrounding normal tissue were quantitatively compared. Within each patient, the normalized integral dose to shells of normal tissue surrounding the target was relatively constant (1). Similarly, for each clinical scenario, the normalized integral dose for a given shell was also relatively constant regardless of the number and orientation of beams (2) or degree of sparing of a critical structure (3). 3D and IMRT planning tools can redistribute, rather than eliminate dose to the surrounding normal tissues (intuitively known by planners). More specifically, dose cannot be moved between shells surrounding the target but only within a shell. This implies that there are limitations in the extent to which a critical structure can be spared based on the location and geometry of the critical structure relative to the target.

  17. SOBRE OS FUNDAMENTOS DA ARQUITETURA DA INFORMAÇÃO

    Directory of Open Access Journals (Sweden)

    Alfram Roberto Rodrigues de Albuquerque

    2011-10-01

    Full Text Available Expõe-se o estado atual da disciplina Arquitetura da Informação quanto a problemática terminológica da definição do campo de estudo, apresentando-se argumentos para uma definição de Arquitetura da Informação de uma forma ampla na qual os usos correntes dessa expressão sejam vistos como especializações. Defende-se uma definição com a utilização de um conjunto de propriedades mínimas cujas interações levam a uma terminologia formal e cuja abstração leva a uma definição formal do conceito que emprega a linguagem de morfismos da Teoria das Categorias. Trata-se de um recorte de alguns dos resultados obtidos na tese de doutoramento de um dos autores, defendida em setembro de 2010. O contexto da pesquisa é exposto e alguns dos resultados obtidos são delineados.

  18. O sentido da espiritualidade na transitoriedade da vida

    Directory of Open Access Journals (Sweden)

    Isabel Cristina de Oliveira Arrieira

    Full Text Available Resumo Objetivo: Compreender o sentido da espiritualidade para a pessoa em cuidados paliativos. Métodos: Abordagem qualitativa, fundamentada na fenomenologia existencialista e referencial de Viktor Frankl. Os participantes foram nove pessoas em cuidados paliativos atendidas no domicílio. Informações coletadas por meio da observação e de entrevista realizadas no período de junho a outubro de 2014, gravadas, transcritas e transformadas em texto interpretado com a abordagem fenomenológica hermenêutica. Resultados: Surgiram as seguintes categorias: sentido de continuidade da vida; sentido de alívio do sofrimento; sentido de naturalidade da morte e sentido de valorização do viver. Conclusão: Para a integralidade da atenção faz-se necessário a inclusão da espiritualidade na prática do cuidado em saúde. A espiritualidade proporciona o encontro existencial entre a pessoa em cuidados paliativos e os profissionais que a cuidam em sua integralidade.

  19. O uso da aromaterapia na melhora da autoestima

    Directory of Open Access Journals (Sweden)

    Juliana Rizzo Gnatta

    2011-10-01

    Full Text Available Os objetivos deste estudo foram verificar se a inalação dos óleos essenciais de rosa e de ylang-ylang alteram a percepção da autoestima e comparar a eficácia dos mesmos. O projeto foi aprovado pelo Comitê de Ética em Pesquisa do Hospital da Universidade de São Paulo. Participaram 43 funcionários dos setores de Higienização e da Central de Materiais e Esterilização durante os meses de maio a julho de 2009. Os sujeitos foram randomizados em três grupos: dois que receberem os óleos essenciais e outro que recebeu placebo (essência de rosa. A avaliação da autoestima foi feita através de uma escala já validada no Brasil, sendo aplicada antes do uso dos aromas, depois de 30 dias de uso e ao completar 60 dias. Dentre os resultados, verificou-se que a amostra era constituída por 88,6% de indivíduos com média e alta autoestima e que os óleos essenciais em questão não alteraram de forma significativa a percepção da autoestima.

  20. A utilização da teoria da aprendizagem significativa no ensino da Enfermagem

    Directory of Open Access Journals (Sweden)

    Alana Tamar Oliveira de Sousa

    2015-08-01

    Full Text Available RESUMOObjetivo:sintetizar a produção científica acerca da Teoria da Aprendizagem Significativa no processo de ensino-aprendizagem em Enfermagem.Método:revisão integrativa realizada nas bases de dados MEDLINE, LILACS, SciELO, BDENF e CINAHL, com artigos que abordaram a temática ou aspectos da teoria da aprendizagem significativa de David Ausubel. Fizeram parte da amostra dez artigos, sendo seis escritos no idioma português e quatro no inglês, publicados de 1998 a 2013.Resultados:cinco artigos fizeram alusão à Teoria da Aprendizagem Significativa, quatro citaram Ausubel como autor dessa teoria e apenas dois seguiram a estrutura para a aplicação da teoria completamente. Há escassez de estudos sobre o tema e os que o abordam não o correlacionam com a teoria de Ausubel.Conclusão:faz-se necessário romper com a dicotomia entre teoria e prática e promover a articulação dos conteúdos com a ação, introduzindo o aluno como autor de seu próprio conhecimento.

  1. Patient dose measurement and dose reduction in East Anglia (UK)

    International Nuclear Information System (INIS)

    Wade, J.P.; Goldstone, K.E.; Dendy, P.P.

    1995-01-01

    At the end of 1990 a programme of patient dose measurements was introduced as part of the quality assurance service already provided for X ray departments throughout the East Anglian Health Region (UK). Thermoluminescence dosemeters (TLDs) were used to measure over 1200 skin entrance surface doses for four common radiographic views in 33 hospitals in both the NHS and private sector. The four views were chosen to cover a wide range of equipment and techniques. The data collected have enabled Regional reference doses to be set which, for all views considered, fall below the National Radiological Protection Board (NRPB) Reference levels. In departments which exceeded reference levels, techniques were reviewed, improvements suggested and doses re-measured, in accordance with the recommended procedure for patient dose audit. A significant finding was that, given appropriate controls, X ray departments in the private sector could achieve the same acceptably low doses as NHS departments. (Author)

  2. Da janela do meu quarto

    Directory of Open Access Journals (Sweden)

    Esther Hamburger

    2008-12-01

    Full Text Available O texto aborda o curta Da Janela do Meu Quarto de Cao Guimarães como contraponto a filmes brasileiros recentes que lidam com a desigualdade social brasileira na chave da violência. O texto contrasta o distanciamento imposto pelo posicionamento de câmera e efeitos de montagem e som nesse filme, com o uso de estratégias de pertencimento e apropriação presentes em filmes "de resultado".

  3. Da janela do meu quarto

    OpenAIRE

    Hamburger, Esther

    2008-01-01

    O texto aborda o curta Da Janela do Meu Quarto de Cao Guimarães como contraponto a filmes brasileiros recentes que lidam com a desigualdade social brasileira na chave da violência. O texto contrasta o distanciamento imposto pelo posicionamento de câmera e efeitos de montagem e som nesse filme, com o uso de estratégias de pertencimento e apropriação presentes em filmes "de resultado".

  4. Methodology of the {sup 137} Cs for the soil erosion and deposition determination in a micro basin from the north of Parana State; Metodologia do {sup 137} Cs para determinacao da erosao e deposicao de solo em uma microbacia do norte do Parana

    Energy Technology Data Exchange (ETDEWEB)

    Andrello, Avacir Casanova

    1997-12-31

    The measurement of {sup 137} Cs redistribution in the field allows the determination of soil erosion/accumulation. The {sup 137} Cs activity of soil samples, taken from a small basin at the North of Parana, were measured employing a HPGe gamma ray detector and a standard spectrometric nuclear electronic chain. Standard oil samples with known concentrations of {sup 137} Cs were prepared for the detection efficiency determination. Soil loss or gain was measured at the top, midslope and low slope regions, for six different transects at the investigated small basin. (author) 47 refs., 31 figs., 11 tabs.

  5. Development and validation of analytical methodology for determination of polycyclic aromatic hydrocarbons (PAHS) in sediments. Assesment of Pedroso Park dam, Santo Andre, SP; Desenvolvimento e validacao de metodologia analitica para determinacao de hidrocarbonetos policiclicos aromaticos (HPAS) em sedimentos. Avaliacao da represa do Parque Pedroso, Santo Andre, SP

    Energy Technology Data Exchange (ETDEWEB)

    Brito, Carlos Fernando de

    2009-07-01

    The polycyclic aromatic hydrocarbons (PAHs), by being considered persistent contaminants, by their ubiquity in the environment and by the recognition of their genotoxicity, have stimulated research activities in order to determine and evaluate their sources, transport, processing, biological effects and accumulation in compartments of aquatic and terrestrial ecosystems. In this work, the matrix studied was sediment collected at Pedroso Park's dam at Santo Andre, SP. The analytical technique employed was liquid chromatography in reverse phase with a UV/Vis detector. Statistics treatment of the data was established during the process of developing the methodology for which there was reliable results. The steps involved were evaluated using the concept of Validation of Chemical Testing. The parameters selected for the analytical validation were selectivity, linearity, Working Range, Sensitivity, Accuracy, Precision, Limit of Detection, Limit of quantification and robustness. These parameters showed satisfactory results, allowing the application of the methodology, and is a simple method that allows the minimization of