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Sample records for dosimetros personales tld-100

  1. Mensuration of equivalent dose with personal dosemeters and instruments of radiological protection in the new operative quantities ICRU, for external fields of beta radiation. Part II. I study of the angular response of personal dosemeters TLD-100 in secondary patron fields of beta radiation ({sup 90}Sr / {sup 90}Y); Medicion de dosis equivalente con dosimetros personales e instrumentos de proteccion radiologica en las nuevas magnitudes operativas ICRU, para campos de radiacion beta externos. Parte II. Estudio de la respuesta angular de dosimetros personales TLD-100 en campos patrones secundarios de radiacion beta ({sup 90}Sr/{sup 90}Y)

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    Alvarez R, J.T. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    1994-01-15

    The objective of this work is to carry out one of the possible ones test type for personal dosemeters TLD, under the recomendations of the ICRU 39, ICRU 43 and the draft of the norm ISO 6980,(1992), with the purpose of verifying the capacity of these detectors to carry out the operative unit: H' (0.07;{alpha}). Since H' (O. 07;{alpha}) this defined one in an expanded field, one of these tests type consist on determining the angular response of these detectors. 20 personal dosemeters TLD-100 was used, (card marks: Harshaw, Model: G-1, with two glasses of TLD-100 absorbed in teflon; the portadosemeters has two windows, a free one and another with a filter of Pb of 171.0 mg cm{sup -2}); these dosemeters they were previously selected, [to see, {sup S}tudy of the Homogeneity of the response of Personal Dosemeters (Cards G-l, TLD-100) in Radiation of Countrysides of {sup 60}Co{sup ,} J.T. Alvarez R. Technician Report GSR/IT/0001/94].The irradiations to effectued in secondary countryside of radiation beta of {sup 90}Sr/{sup 90}Y. The study was undertaken by means of an experimental design of blocks random that contemplate the following variables: intensity of the radiation source, (1850 MBq and 74 MBq); position of irradiation, (four positions); incidence of angle of the radiation (0, 15, 30, 45, 60 and 75 grades) and the absorbed dose in air, (0.005, 0.010, 0.020, 0.050 and 0.100 Gy). Then null hypothesis it was to suppose that there was not difference among the stockings of each treatment, to used the statistical of Duncan to carry out tests of stockings at a level of significance of 5%.These tests of stockings throw the following results in those variables of the experimental design: The irradiations carried out so much with the source pattern secondary of {sup 90}Sr/{sup 90}Y of 1850 MBq and of 74 MBq, they are equivalent reason why they can be used indistinctly. The responses of each one of the glasses of the card are strongly anisotropic for each glass

  2. Mensuration of equivalent dose with personal dosemeters and instruments of radiological protection in the new operative magnitudes ICRU, for external fields of beta radiation. Part I. Study of the homogeneity of the response personal dosemeters leaves (cards G-1, TLD-100), in radiation fields of Co{sub 60}; Medicion de dosis equivalente con dosimetros personales e instrumentos de proteccion radiologica en las nuevas magnitudes operativas ICRU, para campos de radiacion beta externos. Parte I. Estudio de la homogeneidad de la respuesta dosimetros personales (tarjetas G-1, TLD-100), en campos de radiacion de Co{sub 60}

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    Alvarez R, J.T. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    1994-01-15

    A sample of 40 composed personal dosemeters by cards model: G-l, (each card is made up of two TLD-100 crystals encapsulated in teflon), Harshaw trademark; those personal dosemeters present a free window and another with a filter of A1 of 171.7 mg cm{sup -2} of mass thickness.The objective of the work is to select of this sample of 40 personal dosemeters a population with the same stocking and standard deviation. The technique used is that of comparison of stockings, (ANOVA; Variance Analysis, when samples of the same one were had size; and/or GLM, Widespread Lineal Models, when the samples were of different size), by means of the use of those Duncan statistics, SNK, Tukey, Gabriel; the results are validated proving the kindness of adjustment of the experimental data to a Normal distribution by means of the Shapiro-Wilks statistics.The experimental design used consists on a test of two vias: a via is the variable card with two levels, (crystal 1 and 2), the other via is the variable irradiation position with four levels, (LS=left superior, SR= right superior, LI= left Inferior, IR = right inferior). The irradiations carried out in blocks of four personal dosemeters in a gamma radiation beam range of Cobalt 60; carrying out three repetitions of the design. With object of proving the homogeneity of the filter of A1 in those personal dosemeters the experimental design was executed for those cards without personal dosemeters.They were also carried out tests of stockings to the readings of bottom and sensibility of the reader equipment, (Harshaw, model marks 2271), certain that doesn{sup t} exist differences for sequence of reading, but if in the stockings of the sensibility, (they were 4 different populations). The responses of the dosemeters were corrected subtracting him the reading correspondence of bottom and by sensibility of the reader equipment before subjecting them to the tests of stockings mentioned. Of the results of the tests of stockings for the cards with

  3. Relative thermoluminescent efficiencies proton/gamma and helium/gamma of high temperature peaks in TLD-100 dosemeters; Eficiencias termoluminiscentes relativas proton/gamma y helio/gamma de picos de alta temperatura en dosimetros TLD-100

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    Flores M, E.; Avila, O.; Rodriguez V, M. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico); Massillon, J.L.G.; Buenfil A, E.; Ruiz T, C.; Brandan, M.E. [IFUNAM, 04500 Mexico D.F. (Mexico); Gamboa De Buen, I. [ICN-UNAM, 04500 Mexico D.F. (Mexico)

    2007-07-01

    This work presents measures of relative thermoluminescent efficiency of those high temperature peaks of TLD-100 dosemeters exposed to protons of 1.5 MeV and to helium nuclei of 3 and 7.5 MeV. A rigorous reading and of deconvolution protocol was used for the calculation of the TL efficiencies. Additionally an Excel program that facilitated the deconvolution adjustment process of the glow curves was elaborated. (Author)

  4. Response of TLD-100 LiF dosimeters for X-rays of low energies; Respuesta de dosimetros de TLD-100 de LiF para rayos X de bajas energias

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    Bonzi, E. V.; Mainardi, R. T. [Universidad Nacional de Cordoba, Facultad de Matematica, Astronomia y Fisica, Av. Haya de la Torre y Av. Medina Allende s/n, Ciudad Universitaria, X5016LEA Cordoba (Argentina)

    2011-10-15

    In diverse practical applications as the existent in radiological clinics, industrial facilities and research laboratories, the solid state dosimeters are used for the measure of the different types of ionizing radiations. At the present time dosimeters are manufactured with different types of materials that present thermoluminescent properties, to the effects of determining the absorbed radiation dose. Under these conditions, the radiation dose is determined integrated in all the range of energies of the beam of X-rays, since it assumes that the response of these dosimeters is lineal with the energy of the photons or radiant particles. Because interest exists in advancing in the development of a determination method in the way of the X-rays spectrum emitted by a tube of those used in diagnostic or therapy, we have measured the response of TLD-100 LiF dosimeters for low energies, minor at 60 keV, for a several group of these dosimeters. (Author)

  5. Measure of the attenuation curve of a beam of X-rays with TLD-100 dosimeters of LiF; Medicion de la curva de atenuacion de un haz de rayos X con dosimetros TLD-100 de LiF

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    Bonzi, E. V.; Mainardi, R. T. [Universidad Nacional de Cordoba, Facultad de Matematica, Astronomia y Fisica, Av. Haya de la Torre y Av. Medina Allende s/n, Ciudad Universitaria, Cordoba (Argentina); Germanier, A. [Ministerio de Ciencia y Tecnologia, Ceprocor, Unidad de Estudios Fisicos, Alvarez de Arenas 230, X5004AAP Barrio Juniors, Cordoba (Argentina); Delgado, V. [Universidad Complutense de Madrid, Departamento de Fisica Medica, Ciudad Universitaria, 28040 Madrid (Spain)

    2011-10-15

    The attenuation curve of a beam of X-rays represents the beam intensity in function of the attenuator thickness interposed between the source and the detector. To know with the major possible precision the attenuation curve is indispensable in procedures of spectral reconstruction. Their periodic measuring also offers valuable information on the correct operation of a tube of X-rays, diagnostic or therapy, when not have a specific detector for that activity. In this work was measured the attenuation curve of a tube of X-rays operated to 50 kV and 0.5 ma, using existent elements in any diagnostic or therapy laboratory with radiations. In the measures commercial aluminum foil was used, bent until 24 times and thermoluminescent dosimeters TLD 100 - LiF. Also, for comparison, was measured this attenuation curve with an ionization chamber brand Capintec model 192. Was determined by X-rays fluorescence the composition of the aluminium foil, since the present elements in the alloy can to affect the form of the attenuation curve. It is interesting to observe that these elements are in very low proportion (ppm) that they do not alter the attenuation capacity of the pure aluminium. Finally in a precision balance we weigh a big piece (30 cm x 100 cm) of aluminium foil and we obtained the thickness in g/c m2. It is possible to obtain attenuation curves of a beam of X-rays, with a high precision procedure and reproducibility. The use of TLD-100 dosimeters of LiF or similar makes that this activity was also quick and simple. (Author)

  6. Relative thermoluminescent efficiencies proton/gamma and helium/gamma of peaks of high temperature in TLD-100 dosemeters; Eficiencias termoluminiscentes relativas proton/gamma y helio/gamma de picos de alta temperatura en dosimetros TLD-100

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    Flores M, E. [UNAM, Facultad de Ciencias, 04510 Mexico D.F. (Mexico)

    2007-07-01

    The increase of the applications of ion beams in radiotherapy treatments has generated interest in the study of the thermoluminescent materials (TL) that allow to determine the applied doses. A way to quantify the TL response from these materials to ions is by means of the relative thermoluminescent efficiency. In the group of Thermoluminescent dosimetry of the Institute of Physics of the UNAM (IFUNAM) the thermoluminescent response of the TLD-100 dosemeters has been studied, which present a glow curve characteristic with several peaks that correspond to traps and luminescent centers in the material. The stable peaks know each other as 4, 5, 6a, 6b, 7, 8, 9 and 10. The efficiencies should be measured using the response so much to the radiation of interest (in this case protons and helium ions) as the response to gamma radiation. In previous works with ions of low energy taken place in the Pelletron accelerator of the IFUNAM was only measured the TL efficiency for the peak 5 and the total signal. It had not been possible to measure the efficiency of the peaks of high temperature (6a-10) because, for the gamma radiation, the peaks of high temperature show very small signals; however, recently Massillon carries out measures of efficiency TL of peaks of high temperature for ions of intermediate energy using a protocol special of reading and of deconvolution that allows to measure the signals coming from the peaks of high temperature. In this work is implemented this same protocol to complete the study of TL efficiencies at low energy of protons and helium and to determine if the values of efficiency depend on the used reading protocol. For it is reported it measures of the relative efficiency of the peaks of high temperature from the TLD-100 exposed to protons of 1.5 MeV and nuclei of helium of 3 and 7.5 MeV. (Author)

  7. Thermoluminescent response of dosemeters TLD-100 exposed to distinct baker protocols, irradiation and reading; Respuesta termoluminiscente de dosimetros TLD-100 sujetos a distintos protocolos de horneado, irradiacion y lectura

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    Estrada E, D

    2002-07-01

    The interest that motivated the realization of this work is the opposing discrepancy among the values of the efficiency thermoluminescent of heavy charged particles (PCP) regarding gamma radiation ({eta}{sub PCP}, {gamma}) reported in different works and gathered recently for Horowitz (Ho 01). The measures of relative thermoluminescent efficiency have importance in relation to the dosimetry associated to medical therapy with heavy charged particle. The measurement of {eta}{sub PCP}, {gamma} depends of multiple experimental factors. To understand this dependence it was quantified the effect of using different procedures experimental in the estimate of the relative thermoluminescent efficiency of dosemeters TLD-100 (LiF: Ti; Mg) for protons of 3 MeV regarding gamma rays of {sup 60}Co ({eta}{sub PCP}, {gamma}), varying the lot, the presentation, the one baked and the team reader. When was used the same global procedure values they were obtained for ({eta}{sub PCP}, {gamma}) inside the interval [0.30, 0.58] for the peak 5 and [0.35, 0.76] for the total thermoluminescent signal (Tl). At the use different equipment, baked and lot are obtained maximum differences of 30%, 12% and 6% respectively in the values of ({eta}{sub PCP}, {gamma}) for the peak 5, and 25%, 28% and 7% for the total Tl signal. The changes more significant of 36% and 44% for peak 5 and total signal respectively are obtained when changing the presentation of the dosemeter. As a complementary investigation it was studied the distribution of the Tl signal of each peak in the deconvolution of the curve of brightness with regard to the total signal in exposed dosemeters to high fluence of protons (1x10{sup 10} p/cm{sup 2}) varying the experimental protocol. It was found that the distribution of the Tl signal has a difference of the order of 5% when changing the used reading team. It was observed that the contribution of the peak 5 regarding the total signal are preserved when changing baked and that it

  8. Dosimetric evaluation of the response of the TLD-100 dosemeters in the IMRT technique by 'Step and Shoot'; Evaluacion dosimetrica de la respuesta de los dosimetros TLD-100 en la tecnica de IMRT por 'Step and Shoot'

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    Vasquez, J. [Fundacion Clinica Valle del Lili, A.A. 020338, Cali (Colombia); Benavides, S.O. [Depto. de Fisica, Universidad del Valle, A.A. 25360, Cali (Colombia)

    2005-07-01

    We show the results of the dosimetry response of LiF thermoluminescent crystals: TLD-100, where they were radiated in a linear accelerator Siemens Primus Hl using the Intensity Modulated Radiation Therapy (IMRT) by step and shoot technique. Previous to the crystals calibration and response evaluation, the acceptation procedures recommended by the TG-53 protocol for validation of the technique were carried out. The planning system utilized was the Theraplan Plus 3.8, using the algorithm of Pencil Kernel. The register and verification system was Lantis 5.2. The response curve of dose versus charge was obtained from the readings of the TLD in a Harshaw 3500. The crystals were radiated in a Bench- Marck phantom with doses previously determined by using ionization chambers for square radiation fields, in a beam with a 0.68 TPR20,10 corresponding to 6 MV of energy. We compare the response of these through of radiation of segmented fields in a Anthropomorphic phantom and the calculated doses by the planning system. The results obtained in the crystals response show deviations less than 5 % between the measured dose and the calculated dose in the zones of low gradient. It allows its implementation like routine control of quality by IMRT. (Author)

  9. Determination of the TLD-100 physical parameters

    International Nuclear Information System (INIS)

    Paucar J, J.; Picon C, C.

    1998-01-01

    This study was realized in the Physics service at the Radiotherapy Department of the National Institute of Neoplasic Diseases in Lima, Peru, it was determined the activation energy, the kinetic order and the frequency factor of the fifth peak of the TLD-100 thermoluminescent spectra using different algorithms. This was carried out in parallel with the implementation and design of a software and an interface associated with the Tl lecturer which allows a semiautomatic control for a thermoluminescent lecturer process. (Author)

  10. Determination of the TLD-100 physical parameters; Determinacion de parametros fisicos del TLD-100

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    Paucar J, J.; Picon C, C. [Instituto Nacional de Enfermedades Neoplasicas. INEN. Av. Angamos Este 2520, Lima 34 (Peru)

    1998-12-31

    This study was realized in the Physics service at the Radiotherapy Department of the National Institute of Neoplasic Diseases in Lima, Peru, it was determined the activation energy, the kinetic order and the frequency factor of the fifth peak of the TLD-100 thermoluminescent spectra using different algorithms. This was carried out in parallel with the implementation and design of a software and an interface associated with the Tl lecturer which allows a semiautomatic control for a thermoluminescent lecturer process. (Author)

  11. Phototransference in LiF (TLD-100) at low temperatures

    International Nuclear Information System (INIS)

    Rosa, L.A.R. da; Caldas, L.V.E.

    1990-01-01

    Phototransference experiments were performed with UV light of 250, 310 and 380 nm in LiF (TLD-100) at liquid nitrogen temperature with the aim of observing thermoluminescence emission peaks. (A.C.A.S.) [pt

  12. TLD-100 and Radiochromic Dye Film in Medical Dosimetry

    International Nuclear Information System (INIS)

    Mercado-Uribe, H.

    2006-01-01

    TLD-100 and radiochromic dye films are two types of the dosimeters most used in the medical physics area. Both are secondary detectors and operate in a different way and in different dose measurement ranges. The use of TLD-100 is based on the thermoluminescent process, and the RDF in the optical density change when has been exposed to an irradiation field previously. In this work it is analyzed in a general way, the advantages and characteristics of these detectors and the reasons of the great increase in their use in the last decades

  13. Fractional order of kinetics in LiF-TLD 100

    International Nuclear Information System (INIS)

    Moharil, S.V.

    1984-01-01

    In a recent letter, it has been argued that the non-first-order kinetics for LiF-TLD 100 obtained by Kathuria and Sunta (J. Phys. D: Appl. Phys. 12, 1573) is an artefact of their experimental set-up. In this letter it is shown that this is not the case. (author)

  14. Indoor gamma radiation monitoring In Rawalpindi, Pakistan using TLD100

    International Nuclear Information System (INIS)

    Azam, Sana; Tufail, Muhammad; Sohail, Muhammad

    2008-01-01

    Full text: Natural radioactivity originates from extraterrestrial sources as well as from radioactive elements in earth's crust. The amount of radioactivity varies from place to place and with altitude. The aim of this study was to observe the indoor radiation level in Rawalpindi using TLD. For this purpose LiF:Mg:Ti (TLD100) chips were used. Chips were annealed and then calibrated using different sources and the calibration factor obtained by using Cs137 source was selected for dose estimation. Its value was 0.1403 μGy/TL response. Rawalpindi categorized into six regions. In each region, 5 cemented houses were selected and TLD 100 chips were placed at a distance of 0.5 m from ground the level. Chips were properly covered to protect them from ultraviolet light and moisture and were placed for three months. The average annual indoor dose rate for Rawalpindi was estimated to be 392.105μGy/yr and average dose to be 97.65μGy. Therefore, the effective dose for population of Rawalpindi from indoor gamma radiation was estimated to be 313.68μSv/yr using an indoor occupancy factor of 80%. (author)

  15. Thermoluminescence and optical absorption comparative studies with TLD-100 and pure LiF

    International Nuclear Information System (INIS)

    Rosa, L.A.R. da; Caldas, L.V.E.

    1988-07-01

    Optical absorption (OA) studies were carried out with LiF: Mg, Ti (TLD-100) and pure LiF exposed to X radiation, 77.4 C.kg -1 (3 x 10 5 R) with the aim of relating the thermoluminescent (TL) peaks presented by TLD-100 to its intrinsic and irradiation defects. After a 280 0 C thermal treatment for 15 minutes, an absorption band at 225 nm is observed in the TLD-100 OA spectrum. This band is not observed in the case of pure LiF. A correlation between TL peak 5 and the absorption band at 310 nm is established for TLD-100. These results agree with other publications and are explained. (author) [pt

  16. Reproducibility study of TLD-100 dosimeters for {sup 122}I seeds used in brachytherapy

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    Zeituni, Carlos A. [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil); Universidade Presbiteriana Mackenzie, Sao Paulo, SP (Brazil); E-mail: czeituni@ipen.br; Moura, Eduardo S. [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil); Faculdade Oswaldo Cruz, Sao Paulo, SP (Brazil); Manzoli, Jose E. [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil); Universidade Sao Judas Tadeu, Sao Paulo, SP (Brazil); Terremoto, Luis A.A.; Rostelato, Maria Elisa C.M. [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2007-07-01

    In order to provide the dosimetry for {sup 125}I seed production in Brazil, Harshaw thermoluminescent dosimeters (TLD-100) will be used. Even if measurements with TLD-100 of the same batch of fabrication are performed, the precision of the response will not be the same. As a consequence, they must be measured one by one. This paper presents the calculation methodology for selection procedure to TLD-100 dosimeter used, embracing 143 TLD-100 dosimeters prepared by Harshaw Company on December 19th, 2005. These dosimeters are LiF type with a micro-cube (1 mm x 1 mm x 1 mm) shape. The annealing procedure used for these dosimeters consists of annealing the TLD dosimeters at 400 deg C for 65 minutes using a PC controlled annealing oven. This procedure is followed by an oven-typical cooling down profile to about 100 deg C for 127 minutes. The pre-readout thermal stabilization was used and it consists of an annealing at 100 deg C for 15 minutes. Irradiations were performed using 36 {sup 125}I seeds with activity of 0,623 mCi (23,05 MBq) on October 20th, 2006 for approximately 150 minutes, to guarantee a minimum of 5 Gy absorbed dose in each dosimeter. Different evanescence times have been used. These complete procedures were carried out four times in order to compare the data and minimize the systematic error. (author)

  17. Reproducibility study of TLD-100 dosimeters for 122I seeds used in brachytherapy

    International Nuclear Information System (INIS)

    Zeituni, Carlos A.; Moura, Eduardo S.; Manzoli, Jose E.; Terremoto, Luis A.A.; Rostelato, Maria Elisa C.M.

    2007-01-01

    In order to provide the dosimetry for 125 I seed production in Brazil, Harshaw thermoluminescent dosimeters (TLD-100) will be used. Even if measurements with TLD-100 of the same batch of fabrication are performed, the precision of the response will not be the same. As a consequence, they must be measured one by one. This paper presents the calculation methodology for selection procedure to TLD-100 dosimeter used, embracing 143 TLD-100 dosimeters prepared by Harshaw Company on December 19th, 2005. These dosimeters are LiF type with a micro-cube (1 mm x 1 mm x 1 mm) shape. The annealing procedure used for these dosimeters consists of annealing the TLD dosimeters at 400 deg C for 65 minutes using a PC controlled annealing oven. This procedure is followed by an oven-typical cooling down profile to about 100 deg C for 127 minutes. The pre-readout thermal stabilization was used and it consists of an annealing at 100 deg C for 15 minutes. Irradiations were performed using 36 125 I seeds with activity of 0,623 mCi (23,05 MBq) on October 20th, 2006 for approximately 150 minutes, to guarantee a minimum of 5 Gy absorbed dose in each dosimeter. Different evanescence times have been used. These complete procedures were carried out four times in order to compare the data and minimize the systematic error. (author)

  18. Thermoluminescent relative efficiencies of TLD-100 for nitrogen ions respect of gamma radiation; Eficiencias termoluminiscentes relativas de TLD-100 para iones de nitrogeno respecto de radiacion gamma

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    Concha S, K. [UNAM, Facultad de Ciencias, 04510 Mexico D.F. (Mexico); Avila, O. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Gamboa de Buen, I. [ICN-UNAM, 04510 Mexico D.F. (Mexico); Rodriguez V, M.; Buenfil, A.E.; Ruiz T, C.; Brandan, M.E. [IFUNAM, 04510 Mexico D.F. (Mexico)

    2004-07-01

    The purpose of this work is to measure the thermoluminescent relative efficiency of those TLD-100 dosemeters irradiated with nitrogen ions with respect to the gamma radiation of {sup 60} Co, in function of the linear energy transfer (LET). Two energy of such nitrogen ions were selected that has the same value from LET when impacting in the dosemeters but with E{sub 1} energy (4.8 MeV) and E{sub 2} (9.95 MeV) smaller and greater respectively that the energy of the Bragg peak. (Author)

  19. Response of TLD-100{sup TM} microtubes to two RQR3 quality radiation beams; Resposta de microcubos de TLD-100{sup TM} a dois feixes de qualidade RQR 3

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    Nunes, M.G.; Villani, D.; Almeida, S.B.; Vivolo, V.; Yoriyaz, H., E-mail: dvillani@ipen.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil); Louis, G.M.J. [Universidad Nacional Autonoma de Mexico (Mexico)

    2016-07-01

    The present work compares the response of TLD-100{sup TM} microcubes to two RQR 3 diagnostic radiology reference quality radiation beams, defined by IEC-61267 norm, aiming to evaluate the detectability of TLD-100{sup TM} energy dependence reported in literature within the same reference quality radiation range. TLD-100{sup TM} microcubes reproducibility is assessed through the response of a second set of TLD-100{sup TM} microcubes, evaluated in a second thermoluminescence reader, to the RQR 3 diagnostic radiology reference quality radiation beam implemented at the Laboratorio de Calibracao de Instrumentos of IPEN, Sao Paulo, SP, Brazil. The dependence of TLD-100{sup TM} microcubes TL response was not detectable in these conditions and the reproducibility of the measurements is 90,2%. (author)

  20. Verification or treatment planning system of radiotherapy using TLD-100; Verificacion de los sistemas de planificacion de tratamiento de radioterapia empleando TLD-100

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    Pinuela, J., E-mail: jcpinuela@hotmail.co [Hospital Central de Maracay (Venezuela, Bolivarian Republic of). Servicio de Radioterapia

    2010-07-01

    The evaluation of the treatment planning system (TPS) used in radiotherapy Precise Plan, was carried out using TLD-100 dosimeters, comparing the dose obtained with an ionization chamber. The TLD-100 were calibrated using secondary standard of SSDL, selecting dosimeters which had a standard deviation less than 1% for dosimeter calibration and less than 5% for dosimeter of field, for the tests conducted in TPS, The Alderson Phantom was used to evaluate the wedge and bolus, and Lucy 3D allowed us to evaluate correspondence of CT numbers, volume expansion, beam shaping, precise dose and beam weigh assignment. It was observed that the results of Lucy 3D were within the values expected except the volume expansion process with more than 10% difference, the evaluation of beam modulators systems with wedges and bolus as beam shaping yielded values within the expected with variations less than 5% and to assess the supply of specific doses, it was observed that the values obtained were precise and accurate since the same variation was less than 0.5% for the test. The importance of assessing the TPS lies in our country there is no procedure to verify that system and these tests provide a basis for future comparisons. (author)

  1. Evaluation of LiF:Mg,Ti (TLD-100 for Intraoperative Electron Radiation Therapy Quality Assurance.

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    Raffaele Liuzzi

    Full Text Available Purpose of the present work was to investigate thermoluminescent dosimeters (TLDs response to intraoperative electron radiation therapy (IOERT beams. In an IOERT treatment, a large single radiation dose is delivered with a high dose-per-pulse electron beam (2-12 cGy/pulse during surgery. To verify and to record the delivered dose, in vivo dosimetry is a mandatory procedure for quality assurance. The TLDs feature many advantages such as a small detector size and close tissue equivalence that make them attractive for IOERT as in vivo dosimeters.LiF:Mg,Ti dosimeters (TLD-100 were irradiated with different IOERT electron beam energies (5, 7 and 9 MeV and with a 6 MV conventional photon beam. For each energy, the TLDs were irradiated in the dose range of 0-10 Gy in step of 2 Gy. Regression analysis was performed to establish the response variation of thermoluminescent signals with dose and energy.The TLD-100 dose-response curves were obtained. In the dose range of 0-10 Gy, the calibration curve was confirmed to be linear for the conventional photon beam. In the same dose region, the quadratic model performs better than the linear model when high dose-per-pulse electron beams were used (F test; p<0.05.This study demonstrates that the TLD dose response, for doses ≤10 Gy, has a parabolic behavior in high dose-per-pulse electron beams. TLD-100 can be useful detectors for IOERT patient dosimetry if a proper calibration is provided.

  2. Equipment, measurement technique and annealing of LiF (TLD-100) in TL-dosimetry

    International Nuclear Information System (INIS)

    Unhjem, J.F.

    1987-01-01

    Results of variations in reference light, dark current, TL-signal and total background signal during a read-out series of LiF (TLD-100) crystals are presented. Also two annealing procedures are compared. The results indicate a good signal-to-noise ratio, E(S)/σ, and that a new annealing procedure takes less time to carry out. Because of the time-saving effect and the high signal-to-noise ratio, the new annealing procedure can be recommended

  3. Thermoluminescent relative efficiencies of TLD-100 for nitrogen ions respect of gamma radiation

    International Nuclear Information System (INIS)

    Concha S, K.; Avila, O.; Gamboa de Buen, I.; Rodriguez V, M.; Buenfil, A.E.; Ruiz T, C.; Brandan, M.E.

    2004-01-01

    The purpose of this work is to measure the thermoluminescent relative efficiency of those TLD-100 dosemeters irradiated with nitrogen ions with respect to the gamma radiation of 60 Co, in function of the linear energy transfer (LET). Two energy of such nitrogen ions were selected that has the same value from LET when impacting in the dosemeters but with E 1 energy (4.8 MeV) and E 2 (9.95 MeV) smaller and greater respectively that the energy of the Bragg peak. (Author)

  4. Quality control of the breast cancer treatments on Hdr brachytherapy with TLD-100

    International Nuclear Information System (INIS)

    Torres H, F.; De la Espriella V, N.; Sanchez C, A.

    2014-01-01

    An anthropomorphic Phantom, a female trunk, was built with a natural bone structure and experimental material coated, glycerin and water-based material called JJT to build soft tissue equivalent to the muscle of human tissue, and a polymer (styrofoam) to build the lung as critical organ to simulate the treatment of breast cancer, with high dose rate brachytherapy (Hdr) and sources of Ir-192. The treatments were planned and calculated for the critical organ: Lung, and injury of 2 cm in diameter in breast with Micro Selectron Hdr system and the software Plato Brachytherapy V 14.1 of the Nucletron (Netherlands) which uses the standard protocol of radiotherapy for brachytherapy treatments. The dose experimentally measured with dosimeters TLD-100 LiF: Mg; Ti, which were previously calibrated, were placed in the same positions and bodies mentioned above, with less than 5% uncertainty. The reading dosimeters was carried out in a Harshaw TLD 4500. The results obtained for calculated treatments, using the standard simulator, and the experimental with TLD-100, show a high concordance, as they are on average a ± 1.1% making process becomes in a quality control of this type of treatments. (Author)

  5. Quality control of the breast cancer treatments on Hdr brachytherapy with TLD-100

    Energy Technology Data Exchange (ETDEWEB)

    Torres H, F. [Universidad de Cordoba, Materials and Applied Physics Group, 230002 Monteria, Cordoba (Colombia); De la Espriella V, N. [Universidad de Cordoba, Grupo Avanzado de Materiales y Sistemas Complejos, 230002 Monteria, Cordoba (Colombia); Sanchez C, A., E-mail: franciscotorreshoyos@yahoo.com [Universidad de Cordoba, Departamento de Enfermeria, 230002 Monteria, Cordoba (Colombia)

    2014-07-01

    An anthropomorphic Phantom, a female trunk, was built with a natural bone structure and experimental material coated, glycerin and water-based material called JJT to build soft tissue equivalent to the muscle of human tissue, and a polymer (styrofoam) to build the lung as critical organ to simulate the treatment of breast cancer, with high dose rate brachytherapy (Hdr) and sources of Ir-192. The treatments were planned and calculated for the critical organ: Lung, and injury of 2 cm in diameter in breast with Micro Selectron Hdr system and the software Plato Brachytherapy V 14.1 of the Nucletron (Netherlands) which uses the standard protocol of radiotherapy for brachytherapy treatments. The dose experimentally measured with dosimeters TLD-100 LiF: Mg; Ti, which were previously calibrated, were placed in the same positions and bodies mentioned above, with less than 5% uncertainty. The reading dosimeters was carried out in a Harshaw TLD 4500. The results obtained for calculated treatments, using the standard simulator, and the experimental with TLD-100, show a high concordance, as they are on average a ± 1.1% making process becomes in a quality control of this type of treatments. (Author)

  6. Environmental dosimetry system based on LiF : Mg, Ti (TLD-100)

    International Nuclear Information System (INIS)

    Saez Vergara, J.C.

    1990-01-01

    The report presents the various tests carried out to the characterize a thermoluminescence environmental dosimetry systems, using the phosphor LiF:mg,Ti (TLD-100) in chip form. The holder has been specifically designed in order to obtain simplicity in the operation and to assure correct measurements in terms of the new operational quantities in radiation protection (ICRU-1985). Some topics in TLD Environmental Monitoring are discussed (Dark Current, Reference Light, Zero Reading, Free-in-Air or Phantom Calibration, Fading Correction, Transit Dose, etc.), and the proposed solutions are exposed. The tests performed have been designed to conform with the different existing international Standards and Recommendations (ANSI : N545-1975; IEC: Draft 45B-1987, ISO : DP 8034-19849. The data from an European Interlaboratory Programm (EUR-8932) have been used to evaluate the performance : the TLD System presented is among the best systems using TLD-100. The results obtained in the characterization (linearity, repeatability, detection threshold, residue, angular response, stability of stored information, etc.) show the optimum performance of this dosimetric system in its application to environmental gamma dose monitoring. Based on these results, two operational procedures have been developed for the application of this Dosimetric System, specially in Quality Assurance Monitoring Programs around Nuclear Plants in Spain. (author)

  7. On the determination of the post-irradiation time from the glow curve of TLD-100

    International Nuclear Information System (INIS)

    Weinstein, M.; German, U.; Dubinsky, S.; Alfassi, Z.B.

    2003-01-01

    The ratio of peak 3 to the sum of peaks 4 + 5 in TLD-100 was measured for various pre-irradiation and post-irradiation time periods, under conditions characteristic of routine personal dosimetry. It was confirmed that the value of this ratio depends only on the elapsed time between the prior readout and the present one, independent of the moment when the irradiation took place during the total time interval (storage time). This effect indicates that fading of peak 3 seems to be due mainly to changes in the unoccupied traps, and not to decay of trapped charges, being almost independent of the presence of electrons or holes in the traps. This observation leads to the conclusion that the suggestions in the past to use the decay of peak 3 in TLD-100 for the measurement of the elapsed time between irradiation and readout may have been wrong. On the other hand, the decay of peak 2 can be used to measure the elapsed time from irradiation, since the rate of decay is different when related to pre-irradiation and post-irradiation times, indicating a much higher decay rate of the trapped charges (Randall-Wilkins decay). However, because of the fast decay rate of peak 2, its use for determination of the elapsed time since irradiation is of little practical significance. (author)

  8. Characterization of TLD-100 micro-cubes for use in small field dosimetry

    Energy Technology Data Exchange (ETDEWEB)

    Peña-Jiménez, Salvador, E-mail: zoid-9861@yahoo.com.mx; Gamboa-deBuen, Isabel, E-mail: gamboa@nucleares.unam.mx [Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Av. Universidad 3000, 04510 DF (Mexico); Lárraga-Gutiérrez, José Manuel, E-mail: jose.larraga.gtz@gmail.com, E-mail: amanda.garcia.g@gmail.com; García-Garduño, Olivia Amanda, E-mail: jose.larraga.gtz@gmail.com, E-mail: amanda.garcia.g@gmail.com [Laboratorio de Física Médica, Instituto Nacional de Neurología y Neurocirugía Manuel Velasco Suárez, Av. Insurgentes Sur 3877, 14269 DF (Mexico)

    2014-11-07

    At present there are no international regulations for the management of millimeter scale fields and there are no suggestions for a reference detector to perform the characterization and dose determination for unconventional radiation beams (small fields) so that the dosimetry of small fields remains an open research field worldwide because these fields are used in radiotherapy treatments. Sensitivity factors and reproducibility of TLD-100 micro-cubes (1×1×1 mm3) were determinate irradiating the dosimeters with a 6 MV beam in a linear accelerator dedicated to radiosurgery at the Instituto Nacional de Neurología y Neurocirugía (INNN). Thermoluminescent response as a function of dose was determined for doses in water between 0.5 and 3 Gy and two field sizes (2×2 cm2 and 10×10 cm2). It was found that the response is linear over the dose range studied and it does not depend on field size.

  9. Thermoluminescence of pure LiF and Lif (TLD-100) irradiated at room temperature

    International Nuclear Information System (INIS)

    Sagastibelza Chivite, F.

    1980-01-01

    The thermoluminescence of pure LiF and LiF (TLD-100) crystals irradiated at room temperature with x - or gamma-rays has been studied up to 460 degree centigree. For most of the glow peaks found the kinetics, preexponential factors and activation energies have been determined. These parameters have been obtained by means of the isothermal method. The study of the thermal annealing of the radiation induced F and Z centres has allow to show that there is a correlation among the glow peaks and the annealing stages of these centres. It is concluded that the F and Z - centres play the role of recombination centres for halogen interstitial atom thermally released from traps. Light emission occurs in this recombination. (Author) 120 refs

  10. Response of TLD-100 LiF dosimeters for X-rays of low energies

    International Nuclear Information System (INIS)

    Bonzi, E. V.; Mainardi, R. T.

    2011-10-01

    In diverse practical applications as the existent in radiological clinics, industrial facilities and research laboratories, the solid state dosimeters are used for the measure of the different types of ionizing radiations. At the present time dosimeters are manufactured with different types of materials that present thermoluminescent properties, to the effects of determining the absorbed radiation dose. Under these conditions, the radiation dose is determined integrated in all the range of energies of the beam of X-rays, since it assumes that the response of these dosimeters is lineal with the energy of the photons or radiant particles. Because interest exists in advancing in the development of a determination method in the way of the X-rays spectrum emitted by a tube of those used in diagnostic or therapy, we have measured the response of TLD-100 LiF dosimeters for low energies, minor at 60 keV, for a several group of these dosimeters. (Author)

  11. Thermoluminescent response of dosemeters TLD-100 exposed to distinct baker protocols, irradiation and reading

    International Nuclear Information System (INIS)

    Estrada E, D.

    2002-01-01

    The interest that motivated the realization of this work is the opposing discrepancy among the values of the efficiency thermoluminescent of heavy charged particles (PCP) regarding gamma radiation (η PCP , γ) reported in different works and gathered recently for Horowitz (Ho 01). The measures of relative thermoluminescent efficiency have importance in relation to the dosimetry associated to medical therapy with heavy charged particle. The measurement of η PCP , γ depends of multiple experimental factors. To understand this dependence it was quantified the effect of using different procedures experimental in the estimate of the relative thermoluminescent efficiency of dosemeters TLD-100 (LiF: Ti; Mg) for protons of 3 MeV regarding gamma rays of 60 Co (η PCP , γ), varying the lot, the presentation, the one baked and the team reader. When was used the same global procedure values they were obtained for (η PCP , γ) inside the interval [0.30, 0.58] for the peak 5 and [0.35, 0.76] for the total thermoluminescent signal (Tl). At the use different equipment, baked and lot are obtained maximum differences of 30%, 12% and 6% respectively in the values of (η PCP , γ) for the peak 5, and 25%, 28% and 7% for the total Tl signal. The changes more significant of 36% and 44% for peak 5 and total signal respectively are obtained when changing the presentation of the dosemeter. As a complementary investigation it was studied the distribution of the Tl signal of each peak in the deconvolution of the curve of brightness with regard to the total signal in exposed dosemeters to high fluence of protons (1x10 10 p/cm 2 ) varying the experimental protocol. It was found that the distribution of the Tl signal has a difference of the order of 5% when changing the used reading team. It was observed that the contribution of the peak 5 regarding the total signal are preserved when changing baked and that it results to be 8% greater for the presentation in dosemeters of 1 x 1 x 1 mm 3

  12. Difference between the mechanisms of peak formation of dosimetric TL(5) and 6 and 7 of TLD-100

    International Nuclear Information System (INIS)

    Rosa, L.A.R. da; Caldas, L.V.E.

    1986-01-01

    It is studied the best model to explain the peak formation of TL 5,6 and 7 of TLD-100. The mission curves of the irradiated material were compared at environmental temperature and at 77 0 K. (E.G) [pt

  13. Use of TLD-100 to verify a dosimetric method for total electron skin irradiation

    International Nuclear Information System (INIS)

    Mesa, F.; Sosa, M.

    2007-01-01

    Full text: A clinical dosimetric method for generating a homogeneous field of radiation around of patients under treatment of total skin electron irradiation and its verification using thermoluminescent dosimetry is presented. The irradiations were performed utilizing a 6 MeV electron beam generated by a Varian Clinac 21EX linear accelerator installed in the oncology unit of the IMSS-Tl hospital in Leon. Levels of radiation for diverse adjustment performed in the treatment planning system of the lineal accelerator and registered to different treatment distances using a computerized water phantom system were studied. A large batch of TLD-100 chips calibrated in terms of air-kerma rate to the standard treatment distance and positioned in an anthropomorphic Alderson Random Phantom was used. Dose verification and comparison with the measurements made with the computerized system were analyzed. A single field electron beam for treatment of total skin irradiation was implemented. Preliminary results indicate that the levels of dose homogeneities were larger than 90% for distances up to 3.0 m. The results suggest that the method developed is a reliable for delivering an electron beam with significantly homogeneity for these treatments. Analyses and results of both thermoluminescent and computerized dosimetric system calibrations are also presented. (Author)

  14. Contribution to the optimization of individual dose measurement with TLD 100 using the TLD reader 6600

    International Nuclear Information System (INIS)

    RAFARAVAVY, R.

    2003-01-01

    In Madagascar, thermoluminescent dosimeters are used for individual monitoring of personal exposed by ionising radiation. This work consist to find the optimal condition of reading parameters, to calibrate the reader HARSHAW TLD 6600, and to determine the lower value of dose measurable by the TLD 100. The betters values of the temperature rate, the preheat time and the anneal time are respectively 21 0 C s - 1, 9s and 5s. Calibration of the reader HARSHAW TLD 6600 has permitted to have true value conventional. The calibration factors corresponding to the pastille of dosimeter which measure the whole body dose and the one which measure the skin dose are respectively 0.031nC μSv - 1 and 0.035 nCμSv-1. These calibration factors are tied to measured parameters values mentioned above. The lower limit of detection found is equal to 10.12 μSv. All measured values (background deduced) less than this lower limit of detection are considered as background fluctuation [fr

  15. Personal dosimetry TLD 100 in orthopedic surgeons exposed to ionizing radiation in Bogota - Colombia

    International Nuclear Information System (INIS)

    Sierra C, B. Y.; Jimenez, Y.; Plazas, M. C.; Eslava S, J.; Groot R, H.

    2014-08-01

    Orthopedic surgeons should be considered as professionals occupationally exposed to ionizing radiation, for using C arc (fluoroscope) an equipment of X type radiation emission, during surgical procedures for imaging generation. Some health institutes, use of C arc under uncontrolled circumstances, such a lack of dosimetry control, incomplete or absence of personnel protective elements and protective measures, which in turn, lead to a high exposition to the personnel. Materials and methods. Study of double match cohort by age and gender, was conducted, in four health institutions of second and third level of attention in Bogota city. Personal dosimetry measurements with TLD-100 dosimetry crystals in both cohorts and environmental dosimetry in each of operation rooms used for orthopedic procedures, were carry out during six months of follow up. Dosimetry crystals were read in a Harshaw 4500 - Bicron equipment, in the Medical Physics Laboratory of National University of Colombia. Results. Dosimetry measurements are compatibles with those of occupationally exposed personnel 3.44 mSv/6 m CI 95% (1.66-3.99), even does not overpass ICRP recommendations, are higher as were expect at the beginning of the study. The median of effective accumulative dose in thorax is 3,4 mSv CI 95% (1,66-3,99), higher in comparison with neck value 2,7 mSv CI 95% (1,73-3,80) and hand dosimetry 1,42 mSv CI 95% (0,96-2,34). Conclusions: Orthopedic surgeons should be considered occupational exposed to ionizing radiation, who has to accomplish to the radiological protection measures, dosimetric follow up and maintenance of the used X ray equipment. It was confirm throughout this study that dosimetry shows higher levels as expected at the beginning of the study, compatible with occupationally exposed personnel. (Author)

  16. TLD-100 glow-curve deconvolution for the evaluation of the thermal stress and radiation damage effects

    International Nuclear Information System (INIS)

    Sabini, M.G.; Bucciolini, M.; Cuttone, G.; Guasti, A.; Mazzocchi, S.; Raffaele, L.

    2002-01-01

    In this work, the dose response of TLD-100 dosimeters has been studied in a 62 MeV clinical proton beams. The signal versus dose curve has been compared with the one measured in a 60 Co beam. Different experiments have been performed in order to observe the thermal stress and the radiation damage effects on the detector sensitivity. A LET dependence of the TL response has been observed. In order to get a physical interpretation of these effects, a computerised glow-curve deconvolution has been employed. The results of all the performed experiments and deconvolutions are extensively reported, and the TLD-100 possible fields of application in the clinical proton dosimetry are discussed

  17. TLD-100 glow-curve deconvolution for the evaluation of the thermal stress and radiation damage effects

    CERN Document Server

    Sabini, M G; Cuttone, G; Guasti, A; Mazzocchi, S; Raffaele, L

    2002-01-01

    In this work, the dose response of TLD-100 dosimeters has been studied in a 62 MeV clinical proton beams. The signal versus dose curve has been compared with the one measured in a sup 6 sup 0 Co beam. Different experiments have been performed in order to observe the thermal stress and the radiation damage effects on the detector sensitivity. A LET dependence of the TL response has been observed. In order to get a physical interpretation of these effects, a computerised glow-curve deconvolution has been employed. The results of all the performed experiments and deconvolutions are extensively reported, and the TLD-100 possible fields of application in the clinical proton dosimetry are discussed.

  18. Relative thermoluminescent efficiencies proton/gamma and helium/gamma of high temperature peaks in TLD-100 dosemeters

    International Nuclear Information System (INIS)

    Flores M, E.; Avila, O.; Rodriguez V, M.; Massillon, J.L.G.; Buenfil A, E.; Ruiz T, C.; Brandan, M.E.; Gamboa De Buen, I.

    2007-01-01

    This work presents measures of relative thermoluminescent efficiency of those high temperature peaks of TLD-100 dosemeters exposed to protons of 1.5 MeV and to helium nuclei of 3 and 7.5 MeV. A rigorous reading and of deconvolution protocol was used for the calculation of the TL efficiencies. Additionally an Excel program that facilitated the deconvolution adjustment process of the glow curves was elaborated. (Author)

  19. Comparison of the responses of TLD-100 and radiochromic films exposed to X-rays of low energy in a radiodiagnostic clinical treatment

    International Nuclear Information System (INIS)

    Castro, M.; Mesa, F.; Sosa, M.

    2007-01-01

    Full text: In this work a comparison of the responses of a TLD-100 and a radiochromic film exposed to a low energy X-ray beam is presented. X-rays in the range of 20 to 120 KV from a clinical machine at the radiodiagnostic unit of the IMSS-Tl hospital in Leon were used. The processes of calibration of both the TLD-100 and the radiochromic films are also discussed. (Author)

  20. Obtention of thermoluminescent efficiencies by means of irradiation of TLD-100 dosemeters with proton beams helium and carbon

    International Nuclear Information System (INIS)

    Avila, O.; Rodriguez V, M.; Aviles, P.; Gamboa de Buen, I.; Buenfil, A.E.; Ruiz T, C.; Brandan, M.E.

    2002-01-01

    In this work, the advances of a serial of measurements of relative efficiency thermoluminescent of heavy charged particles (PCP) with respect to gamma radiation for TLD-100, dosemeters of LiF: Mg,Ti manufactured by the Harshaw-Bicron company are reported. The PCP are essentials in the implementation of dosimetry associated with medical applications. The measurements before gamma radiation were carrying out using the Vickrad irradiator of the National Institute of Nuclear Research at dose of 1.663 Gy. The measures which are reported about protons, helium and carbon were realized using the Pelletron accelerator of the Physics Institute of the UNAM. (Author)

  1. Thermoluminescence of pure LiF and Lif (TLD-100) irradiated at room temperature; Termoluminiscencia en LiF puro y LiF dosimetrico (TLD-100), irradiados a temperatura ambiente

    Energy Technology Data Exchange (ETDEWEB)

    Sagastibelza Chivite, F.

    1980-07-01

    The thermoluminescence of pure LiF and LiF (TLD-100) crystals irradiated at room temperature with x - or gamma-rays has been studied up to 460 degree centigree. For most of the glow peaks found the kinetics, preexponential factors and activation energies have been determined. These parameters have been obtained by means of the isothermal method. The study of the thermal annealing of the radiation induced F and Z centres has allow to show that there is a correlation among the glow peaks and the annealing stages of these centres. It is concluded that the F and Z - centres play the role of recombination centres for halogen interstitial atom thermally released from traps. Light emission occurs in this recombination. (Author) 120 refs.

  2. Analysis of read-out heating rate effects on the glow peaks of TLD-100 using WinGCF software

    Energy Technology Data Exchange (ETDEWEB)

    Bauk, Sabar, E-mail: sabar@usm.my [Physics Section, School of Distance Education, Universiti Sains Malaysia, 11800 USM, Penang (Malaysia); Hussin, Siti Fatimah [School of Physics, Universiti Sains Malaysia, 11800 USM, Penang (Malaysia); Alam, Md. Shah [Physics Section, School of Distance Education, Universiti Sains Malaysia, 11800 USM, Penang (Malaysia); Physics Department, Shahjalal University of Science and Technology, Sylhet (Bangladesh)

    2016-01-22

    This study was done to analyze the effects of the read-out heating rate on the LiF:Mg,Ti (TLD-100) thermoluminescent dosimeters (TLD) glow peaks using WinGCF computer software. The TLDs were exposed to X-ray photons with a potential difference of 72 kVp and 200 mAs in air and were read-out using a Harshaw 3500 TLD reader. The TLDs were read-out using four read-out heating rates at 10, 7, 4 and 1 °C s{sup −1}. It was observed that lowering the heating rate could separate more glow peaks. The activation energy for peak 5 was found to be lower than that for peak 4. The peak maximum temperature and the integral value of the main peak decreased as the heating rate decreases.

  3. Measure of the attenuation curve of a beam of X-rays with TLD-100 dosimeters of LiF

    International Nuclear Information System (INIS)

    Bonzi, E. V.; Mainardi, R. T.; Germanier, A.; Delgado, V.

    2011-10-01

    The attenuation curve of a beam of X-rays represents the beam intensity in function of the attenuator thickness interposed between the source and the detector. To know with the major possible precision the attenuation curve is indispensable in procedures of spectral reconstruction. Their periodic measuring also offers valuable information on the correct operation of a tube of X-rays, diagnostic or therapy, when not have a specific detector for that activity. In this work was measured the attenuation curve of a tube of X-rays operated to 50 kV and 0.5 ma, using existent elements in any diagnostic or therapy laboratory with radiations. In the measures commercial aluminum foil was used, bent until 24 times and thermoluminescent dosimeters TLD 100 - LiF. Also, for comparison, was measured this attenuation curve with an ionization chamber brand Capintec model 192. Was determined by X-rays fluorescence the composition of the aluminium foil, since the present elements in the alloy can to affect the form of the attenuation curve. It is interesting to observe that these elements are in very low proportion (ppm) that they do not alter the attenuation capacity of the pure aluminium. Finally in a precision balance we weigh a big piece (30 cm x 100 cm) of aluminium foil and we obtained the thickness in g/c m2. It is possible to obtain attenuation curves of a beam of X-rays, with a high precision procedure and reproducibility. The use of TLD-100 dosimeters of LiF or similar makes that this activity was also quick and simple. (Author)

  4. Relative thermoluminescent efficiencies proton/gamma and helium/gamma of peaks of high temperature in TLD-100 dosemeters

    International Nuclear Information System (INIS)

    Flores M, E.

    2007-01-01

    The increase of the applications of ion beams in radiotherapy treatments has generated interest in the study of the thermoluminescent materials (TL) that allow to determine the applied doses. A way to quantify the TL response from these materials to ions is by means of the relative thermoluminescent efficiency. In the group of Thermoluminescent dosimetry of the Institute of Physics of the UNAM (IFUNAM) the thermoluminescent response of the TLD-100 dosemeters has been studied, which present a glow curve characteristic with several peaks that correspond to traps and luminescent centers in the material. The stable peaks know each other as 4, 5, 6a, 6b, 7, 8, 9 and 10. The efficiencies should be measured using the response so much to the radiation of interest (in this case protons and helium ions) as the response to gamma radiation. In previous works with ions of low energy taken place in the Pelletron accelerator of the IFUNAM was only measured the TL efficiency for the peak 5 and the total signal. It had not been possible to measure the efficiency of the peaks of high temperature (6a-10) because, for the gamma radiation, the peaks of high temperature show very small signals; however, recently Massillon carries out measures of efficiency TL of peaks of high temperature for ions of intermediate energy using a protocol special of reading and of deconvolution that allows to measure the signals coming from the peaks of high temperature. In this work is implemented this same protocol to complete the study of TL efficiencies at low energy of protons and helium and to determine if the values of efficiency depend on the used reading protocol. For it is reported it measures of the relative efficiency of the peaks of high temperature from the TLD-100 exposed to protons of 1.5 MeV and nuclei of helium of 3 and 7.5 MeV. (Author)

  5. Dosimetric evaluation of the response of the TLD-100 dosemeters in the IMRT technique by 'Step and Shoot'

    International Nuclear Information System (INIS)

    Vasquez, J.; Benavides, S.O.

    2005-01-01

    We show the results of the dosimetry response of LiF thermoluminescent crystals: TLD-100, where they were radiated in a linear accelerator Siemens Primus Hl using the Intensity Modulated Radiation Therapy (IMRT) by step and shoot technique. Previous to the crystals calibration and response evaluation, the acceptation procedures recommended by the TG-53 protocol for validation of the technique were carried out. The planning system utilized was the Theraplan Plus 3.8, using the algorithm of Pencil Kernel. The register and verification system was Lantis 5.2. The response curve of dose versus charge was obtained from the readings of the TLD in a Harshaw 3500. The crystals were radiated in a Bench- Marck phantom with doses previously determined by using ionization chambers for square radiation fields, in a beam with a 0.68 TPR20,10 corresponding to 6 MV of energy. We compare the response of these through of radiation of segmented fields in a Anthropomorphic phantom and the calculated doses by the planning system. The results obtained in the crystals response show deviations less than 5 % between the measured dose and the calculated dose in the zones of low gradient. It allows its implementation like routine control of quality by IMRT. (Author)

  6. Study of the influence of the time temperature profile on the minimum detectable dose of TLD-100

    International Nuclear Information System (INIS)

    Meireles, Leonardo S.; Lacerda, Marco Aurelio S.; Meira-Belo, Luiz C.; Ferreira, Hudson R.

    2013-01-01

    Monitoring of workers and workplaces is an integral part of any radiation protection programme (RPP). It is essential to demonstrate compliance with regulations that limit the allowable dose to the public from manmade sources and to enable the responsible of the installations to verify compliance with the legal dose limits to the workers and ALARA goals. Thermoluminescent dosemeters (TLDs) are generally employed to assess the environmental and personnel doses. To completely characterize a TLD dosimetry system is fundamental to determine the Lowest Dose that the system is capable of measuring. As the amount of the light emitted by TLD material is a function of the time temperature profile (TTP), in the present study, the influence of the TTP on the Detection Threshold (MDD) of the LiF:Mg,Ti (TLD-100) detectors was evaluated. Eighteen different TTPs were tested for two different annealing processes: (I) utilization of the TTP itself and; (II) a microprocessor controlled oven annealing procedure. Results showed that TTP choice can influence significantly in the MDD values. The worst results were generally found for TLDs annealed by the TTP itself. The lack of pattern or the unexpected behavior to the influence of some parameters of the TTP on the calculated MDDs must be carefully investigated. Greater variations on the TTP parameters must be undertaken. Special attention must be also done on the methodology of calculating the MDDs. (author)

  7. A Dosimetry of 106-Ru - 106- Rh Electron-Photon Field with LiF TLD-100 'Microcubes'

    International Nuclear Information System (INIS)

    Kovacevic, N.; Vrtar, M.; Vekic, B.; Knezevic, Z.

    2003-01-01

    Background and purpose: Ru-Rh eye applicators are used for the radiotherapy of eye malignancies such as melanomas. The producer (BEBIG GmbH) declares ±30% dose uncertainty in the applicator certificate. There is an obvious need to overcome this large imprecision. Our goal is to establish a method that is fast and reliable and which reduces dose uncertainty to below ±10%. Materials and methods: A pleksiglas phantom containing spherical calottes was constructed for this purpose. It allows measurements of surface homogeneity, absolute surface dose rates and depth doses in 2 mm steps, on and off the symmetry axis. Very small, 1x1x1 mm 3 thermoluminescent dosimeters (TLD) were chosen as dosimeters. They have to be calibrated adequately for Ru-Rh dosimetry. To do that, 6 0C o/electron field response ratio of TLDs was investigated and correction factors were established. Doses to the base of optic nerve were considered. Results: The 6 0C o/electron beam response ratio of TLDs is in agreement with measured and calculated results reported by other authors (for LiF TLD-100 of different dimensions). The measurements of surface dose rate homogeneity show deviations of up to 15% of the mean surface dose rate. However, surface inhomogeneities average out deeper in the phantom. Absolute surface dose rates were found lower than those declared by the producer by 6.2%, averaged over 8 applicators investigated. On and off axis depth doses are highly uniform over angle θ=40 degrees from symmetry axis, up to 6 mm in depth. Therefore, depth doses form spherical isodose surfaces within stated angle, spanning at least 1.47 steradians. Depth dose functions were interpolated to the measured data for practical routine use. Conclusions: The method developed here has overall combined uncertainty <±6%, and therefore reduces significantly uncertainty declared by the producer. Also, it proved to be stable on repeated measurements. (author)

  8. Mensuration of equivalent dose with personal dosemeters and instruments of radiological protection in the new operative quantities ICRU, for external fields of beta radiation. Part II. I study of the angular response of personal dosemeters TLD-100 in secondary patron fields of beta radiation (90Sr / 90Y)

    International Nuclear Information System (INIS)

    Alvarez R, J.T.

    1994-01-01

    The objective of this work is to carry out one of the possible ones test type for personal dosemeters TLD, under the recomendations of the ICRU 39, ICRU 43 and the draft of the norm ISO 6980,(1992), with the purpose of verifying the capacity of these detectors to carry out the operative unit: H' (0.07;α). Since H' (O. 07;α) this defined one in an expanded field, one of these tests type consist on determining the angular response of these detectors. 20 personal dosemeters TLD-100 was used, (card marks: Harshaw, Model: G-1, with two glasses of TLD-100 absorbed in teflon; the portadosemeters has two windows, a free one and another with a filter of Pb of 171.0 mg cm -2 ); these dosemeters they were previously selected, [to see, S tudy of the Homogeneity of the response of Personal Dosemeters (Cards G-l, TLD-100) in Radiation of Countrysides of 60 Co , J.T. Alvarez R. Technician Report GSR/IT/0001/94].The irradiations to effectued in secondary countryside of radiation beta of 90 Sr/ 90 Y. The study was undertaken by means of an experimental design of blocks random that contemplate the following variables: intensity of the radiation source, (1850 MBq and 74 MBq); position of irradiation, (four positions); incidence of angle of the radiation (0, 15, 30, 45, 60 and 75 grades) and the absorbed dose in air, (0.005, 0.010, 0.020, 0.050 and 0.100 Gy). Then null hypothesis it was to suppose that there was not difference among the stockings of each treatment, to used the statistical of Duncan to carry out tests of stockings at a level of significance of 5%.These tests of stockings throw the following results in those variables of the experimental design: The irradiations carried out so much with the source pattern secondary of 90 Sr/ 90 Y of 1850 MBq and of 74 MBq, they are equivalent reason why they can be used indistinctly. The responses of each one of the glasses of the card are strongly anisotropic for each glass; four positions of irradiation is used: glass 1 (window of

  9. Dosimetric analysis using glasses TLD-100 Lif; Mg; TI for the optimization of the quality control programs in radio surgery stereo tactic

    International Nuclear Information System (INIS)

    Maldonado, J. C; Plazas, M. C.; Dussan, R.; Conrado, Z.; Pena, G.; Jimenez, E.; Hakim, F.; Bermudez, S.

    2001-01-01

    The conditions of Stereo Tactic Radio Surgery treatments are simulated by means of the use of thermo luminescent glasses TLD-100 LiF; Mg; Ti placed in mannequins, to demonstrate that the doses received by the patients, either in the fractioned or in the mono fractioned techniques, are over the 500cGy, making urgent the use of a reliable dosimetric method [es

  10. Production dosimeter LiF: Mg, Ti and comparison its responses with dosimeter LiF: Mg, Ti (TLD-100) in Harshaw company against of gamma rays

    OpenAIRE

    KH Mohammadi; R Sarraf Maamory; R Mohammadi; A Mosavi Zarandi

    2010-01-01

    Thermoluminescence dosimeters are small tablets used with 3. 2*3. 2*0. 9mm^3 for measurement of received dose from radioactive various beams. The most common dosimeter is TLD-100 which is lithium-fluoride family and this dosimeter contain magnesium impurities. In this study, first lithium-flouride powder was mixed with titanium and controlled atmosphere samples were heated. After measuring of samples density and hardness, their glow curves were drawn and microscopic pictures of producted samp...

  11. Proton/gamma relative thermoluminescence efficiencies of LiF:Mg,Cu,P+PTFE prepared at ININ and TLD-100H

    Energy Technology Data Exchange (ETDEWEB)

    Avila, O.; Gonzalez, P.; Murillo, G. [Departamento de Fisica, ININ, Carretera Mexico-Toluca s/n, Ocoyoacac 52750, Estado de Mexico (Mexico)

    2009-10-15

    Properties of LiF:Mg,Cu,P+PTFE dosemeters developed at ININ have been investigated in order to evaluate their performance compared to those of equivalent commercial dosemeters. In this work both LiF:Mg,Cu,P+PTFE and TLD-100H pellets were exposed to low fluence 3 MeV protons and to low dose gamma radiation to evaluate experimental proton/gamma efficiencies. Gamma irradiation was performed using the Vic krad irradiator at ININ at varying doses between 25 and 500 mGy. For proton irradiation the Tandem Van de Graaff accelerator at ININ was used. Dosemeters were placed on a holder inside a scattering chamber where protons impinge on a gold target and scatter in all directions. The holder allows for several angular positions so that dosemeters receive proton fluence between 10{sup 6} and 10{sup 1}0 p/cm{sup 2}. Experimental efficiency values found for LiF:Mg,Cu,P+PTFE and TLD-100H were 0.18 +- 03 and 0.23 +- 0.03, respectively. These results allow to confirm the reliability of the dosemeters developed at ININ. (Author)

  12. A comparative evaluation of luminescence detectors: RPL-GD-301, TLD-100 and OSL-AL2O3:C, using Monte Carlo simulations

    Science.gov (United States)

    Benali, A.-H.; Medkour Ishak-Boushaki, G.; Nourreddine, A.-M.; Allab, M.; Papadimitroulas, P.

    2017-07-01

    The luminescent dosimeters are widely used in clinical practice, for the monitoring of patient dose in external radiation therapy. Three of the most common dosimeter categories are the thermoluminescence (TLDs), the radiophotoluminescence (RPLs) and the optically stimulated luminescence (OSLs), with similar physical processes on their properties. The aim of the present study is to compare and evaluate the dosimetric properties of three specific luminescent detectors namely: a) RPL glass dosimeter, commercially known as GD-301, b) lithium fluoride TLD-100 (LiF:Mg,Ti) and c) carbon-doped aluminum oxide (Al2O3:C). For this purpose, Monte Carlo simulations were applied, using the MCNP5 code to estimate the responses of these dosimeters in terms of absorbed dose, output factor, the angular and energy dependence. In the present study, we found that the differences between the output factors were less than ± 4.2% for all detector materials RPLGD, TLD and OSLD. The variations in sensitivity for angles up to ± 80 degrees from the central axis of the beam were approximately 0.5%, 0.8% and 1.5% for the TLD-100, GD-301 and Al2O3:C, respectively. The energy dependence of the RPL and OSL dosimeters are stated as less than a 2.2%, and within 5.8% for TLD.

  13. Production dosimeter LiF: Mg, Ti and comparison its responses with dosimeter LiF: Mg, Ti (TLD-100 in Harshaw company against of gamma rays

    Directory of Open Access Journals (Sweden)

    KH Mohammadi

    2010-03-01

    Full Text Available Thermoluminescence dosimeters are small tablets used with 3. 2*3. 2*0. 9mm^3 for measurement of received dose from radioactive various beams. The most common dosimeter is TLD-100 which is lithium-fluoride family and this dosimeter contain magnesium impurities. In this study, first lithium-flouride powder was mixed with titanium and controlled atmosphere samples were heated. After measuring of samples density and hardness, their glow curves were drawn and microscopic pictures of producted samples were provided. Of course, the reader should know that the best press pressure, the best range of temperature heating and the best range of samples heating were determined in 6-8 (ton/cm2, 775-800 ° C and 15-20 h, respectively [1]. Then, the response of producted TLD-100 under radiation of gamma sources, 60Co, was measured in 500 mSv rate and obtained values were compared with obtained values by Harshaw producted samples. Dosimetry characteristics of producted samples was evaluated according to ASTM E 668-00, IEC-ISO 1066 standards. The results of comparisions indicate good agreements between producted sample and Harshaw sample.

  14. Proton/gamma relative thermoluminescence efficiencies of LiF:Mg,Cu,P+PTFE prepared at ININ and TLD-100H

    International Nuclear Information System (INIS)

    Avila, O.; Gonzalez, P.; Murillo, G.

    2009-10-01

    Properties of LiF:Mg,Cu,P+PTFE dosemeters developed at ININ have been investigated in order to evaluate their performance compared to those of equivalent commercial dosemeters. In this work both LiF:Mg,Cu,P+PTFE and TLD-100H pellets were exposed to low fluence 3 MeV protons and to low dose gamma radiation to evaluate experimental proton/gamma efficiencies. Gamma irradiation was performed using the Vic krad irradiator at ININ at varying doses between 25 and 500 mGy. For proton irradiation the Tandem Van de Graaff accelerator at ININ was used. Dosemeters were placed on a holder inside a scattering chamber where protons impinge on a gold target and scatter in all directions. The holder allows for several angular positions so that dosemeters receive proton fluence between 10 6 and 10 1 0 p/cm 2 . Experimental efficiency values found for LiF:Mg,Cu,P+PTFE and TLD-100H were 0.18 +- 03 and 0.23 +- 0.03, respectively. These results allow to confirm the reliability of the dosemeters developed at ININ. (Author)

  15. Experimental determination of relative light conversion factors of TLD-100 for protons with energies from 2.0 to 9.0 MeV

    International Nuclear Information System (INIS)

    Schmidt, P.; Fellinger, J.; Huebner, K.; Henniger, J.

    1985-01-01

    Relative light conversion factors (RLCF) for heavy charged particles (protons, deuterons, recoils) are needed for the calculation of the neutron sensitivity of thermoluminescent (TL) detectors. Such light conversion factors can be determined experimentally. A method is represented for the experimental determination of RLCF. The described experimental facility gives the possibility of irradiation of different luminophor samples with heavy charged particles and flux determination and particle spectrometry at the same time. For the determination of RLCF the doses are needed which are applicated at the irradiation with heavy charged particles and gamma radiation, respectively, and the according detector readings at the TL evaluation. The problems arising at the dose determination are discussed. With this experimental facility the RLCF for TLD-100 for protons were determined. The relative light conversion factors determined according to the light sum method as well as the peak height method are summarizinhly represented and discussed. Furthermore a comparison of the glow curves is made after gamma and proton irradiation

  16. Experimental determination of relative light conversion factors of TLD-100 for protons with energies from 2.0 to 9.0 MeV

    International Nuclear Information System (INIS)

    Schmidt, P.; Fellinger, J.; Henniger, J.; Huebner, K.

    1988-01-01

    The efficiency of thermoluminescent (TL) detectors to heavy charged particles is described by the so-called light conversion factor η. Relative light conversion factors for protons, alphas and heavier recoils are needed for the calculation of the neutron sensitivity of TL detectors. Such light conversion factors can be determined experimentally. In this paper a method is presented for the experimental determination of relative light conversion factors. Using the experimental arrangement described, relative light conversion factors for LiF material (TLD-100) for protons were determined. In LiF the relative main peak (peak V) efficiency is always lower than 1. It increases with increasing proton energy whereas the relative efficiency of the high temperature peak (peak VI) shows an opposite dependence on the proton energy. Relative light conversion factors for peak VI clearly exceed 1. (orig.)

  17. Las finanzas personales

    Directory of Open Access Journals (Sweden)

    Luis Olmedo Figueroa Delgado

    2013-08-01

    Full Text Available El éxito en la administración de las finanzas personales puede provenir de diversos estamentos, sin embargo, se estructura un elemento esencial que permite tomar decisiones consientes y más coherentes en el quehacer diario, el cual es el “presupuesto”, es por ello que en este articulo artículo se tomara esta herramienta financiera como elemento pivote que cumplirá dos fines principales: El resultado lógico y eficiente de una serie de actividades cotidianas que permite tomar decisiones en beneficio personal, en donde podremos entender el vocablo personal si se quiere familiar y el punto de partida para elaborar alguna estrategia que genere un rediseño los gastos o las inversiones actualmente realizadas y de esta manera encontrar un bienestar adicional en la administración de las finanzas personales.

  18. Application of the Cavity theory in the calibration of the powder TLD-100 for energies of 60 Co, 137 Cs, 192 Ir and RX 50, 250 k Vp

    International Nuclear Information System (INIS)

    Loaiza C, S.P.; Alvarez R, J.T.

    2006-01-01

    A powder lot TLD-100 (LiF:Mg,Ti) in absorbed dose terms in water D w for the following radiation sources: 60 Co, 137 Cs and RX 50 and 250 k Vp is calibrated; to continuation is made a lineal interpolation of the TLD response in function of the effective energy of the sources to calibrate a source of 192 Ir. The calibration of those fields in D w are carried out with aid of the Bragg-Gray cavity theory, the one which finds implicit in the following protocols: IAEA-TRS 398 for the 60 Co and the AAPM TG61 for X Rays of 50 and 250 k Vp. Additionally the AAPM protocol TG43 to determine the D w in function of the kerma intensity S k in the case of the 137 Cs is used. The calibration curves for the response of the TLD-100 R TLD vs D w , corresponding to each one of the sources already mentioned are constructed. The R TLD vs D w by least heavy square by means of a second order polynomial that corrects the supralineality of the response is adjusted. The curves are validated by lack of LOF adjustment and by the Anderson Darling normality test. Later the factors of sensitivity (F s ) for the sources of 192 Ir: Micro Selectron and Vari Source are interpolated, used respectively in the A and B hospitals for treatments of brachytherapy of high dose rate (HDR), the expanded uncertainties associated to the D w and F s are also determined. Finally, an acrylic phantom and a couple of capsules are already sent to the hospitals mentioned, to verify a nominal D w of 2 Gy, in a case an underestimate in 5.5% in the imparted D w and in other an overestimation in a range of -1.5 to -8.0% was obtained. The obtained results in this work establish the bases for the development of a national dosimetric quality control program for brachytherapy of HDR with sources of 192 Ir. (Author)

  19. Measurement of the dose to the family members taking care of thyroid cancer patients undergoing I-131 therapy in nuclear medicine using TLD-100

    International Nuclear Information System (INIS)

    Zehtabian, M.; Dehghan, N.; Danaei Ghazanfarkhani, M.; Haghighatafshar, M.; Sina, S.

    2017-01-01

    The family members or friends of the patients undergoing treatment using radioiodine in nuclear medicine are inevitably exposed to ionization radiation. The purpose of this study is measurement of the dose received by the people taking care of the thyroid cancer patients treated by 131 I. For this purpose, the dose amounts received by 29 people accompanying patients were measured using thermoluminescence dosimeters. A badge containing three TLD-100 chips was given to each caregiver. The people were asked to wear the badges for 24 days, when they are taking care of the patients. Finally the dose to each person was estimated by averaging the readings of the three TLDs. The measured dose amounts to the people were compared with the recommendations of international commissions. According to the results obtained in this study, the amounts of dose received by the caregivers were between 0.03 and 0.38 mSv, with the average of 0.12 mSv. By comparison of the results of this study with the recommendations of International Commission on Radiological Protection (ICRP), it can be observed that the dose to family members of the patients is less than the dose constraints. However, it is recommended that the caregivers be aware of the radiation protection principles in order to reduce their dose. (authors)

  20. Comparison of the calculated absorbed dose using the Cadplan™ treatment planning software and Tld-100 measurements in an Alderson-Rando phantom for a bronchogenic treatment

    Energy Technology Data Exchange (ETDEWEB)

    Gutiérrez Castillo, J. G., E-mail: jggc59@hotmail.com [Departamento de Física, Hospital de Oncología, IMSS, CMN Siglo XXI, Cuauhtémoc 330 Col. Doctores (Mexico); Álvarez Romero, J. T., E-mail: trinidad.alvarez@inin.gob.mx, E-mail: fisarmandotorres@gmail.com, E-mail: victor.tovar@inin.gob.mx; Calderón, A. Torres, E-mail: trinidad.alvarez@inin.gob.mx, E-mail: fisarmandotorres@gmail.com, E-mail: victor.tovar@inin.gob.mx; M, V. Tovar, E-mail: trinidad.alvarez@inin.gob.mx, E-mail: fisarmandotorres@gmail.com, E-mail: victor.tovar@inin.gob.mx [SSDL, Departamento de Metrología ININ, Salazar, Estado de México 15245 (Mexico)

    2014-11-07

    To verify the accuracy of the absorbed doses D calculated by a TPS Cadplan for a bronchogenic treatment (in an Alderson-Rando phantom) are chosen ten points with the following D's and localizations. Point 1, posterior position on the left edge with 136.4 Gy. Points: 2, 3 and 4 in the left lung with 104.9, 104.3 and 105.8 Gy, respectively; points 5 and 6 at the mediastinum with 192.4 and 173.5 Gy; points 7, 8 and 9 in the right lung with 105.8, 104.2 and 104.7 Gy, and 10 at posterior position on right edge with 143.7 Gy. IAEA type capsules with TLD 100 powder are placed, planned and irradiated. The evaluation of the absorbed dose is carried out a curve of calibration for the LiF response (nC) {sup vs} {sup DW}, to several cavity theories. The traceability for the DW is obtained with a secondary standard calibrated at the NRC (Canada). The dosimetric properties for the materials considered are determined from the Hounsfield numbers reported by the TPS. The stopping power ratios are calculated for nominal spectrum to 6 MV photons. The percent variations among the planned and determined D in all the cases they are < ± 3%.

  1. Dosimetry for small fields in stereotactic radiosurgery using gafchromic MD-V2-55 film, TLD-100 and alanine dosimeters.

    Directory of Open Access Journals (Sweden)

    Guerda Massillon-J L

    Full Text Available This work investigated the suitability of passive dosimeters for reference dosimetry in small fields with acceptable accuracy. Absorbed dose to water rate was determined in nine small radiation fields with diameters between 4 and 35 mm in a Leksell Gamma Knife (LGK and a modified linear accelerator (linac for stereotactic radiosurgery treatments. Measurements were made using Gafchromic film (MD-V2-55, alanine and thermoluminescent (TLD-100 dosimeters and compared with conventional dosimetry systems. Detectors were calibrated in terms of absorbed dose to water in (60Co gamma-ray and 6 MV x-ray reference (10×10 cm(2 fields using an ionization chamber calibrated at a standards laboratory. Absorbed dose to water rate computed with MD-V2-55 was higher than that obtained with the others dosimeters, possibly due to a smaller volume averaging effect. Ratio between the dose-rates determined with each dosimeter and those obtained with the film was evaluated for both treatment modalities. For the LGK, the ratio decreased as the dosimeter size increased and remained constant for collimator diameters larger than 8 mm. The same behaviour was observed for the linac and the ratio increased with field size, independent of the dosimeter used. These behaviours could be explained as an averaging volume effect due to dose gradient and lack of electronic equilibrium. Evaluation of the output factors for the LGK collimators indicated that, even when agreement was observed between Monte Carlo simulation and measurements with different dosimeters, this does not warrant that the absorbed dose to water rate in the field was properly known and thus, investigation of the reference dosimetry should be an important issue. These results indicated that alanine dosimeter provides a high degree of accuracy but cannot be used in fields smaller than 20 mm diameter. Gafchromic film can be considered as a suitable methodology for reference dosimetry. TLD dosimeters are not

  2. Personal dosimetry TLD 100 in orthopedic surgeons exposed to ionizing radiation in Bogota - Colombia; Dosimetria personal TLD 110 en medicos ortopedistas expuestos a radiacion ionizante en Bogota - Colombia

    Energy Technology Data Exchange (ETDEWEB)

    Sierra C, B. Y.; Jimenez, Y. [Universidad Nacional de Colombia, Departamento de Fisica, Grupo de Fisica Medica, Carrera 45 No. 26-85, Bogota (Colombia); Plazas, M. C. [Hospital Universitario Fundacion Santa Fe de Bogota, Instituto de Oncologia Carlos Ardila Lulle, Calle 119, No. 7-90, 220246 Bogota (Colombia); Eslava S, J. [Universidad Nacional de Colombia, Instituto de Investigaciones Clinicas, Grupo Equidad en Salud, Carrera 45 No. 26-85, Bogota (Colombia); Groot R, H., E-mail: brigith.sierra@gmail.com [Universidad de los Andes, Laboratorio de Genetica Humana, Carrera 1 No. 18A -12, Bogota (Colombia)

    2014-08-15

    Orthopedic surgeons should be considered as professionals occupationally exposed to ionizing radiation, for using C arc (fluoroscope) an equipment of X type radiation emission, during surgical procedures for imaging generation. Some health institutes, use of C arc under uncontrolled circumstances, such a lack of dosimetry control, incomplete or absence of personnel protective elements and protective measures, which in turn, lead to a high exposition to the personnel. Materials and methods. Study of double match cohort by age and gender, was conducted, in four health institutions of second and third level of attention in Bogota city. Personal dosimetry measurements with TLD-100 dosimetry crystals in both cohorts and environmental dosimetry in each of operation rooms used for orthopedic procedures, were carry out during six months of follow up. Dosimetry crystals were read in a Harshaw 4500 - Bicron equipment, in the Medical Physics Laboratory of National University of Colombia. Results. Dosimetry measurements are compatibles with those of occupationally exposed personnel 3.44 mSv/6 m CI 95% (1.66-3.99), even does not overpass ICRP recommendations, are higher as were expect at the beginning of the study. The median of effective accumulative dose in thorax is 3,4 mSv CI 95% (1,66-3,99), higher in comparison with neck value 2,7 mSv CI 95% (1,73-3,80) and hand dosimetry 1,42 mSv CI 95% (0,96-2,34). Conclusions: Orthopedic surgeons should be considered occupational exposed to ionizing radiation, who has to accomplish to the radiological protection measures, dosimetric follow up and maintenance of the used X ray equipment. It was confirm throughout this study that dosimetry shows higher levels as expected at the beginning of the study, compatible with occupationally exposed personnel. (Author)

  3. Application of the Cavity theory in the calibration of the powder TLD-100 for energies of {sup 60} Co, {sup 137} Cs, {sup 192} Ir and RX 50, 250 k Vp; Aplicacion de la Teoria de la Cavidad en la calibracion de polvo TLD-100 para energias de {sup 60} Co, {sup 137} Cs, {sup 192} Ir y RX 50, 250 kVp

    Energy Technology Data Exchange (ETDEWEB)

    Loaiza C, S.P. [UAEM, Programa de Maestria en Fisica Medica, 50180, Toluca, Estado de Mexico (Mexico); Alvarez R, J.T. [ININ, 52750, Ocoyoacac, Estado de Mexico (Mexico)]. e-mail: sandraplc_04@yahoo.com.mx

    2006-07-01

    A powder lot TLD-100 (LiF:Mg,Ti) in absorbed dose terms in water D{sub w} for the following radiation sources: {sup 60} Co, {sup 137} Cs and RX 50 and 250 k Vp is calibrated; to continuation is made a lineal interpolation of the TLD response in function of the effective energy of the sources to calibrate a source of {sup 192} Ir. The calibration of those fields in D{sub w} are carried out with aid of the Bragg-Gray cavity theory, the one which finds implicit in the following protocols: IAEA-TRS 398 for the {sup 60} Co and the AAPM TG61 for X Rays of 50 and 250 k Vp. Additionally the AAPM protocol TG43 to determine the D{sub w} in function of the kerma intensity S{sub k} in the case of the {sup 137} Cs is used. The calibration curves for the response of the TLD-100 R{sub TLD} vs D{sub w}, corresponding to each one of the sources already mentioned are constructed. The R{sub TLD} vs D{sub w} by least heavy square by means of a second order polynomial that corrects the supralineality of the response is adjusted. The curves are validated by lack of LOF adjustment and by the Anderson Darling normality test. Later the factors of sensitivity (F{sub s}) for the sources of {sup 192} Ir: Micro Selectron and Vari Source are interpolated, used respectively in the A and B hospitals for treatments of brachytherapy of high dose rate (HDR), the expanded uncertainties associated to the D{sub w} and F{sub s} are also determined. Finally, an acrylic phantom and a couple of capsules are already sent to the hospitals mentioned, to verify a nominal D{sub w} of 2 Gy, in a case an underestimate in 5.5% in the imparted D{sub w} and in other an overestimation in a range of -1.5 to -8.0% was obtained. The obtained results in this work establish the bases for the development of a national dosimetric quality control program for brachytherapy of HDR with sources of {sup 192} Ir. (Author)

  4. Characterization of TLD-100 in powders for dosimetric quality control of 192 Ir sources used in brachytherapy of high dose rate

    International Nuclear Information System (INIS)

    Loaiza C, S.P.

    2007-01-01

    The Secondary Standard Dosimetric at the National Institute of Nuclear Research (ININ) calibrated a lot of powdered TLD-100 (LiF:Mg,Ti) in terms of absorbed dose to water D w for the energy of: 60 Co, 137C s, X rays of 250 and 50 kVp. Later on, it is carried out an interpolation of the calibration for the energy of the 192 Ir. This calibration is part of a dosimetric quality control program, to solve the problems of traceability for the measurements carried out by the users of 192 Ir sources employed in the treatments of High Dose Rate Brachytherapy (HDR) at the Mexican Republic. The calibrations of the radiation beams are made with the following protocols: IAEA TRS-398 for the 60 Co for D w , using a secondary standard ionization chamber PTW N30013 calibrated in D w by the National Research Council (NRC, Canada). AAPM TG-43 for D w in terms of the strength kerma Sk, calibrating this last one quantity for the 137 Cs radioactive source, with a well chamber HDR 1000 PLUS traceable to the University of Wisconsin (US). AAPM TG-61 for X ray of 250 and 50 kVp for D w start to Ka using field standard a Farmer chamber PTW 30001 traceable to K for the Central Laboratory of Electric Industries (CLEI, France). The calibration curves (CC) they built for the response of the powder TLD: R TLD vs D w : For the energy of 60 Co, 137 Cs, X rays of 250 and 50 kVp. Fitting them with the least square method weighed by means of a polynomial of second grade that corrects the supra linearity of the response. iii. Each one of the curves was validated with a test by lack of fitting and for the Anderson Darling normality test, using the software MINITAB in both cases. iv. The sensibility factor (F s ) for each energy corresponds to the slope of the CC, v. The F s for the two 192 Ir sources used are interpolated: one for a Micro Selectron source and the other one a Vari Source source. Finally, a couple of capsules were sent to two hospitals that have the HDR Brachytherapy with sources of 192

  5. Experimental calibration and determination of the relative response for Lif: Mg, Ti(TLD-100) dosemeters at 60Co gamma and 60 kVp X-ray energies

    International Nuclear Information System (INIS)

    Marco, M.L.; Gonzalez, L.; Delgado, V.; Vano, E.; Moran, P.

    1985-01-01

    The thermoluminescence efficiency of LiF: Mg, Ti (TLD-100) dosemeters has been determined for photon beams from 60 Co gamma rays and 60 kVp X-rays. It has been proven that light yield varies as a function of the photon energy. An experiment was performed using an X-ray beam whose spectrum has been determined by an X-ray fluorescence method. This enabled a direct calculation of the absorbed doses in the T1 material for the different operation conditions. These values and the experimental ones from measuring T1 intensities have been used to obtain the efficiency for energy X-ray spectrum. From the above values, the dosemeter T1 response, relative to 60 Co, has been evaluated. (author)

  6. Characterization of TLD-100 in powders for dosimetric quality control of {sup 192} Ir sources used in brachytherapy of high dose rate; Caracterizacion de TLD-100 en polvo para control de calidad dosimetrico de fuentes de Ir{sup 192} usadas en braquiterapia de alta tasa de dosis

    Energy Technology Data Exchange (ETDEWEB)

    Loaiza C, S.P

    2007-07-01

    The Secondary Standard Dosimetric at the National Institute of Nuclear Research (ININ) calibrated a lot of powdered TLD-100 (LiF:Mg,Ti) in terms of absorbed dose to water D{sub w} for the energy of: {sup 60}Co, {sup 137C}s, X rays of 250 and 50 kVp. Later on, it is carried out an interpolation of the calibration for the energy of the {sup 192}Ir. This calibration is part of a dosimetric quality control program, to solve the problems of traceability for the measurements carried out by the users of {sup 192}Ir sources employed in the treatments of High Dose Rate Brachytherapy (HDR) at the Mexican Republic. The calibrations of the radiation beams are made with the following protocols: IAEA TRS-398 for the {sup 60}Co for D{sub w}, using a secondary standard ionization chamber PTW N30013 calibrated in D{sub w} by the National Research Council (NRC, Canada). AAPM TG-43 for D{sub w} in terms of the strength kerma Sk, calibrating this last one quantity for the {sup 137}Cs radioactive source, with a well chamber HDR 1000 PLUS traceable to the University of Wisconsin (US). AAPM TG-61 for X ray of 250 and 50 kVp for D{sub w} start to Ka using field standard a Farmer chamber PTW 30001 traceable to K for the Central Laboratory of Electric Industries (CLEI, France). The calibration curves (CC) they built for the response of the powder TLD: R{sub TLD} vs D{sub w}: For the energy of {sup 60}Co, {sup 137}Cs, X rays of 250 and 50 kVp. Fitting them with the least square method weighed by means of a polynomial of second grade that corrects the supra linearity of the response. iii. Each one of the curves was validated with a test by lack of fitting and for the Anderson Darling normality test, using the software MINITAB in both cases. iv. The sensibility factor (F{sub s}) for each energy corresponds to the slope of the CC, v. The F{sub s} for the two {sup 192}Ir sources used are interpolated: one for a Micro Selectron source and the other one a Vari Source source. Finally, a couple of

  7. Valores personales y compromiso organizacional

    OpenAIRE

    Alicia Omar; Alicia Florencia Urteaga

    2008-01-01

    Se exploraron las relaciones entre los valores individuales y el compromiso organizacional en una muestra integrada por 429 empleados de empresas argentinas. Los sujetos completaron una hoja de datos personales, la Escala de Individualismo-Colectivismo y la de Compromiso Organizacional. La muestra total se clasificó en ocho subgrupos en función de la dicotomización por la mediana de las cuatro dimensiones axiológicas, de los cuales se seleccionaron los cuatro subgrupos más representativos, en...

  8. Use of MCNP to compare the response of dose deposited in the TLD 100, TLD 600 and TLD 700 in radiation fields due to {sup 60}Co and {sup 241}AmBe source; Uso do MCNP para comparacao das respostas de dose depositada nos TLD 100, TLD 600 e TLD 700 em campos de irradiacao devido a fontes de {sup 60}Co e {sup 241}AmBe

    Energy Technology Data Exchange (ETDEWEB)

    Cavalieri, Tassio A.; Castro, Vinicius A.; Siqueira, Paulo T.D., E-mail: tassio.cavalieri@usp.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2012-08-15

    The successes of Boron Neutron Capture Therapy (BNCT) depend on the ability to deliver an adequate irradiation field to the target cells. Neutron beams used in BNCT are mostly driven from reactors and therefore, not only have a neutron energy range which far exceeds the thermal region but also do have a great gamma component. Beam characterization and dosimetry are consequently one of the essential procedures to be overcome to properly apply this technique. One of the methods currently used in mixed field (field containing both neutron and gamma) characterization, lies on the use of a pair of detectors with distinct responses to each beam component. But this technique needs to be better understood of how each thermoluminescent dosimeter (TLD) behaves in a mixed field or in a pure field. This work presents the results of a set of simulations performed in order to analyze the response of three ordinary types of TLDs - TLD 100, TLD 600 and TLD 700 - submitted to different irradiation fields from a Cobalt source and an Americium-Beryllium source inside a paraffin disk. And is also a possible method for performing the selection and calibration of theses TLDs. (author)

  9. Cuestionario de redes personales. Red amplia

    OpenAIRE

    Sandín Esteban, Ma. Paz; Sánchez Martí, Angelina

    2012-01-01

    En el marco de una investigación más amplia sobre transiciones escolares y el papel de las redes sociales te pedimos que contestes las preguntas siguientes acerca de tus relaciones personales. Te rogamos que leas con atención las preguntas y contestes con sinceridad. Agradecemos mucho tu colaboración.

  10. Protectia datelor personale in cercetarile de marketing online

    OpenAIRE

    Carmen Balan

    2007-01-01

    Protectia datelor personale reprezinta unul dintre cele mai actuale subiecte din domeniul cercetarilor de marketing, in general, si cel al cercetarilor in mediul online, in special. Principalele aspecte la care se refera articolul sunt urmatoarele: evolutia pe plan international a cercetarilor de marketing online, prevederile Directivei 95/46/EC a Parlamentului si Consiliului European, prevederile referitoare la protectia datelor personale, din varianta revizuita a codului ICC/ESOMAR, propusa...

  11. Calibration of TLD-100 powder for energies of {sup 60} Co, {sup 137} Cs, {sup 192} Ir and RX of 250, 50 kV{sub p} in absorbed dose in water with dosimetric quality control purposes for brachytherapy of high dose rate; Calibracion de polvo TLD-100 para energias de {sup 60} Co, {sup 137} Cs, {sup 192} Ir y RX de 250, 50 kVp en dosis absorbida en agua con fines de control de calidad dosimetrico para braquiterapia de alta tasa de dosis

    Energy Technology Data Exchange (ETDEWEB)

    Loaiza C, S.P. [Programa de Maestria en Fisica Medica, Universidad Autonoma del Estado de Mexico, Paseo Tollocan S/N, esquina con Jesus Carranza, Colonia Moderna de la Cruz, 50180 Toluca, Edo. de Mexico (Mexico); Alvarez R, J.T. [Laboratorio Secundario de Calibracion Dosimetrica LSCD, Departamento de Metrologia, ININ, Carretera Federal Mexico Toluca S/N, La Marquesa, 52750 Ocoyoacac, Edo. de Mexico (Mexico)

    2006-07-01

    To help solve the traceability and quality control dosimetric problems for the users of {sup 192} Ir sources in the Mexican Republic, the Secondary Standard Dosimetric Laboratory at ININ to calibrated a batch of powder TLD- 100 (LiF: Mg,Ti) in terms of absorbed dose to water D{sub w} for the following radiation sources: {sup 60} Co, {sup 137C}s and RX 250 and 50 k Vp. Later on, the calibration is interpolated to obtain the {sup 192} Ir. The calibration radiation field is carried out with the following protocols: For the {sup 60} Co, IAEA TRS 398 protocol employing a secondary standard Farmer chamber PTW N30013, calibrated on D{sub w} at the NRC (Canada). For {sup 137} Cs the AAPM TG 43 protocol is used, in terms of air kerma strength S{sub k} determined by the air kerma K{sub a}, measured with a secondary standard chamber type thimble NE2611 traceable to the NIST (USA). For Rays X 250 and 50 k Vp, the protocol AAPM TG 61 using a tertiary standard Farmer chamber PTW 30001, with traceability to the LCIE (France) on air kerma K{sub a}. The calibration curves are built for the TLD response R{sub TLD} vs D{sub w}, they are fitted by means of a least squares fit technique with a second degree polynomial that corrects the supra linearity response. The curves are validated by the lack of fit test, and the Anderson Darling normality test. Later on, the sensibility factors are interpolated for the sources of {sup 192} Ir: Micro Selectron and Vari Source. Two capsules are sent to two hospitals to verify a nominal D{sub w} = 2 Gy, in the first one an underestimate of the D{sub w} is obtained, and in other one an overestimation is presented. Finally, the expanded uncertainty associated to D{sub w} and the F{sub s} are calculated. (Author)

  12. Personal monitoring services available at Institute for Radiation Protection of ENEA; Il servizo di dosimetria personale dell'Istituto per la Radioprotezione dell'ENEA

    Energy Technology Data Exchange (ETDEWEB)

    Fantuzzi, E.; Bonarelli, T. [ENEA Centro Ricerche Ezio Clementel, Bologna (Italy). Dipt. Ambiente

    1999-07-01

    Personnel monitoring provides the means to measure and record the radiation doses received by individual workers. The ionising radiation decree (230/95) set out the circumstances when the assessment and recording of person's exposure is legally required. Many employers issue dosemeters to staff even though there is no legal requirement to do so. This may be part of a quality assurance programme or as a reassurance measure. Dosemeter readings will serve to ensure compliance with legal dose limits and assure the employer that radiation exposure is as low as reasonably achievable. The ENEA (National Agency for New Technology, Energy and the Environment) IRP (Institute for Radiation Protection) individual monitoring service has been running for over 30 years. It offers personnel dosemeters which are based on its expertise and backed up by continual research and development. The report provides details of the dosemeters in use at IRP enable to decide which ones most suit the needs and shows IMS's organisation, customer and communications, dose reports form and administrative items. A short mention of future development will also be given. [Italian] La dosimetria individuale fornisce gli strumenti per misurare e registrare le dosi da radiazioni ionizzanti ricevute dai lavoratori esposti. Il decreto legislativo 230/95 stabilisce le circostanze in cui il monitoraggio individuale e' legalmente richiesto. Molti datori di lavoro forniscono dosimetri individuali anche quando non vi e' una richiesta legale spesso per seguire le regole di un programma di assicurazione di qualita' relativo alla radioprotezione o per ottenere una conferma che il principio ALARA sia soddisfatto. Il servzio di dosimetria personale dell'Istituto per la Radioprotezione dell'ENEA e' attivo da oltre 30 anni e offre dosimetri sviluppati sulla propria esperienza nelle tecniche dosimetriche che vengono continuamente aggiornati e adeguati rispecchiando lo stato dell

  13. Visualización de redes personales en Sarajevo

    OpenAIRE

    Aguilar Carretero, Claudia

    2005-01-01

    El concepto de “identificación” permite a las Ciencias Sociales, más que el de “identidad étnica”, analizar los procesos mediante los cuales las personas se autoidentifican e identifican a otros. A través del estudio de las redes personales de jóvenes en Sarajevo (Bosnia y Herzegovina) se muestran diferentes procesos de identificación en un contexto de fuerte exclusión étnica. La visualización de las redes personales por parte de los propios informantes constituye una fuente privilegiada de i...

  14. Aprendiendo en el aula: contando y haciendo relatos digitales personales

    OpenAIRE

    Londoño-Monroy, Gloria

    2012-01-01

    Este artículo da cuenta de una investigación cualitativa que desde una visión interpretativa y participativa, analiza cinco intervenciones realizadas entre 2008 y 2011 con alumnos de Educación Secundaria Obligatoria en Catalunya, España, para (a) describir y comprender las características del procedimiento de realización y de los productos resultantes, las condiciones y limitaciones de aplicación, y los beneficios pedagógicos que pueden ofrecer los Relatos Digitales Personales cuando son real...

  15. Mensuration of equivalent dose with personal dosemeters and instruments of radiological protection in the new operative magnitudes ICRU, for external fields of beta radiation. Part I. Study of the homogeneity of the response personal dosemeters leaves (cards G-1, TLD-100), in radiation fields of Co60

    International Nuclear Information System (INIS)

    Alvarez R, J.T.

    1994-01-01

    A sample of 40 composed personal dosemeters by cards model: G-l, (each card is made up of two TLD-100 crystals encapsulated in teflon), Harshaw trademark; those personal dosemeters present a free window and another with a filter of A1 of 171.7 mg cm -2 of mass thickness.The objective of the work is to select of this sample of 40 personal dosemeters a population with the same stocking and standard deviation. The technique used is that of comparison of stockings, (ANOVA; Variance Analysis, when samples of the same one were had size; and/or GLM, Widespread Lineal Models, when the samples were of different size), by means of the use of those Duncan statistics, SNK, Tukey, Gabriel; the results are validated proving the kindness of adjustment of the experimental data to a Normal distribution by means of the Shapiro-Wilks statistics.The experimental design used consists on a test of two vias: a via is the variable card with two levels, (crystal 1 and 2), the other via is the variable irradiation position with four levels, (LS=left superior, SR= right superior, LI= left Inferior, IR = right inferior). The irradiations carried out in blocks of four personal dosemeters in a gamma radiation beam range of Cobalt 60; carrying out three repetitions of the design. With object of proving the homogeneity of the filter of A1 in those personal dosemeters the experimental design was executed for those cards without personal dosemeters.They were also carried out tests of stockings to the readings of bottom and sensibility of the reader equipment, (Harshaw, model marks 2271), certain that doesn t exist differences for sequence of reading, but if in the stockings of the sensibility, (they were 4 different populations). The responses of the dosemeters were corrected subtracting him the reading correspondence of bottom and by sensibility of the reader equipment before subjecting them to the tests of stockings mentioned. Of the results of the tests of stockings for the cards with and

  16. Dosimetric behavior of thermoluminescent dosimeters at low doses in diagnostic radiology; Comportamiento dosimetrico de dosimetros termoluminiscentes a bajas dosis en radiodiagnostico

    Energy Technology Data Exchange (ETDEWEB)

    Del Sol F, S.; Garcia S, R.; Guzman M, J.; Sanchez G, D.; Rivera M, T. [IPN, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Av. Legaria 694, Col. Irrigacion, 11500 Mexico D. F. (Mexico); Ramirez R, G. [Hospital Juarez de Mexico, Av. IPN 5160, Col. Magdalena de las Salinas, 07760 Mexico D. F. (Mexico); Gaona, E., E-mail: susi2489@hotmail.com [Universidad Autonoma Metropolitana, Unidad Xochimilco, Calz. del Hueso 1100, Col. Villa Quietud, 04960 Mexico D. F. (Mexico)

    2015-10-15

    Thermoluminescent (Tl) characteristics of TLD-100, LiF:Mg,Cu,P, and CaSO{sub 4}: Dy the under homogeneous field of X-ray beams of diagnostic irradiation and its verification using thermoluminescent dosimetry is presented. The irradiations were performed utilizing an X-ray beam generated by a Radiology Mexican Company: MRH-II E GMX 325-AF SBV-1 model, with Rotating Anode X-Ray Tube installed in the Hospital Juarez Norte de Mexico in Mexico City. Different thermoluminescent characteristics of dosimetric material were studied, such as, batch homogeneity, Tl glow curve, Tl response as a function of X-ray dose, reproducibility and fading. Materials were calibrated in terms of absorbed dose to the standard calibration distance and positioned in a generic Phantom was used. Dose verification and comparison with the measurements made with that obtained by TLD-100 were analyzed. Preliminary results indicate the dosimetric peak appears at 243, 236 and 277 ± 5 degrees C respectively, these peaks are in agreement with that reported in the literature. Tl glow curve as a function of X-ray dose showed a linearity in the range from 1.76 mGy up to 14.70 mGy for all materials. Fading for a period of one month at room temperature showed low fading LiF:Mg,Cu,P, medium and high for TLD-100 and CaSO{sub 4}: Dy. The results suggest that the three materials are suitable for measurements at low doses in radiodiagnostic, however, for its dosimetric characteristics are most effective for individual applications: personal dosimetry and monitors limb (LiF:Mg,Cu,P), clinical dosimetry and environmental (TLD-100 and CaSO{sub 4}: Dy). (Author)

  17. Los pronombres personales sujetos: muestra general de tres ciudades

    Directory of Open Access Journals (Sweden)

    SONIA YALILY PRIETO MUÑOZ

    2011-01-01

    Full Text Available Este artículo examina la influencia de factores lingüísticos y pragmáticos como el tipo de cláusula, tiempo verbal, modo, aspecto, sintaxis, información nueva y conocida y semántica, como posibles rasgos que influyen en la expresión explícita y elisión de los pronombres personales sujetos (PPSs. Este estudio utiliza entrevistas recopiladas por dos ciudades hispanoamericanas: Bogotá y San Juan y una peninsular: Valencia, como parte del Proyecto para el estudio sociolingüístico del español de España y América (PRESEEA. Los verbos codificados se sometieron al programa estadístico SPSS (Statistical Package for the Social Sciencies, el cual permite correlacionar los PPSs presentes y ausentes en diferentes contextos.

  18. Formación docente bajo entornos personales de aprendizaje

    OpenAIRE

    Llorente Cejudo, María del Carmen

    2013-01-01

    La formación docente y los Entornos Personales de Aprendizaje (PLE) conviven en la actualidad en estrecha relación en el ámbito educativo de la enseñanza superior. Para ello, presentamos una guía para el proceso del diseño y producción de materiales para la formación del profesorado universitario, realizado desde del Proyecto de Investigación “Diseño, Producción y Evaluación en un Entorno de Aprendizaje 2.0 para la capacitación del profesorado universitario en la utilización educativa de las ...

  19. Aprendiendo en el aula: contando y haciendo relatos digitales personales

    Directory of Open Access Journals (Sweden)

    Gloria Londoño Monroy

    2012-12-01

    Full Text Available Este artículo da cuenta de una investigación cualitativa que desde una visión pluriparadigmática, interpretativa y participativa especialmente, analiza cinco intervenciones realizadas entre 2008 y 2011 con estudiantes de Educación Secundaria Obligatoria en Catalunya, España, para (a describir y comprender las características del proceso de realización y de los productos resultantes, las condiciones y las limitaciones de aplicación y los beneficios pedagógicos que pueden ofrecer los Relatos Digitales Personales cuando son realizados como proyectos prácticos de aprendizaje en un marco de Educación Formal, y (b diseñar, implementar, evaluar y perfeccionar una metodología didáctica que permita orientar su uso en procesos de enseñanza-aprendizaje centrados en los aprendices. Se explican: los fundamentos teóricos que guían la indagación y el enfoque metodológico empleado (empleando como métodos la Investigación basada en Diseño y el Estudio de Casos de tipo instrumental y múltiple; las actividades diseñadas y aplicadas con los alumnos, y por último, algunos hallazgos relevantes, considerando que estos casos incluyeron representantes de los tres tipos de aulas existentes en los institutos catalanes: regulares, de acogida y abiertas. Se pretende contribuir al conocimiento de la relación entre narrativa personal digital y educación, y facilitar y potenciar el aprovechamiento en el aula tanto de la expresión, las vivencias y las visiones de los sujetos que aprenden, como de las posibilidades de multimedialidad y multimodalidad que ofrecen las Tecnologías de Información y Comunicación.

  20. Las redes personales de apoyo en la viudedad en España

    Directory of Open Access Journals (Sweden)

    Luis Ayuso

    2012-01-01

    Full Text Available La viudedad supone un impacto emocional, económico y relacional. Este trabajo analiza las transformaciones que experimentan las redes personales de apoyo de las personas viudas. En su análisis se han realizado diferentes modelos de regresión de Poisson, en los que se examinan los efectos de variables personales, contextuales y actitudinales sobre las redes de apoyo. Los datos proceden del Social Relations and Social Support (International Social Survey Program 2001. Las conclusiones muestran el menor número de apoyos con los que cuentan las personas viudas en relación con las emparejadas, aunque son diferentes por sexo. La mayor pérdida de apoyos se produce en la red familiar secundaria. La movilidad geográfi ca aumenta la red familiar pero disminuye la de amigos. Las actitudes familiaristas y la menor confi anza social contribuyen al mantenimiento de estas redes personales.

  1. New ICRU quantities for the environmental and individual monitoring. Standardization of individual dosemeters by using external beams of photon radiation; Nuevas magnitudes ICRU para la vigilancia radiologica ambiental e individual. Calibracion de dosimetros personales usando haces externos de fotones

    Energy Technology Data Exchange (ETDEWEB)

    Brosed, A.; Delgado, A.; Granados, C. E.

    1987-07-01

    The quantities introduced by ICRU for the radiological monitoring are commented, specially those implied in individual protection against external photons. A procedure is proposed in order to standardize the individual dosemeters by using the kerma in air references of CIEMAT-JEN. The reference radiation beams are described in connection with ISO standards. Provisional values are selected for the appropriate conversion and correction factors. (Author) 23 refs.

  2. Dosimetry service participation of CIEMAT in intercomparisons 2008-2010 for personal dosimeters EURADOS; Participacion del servicio de dosimetria del CIEMAT en las intercomparaciones EURADOS 2008-2010 para dosimetros personales

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Jimenez, R.; Romero Gutierrez, A. M.; Lopez Moyano, J. L.

    2011-07-01

    Individual monitoring of workers exposed to ionizing radiation requires the use of personal dosimeters. EURADOS (European Radiation Dosimetry Group) recently organized three intercomparison exercises External Personal Dosimetry Services (EPDS): two for body dosimeters in 2008 and 2010 and one for extremity dosimeters in the year 2009.El paper shows and analyzes the results obtained by CIEMAT SDPE participation in all exercises.

  3. El registro mercantil frente a la protección de datos personales

    OpenAIRE

    Botero Giraldo, Claudia Milena

    2014-01-01

    Día a día crece la preocupación de las personas por el tratamiento que las entidades públicas y privadas dan a sus datos personales, los cuales han sido recabados en diferentes trámites, procedimientos y transacciones. En Colombia este tema ha cobrado mayor relevancia con la expedición de la Ley 1581 de 2012, conocida como Ley General de Protección de Datos Personales, que coexiste con la Ley 1266 de 2008 o Ley de Habeas Data la cual es una ley sectorial enfocada en la regul...

  4. Factores personales y familiares asociados a los problemas de comportamiento en niños

    OpenAIRE

    Rodríguez,María Clara

    2010-01-01

    Se identificaron los factores personales y familiares asociados a los problemas de comportamiento en niños. Participaron 254 escolares, entre 7 y 11 años, sus respectivos padres y docentes. Una vez obtenido el consentimiento informado, se aplicaron la Escala Multidimensional de la Conducta de Reynolds y Kamphaus; estandarizada en Medellín, Cuestionario de Evaluación de factores personales y familiares. El análisis chi-cuadrado muestra que la inconsistencia en las pautas de crianza, no vivir c...

  5. TL response of LiF: Mg, Cu, P dosemeters in function of the photon energy; Respuesta TL de dosimetros de LiF: Mg, Cu, P en funcion de la energia del foton

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez, P.R. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Azorin, J. [UAM-I, 09340 Mexico D.F. (Mexico); Furetta, C. [Universita degli Studi di Roma ' La Sapienza' , Piazzale Aldo Moro 2, 00185 Roma (Italy)

    2005-07-01

    In this work the obtained results of studying the response of dosemeters of LiF: Mg, Cu, P + Ptfe, developed in the ININ, commercial dosemeters GR200A (LiF: Mg, Cu, P) of chinese manufacture and TLD-100 (LiF: Mg, Ti) US are presented, when irradiating them with X rays 16, 24, 34.5, 42, 100 and 145 keV of effective energy, with gamma rays of 662 keV ({sup 137} Cs) and 1252 keV ({sup 60} Co). The results are presented in function of the sensitivity that the dosemeters showed normalized to gamma radiation of {sup 60} Co. It was appreciated that the dosemeters more equivalent to the tissue, they were those of LiF: Mg, Cu, P + Ptfe, while the less equivalent ones were the TLD-100. (Author)

  6. Thermoluminescent dosemeters characterization for patient dosimetry in diagnostic radiology preliminary results;Caracterizacao de dosimetros termoluminescentes para dosimetria de pacientes em radiodiagnostico - resultados iniciais

    Energy Technology Data Exchange (ETDEWEB)

    Castro, William J.; Squair, Peterson L. [Faculdade Novo Rumo, Belo Horizonte, MG (Brazil); Centro de Desenvolvimento de Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil); Gonzaga, Natalia B. [Universidade Unincor, Belo Horizonte, MG (Brazil); Centro de Desenvolvimento de Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil); Nogueira, Maria S.; Silva, Teogenes A. da [Centro de Desenvolvimento de Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)

    2009-07-01

    The determination of the metrological characteristics of thermoluminescent (TL) dosimeters plays an important role in dosimetry of patients submitted to x-ray examinations for diagnostic purpose. Entrance surface doses can be measured with TL dosimeters to verify the compliance with the diagnostic reference levels. Organ doses can be estimated through TL measurements in an anthropomorphic phantom which it allows the radiation risk assessment. In this work, LiF:Mg,Ti (TLD-100) rod and chip thermoluminescent dosimeters were characterized considering their use for patient dosimetry in computerized tomography and mammography. Preliminary results showed that TL dosimeters have a response reproducibility of 7.8% and 4.8% and homogeneity of 18.4% and 6.5% for rod and chip shapes, respectively. (author)

  7. REDES PERSONALES Y DIMENSIONES DE APOYO EN INDIVIDUOS DESMOVILIZADOS DEL CONFLICTO ARMADO

    Directory of Open Access Journals (Sweden)

    José Hernando Ávila-Toscano

    2010-01-01

    Full Text Available El objetivo de este estudio fue identificar las características de las redes personales de un grupo de individuos desmovilizados del conflicto armado colombiano. Se evaluaron diez hombres mediante un diseño descriptivo transversal de enfoque cuantitativo con la aplicación del ASSIS para medir las redes y se identificaron seis dimensiones de apoyo social. Las redes personales se visualizaron con el programa Visone 2.3.5, y se detectó que la ayuda material es la dimensión de mayor satisfacción en la muestra. Sobresalen las redes pequeñas, conformadas por familiares y con buen nivel de intimidad personal.

  8. Study of the response to neutrons of a personal dosemeter in mixed fields (n, {gamma}) in function of Hp(10); Estudio de la respuesta a neutrones de un dosimetro personal en campos mixtos (n, {gamma}) en funcion de Hp(10)

    Energy Technology Data Exchange (ETDEWEB)

    Cruzate, J.; Gregori, B.; Carelli, J.; Aguerre, L.; Discacciatti, A. [Autoridad REgulatoria Nuclear, Av. del Libertador 8250 (1429), Buenos Aires (Argentina)]. e-mail: cruzate@cae.arn.gov.ar

    2006-07-01

    In this work it is presented the theoretical study and their experimental validation of the answer of the personal dosimetro in terms of the component of neutrons of the personal equivalent dose Hpn(10) in function of the energy, in presence of fields of neutrons and range. The personal dosimetro, based on detecting termoluminiscentes (TLD), it consists of two detectors 7LiF and two 6LiF, located low filters of plastic and cadmium starting from whose information is evaluated the component range and of neutrons of the dose. Additionally it consists of a detecting CaF2, used basically to discriminate against the energy of the component range and to make the corresponding corrections on the evaluation of the dose range obtained with the 7LiF. The answer to neutrons in function of the energy, defined as the quotient among the one I number of reactions 6Li(n, a)4He taken place in each TLD and the Hpn(10), it was calculated using the code MCNPX and the library ENDF/B-VI. You model the dosimetro under the irradiation conditions proposed by the ISO8529-3. Faces monoenergeticos were simulated in the range of energy understood between 70 keV and 5 MeV. The dispersion in each one of the results of the simulation is smaller than 3%. You I study the existent relationship among the answer te6rica, reactions (n,a)/Hpn(10) and the experimental one, nC/Hpn(10), for a given thermal treatment. The factor of resulting conversion is constant in the energy and similar to 1,71 104 reacciones(n, a)/nC, with a smaller standard deviation to 10%. The experimental answer was obtained starting from the irradiations carried out in the mark of the International Intercomparacion of Dosimetria in Mixed Campos (n,) 2004 organized by the OIEA next to the PTB (Germany) and the IRSN (France). The extension of these calculations to other spectra of neutrons of fields real they will allow to obtain group of factors of application conversion in routine and accidental situations. (Author)

  9. La protección de los datos personales del menor en Internet

    OpenAIRE

    Pérez Luño, Antonio-Enrique

    2009-01-01

    I. PLANTEAMIENTO: ACTUALIDAD DE UNA PROBLEMÁTICA. II. LAS METAMORFOSIS DE LA INTIMIDAD. III. INTERNET Y LOS MENORES: NAVEGACIONES Y ABORDAJES. IV. SISTEMAS DE SEGURIDAD Y PROTECCIÓN DEL MENOR EN INTERNET. V. LA TUTELA JURÍDICA DE LOS DATOS PERSONALES DEL MENOR EN LA RED. VI. CONCLUSIÓN: LA PROTECCIÓN DE LOS MENORES EN LA RED ENTRE LAS LUCES Y LAS SOMBRAS. BIBLIOGRAFÍA De los asedios y transgresiones a la intimidad no han quedado a salvo los menores, quienes requieren una mayor atenci...

  10. Factores personales y socio-familiares asociados al consumo de sustancias adictivas en estudiantes universitarios

    OpenAIRE

    Martínez-Silvente, M.D.; Herrera-Gutiérrez, E.; Parada-Navas, J.L.

    2017-01-01

    Introducción: Una labor esencial de las universidades es contribuir a la mejora de la salud de su alumnado y demás integrantes de la comunidad educativa, atendiendo tanto a aspectos de prevención como de promoción de la salud. Con este trabajo pretendemos profundizar en el conocimiento actual de las variables personales y socio-familiares implicadas en el consumo de sustancias adictivas en estudiantes universitarios. Material y método: Para el desarrollo de este estudio hemos realizado una re...

  11. Privaciad VS Publicidad de los Datos Personales en Posesión de Autoridades

    OpenAIRE

    Dulcemaría Martínez Ruíz

    2013-01-01

    La protección de los datos personales es una obligación a cargo de los particulares y de las autoridades, dentro de la cual, tienen que velar por el cumplimiento de los principios tales como la privacidad y la confidencialidad de la información, así como de el establecimiento de una serie de medidas seguridad y de control que permitan la salvaguarda, protección, privacidad y confidencialidad de dichos datos mientras los mismos se encuentren sujetos al tratamiento de los entes públicos y/o los...

  12. S1581 solución informática de gestión de datos personales del ciudadano colombiano

    OpenAIRE

    Camargo Bedoya, Carlos Andrés

    2014-01-01

    La sensibilidad de los datos personales y los usos a que son sometidos plantean retos para su adecuada protección. A nivel mundial existen normativas a fin de proteger a los ciudadanos frente al uso inadecuado de sus datos personales, Colombia cuenta con la ley 1581 de 2012 so-bre Protección de datos personales . En este proyecto se desarrolló S1581: Solución informática de gestión de datos personales del ciudadano colombiano , con el objetivo de facilitar a los ciudadanos mediante el uso d...

  13. Determination of kinetic parameters in Tl dosemeters of LiF: Mg, Cu, P + PTFE developed in the ININ; Determinacion de parametros cineticos en dosimetros Tl de LiF: Mg, Cu, P + PTFE desarrollados en el ININ

    Energy Technology Data Exchange (ETDEWEB)

    Basurto G, B.S

    2002-07-01

    The objective of this work, is the one of determining the kinetic parameters of the dosemeter of LiF: Mg, Cu, P + Ptfe; starting from the curves Tl obtained at being irradiated with alpha radiation ({alpha}), beta ({beta}) and gamma ({gamma}). As like to compare its sensitivity with each radiation type, considering the sensitivity of the TLD-100 as the unit. In the Chapter 1, the fundamental structure of the matter is described, making emphasis in the different radiation types, and their interaction with this. In the Chapter 2, the units are described but used in the dosimetry of the radiation. In the Chapter 3, the basic concepts of the phenomenon of Tl are described and those are explained characteristic of the deconvolution method to determine the kinetics of the one phenomenon. In the Chapter 4, the methodology is detailed that was used in the elaboration of this thesis work, describing the material Tl that were considered like reference, as well as the sources of ionizing radiation, with those that the dosemeters were irradiated and the equipment in the one that the curves Tl was obtained. Reference is made to the software used to carry out the deconvolution of the curves Tl that were obtained in the one experimental development. In the Chapter 5, the obtained results of this study are presented, showing the tables of homogenization of dosemeters and the reading of the same one; they are observed the curves Tl obtained to different radiation doses (alpha, beta and gamma), the intensity Tl in function of the dose. Also they are tabulated, the obtained results in the kinetic parameters of the three different study materials (TLD-100H, USA; TLD-100, USA and LiF: Mg, Cu, P + Ptfe developed in the l.N.l.N). They are analyzed shortly for each material Tl their sensitivity to the ionizing radiation as well as their kinetic parameters. The obtained results showed that the Tl dosemeters of LiF: Mg,Cu,P + Ptfe, they presented a bigger sensitivity that the TLD-100 when

  14. Variables contextuales y personales que inciden en el comportamiento violento del niño

    Directory of Open Access Journals (Sweden)

    Antonia Pelegrín

    2008-03-01

    Full Text Available La conducta agresiva de los niños, niñas y adolescentes se encuentra favorecida por una serie de variables de riesgo, denominadas también variables predictoras. La acumulación de estas variables, a lo largo de la historia de desarrollo del niño, puede predisponerle a un patrón de comportamiento más agresivo que le dificulte la adaptación a su entorno social, familiar y escolar. Las variables implicadas en la manifestación de la conducta agresiva del niño pueden ser múltiples y se clasifican en personales, familiares, escolares y ambientales. Así, nuestro propósito ha sido comprobar la implicación de algunas variables en el desarrollo de un comportamiento más agresivo, violento y potencialmente antisocial y delictivo en los jóvenes. Para ello, los resultados que presentamos, han sido elaborados a partir de un trabajo de investigación más amplio, cuya muestra se encuentra representada por 1.800 alumnos/as de diferentes municipios de la Región de Murcia, con un rango de edad comprendido entre los 11 y 16 años. Entre los resultados más destacados, obtenemos que determinadas variables personales, sociales y educativas, parecen favorecer un comportamiento antisocial y delictivo en los jóvenes.

  15. Fortalezas Personales y Hábitos de Salud en Estudiantes Universitarios de Ciencias del Movimiento Humano

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    Kristy Barrantes-Brais

    2015-01-01

    Full Text Available El propósito de este estudio fue caracterizar y relacionar las fortalezas personales y los hábitos de salud en estudiantes universitarios de carreras de Ciencias del Movimiento Humano. Un total de 234 estudiantes (137 hombres y 97 mujeres brindaron información sobre fortalezas personales, hábitos de sueño y consumo de sustancias. Se analizaron diferencias entre grupos y correlaciones entre variables. Los resultados sugieren que las fortalezas predominantes son gratitud, curiosidad, integridad, bondad y liderazgo; se encuentran diferencias según género y carrera. Predominan los hábitos saludables, los cuales se asocian con algunas fortalezas. Los estudiantes presentan fortalezas que denotan preocupación por los demás y posibilidades de expresar y ser sensibles a las emociones. Los hábitos saludables y su relación con algunas fortalezas parecen evidenciar coherencia con las características de la unidad académica a la que pertenecen.

  16. Diarios personales del investigador como herramienta de investigación

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    CARLOS FERNANDO MAYORGA

    2008-12-01

    Full Text Available Este documento se basa en la revisión de los diarios personales de los entrevistadores que forman parte de un equipo de investigación del sur de Florida, Estados Unidos. El estudio original exploró los patrones del cuidado provisto a los adultos mayores en el hogar. Los diarios personales reflexivos estimularon una discusión más amplia del tema investigado, presentaron el aspecto humano de los datos cuantitativos y, dado el carácter sensible del tema estudiado, sirvieron para que los investigadores identificaran y exploraran sus propias emociones frente a los encuentros con los participantes del estudio. Nuestra experiencia confirma la necesidad de utilizar instrumentos metodológicos cualitativos que ayuden a revelar el fenómeno investigado "tal y como ocurre", mediante la complementación de la evidencia cuantitativa. Se argumenta que el mantenimiento de una actitud abierta y autorreflexiva, en medio del actual entusiasmo por la práctica basada en la evidencia, no solo tiene aplicación en el marco de la investigación en enfermería sino dentro del mismo ejercicio profesional

  17. Factores personales y ambientales asociados con el desplazamiento activo al colegio de los escolares españoles

    OpenAIRE

    Villa-González, Emilio

    2012-01-01

    Objetivos: Los factores personales y ambientales pueden influir en el transporte activo al colegio. Los objetivos fueron: a) examinar los patrones de los desplazamientos a la escuela entre los escolares y, b) analizar la asociaci??n de factores personales y ambientales con el desplazamiento activo a la escuela. M??todo: Los participantes fueron 745 escolares de 8,9 a??os (SD: 1,7), (363 ni??as), de cuatro colegios en la provincia de Granada. Los escolares rellenaron un cuestionario sobre e...

  18. Los Entornos Personales de Aprendizaje como estrategia de aprendizaje desde la Teoría del Actor-Red

    OpenAIRE

    Meza Cano, José Manuel; Cejas León, Roberto

    2016-01-01

    Este trabajo pretende visualizar los Entornos Personales de Aprendizaje desde el punto de vista de la Teoría del Actor-Red. En primer lugar, se describen los elementos centrales de la Teoría del Actor-Red, la visión de aprendizaje desde este enfoque, así como el concepto de actante y de simetría generalizada. Posteriormente se exponen los elementos clave de las definiciones sobre Entornos Personales de Aprendizaje y la visión del aprendizaje que defienden, centrada principalmente en el estudi...

  19. Relación del sistema ambiental universitario con el desarrollo de competencias personales y sociales

    OpenAIRE

    Guerra Mora, P.; Arnaiz García, A.; Pizarro Ruiz, J.P.; Bermúdez Rey, M.T.; Rubio Rubio, L.

    2016-01-01

    El objetivo de la investigación es analizar los sistemas ambientales del profesor en formación y su relación con la personalidad eficaz (competencias personales y sociales) desde los postulados de la Teoría Ecológica (Bronfenbrenner, 1987) y la Teoría “Mind and Brain: A Catalytic Theory of Embodiment” o Teoría Catalítica de la Personificación (Carpenter y Davia, 2005). Se parte de la hipótesis de Existe una relación significativa entre el “Sistema ambiental organización UPLA” y la “Personalid...

  20. Proposal of a postal system for Ir-192 sources calibration used in high dose rate brachytherapy with LiF:Mn:Ti thermoluminescent dosemeters; Proposta de um sistema postal para a calibracao de fontes de {sup 192} Ir, utilizadas em braquiterapia de alta taxa de dose, com dosimetros termoluminescentes de LiF: Mn: Ti

    Energy Technology Data Exchange (ETDEWEB)

    Vieira, W.S.; Borges, J.C.; Almeida, C.E.V. [Instituto de Radioprotecao e Dosimetria. CNEN Caixa Postal 37750, 22780-160, Rio de Janeiro (Brazil)

    1998-12-31

    A proposal in order to improve the brachytherapy quality control and to allow postal intercomparison of Ir-192 sources used in high dose rate brachytherapy has been presented. The LiF: Mn: Ti (TLD 100) detector has been selected for such purpose. The experimental array and the TLDs irradiation and calibration techniques, at the treatment units, have been specified in the light of more recent methodology of Ir-192 calibration sources. (Author)

  1. Seguridad y Privacidad en Carpetas Personales de Salud para Android e iOS

    Directory of Open Access Journals (Sweden)

    Belén Cruz Zapata

    2014-06-01

    Full Text Available Durante los últimos años, el uso de dispositivos móviles como teléfonos inteligentes y tabletas ha suscitado gran interés entre los proveedores de servicios de salud en el mundo de la mSalud. Las Carpetas Personales de Salud (en inglés Personal Health Record o PHR móviles proporcionan numerosas ventajas y aunque hay estudios que indican que los pacientes están dispuestos a utilizarlos, los índices de uso son aún bajos. La seguridad y la privacidad han sido identificadas como una importante barrera para lograr su amplia adopción. Haciendo uso de un método adaptado de la revisión sistemática de literatura se identificaron 24 PHRs móviles para Android e iOS. La seguridad y privacidad de estos PHRs móviles fueron evaluadas usando un cuestionario de 12 preguntas. Nuestra investigación muestra que los desarrolladores de PHRs móviles han de mejorar sustancialmente sus políticas de privacidad.

  2. Repensando la etnicidad y el transnacionalismo desde el análisis de redes personales

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    Javier Augusto Ávila Molero

    2015-12-01

    Full Text Available La etnicidad y el transnacionalismo se ha entendido desde los vínculos que los migrantes mantienen con personas de su sociedad y cultura de origen, pero no desde una vision “integral” de sus vínculos, que incluya también a personas de la sociedad de destino o de otros orígenes culturales. El artículo presenta una propuesta para “medir” la etnicidad y el transnacionalismo en los migrantes desde el análisis de las propiedades de composición de sus redes personales. Los resultados del estudio se elaboraron con una muestra de 293 redes de los siguientes colectivos migrantes: argentinos, dominicanos, peruanos, marroquíes y senegaleses en Barcelona, España. Los datos muestran que las redes de los migrantes tienen una estructura transnacional “multisituada” no solo entre los países de origen y destino sino también otros terceros y una composicón multiétnica. Los datos muestran también que entre los migrantes recientes los niveles de transnacionalismo son mayores y entre los migrantes más antiguos los niveles de transnacionalismo son mayores.

  3. La formación desde la perspectiva de los entornos personales de aprendizaje (PLE

    Directory of Open Access Journals (Sweden)

    Julio Barroso Osuna

    2012-04-01

    Full Text Available En este artículo analizamos las posibilidades educativas de los entornos personales de aprendizaje (personal learning environment como una de las estrategias tecnológicas que más auge está teniendo en los últimos tiempos. Tras una definición de lo que entendemos por dichos entornos, señalamos sus ventajas y limitaciones y, de forma específica, las posibilidades que nos ofrecen para la formación virtual, y las diferencias que establecen con los tradicionales entornos de teleformación. Al mismo tiempo, presentamos el proyecto I+D+i denominado "Diseño, producción y evaluación de un entorno de aprendizaje 2.0 para la capacitación del profesorado universitario en la utilización educativa de las tecnologías de la información y comunicación" (Dipro 2.0-EDU2009-08893, financiado por el Ministerio de Ciencia e Innovación del Gobierno de España. DIPRO 2.0 es un entorno que permite que el alumno pueda configurar su PLE a partir del empleo de diversas herramientas consideradas significativas para la formación personal y social. Este proyecto se encuentra en fase de desarrollo.

  4. Los entornos personales de aprendizaje en el marco de la educación permanente

    Directory of Open Access Journals (Sweden)

    Elvira E. Navas

    2013-01-01

    Full Text Available En este trabajo se presenta un estudio documental sobre el surgimiento, evolución y estado actual de la utilización y desarrollo de los Entornos Personales de Aprendizaje (Personal Learning Environment, PLE en el marco de la Educación Permanente o Aprendizaje para Toda la vida (Lifelong Learning. En primer lugar, se hace una revisión del concepto de Educación Permanente desde la literatura de inicios de siglo XX. A continuación, se procede a estudiar el término PLE, desde sus orígenes hasta la interpretación actual. Se presentan experiencias tanto nacionales como internacionales donde se ejemplifica de forma práctica la utilización de PLE en la educación universitaria. Finalmente, se hace una reflexión de cierre sobre las proyecciones de futuro del uso de los PLE en el marco de la educación permanente.

  5. Estructura social y sociabilidad: ¿son desiguales las redes personales?

    Directory of Open Access Journals (Sweden)

    Pablo De Grande

    2015-12-01

    Full Text Available En este trabajo se presentan los resultados de un estudio de redes personales de alcance nacional realizado en Argentina en el año 2006. Sobre una muestra de 1500 adultos, se analizan las características de vínculos interpersonales de ayuda, con la meta de describir -en contextos urbanos de la Argentina­- las dependencias observables entre los modos de sociabilidad y la posición social de los sujetos. Por medio de ello se buscó dar cuenta de las articulaciones entre las desigualdades económicas y sociales y la formación y mantenimiento de vínculos interpersonales. El capital educativo y el capital económico, junto a la ubicación en el ciclo de vida y el sexo, son las dimensiones que se utilizan en el análisis para caracterizar las diferencias en la participación en las relaciones familiares, institucionales y barriales de la población estudiada.

  6. Entornos Personales de Aprendizaje: ¿final o futuro de los EVA?

    Directory of Open Access Journals (Sweden)

    Vicente Ampudia Rueda

    2012-01-01

    Full Text Available En la última década las universidades incorporaron el uso de Tecnologías de la Información y la Comunicación (tic en los procesos académicos, a partir de dinámicas y tecnologías diversas. A diferente ritmo, iniciaron procesos de alfabetización digital que reportan experiencias significativas; más allá de los altibajos y resistencias socioculturales, establecieron ejes de acción, conformaron campus virtuales y Entornos Virtuales de Aprendizaje (eva. Sin embargo, en la actualidad surge una nueva discusión cuestionando el papel de estas aplicaciones y su futuro ante la Web 3.0 y el uso masivo de redes sociales. La reflexión se centra en cómo producir contenidos, integrar comunidades virtuales, superar la incompatibilidad tecnológica y las desventajas de la administración centralizada en línea. Ante este panorama surgen los Entornos Personales de Aprendizaje (ple por sus siglas en inglés, Personal Learning Enviroment. Pretendemos analizar la pertinencia de esta perspectiva en la UAM-Xochimilco.

  7. Interacciones personales entre docentes y estudiantes en el proceso de enseñanza aprendizaje

    Directory of Open Access Journals (Sweden)

    Artavia Granados, Jenny María

    2005-12-01

    Full Text Available Este artículo considera los resultados de un estudio de caso, que muestra las interacciones personales que se suscitan cotidianamente, en el proceso de enseñanza y aprendizaje que una docente y sus estudiantes de primer grado, comparten en el salón de clases. Como elementos del estudio, se tomaron en cuenta el tipo de relación afectiva, el nivel de participación, así como el tipo de comunicación verbal y no verbal que fomenta la docente en la relación con los estudiantes. Por último, se presenta una serie de conclusiones que permiten reflexionar acerca de aquellos aspectos que podrían resultar precisos para desarrollar los procesos educativos armoniosos y comunicativos. This article contains a brief analysis of the personal interrelations that are provoked daily, in the process of teaching and learning that sahare in the hall class, a professor and her students in first degree. As elements of the study, they were taken into account the type of affective relation, the participation level, as well as the type of verbal and nonverbal communication that foments the professor in the relation with the students. Finally, it offers a series of conclusions that allows us to reflect about those aspects that, they could be precise to develop harmonious and communicative educative processes.

  8. COMPETENCIAS PERSONALES Y PROFESIONALES APLICADAS POR GERENTES BAJO ESCENARIOS DE INCERTIDUMBRE ECONÓMICA

    Directory of Open Access Journals (Sweden)

    Jenniz La Madriz

    2016-04-01

    Full Text Available En Venezuela, las compañías de seguro están operando en un entorno económico de incertidumbre, con reducción de ingresos económicos, inflación e inestabilidad financiera. Ante este escenario, la investigación tuvo como objetivo identificar las competencias que aplican los gerentes del área de seguros, para mantener el negocio posicionado en el mercado, tomando como muestra 22 gerentes. El tipo de investigación es de campo, sustentado en los diseños mixtos secuenciales Creswell (2003. Los resultados permitieron identificar que 47,4% de los gerentes encuestados, manifestaron que de las competencias personales que ponen en práctica en su lugar de trabajo, en contextos de incertidumbre económica, están la responsabilidad - comunicación efectiva - resolución de problemas - negociación y trabajar como parte de un grupo. En cuanto a las competencias profesionales, el 52,6% respondieron que está dedicada a gestionar personal, administrar recursos, planificar - organizar estrategias y rendir resultados, bajo escenarios de incertidumbre económica.

  9. Review: Personal Effects of Divorce in Relation to Children / Recension: Efectos personales del divorcio respecto de los hijos

    Directory of Open Access Journals (Sweden)

    Teresa Duplá Marín

    2013-05-01

    Full Text Available Review: Carmen López‐Rendo Rodríguez, Personal Effects of Divorce in Relation to Children, from Classical Rome to the Spanish Civil Code, RIDROM (online 9, 2012, pp. 249–270. Recension: Carmen López‐Rendo Rodríguez, Efectos personales del divorcio respecto de los hijos, De Roma al Codigo civil español, RIDROM (online 9, 2012, Pág. 249–270.

  10. Wikipedia come attività di empowerment personale e sociale di studenti e insegnanti nel progetto “Veneto in Wikipedia”

    Directory of Open Access Journals (Sweden)

    Corrado Petrucco

    2016-11-01

    apprendimento; per gli insegnanti si registra una notevole fiducia in Wikipedia che cresce dopo l’esperienza fatta e contribuisce a considerarla strumento efficace nella didattica, motivante e di empowerment personale e sociale.

  11. El error en las cualidades personales del otro contrayente en la ley 19.947

    Directory of Open Access Journals (Sweden)

    Iñigo de la Maza Gazmuri

    2005-01-01

    Full Text Available Este artículo intenta examinar la situación actual del error en las cualidades personales del otro contrayente en la recientemente promulgada ley 19.947 sobre matrimonio civil. El trabajo comienza examinando la situación de esta especie de error con anterioridad a la dictación de la ley. A continuación sigue con el tratamiento que le prodiga la 19.947, enfatizando el rol del ius conubii y la familia como base de la sociedad en la caracterización de este tipo de error. En segundo lugar, examina la noción de cualidad personal en la ley, despejando aquellas características del sujeto que no lo son. En tercer lugar intenta determinar el significado de las expresiones "naturaleza" y "fines esenciales del matrimonio". Finalmente sugiere un doble test a los jueces para evaluar la procedencia de esta especie de error como causal de nulidad del matrimonio.This paper examines the current status of the error on personal qualities in the recently issued Civil Marriage Act N 19.947. This work begins by examining the way error was considered by the courts and the authors before this new act. it turns next to the treatment that the new act gives to error on personal qualities, highlighting the role of ius conubii and of family as a societal foundation in shaping the notion of this kind of error. Secondly, it examines what the law understands by the notion of personal quality, distinguishing it from what does not stand as such. Thirdly, it seeks to find the legal meaning of the expressions "nature" and "essential goals", applied to marriage. Finally it suggests to judges a double test to evaluate the admissibility of error as a cause for nullification of marriage.

  12. Entornos y redes personales de aprendizaje (PLE-PLN para el aprendizaje colaborativo

    Directory of Open Access Journals (Sweden)

    Victoria Marín Juarros

    2014-01-01

    Full Text Available El aprendizaje colaborativo se puede afrontar desde diferentes estrategias. En este artículo contemplamos la creación y mantenimiento de entornos y redes personales de aprendizaje (PLEs y PLNs y su integración en entornos virtuales institucionales de aprendizaje (EVEA como estrategias que facilitan y promueven el aprendizaje colaborativo, siempre desde una visión educativa en la que el alumno es autónomo en su propio aprendizaje y trabaja para el logro de metas comunes mediante la realización de actividades de forma conjunta en grupos, existiendo interdependencias positivas. Los objetivos de este trabajo son experimentar con metodologías didácticas de integración del EVEA y los PLEs, y analizar la construcción del PLE por parte de los alumnos universitarios, haciendo especial énfasis en la construcción de la red personal de aprendizaje. Para ello se empleó una metodología de diseño y desarrollo, en una asignatura universitaria de los estudios de maestro de Primaria. Los resultados de la experiencia apuntan a que los alumnos construyen sus PLEs y PLNs en base a sus nuevos conocimientos adquiridos y se produce una adecuada integración metodológica entre esos entornos y el EVEA para el aprendizaje integrado. Como conclusión proponemos un modelo de organización metodológica de integración para el aprendizaje colaborativo a modo de buena práctica.

  13. Dosimetric intercomparison in Cobalt 60 unities using TLD-100 crystals and CaSO{sub 4}: Dy + Ptfe; Intercomparacion dosimetrica en unidades de cobalto 60 usando cristales de TLD-100 y CaSO{sub 4}: Dy + PTFE

    Energy Technology Data Exchange (ETDEWEB)

    Gaona, E. [Universidad Autonoma Metropolitana Xochimilco, Mexico D.F. (Mexico); Azorin N, J. [Universidad Autonoma Metropolitana Iztapalapa, Mexico D.F. (Mexico); Perez P, M.A. [Instituto Nacional de Cancerologia, Mexico D.F. (Mexico); Castillo H, M. [Centro Medico Nacional 20 de Noviembre, ISSSTE, Mexico D.F. (Mexico); Flores F, F. [Unidad de Oncologia, Centro Medico Nacional, IMSS, Mexico D.F. (Mexico); Guzman R, L.V. [Unidad de Oncologia, Hospital General de Mexico, Mexico D.F. (Mexico)

    1999-07-01

    The purpose of this work is to design and construct a phantom in basis of thermoplastic polymer of methyl methacrylate that is reutilizable and which allows to do an analysis of the absorbed doses in thermoluminescent crystals (Tl) exposed to cobalt 60 to establish the dosimetric intercomparison in cobalt units which allows to do the follow-up of the Quality assurance programs, standardization of calibration procedures, dosimetry and TLD post intercomparison in radiotherapy. This work allows also prove new thermoluminescent materials of national manufacture developed by Juan Azorin and collaborators as the CaSO{sub 4}: Dy + Ptfe. This is a first study which is realized in Mexico with the system crystal-phantom for aims to intercomparison in cobalt 60 units. In this work participate eight unities of cobalt 60 of different trades belonging at four radiotherapy centers. The results of the dose intercomparison of the eight unities of cobalt 60 were in the range 0.95-1.13, taking in account that the values between 0.95 and 1.05 were considered acceptable in terms of the requirements by the standing legislation. (Author)

  14. Fuentes personales y familiares de los valores de socialización de los padres: un estudio multinivel

    Directory of Open Access Journals (Sweden)

    Silvia Donato

    2017-02-01

    Full Text Available Este estudio se centró en los valores de socialización de los padres, es decir los valores que los padres quieren que sus hijos adopten, y sus fuentes. En una muestra de 325 familias italianas con un hijo adolescente (14-18 años, se compararon los valores de socialización entre los padres y las madres, y se evaluaron los valores personales de los padres y el clima de valores familiares como antecedentes de los valores que los padres quisieran que sus hijos adquirieran. Para cada familia se tuvieron en cuenta a ambos padres y al adolescente, y se les pidió que completaran individualmente el Portrait Values Questionnaire. Los resultados de la Anova han revelado una diferencia significativa entre los valores de socialización de los padres y los de las madres: los padres consideran más importantes que las madres los valores de apertura al cambio y los del autocrecimiento en la educación de sus hijos. Utilizando un análisis multinivel, al incluirse tanto padres como madres dentro del contexto familiar, hemos encontrado relaciones significativas entre todos los valores personales de los padres y sus valores de socialización, por un lado, y entre el clima de valores familiares y algunos de los valores de socialización de los padres, por el otro. Contrariamente, la interacción entre los valores personales de los padres y el clima de valores familiares no contribuye en predecir los valores que los padres quieren que sus hijos adopten. Se discuten las implicaciones de esta investigación y sus posibles desarrollos

  15. Tipos de redes personales de los inmigrantes y adaptación psicológica.

    Directory of Open Access Journals (Sweden)

    Maya Jariego, Isidro

    2002-01-01

    Full Text Available Elaboramos una tipología de redes de apoyo en un colectivo de inmigrantes marroquíes (n=81, filipinos (n=69 y senegaleses (n=23 residentes en Marbella, aplicando la entrevista Mannheim de apoyo social (MISS (Veiel, 1990, 1993. Primero realizamos tres análisis de conglomerados exploratorios utilizando como variables-criterio indicadores de (1 composición familiar y étnica, (2 funciones de apoyo, y (3 tamaño y estructura de la red. Los análisis de chi-cuadrado entre las tres clasificaciones revelaron la solución de cinco clusters como la más apropiada. Para elaborar una tipología global con cinco categorías, seleccionamos siete indicadores de la red de apoyo, tomando en consideración para elegir cada variable: la diferenciación entre clusters, la saturación en una solución factorial y la matriz de correlaciones. Las variables-criterio seleccionadas fueron: disponibilidad de apoyo cotidiano psicológico, disponibilidad de apoyo instrumental en situaciones de crisis, número de compatriotas en la red de apoyo, número de españoles en la red de apoyo, número de familiares en la red de apoyo, número de no-familiares en la red de apoyo, y multiplicidad media de los vínculos. Los cinco clusters resultantes fueron (1 redes pequeñas de amigos y familiares compatriotas, (2 redes étnicas con predominio de vínculos especializados, (3 redes sinérgicas con predominio de amigos compatriotas, (4 redes étnicas de reagrupamiento familiar, y (5 redes de reagrupamiento familiar integradas en la comunidad receptora. Los tres colectivos estudiados tienen un perfil claramente diferenciado en sus redes personales: el 60% de los marroquíes se ubica en la categoría de redes más pequeñas, y el 60% de los senegaleses pertenece a grupos de compatriotas polivalentes. Por último, la tipología distingue significativamente los niveles de bienestar psicológico y el grado de utilización de servicios sociales. Los inmigrantes con redes peque

  16. Iniciativa personal y emprendedora del alumnado de Primaria y 1º ciclo Secundaria: Aspectos personales, familiares y escolares

    OpenAIRE

    Rosalia Romero Tena; Francisco Espasandín Bustelo

    2016-01-01

    Objeto: Conocer qué aspectos familiares, personales, del centro, del aula y del tipo de enseñanza fomentan la iniciativa personal y emprendedora. Describir el estado actual de la cuestión. Diseño/metodología/enfoque: Elaborar y validar el instrumento de evaluación para conocer la iniciativa personal y emprendedora del alumnado de Primaria y 1º ciclo de Secundaria. Administrar a centros andaluces el cuestionario de corte cuantitativo -ítems tipo Lickert y dicotómicos- de cuat...

  17. Factores personales y contextuales que influyen en la calidad de vida de adolescentes con discapacidad intelectual y del desarrollo

    OpenAIRE

    Blázquez Arribas, Leticia

    2016-01-01

    [ES]El objetivo de este estudio es identificar las variables personales y contextuales que influyen en la percepción de calidad de vida de adolescentes con Discapacidad Intelectual y del Desarrollo (DI/DD). Participaron 34 jóvenes con DI/DD con edades comprendidas entre los 13 y los 21 años y 10 maestros. Se aplicó el Cuestionario de Evaluación de la Calidad de Vida de alumnos adolescentes (Gómez-Vela y Verdugo, 2009) y el Cuestionario sobre Autodeterminación para Profesores (Peralta y Gonzál...

  18. Intención emprendedora en estudiantes universitarios: integración de factores cognitivos y socio-personales

    OpenAIRE

    Emilse Durán-Aponte; Diana Arias-Gómez

    2015-01-01

    Esta investigación tuvo como objetivo analizar la existencia o ausencia de relación entre la intención emprendedora y un conjunto de variables cognitivas (autoeficacia emprendedora, actitud emprendedora y estilo emocional) y variables socio-personales (sexo, experiencia laboral, trabajar actualmente, poseer una empresa familiar, vivir con padres o no) en estudiantes universitarios. Método: participaron 159 estudiantes de los cuales 73 eran mujeres y 86 hombres. A través de una regresión logís...

  19. Patrones de aprendizaje en estudiantes universitarios del M??ster en Educaci??n Secundaria: variables personales y contextuales relacionadas

    OpenAIRE

    Mart??nez-Fern??ndez, Reinaldo; Garc??a-Ravid??, L.

    2012-01-01

    En este trabajo analizamos los patrones de aprendizaje (Vermunt, 1998; 2005) en una muestra de estudiantes universitarios del M??ster en Formaci??n del Profesorado de Educaci??n Secundaria, y la relaci??n que tienen con ciertas variables personales, contextuales y el rendimiento acad??mico. Participan 101 estudiantes de Formaci??n del Profesorado de una universidad espa??ola con una edad media de 27.57, de los cuales 71.30% son mujeres. Los resultados indican que no se reprodu...

  20. PATRONES DE APRENDIZAJE EN ESTUDIANTES UNIVERSITARIOS DEL MÁSTER EN EDUCACIÓN SECUNDARIA: VARIABLES PERSONALES Y CONTEXTUALES RELACIONADAS

    OpenAIRE

    J. Reinaldo Martínez-Fernández; L. García-Ravidá

    2012-01-01

    En este trabajo analizamos los patrones de aprendizaje (Vermunt, 1998; 2005) en una muestrade estudiantes universitarios del Máster en Formación del Profesorado de Educación Secundaria, y la relación que tienen con ciertas variables personales, contextuales y el rendimiento académico. Participan 101 estudiantes de Formación del Profesorado de una universidad española con una edad media de 27.57, de los cuales 71.30% son mujeres. Los resultados indican que no se reproducen, fielmente, los pat...

  1. Redes sociales educativas como introducción a los entornos personales de aprendizaje (PLE’s)

    OpenAIRE

    Gil Mediavilla, Manuel; Ausín Villaverde, Vanesa; Lezcano Barbero, Fernando

    2012-01-01

    En este artículo se realiza un acercamiento a los entornos personales de aprendizaje o PLE’s desde uno de sus componentes fundamentales, las redes sociales. En primer lugar se hace un recorrido por sus principales características, y se detalla su clasificación, su aplicación a la docencia y algunos ejemplos de uso. Posteriormente se explican los conceptos básicos sobre redes sociales, su tipología y un análisis pormenorizado de varios servicios actuales. La conclusión consiste ...

  2. Las redes sociales a la luz de la propuesta de Reglamento general de protección de datos personales. Parte uno

    Directory of Open Access Journals (Sweden)

    Antonio Troncoso Reigada

    2012-12-01

    Full Text Available

    El estudio analiza los tratamientos de datos personales que llevan a cabo las empresas que prestan servicios de red social, teniendo en cuenta el nuevo marco jurídico que supone la propuesta de Reglamento general de protección de datos personales de la Unión Europea, que ha presentado en enero de 2012 la Comisión. El estudio analiza a quién le corresponde la responsabilidad del tratamiento y la aplicación de la excepción de las actividades personales o domésticas. Se abordan las dificultades para aplicar la Directiva 95/46/CE a las corporaciones internacionales que tienen su sede fuera de la Unión Europea y la regulación que en este punto hace la propuesta de Reglamento general de protección de datos personales. Igualmente se analiza la información, el consentimiento del interesado para el tratamiento y para las cesiones, el principio de calidad en el servicio de red social, la conservación de la información, las medidas de seguridad y los derechos de las personas, en especial el derecho al olvido en internet a la luz de la propuesta de Reglamento general de protección de datos personales.

  3. Dosimetric intercomparison in Cobalt 60 unities using TLD-100 crystals and CaSO4: Dy + Ptfe

    International Nuclear Information System (INIS)

    Gaona, E.; Azorin N, J.; Perez P, M.A.; Castillo H, M.; Flores F, F.; Guzman R, L.V.

    1999-01-01

    The purpose of this work is to design and construct a phantom in basis of thermoplastic polymer of methyl methacrylate that is reutilizable and which allows to do an analysis of the absorbed doses in thermoluminescent crystals (Tl) exposed to cobalt 60 to establish the dosimetric intercomparison in cobalt units which allows to do the follow-up of the Quality assurance programs, standardization of calibration procedures, dosimetry and TLD post intercomparison in radiotherapy. This work allows also prove new thermoluminescent materials of national manufacture developed by Juan Azorin and collaborators as the CaSO 4 : Dy + Ptfe. This is a first study which is realized in Mexico with the system crystal-phantom for aims to intercomparison in cobalt 60 units. In this work participate eight unities of cobalt 60 of different trades belonging at four radiotherapy centers. The results of the dose intercomparison of the eight unities of cobalt 60 were in the range 0.95-1.13, taking in account that the values between 0.95 and 1.05 were considered acceptable in terms of the requirements by the standing legislation. (Author)

  4. The linearity of the high temperature peaks in TLD100 for thermal neutrons and gamma rays irradiation

    International Nuclear Information System (INIS)

    Weinstein, M.; German, U.; Abraham, A.; Dubinsky, S.; Alfassi, Z.B.

    2004-01-01

    One of the problems that complicates the routine personal TL dosimetry with LiF:Mg,Ti, is the complexity of its glow curves, as many as 10 to 14 peaks have been identified at temperatures from 60 degree C to 400 degree C. Each peak may have different dosimetric characteristics, and may be differently dependent on a variety of factors, as the annealing procedure and type of radiation. It was observed already in the early years of TLD research, that when LiF is exposed to higher LET radiations, an enhanced sensitivity is obtained for the peaks in the 250 degree C region (6 and 7), compared to the usual dosimetry peaks (4 and 5, at about 200 degree C), and it was proposed to use this difference for mixed thermal neutron and gamma dosimetry. The development of sophisticated tools for glow curve analysis, especially the Computerized Glow Curve Deconvolution (CGCD), enabled accurate separation of the specific peaks and intensified the research on the various peaks properties. However, some major obstacles were detected, which diminished the attractiveness of using the high temperature peaks to discriminate between the neutron and gamma dose components. Peak 6 is very near to peak 5, which is the main dosimetry peak, and its separation from peak 5 is difficult, especially when measuring low doses. Peak 7 is more intense and well resolved, but its response was reported to be supra-linear, and therefore its use for neutron-gamma mixed dosimetry is questionable. In the present work we investigated the linearity of two regions of interest, one containing the main information from the peaks 6 and 7 and the other containing the main information from the main dosimetry peaks 4 and 5, after irradiation of the crystals with thermal neutrons and gamma rays. The irradiation was performed to relatively low doses, up to about 50mSv, which are the practical levels encountered in routine situations

  5. Energy dependence of thermoluminescent response of CaSO{sub 4}:Dy, LiF:Mg and micro LiF:Mg,Ti in clinical beams of electrons by using different simulator objects; Dependencia energetica da resposta TL de dosimetros de CaSO{sub 4}:Dy, LiF:Mg e microLiF:Mg,Ti em feixes clinicos de eletrons utilizando diferentes objetos simuladores

    Energy Technology Data Exchange (ETDEWEB)

    Bravim, Amanda; Campos, Leticia Lucente, E-mail: abravin@ipen.b, E-mail: rsakuraba@einstein.b, E-mail: lcrodri@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil); Sakuraba, Roberto K.; Cruz, Jose Carlos da, E-mail: rsakuraba@einstein.b, E-mail: josecarlosc@einstein.b [Hospital Israelita Albert Einstein (HIAE), Sao Paulo, SP (Brazil)

    2011-10-26

    Yet not so widely applied in radiotherapy, the calcium sulfate doped with dysprosium (CaSO{sub 4}:Dy) is used in radioprotection and studies has been demonstrated its great potential for the dosimetry in radiotherapy. This work evaluates the energy dependence of the thermoluminescent answer of the CaSO{sub 4}:D, LiF:Mg,Ti (TLD-100) and micro LiF:Mg,Ti in clinical beams of electrons by using water simulators, PMMA and solid water

  6. Los entornos personales de aprendizaje (PLE en la enseñanza basada en la resolución de problemas: El uso del e-portafolio

    Directory of Open Access Journals (Sweden)

    Ivanovnna M. Cruz Pichardo

    2013-01-01

    Full Text Available En el trabajo se busca analizar las posibilidades que nos brindan los Entornos Personales de Aprendizaje (Personal Learning Enviroment, como estrategia educativa con un gran auge en los últimos tiempos. Tras analizar su definición, buscamos la forma de relacionar el PLE con la enseñanza de las matemáticas y en especial con la resolución de problemas y el uso del E – portafolio por ser considerada una herramienta ideal para trabajar en estos entornos personales.

  7. Las competencias personales y sociales en la enseñanza de lenguaje musical en adultos: un estudio empírico

    OpenAIRE

    Vernia Carrasco, Ana Mercedes

    2015-01-01

    Esta investigación tiene como principal propósito el estudio de la influencia de competencias personales y sociales en alumnos adultos de lenguaje musical de un contexto concreto del ámbito educativo no-formal, a partir de la evaluación de los resultados de rendimiento musical y su correlación con dichas competencias. Nuestro punto de partida plantea una necesaria adaptación del currículo de la asignatura de lenguaje musical al tratarse de alumnado adulto con competencias personales...

  8. El diseño de Entornos Personales de Aprendizaje y la formación de profesores en TIC

    OpenAIRE

    Cabero Almenara, Julio; Barroso Osuna, Julio; Llorente Cejudo, María del Carmen

    2010-01-01

    Este artículo se basa en una investigación, en fase de desarrollo, sobre Entornos Personales de Aprendizaje (PLE). Este proyecto de investigación se centra tanto el diseño como en la producción y evaluación de PLE, y tiene como principal objetivo la cualificación del personal universitario en el uso de Tecnologías de la Información y la Comunicación (TIC). La investigación presenta 4 fases revidadas, todas ellas centradas en la metodología y el plan de trabajo: a)diseño, pro...

  9. Las características personales y los valores sociales de una población urbana relacionados con la participación social

    Directory of Open Access Journals (Sweden)

    Ana Lilia Banda Castro

    2015-01-01

    Full Text Available Este estudio tuvo por objetivo identificar las características personales (ontosistema y los valores sociales (macrosistema que se relacionan con la participación social. Se encuestó a 113 habitantes de una ciudad en el noroeste de México. Se emplearon ecuaciones estructu - rales para identificar el modelo integrado por el factor características personales (ontosiste - ma con las variables autoconcepto positivo, autoconcepto negativo y autoestima positiva; el factor valores sociales (macrosistema con las variables prosocialidad, responsabilidad y justicia-igualdad y el factor participación social con las variables organización social, acciones comunitarias y toma de decisiones. El modelo propuesto corresponde con el teórico, por lo que el factor características personales (ontosistema y el factor valores (macrosistema explican el diez por ciento de la varianza para el factor participación social. Se concluyó que tanto el factor características personales (ontosistema como el factor valores (macrosistema influyen directamente a la participación social.

  10. Dose profile for electron beams obtained with CaSO{sub 4}:Ce,Eu thermoluminescent dosimeters; Perfil de dose de feixes de eletrons obtidos com dosimetros termoluminescentes de CaSO{sub 4}:Ce,Eu

    Energy Technology Data Exchange (ETDEWEB)

    Nunes, Maira G.; Rodrigues, Leticia L.C., E-mail: mgnunes@ipen.br [Instituto de Pesquisas Energerticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2012-12-15

    The calcium sulphate activated with cerium and europium (CaSO{sub 4}:Ce,Eu) thermoluminescent dosimeters (TLD) recently developed at Nuclear and Energy Research Institute as well as the calcium sulphate activated with dysprosium (CaSO{sub 4}: Dy) and lithium fluoride activated with magnesium and titanium, (LiF:Mg,Ti; TLD-100) TLDs, with long term applications in dosimetry and considered as standards, were used to obtain the dose profile for 3.43, 5.48, 8.27 and 11.67 MeV electron beams generated by a linear accelerator Clinac 2100-C (Varian) in the reference conditions defined by the TRS-398 code of practice. The routine dosimetry of the electron beams, performed with a calibrated ionization chamber, ensures that the electron beams fulfill the requirements of flatness and symmetry established in this code of practice. Thus, as the TRS-398 Code of Practice requirements are fulfilled by the measurements performed with the new TLD type, CaSO{sub 4}:Ce,Eu may be applied in clinical dosimetry of high energy electron beams. (author)

  11. Intención emprendedora en estudiantes universitarios: integración de factores cognitivos y socio-personales

    Directory of Open Access Journals (Sweden)

    Emilse Durán-Aponte

    2015-07-01

    Full Text Available Esta investigación tuvo como objetivo analizar la existencia o ausencia de relación entre la intención emprendedora y un conjunto de variables cognitivas (autoeficacia emprendedora, actitud emprendedora y estilo emocional y variables socio-personales (sexo, experiencia laboral, trabajar actualmente, poseer una empresa familiar, vivir con padres o no en estudiantes universitarios. Método: participaron 159 estudiantes de los cuales 73 eran mujeres y 86 hombres. A través de una regresión logística se encontró que una alta autoeficacia para el liderazgo de recursos claves y un bajo estilo emocional de rumiación, contribuyen con la intención de emprender. Se discuten estos resultados en el contexto latinoamericano y se recomienda el énfasis que debe hacerse en la formación de futuros profesionales universitarios orientados a emprender, dando mayor relevancia a aspectos psicológicos del individuo en vez de la visión estrictamente económica y gerencial presente en los planes de formación para emprendedores de la actualidad. Por último, la principal contribución del estudio estuvo en la combinación de factores cognitivos y socio-personales en una misma muestra, la utilización de dimensiones más claras de las variables autoeficacia y actitud emprendedora, la promoción de instrumentos validados en la población de estudio y el uso de una técnica estadística potente y multicausal, como lo es la regresión logística. Se recomienda la investigación longitudinal para comprobar si efectivamente se convierten en emprendedores y verificar los factores explicativos de ello, además, comparar los resultados con población emprendedora para establecer relaciones más claras y eliminar aquellos factores que no contribuyan en la explicación del fenómeno.

  12. PATRONES DE APRENDIZAJE EN ESTUDIANTES UNIVERSITARIOS DEL MÁSTER EN EDUCACIÓN SECUNDARIA: VARIABLES PERSONALES Y CONTEXTUALES RELACIONADAS

    Directory of Open Access Journals (Sweden)

    J. Reinaldo Martínez-Fernández

    2012-01-01

    Full Text Available En este trabajo analizamos los patrones de aprendizaje (Vermunt, 1998; 2005 en una muestrade estudiantes universitarios del Máster en Formación del Profesorado de Educación Secundaria, y la relación que tienen con ciertas variables personales, contextuales y el rendimiento académico. Participan 101 estudiantes de Formación del Profesorado de una universidad española con una edad media de 27.57, de los cuales 71.30% son mujeres. Los resultados indican que no se reproducen, fielmente, los patrones propuestos por Vermunt, aunque si se aprecia una mayor semejanza conlos resultados que otros trabajos han hallado empleando el ILS con muestras de estudiantes de Educación Secundaria. Igualmente, hallamos relaciones significativas entre el género femenino y mayorespuntuaciones en creencias y orientaciones de aprendizaje y entre la edad con mayores puntuacionesen los indicadores del patrón reproductivo y la orientación a calificaciones y certificados. Además, hallamos que los estudiantes de orientación educativa tienen menor puntuación en elpatrónreproductivo que los estudiantes de ciencias naturales. Estos resultados se discuten en el marco de la formación universitaria del profesorado de Educación Secundaria en una universidad española.

  13. Antecedentes Organizacionales y Personales de las Intenciones de Compartir Conocimiento: Apoyo, Clima y Compromiso con la Organización

    Directory of Open Access Journals (Sweden)

    Guillermina Tormo Carbó

    2011-01-01

    Full Text Available El objetivo de esta investigación es analizar de forma exploratoria el papel de tres antecedentes organizacionales y personales en las intenciones de compartir conocimiento: el apoyo, el clima y el compromiso con la organización. La muestra está formada por 168 empleados del sector cerámico, y se ha puesto a prueba un modelo de ecuaciones estructurales que contempla relaciones directas e indirectas. En concreto se analizan las relaciones directas del apoyo y el clima (específicamente las dimensiones orientación a la tarea y apoyo a la innovación sobre las intenciones de compartir conocimiento, y las relaciones indirectas de esas dos variables a través del compromiso afectivo de los empleados con su organización. Los resultados muestran que la orientación a la tarea tiene un efecto directo sobre las intenciones de compartir conocimiento, mientras que las otras dos dimensiones, el apoyo a la innovación y el apoyo organizacional, influyen de forma indirecta a través del compromiso afectivo. Al final se comentan los resultados desde un punto de vista aplicado.

  14. Propiedades psicométricas de la versión española de la Escala de Resultados Personales

    Directory of Open Access Journals (Sweden)

    Maria Carbó-Carreté

    2015-01-01

    Full Text Available Los resultados personales relacionados con la calidad de vida aportan información sobre el impacto de los apoyos individualizados y servicios ofrecidos a las personas con discapacidad intelectual. La Escala de Resultados Personales (ERP es un instrumento válido y fiable que evalúa estos resultados en base a dos partes, el autoinforme y el informe de los otros. Basándonos en la ERP, el objetivo es ofrecer un nuevo estudio psicométrico de este instrumento contemplando la participación de tres informadores implicados en la mejora de la calidad de vida: la persona con discapacidad intelectual, el profesional y un miembro de la familia. Esta aproximación supera los límites de la ERP. Para el autoinforme han participado 529 personas con discapacidad intelectual. El profesional (N=522 y el miembro de la familia (N=462 han participado separadamente en las versiones correspondientes. El estudio de fiabilidad aporta valores apropiados para los factores de primer y segundo orden (α ≥ 0,82. El análisis de la validez de constructo se ajusta al modelo teórico, particularmente en los profesionales. Según los resultados, este instrumento es adecuado para evaluar resultados personales y aportar información válida para las prácticas profesionales y las políticas sociales.

  15. La gestión del aprendizaje del estudiante universitario a través de los entornos personales

    Directory of Open Access Journals (Sweden)

    María Cristina López de la Madrid

    2012-04-01

    Full Text Available Un nuevo término aparece en los primeros años del siglo XXI, los entornos personales de aprendizaje (personal learning environments (EPA, concepto que trata de integrar el aspecto tecnológico al pedagógico del aprendizaje en un ambiente más amplio de socialización e intercambio de ideas desde una acción autogestiva. La búsqueda, selección y análisis de la información, competencias señaladas como básicas dentro de la naciente sociedad del conocimiento, así como el almacenamiento, la representación y socialización de nuevos aprendizajes son sólo algunas de las acciones a las que los estudiantes están obligados en su trayectoria escolar, y el saber operar y aprovechar la tecnología facilita en gran medida la realización de estas tareas. Para conocer el impacto que las TIC han tenido en el desarrollo de los EPA de estudiantes de nivel superior, se analizaron los resultados de una investigación cuantitativa efectuada en el Centro Universitario del Sur (CUCSur de la Universidad de Guadalajara. Algunas de las dimensiones que se incluyeron en la encuesta aplicada y que se enmarcan en la teoría sobre los EPA fueron: incremento y diversificación de la comunicación, búsqueda, manejo y socialización de la información y gestión del aprendizaje. En cuanto al aspecto tecnológico, se midió la frecuencia y el dominio que los estudiantes tienen en el uso de las TIC.

  16. Dosimetric comparison on tissue interfaces with TLD dosimeters, L-alanine, EDR2 films and Penelope simulation for a Co-60 source and linear accelerator in radiotherapy; Comparacion dosimetrica en interfaces de tejidos con dosimetros TLD, L-alanina, peliculas EDR2 y simulacion Penelope para una fuente de Co-60 y acelerador lineal en radioterapia

    Energy Technology Data Exchange (ETDEWEB)

    Vega R, J. L.; Cayllahua, F.; Apaza, D. G.; Javier, H., E-mail: josevegaramirez@yahoo.es [Universidad Nacional de San Agustin, Departamento de Fisica, Av. Independencia s/n, Arequipa (Peru)

    2015-10-15

    Percentage depth dose curves were obtained with TLD-100 dosimeters, EDR2 films and Penelope simulation at the interfaces in an inhomogeneous mannequin, composed by equivalent materials to the human body built for this study, consisting of cylindrical plates of solid water-bone-lung-bone-solid water of 15 cm in diameter and 1 cm in height; plates were placed in descending way (4-2-8-2-4). Irradiated with Co-60 source (Theratron Equinox-100) for small radiation fields 3 x 3 cm{sup 2} and 1 x 1 cm{sup 2} at a surface source distance of 100 cm from mannequin. The TLD-100 dosimeters were placed in the center of each plate of mannequin irradiated at 10 Gy. The results were compared between these measurement techniques, giving good agreement in interfaces better than 97%. This study was compared with the same characteristics of another study realized with other equivalent materials to human body not homogeneous acrylic-bone-cork-bone-acrylic. The percentage depth dose curves were obtained with mini-dosimeters L-alanine of 1 mm in diameter and 3 mm in height and 3.5 to 4.0 mg of mass with spectrometer band K (EPR). The mini-dosimeters were irradiated with a lineal accelerator PRIMUS Siemens 6 MV. The results of percentage depth dose of L-alanine mini-dosimeters show a good agreement with the percentage depth dose curves of Penelope code, better than 97.7% in interfaces of tissues. (Author)

  17. Iniciativa personal y emprendedora del alumnado de Primaria y 1º ciclo Secundaria: Aspectos personales, familiares y escolares

    Directory of Open Access Journals (Sweden)

    Rosalia Romero Tena

    2016-10-01

    Full Text Available Objeto: Conocer qué aspectos familiares, personales, del centro, del aula y del tipo de enseñanza fomentan la iniciativa personal y emprendedora. Describir el estado actual de la cuestión. Diseño/metodología: Elaborar y validar el instrumento de evaluación para conocer la iniciativa personal y emprendedora del alumnado de Primaria y 1º ciclo de Secundaria. Administrar a centros andaluces el cuestionario de corte cuantitativo -ítems tipo Likert y dicotómicos- de cuatro dimensiones: entorno cercano, centro, actividades didácticas, medios didácticos usados, clima escolar e iniciativa personal. Aportaciones y resultados: El alumno adquiere sus primeras experiencias sobre lo que significa ser una persona emprendedora de la familia y del entorno cercano. El tipo de enseñanza que se imparte el centro así como la utilización de los recursos y medios disponibles marcan el desarrollo de su actitud como persona emprendedora. Las relaciones con los compañeros y con las personas implicadas en sus vidas influyen en tener mayor o menor iniciativa ante las situaciones. Los resultados de la dimensión Iniciativa Personal  (liderazgo, creatividad, logros y percepción del control señalan que a los estudiantes de estas edades les cuesta exponer y defender sus ideas, les agrada que les enseñen de forma diferente y no tienen interés en hacer propuestas. Limitaciones: Económicas, temporales, espaciales y del modelo conceptual. Implicaciones prácticas: Los hallazgos ofrecen pautas a considerar en el diseño de programas educativos que trabajen tanto en la "sensibilización" como en la "preparación" para fomentar la actitud de iniciativa personal y emprendedora. Implicaciones sociales: Concienciar a la comunidad educativa del centro de la importancia de implicar a todos los miembros en el fomento la cultura emprendedora. Valor añadido: Cuando existe una cultura emprendedora en el centro todas las acciones están dirigidas a desarrollar esas

  18. Determinantes sociodemográficos y personales del bienestar subjetivo y psicológico en población mexicana

    OpenAIRE

    González-Villalobos, José Ángel; Marrero, Rosario Josefa

    2017-01-01

    En esta investigación el objetivo es analizar la capacidad predictiva de factores sociodemográficos y características personales sobre el bienestar subjetivo y psicológico en población mexicana. Los participantes fueron 976 adultos que cumplimentaron escalas de felicidad, satisfacción vital, emociones positivas y negativas, bienestar psicológico, los Cinco Grandes de personalidad, optimismo y autoestima. Los resultados indicaron que los factores sociodemográficos tenían un tamaño de efecto pe...

  19. Las habilidades personales y terapéuticas del psicólogo que utilice la Psicoterapia Analítica Funcional

    OpenAIRE

    Valero Aguayo, Luis; Ferro García, Rafael

    2017-01-01

    La aplicación de la Psicoterapia Analítica Funcional dentro de las terapias contextuales, hace un énfasis especial en la relación terapéutica. Las interacciones verbales entre terapeuta y cliente dentro de la sesión constituyen el contexto en directo donde realizar los cambios terapéuticos. En esta comunicación se realiza una revisión de las habilidades personales y profesionales que hacen posible que esas interacciones funcionen, que se produzcan contingencias naturales y que el cambio conse...

  20. Objetivos y manifestación de valores sociales y personales en el deporte juvenil según deportistas, padres, entrenadores y gestores*

    OpenAIRE

    Melchor Gutiérrez Sanmartín; Vicente Carratalá Deval; José Francisco Guzmán Luján; Carlos Pablos Abella

    2016-01-01

    El propósito de este trabajo ha consistido en analizar los objetivos que los distintos agentes implicados en el hecho deportivo, deportistas, padres, entrenadores y gestores, le atribuyen al deporte juvenil, así como la manifestación de valores sociales y personales asociados a la práctica deportiva de niños y jóvenes. Para ello, 46 gestores, 63 entrenadores, 333 padres y 333 deportistas cumplimentaron el cuestionario de Objetivos y Manifestaciones del Deporte, creado para esta investigación....

  1. Patrones de interacción y grupos de discusión política en las redes personales de jóvenes colombianos

    Directory of Open Access Journals (Sweden)

    Ignacio RAMOS-VIDAL

    2016-12-01

    Full Text Available Utilizamos el análisis estructural para evaluar las redes personales de participación sociopolítica de 51 jóvenes colombianos vinculados a organizaciones estudiantiles en el ámbito universitario. Las redes son cohesivas, presentan altos niveles de densidad (.53 y transitividad (.78, constan de 4 conglomerados de media y están formadas por amigos (81% y en menor medida por parientes (13%. La homofilia en función del sexo, edad y nivel educativo parece jugar un papel clave en la configuración de las redes.

  2. Modelo de análisis relativo a la protección de datos personales para proyectos de cómputo en la nube

    OpenAIRE

    González Allonca, Juan Cruz; Piccirilli, Darío; Pollo Cattaneo, María Florencia

    2016-01-01

    La información es el activo más importante de las organizaciones. Es por ello que asegurar la protección de los datos personales y la privacidad de la información durante su ciclo de vida es crucial a la hora de utilizar servicios de cómputo en la nube (Cloud Computing). El esquema de cómputo en la nube ofrece beneficios como: flexibilidad, accesibilidad, autoservicio bajo demanda, escalabilidad, gestión de grandes volúmenes de datos. Sin embargo, estas ventajas, muchas veces no contemplan...

  3. Congruencia entre los valores personales y organizacionales y su influencia con el engagement en el trabajo : estudio de caso en una organización del sector salud

    OpenAIRE

    Velásquez Gomez, Katherine Rocio

    2016-01-01

    La capacidad de gestión del personal se ha convertido en un imperativo para las organizaciones modernas. Por tanto se vienen introduciendo temas como la administración en valores y el engagement de los trabajadores. Sin embargo, la relación entre estos dos aún no ha sido estudiada. El presente estudio tiene como objetivo analizar el efecto que tiene el grado de articulación y reconocimiento de los valores organizacionales y personales y organizacionales sobre los niveles de engagement de los ...

  4. Redes sociales y correspondencia epistolar. Del análisis cualitativo de las relaciones personales a la reconstrucción de redes egocentradas

    OpenAIRE

    Imízcoz Beunza, José María; Arroyo Ruiz, Lara

    2011-01-01

    [ES] En Historia, la correspondencia epistolar privada, en cuanto medio de comunicación entre personas, es la única fuente documental que revela las interacciones directas, no mediatizadas institucionalmente, entre actores sociales. El artículo explora las posibilidades de esta fuente tanto para el análisis cualitativo e intensivo de las relaciones personales como para reconstruir la “red egocentrada” del receptor de las cartas y llevar a cabo un análisis efectivo de redes sociales, aplicando...

  5. ¿De dónde vienen las relaciones sociales? Un estudio de las redes personales en el área de Toulouse (Francia)

    OpenAIRE

    Michel Grossetti

    2014-01-01

    Una de las ideas fundamentales del análisis estructural es que, a fin de comprender las estructuras sociales, es necesario partir de las relaciones. Sin embargo, ¿de dónde vienen las relaciones? Un estudio de las redes personales en el área de Toulouse (Francia) nos permite demostrar la importancia de los círculos sociales en la génesis de las relaciones diádicas. One of the fundamental ideas of structural analysis is that, in order to understand social structures, one must begin with rela...

  6. Patrones de aprendizaje en estudiantes universitarios del Máster en Educación Secundaria : variables personales y contextuales relacionadas.

    OpenAIRE

    Martínez Fernández, J. Reinaldo

    2012-01-01

    En este trabajo analizamos los patrones de aprendizaje (Vermunt, 1998; 2005) en una muestra de estudiantes universitarios del Máster en Formación del Profesorado de Educación Secundaria, y la relación que tienen con ciertas variables personales, contextuales y el rendimiento académico. Participan 101 estudiantes de Formación del Profesorado de una universidad española con una edad media de 27.57, de los cuales 71.30% son mujeres. Los resultados indican que no se reproducen, fielmente, los pat...

  7. Las tecnologías de la información y comunicación y la protección de datos personales

    OpenAIRE

    León Carvajal, María Cristina

    2010-01-01

    En el presente ensayo se realiza un análisis de los datos personales y la protección jurídica que tienen los sujetos titulares de estos derechos. Con el fin de llegar a este objetivo se revisó varios temas, entre ellos, qué son los datos, la protección que se les debe dar, cómo se clasifican, sus principios y derechos; ya que debemos recordar que con el avance tecnológico se vuelve relevante para el derecho el estudio de este tema porque no puede ser solamente estudiado desde la visión infor...

  8. REDIMENSIONANDO EL SIGNIFICADO Y ALCANCE DE LAS COMPETENCIAS PERSONALES (RESIZING THE MEANING AND SCOPE OF PERSONAL COMPETENCIES

    Directory of Open Access Journals (Sweden)

    Climént Bonilla, Juan B.

    2012-05-01

    Full Text Available Resumen: Al paso de tres décadas, con la expansión de la economía global, el movimiento de formación por competencias ha cobrado progresiva influencia en los sectores educativo y laboral de un creciente número de países. Si bien, la literatura especializada abunda en asuntos relacionados con competencias personales, y existe una extensa, aunque relativa, variedad de definiciones sobre lo que éstas son y significan, la noción prevalente de su naturaleza y origen se restringe a marcos conceptuales considerablemente afines. Teniendo en cuenta las implicaciones de esta situación en aspectos teóricos y prácticos concernientes al fomento de las competencias, el presente artículo se adentra en la investigación teórica de sus propiedades, no sólo desde la perspectiva conceptual, sino también, y sobre todo, en el ámbito de la interacción de factores biológicos y no biológicos, que son consustanciales a la naturaleza y el desarrollo de los seres humanos. La investigación se fundamenta en el análisis de dos ejes temáticos: a la concepción estandarizada de las competencias, y b el desarrollo de las competencias en relación con factores biológicos y experienciales. De este análisis resulta un racional sobre el papel central de la educación en el desarrollo de las competencias de las personas, pertinente a los avances de la investigación neurocientífica en este campo. Las conclusiones destacan algunas inconsistencias en el fomento de competencias individuales -estandarizadas o no-, asociadas a falsos supuestos u omisiones sobre la naturaleza y formación de los seres humanos a lo largo de la vida.Abstract: Through the last three decades, with global economy expansion, the competency-based education and training movement has progressively influenced education and labor sectors of an increasing number of countries. While specialized literature abounds on issues related to personal competencies, and an extensive, although relative

  9. Características personales del líder transformacional en las contralorías municipales del Estado Zulia

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    Otilia del Socorro Bracho Parra

    2014-01-01

    Full Text Available El estudio tuvo como objetivo analizar las características personales del líder transformacional en las contralorías municipales; tomando como referencia los planteamientos de Bass y Avolio (2006, Maxwell (2007, Bass y Riggio (2006, entre otros. La investigación fue descriptiva con diseño no experimental transeccional descriptivo de campo. La población fue de 257 sujetos. Se seleccionó una muestra probabilística estratificada configurada por 157 informantes. Se utilizó un instrumento para medir la variable de estudio, el cual fue validado en su contenido y validez discriminante. El índice de confiabilidad del cuestionario correspondió a 0.984. Los datos fueron analizados con estadísticas descriptivas. Los resultados indicaron que son altas las características personales del líder transformacional en las contralorías municipales del estado Zulia. Los jefes de división como el personal administrativo coincidieron en sus apreciaciones. Lo cual les convierte en líderes propensos a ser modelos a seguir y que estimulan la motivación así como el interés de los seguidores por el logro de los objetivos organizacionales.Palabras Clave: Características personales; Liderazgo Transformacional; Contralorías Municipales.Personal characteristics of the transformational leader in the Zulia State municipal comptrollers AbstractThe study aimed to analyze the transformational leader´s characteristics in the municipal comptrollers, taking as reference the approaches by Bass and Avolio (2006, Maxwell (2007, Bass y Riggio (2006 and others. The research was descriptive with nonexperimental transactional descriptive design in the field. A stratified probability sample made of 157 informants was selected. An instrument of measuring was used to measure the variables of the study, which was validated in its content and discriminant validity. The index of reliability of the questionnaires corresponded to 0,984. Data was analyzed with descriptive

  10. Individual monitoring of external exposure in terms of personal dose equivalent, H{sub p}(d); Dosimetria personale esterna in termini di equivalente di dose personale, H{sub p}(d). Atti. Giornata di studio, Bologna, 28 febbraio 2001

    Energy Technology Data Exchange (ETDEWEB)

    Fantuzzi, E. [ENEA, Div. Protezione dell' Uomo e degli Ecosistemi, Centro Ricerche Ezio Clementel, Bologna (Italy)

    2001-07-01

    The institute for Radiation Protection of ENEA - Bologna has organised a one day-workshop on the subject: Individual monitoring of external exposure in terms of personal dose equivalent, H{sub p}(d). The aim of the workshop was the discussion of the new implications and modifications to be expected in the routine individual monitoring of external radiation, due to the issue of the Decree 241/00 (G.U. 31/8/2000) in charge since 01/01/2001. The decree set up in Italian law the standards contained in the European Directive EURATOM 96/29-Basic Standards for the Protection of Health of Workers and the General Public against Dangers arising from Ionizing Radiation. Among others, the definition of the operational quantities for external radiation for personal and environmental monitoring, H{sub p}(d) e H{sup *}(d) respectively as defined by ICRU (International Commission for Radiation Units and Measurements), requires to update the methods of measurements and calibration of the personal dosemeters and environmental monitors. This report collects the papers presented at the workshop dealing with the Personal Dose Equivalent, H{sub p}(d), the conversion coefficients, H{sub p}(d)/K{sub a} e H{sub p}(d)/{sub ,} obtained through Monte Carlo calculations published by ICRU and ICRP (International Commission for Radiation Protection), the new calibration procedures and the practical implication in the routine of individual monitoring in terms of H{sub p}(d). Eventually, in the last chapter, the answers to Frequently Asked Questions (FAQ) are briefly reported. [Italian] L'Istituto per la Radioprotezione dell'ENEA di Bologna ha organizzato una giornata di studio Dosimetria personale esterna in termini di equivalente di dose personale, H{sub p}(d). Lo scopo della giornata e' stato quello di discutere le novita' e le modifiche da apportare alle pratiche di monitoraggio dell'esposizione esterna alle radiazioni ionizzanti, a seguito dell'entrata in vigore

  11. Estimation of DNA DSB radiation damage using a solid state nanodosimeters based on glow peak 5a in LiF:Mg,Ti (TLD-100)

    International Nuclear Information System (INIS)

    Oster, L.; Haddad, J.; Horowitz, Y.S.; Biderman, S.

    2002-01-01

    We demonstrate the viability of the concept of using existing molecular nano structures in TL solid-state nanodosimeters. The concept is based on mimicking radiobiology (specifically the ionization density dependence of double strand breaks in DNA) by using the similar ionization density dependence of simultaneous electron-hole capture in spatially correlated TC/LC pairs in the thermoluminescence of LiF:Mg, Ti. This simultaneous electron-hole capture has been shown to lead to ionization density dependence in the relative intensity of peak 5a to peak 5 similar to the ratio of DSBs to SSBs for low energy He ions. (authors)

  12. Autogestión del aprendizaje en la investigación educativa sobre Entornos Personales de Aprendizaje (PLE: Una revisión de literatura

    Directory of Open Access Journals (Sweden)

    Eduardo Chaves Barboza

    2014-07-01

    Full Text Available Se estudia la autogestión del aprendizaje desde las investigaciones educativas empíricas sobre entornos personales de aprendizaje (PLE. Las investigaciones analizadas fueron obtenidas de importantes fuentes documentales (artículos en revistas indexadas, actas de congresos, libros e informes. El análisis de contenido de los trabajos permitió la generación de tres categorías: la autogestión del aprendizaje de los docentes y sus competencias en TIC; la relación entre la competencias digitales e informacionales y la autogestión de los aprendizajes; y el papel de la autogestión de los aprendizajes en el “aprender a aprender”. Son interesantes campos de trabajo emergentes en la actualidad e indudablemente tendencias para futuras investigaciones.

  13. Evaluación de los significados personales en la construcción de la función lineal

    OpenAIRE

    Torres, Fabio; Lurduy, Orlando

    2013-01-01

    En este documento se tratan los principales aspectos para el diseño de una investigación que evalúa los significados personales de los estudiantes de grado noveno en la construcción noción de función lineal. Inicia con los ejes estructurales del trabajo de grado, la revisión teórica y se expone la teoría base del trabajo enfoque ontosemiótico de la instrucción y la cognición matemática. En el último apartado, se ubica la propuesta de investigación bajo el método de investigación cualitati...

  14. Investigación educativa sobre autogestión en los Entornos Personales de Aprendizaje (PLE: Una revisión de literatura

    Directory of Open Access Journals (Sweden)

    Eduardo Chaves Barboza

    2016-11-01

    Full Text Available Se estudia la autogestión del aprendizaje desde las investigaciones educativas empíricas sobre entornos personales de aprendizaje (PLE. Las investigaciones analizadas fueron obtenidas de importantes fuentes documentales (artículos en revistas indexadas, actas de congresos, libros e informes. El análisis de contenido de los trabajos permitió la generación de tres categorías: la autogestión del aprendizaje de los docentes y sus competencias en TIC; la relación entre la competencias digitales e informacionales y la autogestión de los aprendizajes; y el papel de la autogestión de los aprendizajes en el “aprender a aprender”. Son interesantes campos de trabajo emergentes en la actualidad e indudablemente tendencias para futuras investigaciones.

  15. Diagnostic imaging and interventional radiology of the amoebic liver abscess. Personal experience; Diagnostica per immagini e radiologia interventistica degli ascessi amebici del fegato: esperienza personale

    Energy Technology Data Exchange (ETDEWEB)

    De Rosa, A. [Ospedale S. Maria di Lorento Nuovo, NA (Italy). Servizio di Radiologia; Nunziata, A. [Neapel, Presidio Sanitario Intermedio (Italy). Area di Diagnostica per Immagini; Catalano, O.; Cusati, B.; Esposito, M.; Siani, A. [Ospedale di S. Maria delle Grazie, Pozzuoli, NA (Italy). Servizio di Radiologia

    1999-10-01

    The diagnostic imaging findings in hepatic amoebiasis and the capabilities of percutaneous drainage have already been described but some debate is open on both diagnosis and treatment. It is reported the experience with the ultrasound (US) and Computed Tomography (CT) studies of the hepatic amoebic abscess and its management. [Italian] I reperti con diagnostica per immagini nell'amebiasi epatica e le possibilita' del drenaggio percutaneo sono stati gia' illustrati; esistono tuttavia controversie sul piano sia diagnostico che terapeutico. Obiettivo di questo lavoro e' quello di riportare l'esperienza personale nella diagnostica con ecografia e tomografia computerizzata (TC) e nel trattamento degli ascessi amebici del fegato.

  16. Le misure di riorganizzazione del personale alle dipendenze della p.a. Tra obiettivi di efficienza ed esigenze di razionalizzazione della spesa pubblica

    Directory of Open Access Journals (Sweden)

    Alessandro Riccobono

    2012-01-01

    Full Text Available Riassunto- Il saggio analizza le politiche di riorganizzazione del personale alle dipendenze delle p.a., alla luce delle più recenti modifiche legislative. Secondo le più recenti analisi statistiche, la Pubblica Amministrazione italiana registra, a livello strutturale, numerose inefficienze correlate all’irrazionale distribuzione delle risorse umane. Per ovviare a dette disfunzioni, il legislatore è intervenuto a più riprese sul quadro normativo in materia di mobilità, modificando sia la disciplina degli strumenti di programmazione e gestione delle risorse umane (passaggi diretti di personale, trasferimenti, comandi, distacchi e assegnazioni temporanee, sia i meccanismi regolativi per il riassorbimento delle eccedenze. Si tratta tuttavia di interventi dal carattere eccessivamente frammentario e asistematico, in quanto mossi dall’esigenza, attualmente prioritaria, di tenere in ordine i conti pubblici, anche mediante forti tagli alle dotazioni organiche. Il presente lavoro mira a ricostruire l’assetto normativo attualmente vigente, mettendo in evidenza i principali fattori di criticità scaturenti dalle modifiche legislative e proponendo alcune valutazioni d’insieme, in vista di una auspicabile riforma organica della materia. Abstract- The paper analyses legal measures concerning reorganization of public civil servant, in light of the most recent legislative changes. According to latest statistical analysis, the Italian Public Administration records several inefficiencies related with irrational distribution of human resources. To overcome these shortcomings, the lawmaker introduced some changing both on the discipline of human resources management (transfers, temporary assignments, etc. and on the mechanisms for the absorption of redundancies. However, this action still appears fragmented and unsystematic, as it was driven by the priority to keep in order public finances, also through deep cuts in human resources. This paper aims to

  17. Población estudiantil de la Universidad de Costa Rica: características socio-personales e intereses en torno a su desarrollo personal

    Directory of Open Access Journals (Sweden)

    Molina Rojas, Noilin

    2015-09-01

    Full Text Available El presente artículo presenta los resultados de una caracterización socio-personal de la población estudiantil de la Sede Rodrigo Facio de la Universidad de Costa Rica. El estudio partió de un modelo mixto de investigación, en el que se aplicaron 1237 cuestionarios, en un marco muestral de 14.635 estudiantes y se desarrollaron seis grupos focales, uno por cada área académica de la Sede. Los resultados indican que la mayoría de los y las estudiantes de la Sede cuenta con condiciones y características que favorecen su dedicación a estudiar tiempo completo. No obstante, pese a una cantidad importante de estudiantes no enfrenta dificultades personales que afecten su rendimiento académico (57.2 por ciento, un 42,8 por ciento de los estudiantes sí enfrenta estas dificultades, y entre estos, un 24,3 por ciento no cuenta con redes de apoyo para hacer frente a dichas problemáticas. En torno al desarrollo personal, para la población estudiantil resulta, principalmente, de interés conocer acerca de los temas de manejo del estrés, organización del tiempo y recreación y prefiere que éstos se desarrollen de manera presencial mediante la modalidad de taller. A partir de esto, se concluye que existe la necesidad de fortalecer las ofertas presenciales de atención en torno al manejo del estrés, organización del tiempo y recreación, desde el Eje de Desarrollo Personal de la Oficina de Orientación de la Universidad de Costa Rica, a los y las estudiantes que enfrentan estos tipos de problemáticas personales, con el fin de apoyarles en su desarrollo personal y académico.

  18. POBLACIÓN ESTUDIANTIL DE LA UNIVERSIDAD DE COSTA RICA: CARACTERÍSTICAS SOCIO-PERSONALES E INTERESES EN TORNO A SU DESARROLLO PERSONAL

    Directory of Open Access Journals (Sweden)

    Noilin Molina Rojas

    2015-01-01

    Full Text Available El presente artículo presenta los resultados de una caracterización socio-personal de la población estudiantil de la Sede Rodrigo Facio de la Universidad de Costa Rica. El estudio partió de un modelo mixto de investigación, en el que se aplicaron 1237 cuestionarios, en un marco muestral de 14.635 estudiantes y se desarrollaron seis grupos focales, uno por cada área académica de la Sede. Los resultados indican que la mayoría de los y las estudiantes de la Sede cuenta con condiciones y características que favorecen su dedicación a estudiar tiempo completo. No obstante, pese a una cantidad importante de estudiantes no enfrenta dificultades personales que afecten su rendimiento académico (57.2 por ciento, un 42,8 por ciento de los estudiantes sí enfrenta estas dificultades, y entre estos, un 24,3 por ciento no cuenta con redes de apoyo para hacer frente a dichas problemáticas. En torno al desarrollo personal, para la población estudiantil resulta, principalmente, de interés conocer acerca de los temas de manejo del estrés, organización del tiempo y recreación y prefiere que éstos se desarrollen de manera presencial mediante la modalidad de taller. A partir de esto, se concluye que existe la necesidad de fortalecer las ofertas presenciales de atención en torno al manejo del estrés, organización del tiempo y recreación, desde el Eje de Desarrollo Personal de la Oficina de Orientación de la Universidad de Costa Rica, a los y las estudiantes que enfrentan estos tipos de problemáticas personales, con el fin de apoyarles en su desarrollo personal y académico.

  19. Entornos Personales de Aprendizaje (PLE: Valoración Educativa a través de Expertos / Personal environments of learning (PEL: educational valuation through experts

    Directory of Open Access Journals (Sweden)

    Julio Cabero Almenara

    2015-06-01

    Full Text Available Los Entornos personales de aprendizaje (PLE se están configurando como una de las estrategias más novedosas para incorporar las tecnologías de la información a los procesos de enseñanza-aprendizaje. Desde la investigación denominada “Diseño, producción y evaluación de un entorno de aprendizaje 2.0 para la capacitación del profesorado universitario en la utilización de las Tecnologías de la Información y la Comunicación (TIC”, y a través del presente estudio damos respuesta al objetivo fundamental que hace referencia a los resultados obtenidos mediante la evaluación de los entornos producidos, siguiendo para ello la estrategia de valoración por los expertos de las diferentes dimensiones que componían el diseño de los entornos formativos, tales como: aspectos técnicos y estéticos, facilidad de navegación, o calidad didáctica de los elementos que los configuran, obteniendo resultados muy significativos por parte de los expertos, como por ejemplo, la adecuación de herramientas que los componen, entre otros.

  20. El padrón electoral mexicano: análisis demográfico e innovaciones tecnológicas y seguridad de datos personales, 2011

    Directory of Open Access Journals (Sweden)

    Marco Antonio BAÑOS-MARTÍNEZ

    2012-01-01

    Full Text Available El padrón electoral mexicano es un instrumento integrado por más de 84 millones de registros recopilados en aproximadamente 21 años de constante innovación tanto en el acopio de datos como en los instrumentos tecnológicos empleados para su permanente construcción, mantenimiento y actualización. El documento presenta dos objetivos centrales: el primero consiste en analizar la estructura demográfica del instrumento electoral, así como resaltar las innovaciones tecnológicas más importantes que el Instituto Federal Electoral (ife ha aplicado a la Credencial para Votar con fotografía y la Lista nominal de electores. El segundo objetivo consiste en analizar la legislación en lo relativo a la protección de los datos personales y la manera en que el ife ha implementado tecnologías para el resguardo de los mismos.

  1. Redes sociales y correspondencia epistolar. Del análisis cualitativo de las relaciones personales a la reconstrucción de redes egocentradas

    Directory of Open Access Journals (Sweden)

    José María Imízcoz Beunza

    2011-12-01

    Full Text Available En Historia, la correspondencia epistolar privada, en cuanto medio de comunicación entre personas, es la única fuente documental que revela las interacciones directas, no mediatizadas institucionalmente, entre actores sociales. El artículo explora las posibilidades de esta fuente tanto para el análisis cualitativo e intensivo de las relaciones personales como para reconstruir la “red egocentrada” del receptor de las cartas y llevar a cabo un análisis efectivo de redes sociales, aplicando los métodos y parámetros del “Social Network Analysis”. A partir de dos ejemplos centrados en epistolarios del siglo XVIII, los autores muestran las posibilidades y limitaciones de los análisis cualitativos clásicos y el interés de las aportaciones específicas del análisis de redes egocentradas, abogando por la combinación de ambas metodologías.

  2. Valores personales e interpersonales en adolescentes y adultos de la ciudad de Medellín y el área metropolitana

    Directory of Open Access Journals (Sweden)

    Jorge Emiro Restrepo

    2009-01-01

    Full Text Available En este artículo se presentan los resultados de una investigación en Psicología Social, que tuvo como objetivo evaluar seis valores personales y seis valores interpersonales, a través de dos cuestionarios en los diferentes estratos socioeconómicos de una muestra de 970 personas en Medellín y el área metropolitana. El objetivo principal del proyecto fue determinar si existían diferencias estadísticas significativas entre los estratos socioeconómicos en cada uno de los doce valores evaluados. Como hallazgo relevante del estudio se resalta el hecho de que no se encontraron diferencias significativas entre los valores estadísticos de las medias para ninguno de los valores entre los diferentes estratos. La comparación gráfica de los valores de las medias para cada uno de los seis valores evaluados por cada cuestionario (SPV y SIV no evidencio, tampoco, diferencias considerables entre las poblaciones argentina y española en relación con la muestra colombiana: un hallazgo interesante para la psicología transcultural.

  3. Evaluación de la integración relacional de los inmigrantes en uniones mixtas a partir del análisis de redes personales

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    Verónica de Miguel Luken

    2015-01-01

    Full Text Available Desde principios de la última década el número de matrimonios mixtos ha crecido considerablemente. En este artículo presentamos resultados que intentan clarificar la relación entre uniones mixtas e integración social, a partir del análisis de datos primarios de entrevistas en profundidad con delineación de redes personales. Los resultados sobre composición y estructura de las redes muestran una presencia más numerosa de españoles en las redes de uniones mixtas, en gran parte familiares agregados por la pareja, que se incorporan antes y tienen más vínculos con otros inmigrantes. Sin embargo, el papel de la pareja española no es más central que el de la inmigrada, ni la proximidad emocional a los autóctonos es mayor en el caso de las uniones mixtas. Los análisis de dos redes particulares sugieren procesos diversos y complejos en la configuración de los entramados de relaciones en el destino.

  4. Tipos de apoyo y la digitalización de las redes personales. El uso de Facebook de adolescentes rururbanos de Mendoza (Argentina

    Directory of Open Access Journals (Sweden)

    Alejandro Paredes

    2015-06-01

    Full Text Available El objetivo de este trabajo es analizar la red social virtual (en este caso Facebook de adolescentes que asisten a un colegio rururbano marginal de Mendoza (Argentina, y estudiar las percepciones que ellos manifiestan sobre los tipos de apoyo que les brinda. Se tomó a un curso del último año de una escuela secundaria compuesto por 23 alumnos de una edad promedio de 17 años (el 67% eran mujeres. En su mayoría provienen de familias cuyos padres no poseen ingresos estables. La metodología utilizada es la propia del análisis de redes sociales (realización de grafos con el software TouchGraph, análisis de centralidad, subgrupos y nodos de la red, aplicación de métodos estadísticos y metodología cualitativa (entrevistas individuales y Focus group. Con respecto al estudio de las redes personales a través del uso de Facebook, se apreció una masividad en el uso de esta red (solo dos casos no lo utilizan, no existiendo diferencias significativas según el género, en el número de amigos. Finalmente desde la percepción de los estudiantes, Facebook sirve para reforzar el apoyo informacional, tangible y afectivo, pero no tanto el apoyo axiológico.

  5. Competencias personales docentes para la educación inclusiva: una reflexión sobre lo que está ocurriendo en España

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    Eladio Sebastián-Heredero

    2017-11-01

    Full Text Available Desde el final del siglo pasado España viene desarrollando e implementando sus políticas de inclusión educativa. Es ahora un buen momento para hacer una reflexión de las lecciones aprendidas sobre las variables personales que el docente de la educación inclusiva debe tener desde tres perspectivas: su formación inicial, las que exige de la formación continuada en servicio y las que proceden de su práctica docente. El profesor actual precisa tener como profesional un conjunto de competencias entendidas como los recursos - conocimientos, habilidades y actitudes - que necesita para resolver de forma satisfactoria las situaciones a las que se enfrenta en su trabajo: planificar, crear y reconstruir nuevas formas de motivar y enseñar a todos; compartir conocimiento y trabajar de forma colaborativa; pero también ser líder, escuchar, usar Tecnologías de Información y Comunicación o ser miembro de un equipo y de la comunidad. Competencias cognitivas y no cognitivas entran en juego en este ensayo.

  6. Determinantes sociodemográficos y personales del bienestar subjetivo y psicológico en población mexicana

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    José Ángel González-Villalobos

    2017-01-01

    Full Text Available En esta investigación el objetivo es analizar la capacidad predictiva de factores sociodemográficos y características personales sobre el bienestar subjetivo y psicológico en población mexicana. Los participantes fueron 976 adultos que cumplimentaron escalas de felicidad, satisfacción vital, emociones positivas y negativas, bienestar psicológico, los Cinco Grandes de personalidad, optimismo y autoestima. Los resultados indicaron que los factores sociodemográficos tenían un tamaño de efecto pequeño sobre las distintas dimensiones de bienestar subjetivo y psicológico. Los análisis de regresión múltiple mostraron que, tanto el bienestar subjetivo como el psicológico, eran explicados por alta extraversión, responsabilidad, autoestima y bajo neuroticismo. Estos resultados sugieren que, no solo los Cinco Grandes, sino la autoestima es un potente predictor de ambos tipos de bienestar en mayor medida que los factores sociodemográficos. Los descubrimientos son consistentes con los encontrados en otras culturas, aunque aparecen diferencias que son discutidas con relación a cómo abordarlas por parte de las autoridades mexicanas.

  7. Lazos fuertes y proveedores múltiples de apoyo: comparación de dos formas de representación gráfica de las redes personales

    Directory of Open Access Journals (Sweden)

    ISIDRO MAYA JARIEGO

    2005-01-01

    Full Text Available En este artículo examinamos el impacto de dos formas diferentes de representación visual de las redes personales de 208 universitarios en la percepción de los observadores. Siguiendo un enfoque de experimentación, comparamos las reacciones e interpretaciones de 173 encuestados al observar gráficos de sus redes personales que representan (a los lazos fuertes o (b la multiplicidad de tipos de ayuda de un conjunto de 25 actores de su entorno personal. Los participantes mostraron preferencia por el gráfico que subraya las funciones de apoyo social de su red. A juicio de los entrevistados, el gráfico que representa la multiplicidad de los proveedores de apoyo social facilita la identificación de actores clave, aporta información más novedosa, refleja adecuadamente la posición de ego en la estructura de relaciones y es, en general, una mejor representación de su red personal. Sin embargo, la representación de los lazos fuertes facilita la identificación de agrupaciones en la red personal. Basándonos en los resultados, discutimos la pertinencia de este método de exploración, elicitación y validación de las redes personales de los encuestados.

  8. Diarios personales del investigador como herramienta de investigación Diários pessoais do pesquisador como instrumento de pesquisa Researcher's personal diary as research tool

    Directory of Open Access Journals (Sweden)

    CARLOS FERNANDO MAYORGA

    2008-12-01

    Full Text Available Este documento se basa en la revisión de los diarios personales de los entrevistadores que forman parte de un equipo de investigación del sur de Florida, Estados Unidos. El estudio original exploró los patrones del cuidado provisto a los adultos mayores en el hogar. Los diarios personales reflexivos estimularon una discusión más amplia del tema investigado, presentaron el aspecto humano de los datos cuantitativos y, dado el carácter sensible del tema estudiado, sirvieron para que los investigadores identificaran y exploraran sus propias emociones frente a los encuentros con los participantes del estudio. Nuestra experiencia confirma la necesidad de utilizar instrumentos metodológicos cualitativos que ayuden a revelar el fenómeno investigado "tal y como ocurre", mediante la complementación de la evidencia cuantitativa. Se argumenta que el mantenimiento de una actitud abierta y autorreflexiva, en medio del actual entusiasmo por la práctica basada en la evidencia, no solo tiene aplicación en el marco de la investigación en enfermería sino dentro del mismo ejercicio profesionalEste documento está baseado na revisão dos diários pessoais dos entrevistadores que fazem parte de uma equipe de pesquisa do sul de Florida, Estados Unidos. O trabalho original aprofundou nos padrões de atenção médica domiciliária para adultos maiores. Os diários pessoais reflexivos propiciaram uma discussão mais abrangente sobre o objeto da pesquisa, apresentaram o lado humano dos dados quantitativos e, considerando a natureza sensível da questão levantada, serviram para que os pesquisadores identificassem e estudassem suas próprias emoções a respeito dos encontros com os participantes do levantamento. Nossa experiência confirma a necessidade de usar instrumentos metodológicos qualitativos para desvendar o fenômeno pesquisado "na forma como ele acontece", junto com o uso complementar da evidência quantitativa. O levantamento argúi que manter

  9. Researcher's personal diary as research tool Diarios personales del investigador como herramienta de investigación Diários pessoais do pesquisador como instrumento de pesquisa

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    JIMÉNEZ LUZ DARY DARY

    2008-12-01

    Full Text Available This document is based on the revision of personal diaries of interviewers who are part of a research team in the South of Florida, United States. The original study explored the patterns of care provided to elderly people at home. The reflecting personal diaries stimulated a broaden discussion on the researched topic, presented the human aspect of quantitative data and, given the sensible character of the topic under study, served the researchers to identify and explore their own emotions prior to meeting the participants of the study. Our experience confirms the need to use qualitative mythological instruments that help reveal the phenomenon under research "just as it occurs", through complementing the quantitative evidence. The argument is that having an open and self-reflective attitude, in the middle of the current enthusiasm for practice based on evidence, is not only applicable in the framework of nursing research but within the same professional practice.Este documento se basa en la revisión de los diarios personales de los entrevistadores que forman parte de un equipo de investigación del sur de Florida, Estados Unidos. El estudio original exploró los patrones del cuidado provisto a los adultos mayores en el hogar. Los diarios personales reflexivos estimularon una discusión más amplia del tema investigado, presentaron el aspecto humano de los datos cuantitativos y, dado el carácter sensible del tema estudiado, sirvieron para que los investigadores identificaran y exploraran sus propias emociones frente a los encuentros con los participantes del estudio. Nuestra experiencia confirma la necesidad de utilizar instrumentos metodológicos cualitativos que ayuden a revelar el fenómeno investigado "tal y como ocurre", mediante la complementación de la evidencia cuantitativa. Se argumenta que el mantenimiento de una actitud abierta y autorreflexiva, en medio del actual entusiasmo por la práctica basada en la evidencia, no solo

  10. Objetivos y manifestación de valores sociales y personales en el deporte juvenil según deportistas, padres, entrenadores y gestores*

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    Melchor Gutiérrez Sanmartín

    2016-04-01

    Full Text Available El propósito de este trabajo ha consistido en analizar los objetivos que los distintos agentes implicados en el hecho deportivo, deportistas, padres, entrenadores y gestores, le atribuyen al deporte juvenil, así como la manifestación de valores sociales y personales asociados a la práctica deportiva de niños y jóvenes. Para ello, 46 gestores, 63 entrenadores, 333 padres y 333 deportistas cumplimentaron el cuestionario de Objetivos y Manifestaciones del Deporte, creado para esta investigación. Mediante análisis de componentes principales con rotación varimáx, encontramos que los objetivos del deporte se agrupan en cinco factores: autorrealización y progreso, cooperación y juego limpio, poder y deseo de triunfo, compañerismo, y diversión en el juego. Las manifestaciones del deporte aportaron las siguientes dimensiones: autorrealización y progreso, compañerismo, poder y deseo de triunfo, autocontrol y juego limpio, y logro personal. De los resultados se concluye que los gestores son más críticos con los objetivos que debe cumplir el deporte y con las manifestaciones de valores que éste ofrece, mientras los padres, entrenadores y los propios deportistas son más benévolos con la práctica del deporte juvenil, tanto en el establecimiento de objetivos como en la manifestación de valores.

  11. Efectos de un programa de juego limpio en los factores personales de la deportividad de jugadores de fútbol alevín en Cádiz

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    Javier Lamoneda Prieto

    2015-01-01

    Full Text Available A pesar de que en los últimos años han proliferado programas para el desarrollo de la deportividad, existen evidencias empíricas que corroboran la necesidad que demanda actualmente el fútbol base de un tratamiento ético. Por esta razón el objetivo del presente estudio fue elaborar un programa de intervención específicamente diseñado para jugadores de fútbol alevín centrado en la mejora de los aspectos personales de la deportividad y analizar el cambio que pudiera generar. La muestra la compusieron ciento veintiséis ( n = 126 futbolistas fe - derados con una media de edad de 10.9 años. Al grupo experimental se le aplicó un programa de educación en valores de cinco semanas de duración. Para valorar la eficacia del programa se realizó un análisis intra-grupo en el que se empleó la prueba de Wilcoxon y una inter- grupo, para el que se utilizó el test exacto de Fisher’s. Los participantes en el programa, en comparación con los que no recibieron tratamiento educativo, mejoraron su actitud ante el fracaso ( p < 0.05 . Los integrantes del grupo control empeoraron en un 70% de los aspectos analizados. Los participantes del control y experimental mejoraron la asistencia a los entrenamientos . El pro - grama no fue efectivo en dos casos: la modificación del tipo de motivación (diversión o resultado y el respeto al entrenador. Justificamos la necesidad de la implemen - tación de programas formativos en el fútbol de cantera de cara a la mejora de la actitud frente al error y como medida preventiva frente a la pérdida de valores.

  12. Production of thermoluminescent dosemeters based on MgB{sub 4}O{sub 7}: Dy and MgB{sub 4}O{sub 7}: Tm; Producao de dosimetros termoluminescentes a base de MgB{sub 4}O{sub 7}: Dy e MgB{sub 4}O{sub 7}: Tm

    Energy Technology Data Exchange (ETDEWEB)

    Souza, Luiza Freire de; Souza, Divanizia N., E-mail: luizaf25@hotmail.com, E-mail: divanizi@ufs.br [Universidade Federal de Sergipe (UFS), Sao Cristovao, SE (Brazil). Programa de Pos-Graduacao em Fisica

    2013-07-01

    The thermoluminescent dosimetry (TL) is a well-established technique for the detection of ionizing radiation in hospitals, clinics, and industrial establishments where there is the need to quantify the radiation. For this practice is require the use phosphors which are sensitive to radiation. Some phosphors are already commonly used in this practice, for example, TLD-100 (LiF: Mg, Ti), CaSO{sub 4}:Tm and CaSO{sub 4}:Dy. A compound that was most recently introduced in dosimetry and has many advantageous features to detect neutrons, electrons and gamma is the magnesium tetraborate (MgB{sub 4}O{sub 7}), but the undoped material is not good for dosimetry, since signal does not show satisfactory thermoluminescence. The present work presents the analysis of the compound MgB{sub 4}O{sub 7} when doped with rare earth elements, thulium (Tm) and dysprosium (Dy). The production of MgB{sub 4}O{sub 7}: Dy and MgB{sub 4}O{sub 7}: Tm occurred under acidic conditions. Following the process of crystal growth, several tests were made on phosphors produced to verify the quality of materials as TL dosimeter. Initially, was made the identification of the crystalline phases found in the material, using the technique of X-ray diffractometry, and then were evaluated and compared the TL emission curves of the crystals with two different types of dopants, to this, the samples were irradiated with different radiation sources: {sup 137}Cs (0,66 MeV), {sup 60}Co (1.25 MeV) and X-rays (0.41 MeV) and based on the results was evaluated the energy dependence of phosphors. Another characteristic analyzed, was the decay of TL signal for the material (fading). The results show that the material can be an excellent TL dosimeter when doped with rare earth elements Dy and Tm. (author)

  13. El uso de las TIC y herramientas de la Web 2.0 por maestros portugueses de la educación primaria y educación especial: la importancia de las competencias personales

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    Carla García

    2014-01-01

    Full Text Available Este estudio tiene como objetivo analizar el papel de las habilidades personales como las actitudes y autoeficacia en relación con el uso de las Tecnologías de la Información y la Comunicación (TIC y las herramientas Web 2.0 entre los maestros de la Enseñanza Regular y Educación Especial. Se utilizó una metodología cuantitativa en una muestra de 200 maestros de Primaria y Educación Especial. Se administró un cuestionario sobre el uso de las TIC y las herramientas de la Web 2.0, una Escala de Autoeficacia hacia el Uso del Ordenador, una Escala de las Actitudes hacia la Informática en Educación y una Escala sobre el Uso del Ordenador en Aula. Los resultados sugieren que la mayoría de los maestros utilizan las TIC en sus tareas personales y profesionales diarias, así como herramientas de la Web 2.0, siendo la más frecuente la de YouTube y los Blogs de los maestros de Educación Primaria y los programas educativos para los maestros de Educación Especial. Estudios inferenciales nos permiten verificar las diferencias en las actitudes y autoeficacia en función de variables personales y profesionales. Se analizaron los resultados obtenidos y las implicaciones para la formación docente y se presentaron sugerencias para estudios posteriores.

  14. Los entornos personales de aprendizaje

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    Julio Cabero Almenara

    2013-01-01

    Full Text Available En los últimos tiempos las TIC han cambiado de una forma exponencial los escenarios de formación; de manera que ese viejo dicho que decía que si un profesor del siglo XIX llegara a una de nuestras aulas actuales, podría desenvolverse con facilidad, al contrario de lo que podría ocurrir con un cirujano cuando entrara en un quirófano. Nuestros escenarios actuales de formación, tanto analógicos como los virtuales, son progresivamente más diferentes, y evolucionan en un corto período de tiempo, de forma que lo que hasta hace relativamente poco tiempo parecía como una tecnología que de verdad impactaría al sistema educativo en breve tiempo deja de estar presente, desaparece y sustituida por otra, que muchas veces no llega a durar mucho tiempo respecto a la que ha sustituido.

  15. Influencia de las actividades lúdicas grupales en la calidad de la lectura y en las relaciones personales de los alumnos de educación primaria

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    Teresita Reyes León

    2014-09-01

    Full Text Available La lectura es un proceso donde el lector construye el significado utilizando los conocimientos previos del tema, las pistas que éste le ofrece, las estrategias y operaciones mentales que se ponen en marcha al leer, tornándose una actividad placentera si se realiza a través del juego. Así, en base a las ideas de Piaget (1986, Kohlberg y Turiel (1981, Martí (1975, Montenegro y Guajardo (1994, se expone acerca del juego, la lectura y la comunicación interpersonal en los alumnos/as de Educación Primaria. En esta investigación de tipo pre-experimental, se aplicó una prueba previa al tratamiento, luego se administró este, finalizando con una prueba posterior, la cual tuvo por objeto establecer la viabilidad de las actividades lúdicas grupales para mejorar la calidad de la lectura y las relaciones personales en una muestra de veinte (20 alumnos de 4 grado de la Escuela Nacional Bolivariana (E.N.B. Antonio María Martínez del Municipio Mariño del Estado Nueva Esparta, utilizándose como técnicas la entrevista, la observación y una prueba de lectura oral. La realización de este trabajo se justifica porque las actividades destinadas al aprendizaje de la lectura no resultan divertidas al no considerar el trabajo grupal, ni la colaboración y participación de los/las estudiantes, aspectos necesarios para el ser, el conocer y el convivir. La aplicación de un Plan de Atención contó con la participación de los niños en la selección de los temas y de las actividades lúdicas. Finalizado el mes, se evaluó a los alumnos, observándose mejores resultados, producto del empleo de los juegos computarizados, que son significativos para el desarrollo integral de los mismos.

  16. Cuarenta años de investigación sobre la plasticidad del músculo esquelético; conclusiones personales (artículo completo disponible en inglés)

    OpenAIRE

    Hans Hoppeler

    2013-01-01

    Este es un estudio personal altamente subjetivo sobre la investigación llevada a cabo durante los últimos 50 años que documenta los fenómenos y los mecanismos de la plasticidad del tejido muscular esquelético. Enfocaré el trabajo desde una perspectiva histórica y seguiré algunos de los hilos que han despertado mi curiosidad y han guiado mi investigación a lo largo de mi carrera investigadora. Este estudio no es ni exhaustivo ni equilibrado. Representa mis intereses personales y algunos descub...

  17. Factores académicos y personales asociados al rendimiento académico de los estudiantes del Programa de Administración de Empresas de la Universidad de Sucre

    OpenAIRE

    Tatiana Margarita Mercado Covo; Candelaria Gloria Niño Sotomayor

    2012-01-01

    El rendimiento académico es un indicador que permite conocer los resultados del desempeño y aprendizaje en los estudiantes de una institución universitaria; así pues, el objetivo de esta investigación demostró la relación entre los factores personales y académicos con el rendimiento académico de los estudiantes en la Universidad de Sucre. Las variables estudiadas se fundamentaron en los trabajos de Garbanzo, (2007), Montero y Villalobos, (2001), Beguet, Cortada, Castro, y Renault, (2001), Tal...

  18. El efecto de las características personales de la fuerza de ventas sobre el diseño del plan de motivación óptimo

    OpenAIRE

    Azorín Escolano, Alfredo; Sellers Rubio, Ricardo

    1999-01-01

    El objetivo del presente estudio consiste en analizar la relación existente entre las características personales de la fuerza de ventas y la preferencia por diferentes tipos de recompensas. La aplicación empírica realizada a una muestra de 175 agentes de ventas industriales de diferentes empresas valencianas, permite demostrar que la edad y la experiencia profesional del vendedor constituyen los factores básicos que determinan la preferencia por distintos tipos de recompensas. La existencia d...

  19. Usos y sentidos otorgados por los actores sociales a sus fotografías personales. Abordajes metodológicos entre la antropología y la historia

    Directory of Open Access Journals (Sweden)

    Ana D’Angelo

    2013-01-01

    Full Text Available En este trabajo realizamos un balance metodológico entre aportes de la antropología y de la historia sobre el uso de fotografías personales en la investigación social. Está basado en nuestras investigaciones y expone una aproximación metodológica que recupera el lugar de los actores sociales en la interpretación de las imágenes. Una de ellas fue llevada a cabo en el contexto de un taller de fotografía al que asistían jóvenes de un barrio de pocos recursos del conurbano sur de la ciudad de Buenos Aires, Argentina, en el año 2005. La otra investigación está sustentada en colecciones personales-familiares de fotografías de mediados de siglo XX en Argentina. La aproximación que continuamos se propone conjugar pendularmente la doble cualidad de la imagen fotográfica como representación y presentación, los contextos de creación, uso y preservación y las interpretaciones de sus creadores/poseedores.

  20. Vivências pessoais e familiares de homossexuais femininas Vivencias personales y familiares de homosexuales femeninas Lesbians' personal and family experiences

    Directory of Open Access Journals (Sweden)

    Yáskara Arrial Palma

    2008-12-01

    Full Text Available O presente trabalho, teve como objetivo descrever as vivências pessoais e familiares de homossexuais femininas. Foram entrevistadas seis mulheres, residentes em Caxias do Sul e região, de 22 a 33 anos, cujos familiares conheciam sua orientação sexual. Todas eram solteiras e de nível socioeconômico médio, e exerciam alguma atividade profissional. Uma análise de conteúdo qualitativa das entrevistas gerou diversas categorias e subcategorias temáticas. Em geral, a homossexualidade foi considerada normal/natural, uma situação que trouxe felicidade para as participantes, apesar dos preconceitos enfrentados. Na percepção delas, a reação dos familiares quando da descoberta da sua orientação sexual foi negativa, tendo melhorado ao longo do tempo em alguns casos. Tais achados revelaram uma mudança social na forma de pensar e agir diante da homossexualidade feminina, porém ainda lenta e gradual. Ficou evidenciada a necessidade de atuação da psicologia através de programas de atendimento às famílias e às homossexuais.Ese trabajo objetivó describir las vivencias personales y familiares de homosexuales femeninas. Seis mujeres (22 a 33 años, de Caxias del Sur y región, cuyos familiares conocían su orientación sexual, fueron entrevistadas. Todas eran solteras, de nivel socio-económico medio y ejercían alguna actividad profesional. Análisis de contenido cualitativa de las entrevistas generó diversas categorías y subcategorías temáticas. En general, la homosexualidad fue considerada normal/natural, una condición que trajo felicidad, a pesar de los prejuicios enfrentados. Las participantes consideraron negativa la reacción de los familiares frente a la descubierta de su orientación sexual, lo que ha mejorado a lo largo del tiempo en algunos casos. Tales resultados revelaron un cambio social en la manera de pensar y actuar delante de la homosexualidad femenina, sin embargo aún lenta y gradual. Se quedó evidenciada la

  1. Liver trauma from penetrating injuries. Miscellanea, personal series, clinical and CT findings; Traumi epatici da lesioni penetranti. Miscellanea, casistica personale, aspetti clinici e con Tomografia Computerizzata

    Energy Technology Data Exchange (ETDEWEB)

    Salzano, A.; Nocera, V. [Ospedale San Giovanni di Dio di Frattamaggiore, Servizio di Radiologia, Frattamaggiore, NA (Italy); De Rosa, A.; Vigliotti, A. [Azienda Sanitaria Locale NA1, Radiologia, Naples (Italy); Rossi, E.; Carbone, M.; Gatta, G. [Naples Univ. Federico 2., Naples (Italy). Ist. di Scienze Radiologiche; Vitale, L. [Ospedale di Sorrento, Servizio di Radiologia, Sorrento, NA (Italy)

    2000-12-01

    the extent and severity of damage, which permits to choose a conservative treatment in case of intraparenchymal hematomas and lacerocontusive foci without hemoperitoneum, which can be followed-up with physical and CT examinations. Moreover, Helical CT could provide the early diagnosis of active bleeding in the peritoneum and of focal bleeding in the liver, thus permitting prompt hepatorrraphy or targeted hepatectomy. A diaphragm injury suspected at CT should always prompt the surgeon to intervention, especially when hemothorax, lung base pneumothorax, large liver hematoma or tear of the liver dome are associated. Finally, subdiaphragmatic free gas indicates gut perforation associated with liver damage, in which case surgery is necessary too. [Italian] Le ferite penetranti del fegato sono dovute a molteplici cause, e occupano il secondo posto dopo i traumi chiusi epato-addominali. Scopo del lavoro e' di illustrare i vari quadri clinico-radiologici della nostra casistica personale, determinati da lesioni penetranti da armi da fuoco e da punta e taglio. Definire inoltre la modalita' di diagnosi, soprattutto in base ai segni TC del danno epatico e di lesioni associate, che condizionano in modo decisivo la terapia e l'approccio chirurgico o conservativo. Negli ultimi sette anni sono stati studiati retrospettivamente 31 casi (19 maschi e 12 femmine; eta' media 42 anni, compresa tra 18 e 73 anni), con lesioni penetranti del fegato, dovute prevalentemente a armi da fuoco (16 pazienti), a armi da punta e taglio (9 casi) e miscellanee in 6. L'esame TC dell'addome e' stato eseguito in emergenza e con tecnica angio-TC in tutti i pazienti. Nei casi di ferite con sospetto coinvolgimento toraco-addominale, la TC veniva iniziata dal medio-torace al fine di una valutazione accurata del diaframma, delle basi polmonari e per escludere lesioni pleuropolmonari associate. Nel 70% dei casi le ferite penetranti epatiche erano in relazione ad arma da fuoco

  2. Los objetos personales en el universo poético de Joaquín Giannuzzi. La revelación de lo incierto en el seno de la intimidad

    OpenAIRE

    Mercedes Lennon

    2015-01-01

    La propuesta de lectura  se fundamenta en  el concepto de “mundo del texto” que plantea Ricoeur , es decir, aquello “ acerca de lo que se habla” en la poesía de Joaquín Giannuzzi.  En esta línea de reflexión, el concepto de revelación como acontecimiento en sus poemas va  a manifestar esta búsqueda de sentido que en nuestro poeta siempre dialoga con lo incierto y oscuro.  En el imaginario giannuzziano , el  universo íntimo de los objetos personales escenifica la pregunta por el otro, ajeno, y...

  3. Estudio sobre la Implantación de las Políticas de BYOD para el Uso de Dispositivos Móviles Personales en las Comunicaciones de Empresa

    OpenAIRE

    NICOLÁS MELERO, MARÍA OLVIDO

    2014-01-01

    La "consumerización" de las TIC ha dado lugar al fenómeno del BYOD (¿Bring Your Own Device¿). El proyecto muestra que es una tendencia estratégica en tecnología, ofrece una visión global de las implicaciones del BYOD y ofrece recomendaciones para la implantación de un proyecto BYOD en una organización. Nicolás Melero, MO. (2014). Estudio sobre la Implantación de las Políticas de BYOD para el Uso de Dispositivos Móviles Personales en las Comunicaciones de Empresa. http://hdl.handle.net/1025...

  4. El uso de las TIC y herramientas de la Web 2.0 por maestros portugueses de la educación primaria y educación especial: la importancia de las competencias personales

    OpenAIRE

    Carla García; Paulo Días; Antonio Sorte; Julian Díaz Pérez; Ana Rita Leal; Mario Gandra

    2014-01-01

    Este estudio tiene como objetivo analizar el papel de las habilidades personales como las actitudes y autoeficacia en relación con el uso de las Tecnologías de la Información y la Comunicación (TIC) y las herramientas Web 2.0 entre los maestros de la Enseñanza Regular y Educación Especial. Se utilizó una metodología cuantitativa en una muestra de 200 maestros de Primaria y Educación Especial. Se administró un cuestionario sobre el uso de las TIC y las herramientas de la Web 2.0, una Escala de...

  5. Redes personales y capital social en una parroquia rural de la Provincia de Maracaibo (Venezuela a fines del siglo XVIII: La Inmaculada Concepción de La Cañada (1784-1804

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    Luis Rincón Rubio

    2015-07-01

    Full Text Available En los estudios históricos, la expresión “red social” es utilizada principalmente como un concepto metafórico que implica la interconexión de diferentes individuos. Si bien este enfoque permite abordar aspectos funcionales de las redes sociales, no permite analizarlas sistemáticamente desde un punto de vista estructural. Superando el uso metafórico del concepto de red social, se adopta en esta investigación la metodología del Análisis de Redes Sociales (ARS para estudiar las redes personales tejidas durante las dos últimas décadas del siglo XVIII por los agentes sociales detentores de mayor capital social en la parroquia eclesiástica Inmaculada Concepción de La Cañada, provincia de Maracaibo de la antigua Capitanía General de Venezuela, mediante vínculos de parentesco consanguíneo y vínculos derivados de las instituciones eclesiásticas del matrimonio y el bautismo. La utilización de la metodología del ARS permitió ilustrar un enfoque todavía muy poco utilizado en la investigación histórica, y profundizar en aspectos de interés relativos a la creación de vínculos personales, la distribución del capital social y las estrategias de reproducción social puestas en práctica por los habitantes de una comunidad rural de la América Hispana.

  6. Measurement of dose equivalent with personal dosemeters and instrumentation of radiological protection in the new operative ICRU magnitudes, for external fields of beta radiation. Part III. Determination of the joint of factors of angular conversion for the secondary source pattern Nr. - 86 Of (1850) MBq; Medicion de dosis equivalente con dosimetros personales e instrumentacion de proteccion radiologica en las nuevas magnitudes operativas ICRU, para campos de radiacion Beta externos. Parte III. Determinacion del conjunto de factores de conversion angular para la fuente patron secundario Nr.- 86 de (1850) MBq

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez R, J.T. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    1994-02-15

    It determined the assembly of factors of angular conversion T(0;{alpha}), for the source secondary pattern of {sup 90}Sr/{sup 90}Y (1850 MBq) at a distance detecting source of 30 cm, in the following angles: 0, 15, 30, 45, 60 and 75{sup 0}. Obtaining the values of: 1.01, 1.05, 1.13, 1.19 and 0.95, respectively. Their Global uncertainty is smaller to 1.5% for all the cases and its percentage differences with regard to the values reported by the Draft of the norm ISO 6980(1992) they are smaller to 3.0% for all the cases.The technique employee was that of the extrapolation Chamber and the treatment of the uncertainties is made of agreement with the recommendations of the BIPM. (Author)

  7. COMPARACIÓN ENTRE LOS MÍNIMOS PERSONALES INCREMENTADOS Y EL IMPUESTO SOBRE LA RENTA TRADICIONAL DE LAS PERSONAS FÍSICAS. El caso de España

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    Laura Varela Candamio

    2014-01-01

    Full Text Available Este artículo define y evalúa un nuevo método fiscal basado en la combinación de un esquema de tipo único imponible y mínimos personales incrementados sobre la base imponible, al que denominaremos el Método Fiscal basado en Renta Discrecional (MFRD, a comparación del tradicional impuesto sobre la renta de las personas físicas basado en una tarifa impositiva progresiva. Los resultados muestran, desde una perspectiva teórica, que nuestra propuesta es más progresiva y superior en términos de bienestar social. Para la comprobación empírica de nuestros resultados, hemos llevado a cabo un ejercicio en donde se compara el IRPF (Impuesto sobre la Renta de las Personas Físicas español con nuestro método fiscal teórico alternativo (MFRD. Los resultados de nuestro ejercicio empírico coinciden con las predicciones teóricas de la “imposición objetiva” aquí descrita y derivada de la comparación de los dos métodos fiscales.

  8. Nuevas vías para aprender y enseñar la construcción textual en Tecnólogos de la Comunicación a través de entornos personales de aprendizaje (PLE.

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    Martha María Fernández Rodríguez

    2015-11-01

    Full Text Available Se presenta una experiencia pedagógica en el orden didáctico para la construcción textual en la formación de profesionales Tecnólogos de la Comunicación, a través de entornos personales de aprendizaje (PLE. Responde al objetivo de socializar los resultados alcanzados en esta dirección en el Instituto Tecnológico Superior Urdesa - ITSU en Guayaquil-Ecuador. Se muestra la experiencia a través de 3 fases con sus respectivas acciones. Los resultados alcanzados permitieron el desarrollo del proceso de enseñanza-aprendizaje (PEA para la construcción de textos de asignaturas relacionadas con la Comunicación Publicitaria mediante el desarrollo de MOOCs que en combinación con técnicas didácticas, constituyen una forma diferente de enseñar y aprender. Se demostró la necesidad de cambios a la hora de ejecutar el PEA en profesores y estudiantes, a partir del aprendizaje colaborativo en red. La experiencia forma parte de una investigación con la que se optará al grado Científico de Doctor en Ciencias Pedagógicas.

  9. ¿Qué esperan encontrar los alumnos en los estudios de Psicología?: metas y motivos personales de los estudiantes en su primer año en la universidad

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    Elena Gámez

    2015-05-01

    Full Text Available Numerosas investigaciones se han interesado por el perfil motivacional de ingreso de los universitarios. Sin embargo, se ha prestado menos atención al estudio de las metas que los estudiantes pretenden satisfacer cuando llegan a la universidad. En este trabajo presentamos un primer estudio con 610 alumnos de Psicología, de cuatro cursos consecutivos. En él se analiza la estructura factorial de una escala que evalúa la identificación de los estudiantes con diferentes tipos de motivos. En un segundo estudio, con otros 140 estudiantes, se relacionan las metas interpersonales con otras metas vitales, la satisfacción de necesidades psicológicas, el bienestar subjetivo y la presencia de pensamientos perfeccionistas. Los datos muestran la importancia de las metas de logro, de poder, de afiliación y de superación de problemas personales. Estas últimas presentan, además, una relación negativa con el bienestar y la satisfacción de necesidades psicológicas, y una relación positiva con el perfeccionismo. Nuestros resultados aportan un mayor conocimiento de los perfiles de los estudiantes de nuevo ingreso y las consecuencias que de ellos se derivan para su orientación académica.

  10. Los objetos personales en el universo poético de Joaquín Giannuzzi. La revelación de lo incierto en el seno de la intimidad

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    Mercedes Lennon

    2015-04-01

    Full Text Available La propuesta de lectura  se fundamenta en  el concepto de “mundo del texto” que plantea Ricoeur , es decir, aquello “ acerca de lo que se habla” en la poesía de Joaquín Giannuzzi.  En esta línea de reflexión, el concepto de revelación como acontecimiento en sus poemas va  a manifestar esta búsqueda de sentido que en nuestro poeta siempre dialoga con lo incierto y oscuro.  En el imaginario giannuzziano , el  universo íntimo de los objetos personales escenifica la pregunta por el otro, ajeno, y lo otro incierto, vacío, siniestro, sagrado. La revelación acontece en una habitación , sobre la mesa y entre los objetos amados pero desata una crisis en el seno del mundo habitado. El sujeto giannuzziano va a adquirir la figura del teólogo fracasado o del Job humillado que intenta vanamente alcanzar alguna respuesta que le permita recuperar lo habitable en un mundo dislocado. La elección del marco teórico corresponde a la hermenéutica de Paul Ricoeur , fundamentalmente a los libros Fe y filosofía (1990  y  a  La metáfora viva (1980 como también se apoya en la fenomenología, en particular, Fenomenología de la percepción de Merleau -Ponty (1975. En cuanto a los presupuestos metodológicos, abordaré la lectura de los poemas con el aporte de la simbólica tradicional, la semántica estructural y la semiótica greimasiana.

  11. Las Narraciones de Experiencias Personales en la Escuela Infantil: ¿Cómo Apoyan las Maestras la Participación de los Niños? Children Telling Personal Experiences in Kindergarten: How do Teachers Promote Children's Participation?

    Directory of Open Access Journals (Sweden)

    Celia Renata Rosemberg

    2007-05-01

    Full Text Available El trabajo se propone analizar cualitativamente situaciones de relato de experiencias personales en el evento de la ronda en la escuela infantil, atendiendo en particular a las estrategias que las maestras emplean para colaborar con los niños en la reconstrucción de su experiencia a través de una narración bien estructurada. Empleando el método comparativo constante (Glasser & Strauss, 1967 para analizar 98 situaciones videofilmadas, se identificaron y caracterizaron los mecanismos discursivos subyacentes tanto a las situaciones en las que las maestras se apoyan en las pistas proporcionadas por los niños para interpretar su intención comunicativa, como a aquellos en que las maestras se alejan de la intención comunicativa de los niños y centran el intercambio en aspectos periféricos del discurso infantil.The aim of this study is to qualitatively analize situations in which children tell personal experiences in the circle at kindergarten. We focus on how teachers scaffold children as they tell personal experiences through a good structured narrative. We analysed 98 situations of collaborative retelling using the constant comparative method (Glasser y Strauss, 1967. In some cases teachers interpret the child's intention through certain cues in the child's discourse and assist the child as he/she verbally reconstructs his/her experience. In other situations teachers diverge from the child's intention and focus verbal interaction in topics which are periferic to the child discourse.

  12. Cuarenta años de investigación sobre la plasticidad del músculo esquelético; conclusiones personales (artículo completo disponible en inglés

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    Hans Hoppeler

    2013-06-01

    Full Text Available Este es un estudio personal altamente subjetivo sobre la investigación llevada a cabo durante los últimos 50 años que documenta los fenómenos y los mecanismos de la plasticidad del tejido muscular esquelético. Enfocaré el trabajo desde una perspectiva histórica y seguiré algunos de los hilos que han despertado mi curiosidad y han guiado mi investigación a lo largo de mi carrera investigadora. Este estudio no es ni exhaustivo ni equilibrado. Representa mis intereses personales y algunos descubrimientos cruciales que han marcado mis objetivos de investigación. He tenido la suerte de llevar a cabo este estudio con colaboradores muy creativos que han sido los que han realizado la mayor parte de esta investigación. También he tenido la suerte de contar con dos tutores excepcionales, ER Weibel y C.R. Taylor, que me han apoyado durante todo el proceso guiándome y dándome consejos e, inicialmente, facilitándome la ayuda económica necesaria. Han fomentado un enfoque global y me han enseñado a combinar la investigación funcional y estructural para lograr una visión integral del rendimiento del sistema. Cuando las herramientas moleculares apropiadas pasaron a estar disponibles a finales de los 90, estas ayudaron a descubrir los mecanismos subyacentes de la plasticidad estructural y funcional del músculo previamente descrita. La idea de que el tejido muscular esquelético activo es determinante para el bienestar físico y para la salud continuará impulsando la investigación mecanicista de la plasticidad muscular en el futuro.

  13. La segregación ocupacional por sexo a examen. Características personales, de los puestos y de las empresas asociadas a las ocupaciones masculinas y femeninas

    Directory of Open Access Journals (Sweden)

    Marta Ibañez Pascual

    2008-01-01

    Full Text Available La segregación laboral de los sexos es hoy una frontera invisible que estructura el sistema productivo (el 61% de los/as trabajadores/as se encuentran en ocupaciones mayoritariamente masculinas o mayoritariamente femeninas. Se analizan las características de los trabajos segregados, con el fin último de comprobar hasta qué punto esta separación conlleva o no diferentes oportunidades y/o recompensas laborales. Para dicho análisis, se describe y cuantifica primero el propio fenómeno de la segregación con el Censo de Habitantes del año 2001 (se evita así el error muestral, peligroso cuando se trabaja con ocupaciones desagregadas, del CNO-94 a tres dígitos y, a través de regresiones logísticas nominales y con la Encuesta de Población Activa (EPA y la Encuesta de Estructuras Salariales (EES, se estudian las características personales, de los puestos de trabajo y de las empresas asociadas a las ocupaciones segregadas. Los resultados señalan tanto la importancia cuantitativa del fenómeno como su íntima relación con los estereotipos de género. Además, aparecen características de las ocupaciones femeninas que ponen en duda la teoría del capital humano y matizan algunas suposiciones de la teoría de los mercados segmentados.

  14. DREPTUL COPILULUI LA LEGĂTURI PERSONALE

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    Gabriela Lupsan

    2007-05-01

    Full Text Available Convenţia Organizaţiei Naţiunilor Unite privind drepturile copilului adoptată la data de 20noiembrie 1989. Textul care a revoluţionat viziunea juridică asupra statutului copilului, prin prismaprerogativelor fundamentale care aparţin oricărui copil, în calitatea sa de mic om, l-a reprezentatConvenţia internaţională asupra drepturilor copilului1, adoptată în unanimitate de OrganizaţiaNaţiunilor Unite la data de 20 octombrie 1989 şi ratificată apoi de toate statele membre ale ONU, cuexcepţia S.U.A şi Somaliei. Această convenţie recunoaşte copilului un ansamblu de drepturifundamentale, printre care enunerăm dreptul la viaţă al fiecărui copil (art. 6.1, dreptul de a-şicunoaşte, în măsura posibilului, părinţii şi de a fi îngrijit de aceştia (art. 7, dreptul copilului de a nu fiseparat de părinţi împotriva voinţei lor (art. 9, dreptul de a-şi exprima liber opinia asupra oricăreiprobleme care îl priveşte şi de a fi ascultat în orice procedură judiciară sau administrativă care îlpriveşte (art. 12.2, dreptul la libertatea de expresie (art. 13, dreptul la libertatea de gândire, deconştiinţă şi religie (art. 14, dreptul la respectarea vieţii private (art. 16, dreptul copilului de a sebucura de cea mai bună stare de sănătate şi de a beneficia de servicii medicale şi de recuperare (art.24, dreptul la educaţie (art. 28 etc.

  15. Autoinmunidad tiroidea: Recuerdos personales (1957-1959

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    Efraim Otero Ruiz

    2011-07-01

    Full Text Available

    He creído importante transcribir estas reminiscencias, pues hacen parte del sudor y esfuerzo que muchos colombianos hemos brindado para contribuir con nuestro grano de arena a investigaciones que, en la segunda mitad del siglo XX, transformaron y dieron nueva luz al pensamiento inmunológico.

    Puede decirse que en la segunda mitad de la década de los años 5Os se vivió una de las épocas más excitantes en el Departamento de Medicina del Columbia- Presbyterian Medical Center (Presbyterian Hospital o PH en la calle 168 de la ciudad de Nueva York. El Director (Chairman del Departamento era el Profesor Robert F. Loeb, uno de los internistas más prestigiosos del mundo, coautor del texto de Medicina Interna de Cecil Loeb, la biblia médica para los no iniciados. Alrededor de él se congregaba -como podía observarse los martes en las Clínicas Endocrinas Combinadas, celebradas en el enorme torreón o anfiteatro que databa de comienzos del siglo- la élite del conocimiento médico y científico, personas que sacaban tiempo de sus investigaciones para dictar las diversas cátedras: Severo Ochoa -el Premio Nobel español, tan adusto como su nombre- en genética, -proveniente del New York Hospital que compartía con Presbyterian y con Bellevue el triunvirato de la medicina interna y las clínicas combinadas-; Sydney Werner y Ken Sterling (tiroides, Dana Atchley (electrolitos, cetoacidosis diabética y Seymour Lieberman (suprarrenales en endocrinología; Franklin Hanger en Hepatología; Beatrice Seegal en inmunología y transplantes; y, por supuesto, como profesores visitantes, Salomón Berson y Rosalyn Yalow (diabetes procedentes del Hospital de Veteranos del Bronx, sin contar con los innumerables profesores asistentes o visitantes, más jóvenes, que después brillarían con luz propia. Se asistía no sólo a la primera infancia de la nueva genética (nacida con la doble hélice de Watson y Crick en 1953 sino del atrevido concepto de la enfermedad autoinmune. Ambos conceptos venían rompiendo dogmas establecidos por casi más de un siglo y que había definido Ehrlich, el padre de la inmunología humoral, con el término latino de horror autotoxicus.

    Efectivamente, desde 1951, J. MacFarlane Burnet y Peter Brian Medawar habían lanzado el concepto de la tolerancia inmunológica; las brillantes disquisiciones teóricas de Burnet sobre selección clonal de linfocitos habían sido seguidas de los elegantes experimentos de Medawar y Billingham, primero con trasplantes de piel y luego de otros órganos. A partir de 1955 ambos habían sido invitados a dar conferencias en el Columbia-Presbyterian sobre los primeros esbozos de la enfermedad autoinmune y la tolerancia inmunológica, conceptos que les valdrían el Premio Nobel de 1960.

  16. El Impuesto a las Ganancias en la 4° Categoría: Análisis de las deducciones personales en un contexto infl acionario para trabajadores/as en relación de dependencia

    Directory of Open Access Journals (Sweden)

    Miriam Geli

    2016-07-01

    Full Text Available El contexto inflacionario actual afecta la determinación del Impuesto a las Ganancias en su aplicación a los/as trabajadores/as en relación de dependencia de Argentina. La falta de actualización periódica de sus componentes distorsiona la carga fiscal y genera el pago de impuesto sobre ingresos que son parte de los gastos de “subsistencia”. Se analiza si la aplicación de la actual normativa cumple con los principios de capacidad contributiva, equidad y progresividad. A efectos de hallar un parámetro de ingresos altos se trabaja por analogía con el concepto de pobreza utilizando la canasta básica total como unidad de medida para los casos propuestos. Se concluye que una modificación de la escala para los tramos de ingreso inferiores, de los mínimos no imponibles y de las deducciones personales evitaría hacer recaer el peso de las políticas distributivas en los salarios de los contribuyentes con ingresos medios.Palabras claves: Impuesto a las ganancias, Inflación, deducciones, trabajo en relación de dependencia.Código JEL: E62.Income tax in the 4th category. Analysis on the personal deductions in an inflationary context for employeesAbstractThe current inflationary context affects Income Tax setting as applied to employees in Argentina. The lack of a regular updating of its components distorts the tax burden and generates the payment of a tax on income which is part of “subsistence” expenses. We analyze whether the application of current legislation complies with the principles of tax-paying capacity, equity and progressivity. In order to find a high-income parameter, we draw an analogy with the concept of poverty using the total basket of goods and services as unit of measurement for the cases proposed. We conclude that a modification in the scale for lower income segments, in non-taxable minimums and in personal deductions would avoid the burden of distributive policies falling on middle-income taxpayers’ wages

  17. Judíos y redes personales en Tierra de Campos durante la segunda mitad del siglo XV: un Cuaderno de Minutas de Avecindamientos de Villalón

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    Castaño, Javier

    2009-12-01

    Full Text Available In the middle decades of the fifteenth century Jews were registered as local citizens in the municipal council records of individual Castilian towns. Traditionally, a citizen was recorded as belonging to a parish or parochial neighborhood within the local political community; this would exclude Jews by definition as they were designated separately as a religious caste. The study of unpublished documents related to the Castilian locale of Villalón –characterized by the economic importance of its fairs promoted by the 4th count of Benavente– in the region of Tierra de Campos during a period of general political disorder, records that the municipal council assigned citizenship to Jews in relation to their community (aljama through which specific aspects of their lives were regulated, and by which the local council rather than other political instances assumed control of that community. With the help of other primary sources, these documents reveal the suggestion of personal networks in which Jewish physicians play a key role.

    En las décadas centrales del siglo XV algunos judíos fueron inscritos por las autoridades concejiles como vecinos en distintas localidades castellanas. Tradicionalmente, la vecindad se había caracterizado como una categoría de pertenencia a una comunidad política local, cuya participación estaría vetada a los judíos al considerarlos como una casta religiosa. Partiendo del estudio de documentación inédita relativa a la localidad castellana de Villalón –en un momento de auge de sus ferias impulsadas por el IV conde de Benavente– en Tierra de Campos, durante los años de desorden político general del reino, se propone una interpretación del avecindamiento de judíos que privilegia las relaciones de subordinación de la aljama respecto del concejo. Con ayuda de otras fuentes documentales, se ofrece un esbozo de las redes personales de judíos, subrayando el protagonismo de los médicos.

  18. El malestar por inestabilidad laboral y su relación con tensión y recursos personales Uneasiness due to Job instability and its relationship With psychological strain and personnal resources

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    N. Leibovich de Figueroa

    2007-12-01

    Full Text Available La inestabilidad laboral se ha tornado uno de los estresores psicosociales más relevantes en las últimas décadas y su percepción podría generar malestar y sufrimiento, desembocando en un estado de estrés con la consecuente elevación de tensión en uno o varios de sus canales de expresión, provocando así efectos deletéreos en la salud psico-física de los trabajadores. Nos preguntamos qué aspectos personales y laborales de los trabajadores estarían vinculados a un mayor malestar debido a la inestabilidad laboral y si éste es predictor de la tensión psicológica que manifiesta el trabajador. El IMPIL, en su versión reducida, junto con otras técnicas, fue administrado a una muestra de 90 empleados en relación de dependencia. Concluimos que la inestabilidad laboral impacta negativamente en el trabajador a través de uno de los canales de expresión: el malestar, sobre todo si existe un desajuste entre el nivel de instrucción y la tarea que realiza. A su vez, corroboramos que la inestabilidad laboral y el malestar que la misma genera producen altos niveles de tensión psicológica en el trabajador.In the last decades job instability has become one of the most important psychosocial stressors and its perception could generate uneasiness and suffering, leading to a stressful state with a consequent increase of strain through one or several of its channels of expression, producing deleterious effects in the psychophysical health of workers. We wonder which workers' personal and job features could be related to a greater uneasiness due to job instability and if this job instability is a predictor of the psychological strain expressed by them. The IMPIL, in its reduced version, and other techniques were administered to a sample of 90 salaried employees. We conclude that job instability has a negative impact on the worker through one of the channels of expression: uneasiness, most of all if there exists a maladjustement between the

  19. Early termination of breast-feeding in periurban Santo Domingo, Dominican Republic: mothers' community perceptions and personal practices Interrupción precoz de la lactancia materna en la zona periurbana de Santo Domingo, República Dominicana: las prácticas personales de la madre y su percepción de las prácticas de la comunidad

    Directory of Open Access Journals (Sweden)

    John D. McLennan

    2001-06-01

    Full Text Available Objectives. The objectives of this study were to determine: 1 whether mothers' perceptions of typical community practice for breast-feeding duration influence their personal practices and 2 whether the mothers' reports of community reasons for terminating breast-feeding identify barriers not elicited through self-report. Methods. The study was conducted in 1997 in a sample of poor neighborhoods in a periurban district of Santo Domingo, the capital of the Dominican Republic. A representative sample of 220 mothers from these neighborhoods was interviewed with a structured questionnaire. Results. While the duration of breast-feeding was similar for self-report and for mothers' perceptions of typical community practice, there was no statistically significant correlation between these two variables. "Mother-driven" reasons for early termination of breast-feeding, such as "fear of loss of figure or of breast shape" and "not wanting to breast-feed," were frequently perceived as community reasons but rarely given as personal reasons. Personal reasons were predominately "child-driven," including "the child not wanting the breast," or reasons beyond the mother's control such as having "insufficient" milk. Conclusions. Maternal report of community reasons for early termination may be a useful way to identify factors that would not otherwise be revealed on self-report. These additional reasons may guide health promotion efforts aimed at increasing breast-feeding duration.Objetivos. Los objetivos de este estudio consistieron en determinar: 1 si las percepciones de las madres acerca de las prácticas de lactancia materna típicas de su comunidad influyen sobre sus prácticas personales, y 2 si las respuestas de las madres sobre los motivos que llevan a interrumpir la lactancia materna en su comunidad identifican problemas no reflejados en las respuestas sobre sus propias prácticas. Métodos. El estudio se realizó en 1997 en una muestra de barrios pobres de

  20. Desgaste profesional en el personal sanitario y su relación con los factores personales y ambientales Burnout syndrome in health workers and relationship with personal and environmental factors

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    Armand Grau

    2005-12-01

    Full Text Available Objetivos: Entre los profesionales sanitarios se han hallado altos índices de desgaste profesional. Nuestro objetivo fue estudiar la prevalencia del síndrome de desgaste profesional en los trabajadores sanitarios hospitalarios, y valorar su relación con los factores personales y ambientales. Métodos: Un total de 2.290 trabajadores sanitarios de 5 hospitales de Girona fueron invitados a participar. Se les administró un cuestionario de elaboración propia, una encuesta del clima organizacional, y el Maslach Burnout Inventory, que incluye tres dimensiones: cansancio emocional, despersonalización y baja realización personal. Resultados: Contestaron la encuesta 1.095 trabajadores (con un 47,8% de participación. Un 41,6% presentó un alto nivel de cansancio emocional, sobre todo los médicos y el personal de enfermería; un 23% tuvo un alto nivel de despersonalización, sobre todo los médicos, y un 27,9% tuvo una baja realización personal, en especial los técnicos y los médicos. Mediante un análisis de regresión logística múltiple, se asoció un alto nivel de cansancio emocional al consumo de tranquilizantes o antidepresivos con asiduidad, mientras que el optimismo y la satisfacción profesional mostraron una asociación inversa. Los años de profesión, el optimismo, valorar como útil el trabajo y percibir que se es valorado por los demás se asociaron inversamente con un alto nivel de despersonalización. La baja realización personal se asoció inversamente con el optimismo, la valoración de la utilidad del trabajo y el equipo de trabajo. Conclusiones: A partir de los resultados obtenidos, recomendamos mejorar el clima organizacional y potenciar el optimismo y la autoestima individual, para disminuir el desgaste profesional en los hospitales.Objectives: High rates of professional burnout syndrome have been found among health service professionals. Our objective was to study the prevalence of burnout syndrome in hospital health

  1. Interstitial laser photocoagulation in the treatment of liver tumors. Personal technique, short term results and complications in patients with normal and impaired liver function; Fotocoagulazione laser-interstiziale ecoguidata dei tumori maligni del fegato: tecnica personale, risultati immediati e complicanze a breve termine nei pazienti con funzionalita' epatica normale e alterata

    Energy Technology Data Exchange (ETDEWEB)

    Giorgio, A.; Tarantino, L.; De Stefano, G.; Farella, N. [Azienda Ospedaliera D. Cotugno, Naples (Italy). Servizio di Ecografia ed Ecointerventistica; Catalano, O.; Cusati, B. [Ospedale S. Maria delle Grazie, Pozzuoli, NA (Italy). Servizio di Radiologia; Alalia, A. [Azienda Ospedaliera D. Cotugno, Naples (Italy). Servizio di Anestesia e Rianimazione; Del Vescovo, L. [Naples Univ. II, Naples (Italy). Ist. di Radiologia

    2000-04-01

    The work reports the personal experience with interstitial laser photocoagulation in patients with liver tumors (mostly cirrhotics with hepatocellular carcinoma). The aim was to evaluate the short term efficacy of percutaneous interstitial laser photocoagulation in inducing focal ablation of liver tumors and the possible complications in patients with normal and impaired liver function. [Italian] Il presente lavoro riporta l'esperienza personale con l'utilizzazione della fotocoagulazione laser-interstiziale per tumori maligni del fegato, rappresentati in gran parte da epatocarcinomi in cirrosi. Lo scopo e' quello di verificare l'efficacia terapeutica in termini di volume di necrosi e di valutare gli effetti collaterali e le complicanze a breve termine sulla riserva funzionale del fegato e di altri organi, soprattutto nei pazienti con alterata funzionalita' epatica.

  2. Valores Pessoais como Base para Segmentação Estratégica: um estudo com profissionais paulistasPersonal Values as Basis for Strategic Segmentation: a study with professionals from Sao PauloValores Personales como Base para la Segmentación Estratégica: un estudio con profesionales de Sao Paulo

    Directory of Open Access Journals (Sweden)

    GIRALDI, Janaina de Moura Engracia

    2010-09-01

    with the survey method of data collection in a sample of executives from Sao Paulo who are considered to be potential buyers of high value and innovative goods. An exploratory factor analysis was employed in order to reduce the values scale used and a cluster analysis was performed to identify the groups of executives according to the importance attached to different personal values. Concluding, it was observed that there was a similarity among the three personal values dimensions, named as Civility (concerns about having a good conduct before society according to social rules of interaction, Self-Direction (intellectual aspects and practical orientation in their conducts and Conformity (restriction of actions, inclinations and impulses, that are likely to harm others and would violate expectations and the ones reported in the theory Rokeach’s theory about instrumental personal values. Furthermore, three groups of executives were identified (good conduct group, low restriction group and high restriction group. The differences observed in the importance of personal values here presented by the dimensions called Civility, Self-Direction and Conformity can lead to different buying behaviors and product preferences. From the results found in this study, the companies could adapt their current and new products offers, as well as their communication, in order to better serve these segments of executives from Sao Paulo.RESUMENUna importante base de segmentación para las empresas, como también los valores personales de los consumidores, son los temas investigados en el presente artículo. Para realizar el referido estudio se utilizó una investigación descriptiva con método transversal simple de recolección de datos en campo en una muestra de ejecutivos de Sao Paulo, considerados como potenciales compradores de productos del alto valor agregado y de innovaciones. Se realizó un análisis factorial exploratorio para reducir la escala de valores utilizada y un an

  3. Measurement of dose equivalent with personal dosemeters and instrumentation of radiological protection in the new operative magnitudes ICRU, for external fields of radiation beta. Part IV. Survey of the angular response of instruments used in radiological protection in secondary patron fields of beta radiation ({sup 90}Sr/{sup 90}Y (1850 MBq and 74 MBq), {sup 204}TI (18.5 MBq) and {sup 147}Pm (518 MBq)); Medicion de dosis equivalente con dosimetros personales e instrumentacion de proteccion radiologica en las nuevas magnitudes operativas ICRU, para campos de radiacion beta externos. Parte IV. Estudio de la respuesta angular de instrumentos empleados en proteccion radiologica en campos patrones secundarios de radiacion beta ({sup 90}Sr/{sup 90}Y (1850 MBq y 74 MBq), {sup 204}TI (18.5 MBq) y {sup 147}Pm(518 MBq))

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez R, J.T. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    1994-02-15

    Tests type were made (type test) in the following commercial instrumentation commonly used in radiological protection: Geiger-Mueller Counters (FH40 FE), Plastic Scintillators (NE-BP/6/4A), Ionization Chambers (RO-5) and Proportional Counters (HP-100A; gas:P-10). With object of checking the possibility that these they can carry out the new operative unit ICRU, H' (0.07; {alpha}). The tests consisted on determining the energy and angular response of the detectors in secondary patron fields of beta radiation, for isotopes of {sup 90}Sr/{sup 90}Y (1850 MBq and 74 MBq and {sup 147}Pm(518 MBq). The results show the inadequate of these commercial instruments for the realization of the H' operative unit (0.07; {alpha}) in beta external fields. Due to flaws in the design, construction and calibration of the instruments for this type of radiation fields (Author)

  4. L’evolució del garantisme: de les garanties personals a la garantia de l’estat - The Evolution of Constitutional Guarantees: from personal guarantees to guaranteeing the State - La evolución del garantismo: de las garantías personales a la garantía del Estado

    Directory of Open Access Journals (Sweden)

    José Esteve Pardo

    2013-06-01

    Full Text Available La reforma constitucional per a l’estabilitat pressupostària i la contenció del dèficitLa reforma de l’article 135 de la Constitució és un moviment inèdit en el constitucionalisme, ja que per primera vegada s’orienta cap a la protecció del mateix Estat, a la sostenibilitat, davant l’exposició excessiva al crèdit extern. Les garanties constitucionals van ser primer garanties de llibertats personals, després garanties d’institucions de l’Estat o de la societat i ara, per primera vegada, garanties del mateix Estat. The Constitutional Amendment for Budgetary Stability and Deficit RestraintThe amendment of article 135 of the Constitution highlights a constitutionally unprecedented movement toward protection of the State, the State´s self-protection against external credit. Constitutional guarantees were originally guarantees of personal liberties, then guarantees of the institutions of the State or civil society, and are now for the first time self-guarantees of the State.La reforma constitucional para la estabilidad presupuestaria y contención del déficitLa reforma del artículo 135 de la Constitución es un movimiento inédito en el constitucionalismo puesto que por vez primera se orienta a la protección del propio Estado, a su sostenibilidad, ante la excesiva exposición al crédito externo. Las garantías constitucionales fueron primero garantías de libertades personales, luego garantías de instituciones del Estado o de la sociedad y ahora, por vez primera, garantías del propio Estado.

  5. RENDIMIENTO ACADÉMICO, CAUSAS DE DESERCIÓN Y CAMBIOS PERSONALES EN LOS ESTUDIANTES DEL PROGRAMA COBERTURA CON EQUIDAD EN LA UNIVERSIDAD SAN BUENAVENTURA DE MEDELLÍN. ACADEMIC ACHIEVEMENT, DROPOUT RATE CAUSES, AND PERSONAL CHANGES IN THE STUDENTS OF THE COVERAGE WITH EQUITY PROGRAM AT SAINT BONAVENTURE UNIVERSITY

    Directory of Open Access Journals (Sweden)

    Análida Estrada Bedoya

    2011-06-01

    Full Text Available El objetivo de la investigación fue analizar y describir el rendimiento académico, las causas de deserción y los cambios personales en la autoestima, la asertividad y el autocontrol, en los estudiantes del Programa Cobertura con Equidad en la Universidad de San Buenaventura (U.S.B. Se trabajó con datos cuantitativos, aplicando cuestionarios con preguntas abiertas y cerradas y cualitativamente se realizaron grupos focales, auto-reportes y entrevistas. Se describieron las relaciones con sentido que se des-cubren en la lectura de recurrencias y tendencias y se precedió hacer los análisis y dar respuesta a los interrogantes planteados, los cuales permitieron describir las características de la población y hacer análisis, a partir de un estudio de las variables de interés. Además, se presentó una propuesta formativa de inclusión para los estudiantes del programa.The objective of this piece of research was to analyze and to describe the academic achievement and the personal changes as for self-esteem, assertiveness, and self-control of the students of the Program with Equity Program at Saint Bonaventure University. In this piece of research, quantitative data, open and closed questions were used. As well, qualitative data were obtained from focal groups and self-reports and interviews were carried out. Relations with a sense, which are discovered in the reading of recurrences and tendencies, were described. Then, some analyses were made and some posed questions were answered, which let describe the characteristics of the population and make some analysis starting from a study of the variables of interest. Besides, a formative proposal of inclusion for the students of the program was introduced.

  6. Métodos experimentales de dosimetría postal para el control de calidad en radioterapia basados en LiF:Mg, Ti (TLD-100) y LiF:Mg, Cu P (GR-200) : aplicación de métodos numéricos al análisis de las curvas de termoluminiscencia

    OpenAIRE

    Muñiz Gutiérrez, José Luis

    1999-01-01

    Las aplicaciones médicas de las radiaciones están sin duda entre las que generan beneficios mayores y más directos en la calidad de vida de la población, con sus métodos diagnósticos y terapéuticos. No obstante, su empleo en actividades médicas obviamente no está exento de riesgos y precisamente es en algunas de tales aplicaciones donde el margen entre el riesgo indebido y el beneficio esperado es menor y más dependiente de la calidad del procedimiento utilizado. Por ejemplo en radioterapia, ...

  7. Kompetenceudvikling for undervisere/pædagogisk personale

    DEFF Research Database (Denmark)

    Nielsen, Birgitte Lund; Nielsen, Keld

    2017-01-01

    betragteligt under OECD’s gennemsnit med hensyn til tid brugt på (og udbredelsen af) læreres fortsatte professionelle udvikling (CPD). •At PCK (Pedagogical Content Knowledge) er en toneangivende og konstruktiv begrebsramme til at forstå læreres pædagogiske/fagdidaktiske kompetencer (nyere modeller for PCK...... inddrager bl.a. et færdigheds- og kompetenceaspekt). Det er centralt for udviklingen af PCK, at lærerstuderende deltager i aktiviteter koblet til undervisningspraksis, og at lærere og lærerstuderende løbende arbejder systematisk med at udvikle deres PCK – fx gennem diskursivt arbejde, med afsæt i konkrete...... praksiserfaringer, og samarbejde med mentorer/forskere. Der er dog et stort behov for mere solid viden om, hvad der kan understøtte læreres løbende udvikling af pædagogisk/fagdidaktisk viden og kompetence (PCK), og om forholdet mellem læreres PCK og elevers læring. •At der ikke er substantiel evidens for, hvordan...

  8. Aprendiendo en el aula: contando y haciendo relatos digitales personales

    OpenAIRE

    Gloria Londoño Monroy

    2012-01-01

    Este artículo da cuenta de una investigación cualitativa que desde una visión pluriparadigmática, interpretativa y participativa especialmente, analiza cinco intervenciones realizadas entre 2008 y 2011 con estudiantes de Educación Secundaria Obligatoria en Catalunya, España, para (a) describir y comprender las características del proceso de realización y de los productos resultantes, las condiciones y las limitaciones de aplicación y los beneficios pedagógicos que pueden ofrecer los Relatos D...

  9. La distopía de las relaciones personales

    Directory of Open Access Journals (Sweden)

    Verónica Felipe Aznar

    2012-04-01

    Full Text Available Nada es real, pues nuestras experiencias no son reales sino meras reconstrucciones de la realidad generadas por nuestro cerebro. Vivimos en una virtualidad constante y, por ello, con la llegada de las nuevas tecnologías de la comunicación las relaciones interpersonales se trasladan al mundo virtual donde los usuarios crean su nueva forma de vida.

  10. Retspsykiatrisk sygepleje: - I interaktion mellem personale og indlagte, skizofrene patienter

    DEFF Research Database (Denmark)

    Alkier Gildberg, Frederik; Bradley, S. K.; Fristed, P. B.

    2010-01-01

    af den retspsykiatriske pleje. Tidsplan Ph.d. projektet starter september 2008 og resultatet forventes at foreligge i begyndelsen af september 2011. Etik Projektet er indberettet til og godkendt af Datatilsynet og Videnskabsetisk komité for Region Syd Danmark. Finansiering Projektet fi nansieres af...

  11. Necesidades académicas, personales, sociales y vocacionales de estudiantes internacionales e intercambio en la Universidad de Puerto Rico, Recinto de Río Piedras / Academic, Personal, Social and Vocational Needs of International and Exchange Students at the University of Puerto Rico, Río Piedras Campus

    Directory of Open Access Journals (Sweden)

    Ángel A Villafañe Santiago

    2011-11-01

    Full Text Available Recibido 20 de setiembre de 2011 • Aceptado 24 de octubre de 2011 • Corregido 14 de noviembre de 2011 Resumen. El propósito de este estudio fue identificar las necesidades de una muestra de estudiantes internacionales y de intercambio que cursan estudios en la Universidad de Puerto Rico, Recinto de Río Piedras. Se exploraron datos socio-demográficos así como las necesidades académicas, vocacionales, y personales/sociales, con los fines de recopilar información de relevancia para universidades que sirven esta población y someter recomendaciones que atiendan las necesidades. Los hallazgos revelaron necesidades mayormente en las áreas académicas y vocacionales. Entre estas, se destacan la necesidad de aprender inglés o español, y el conocer sobre internados y ofrecimientos académicos en Puerto Rico y fuera del país, sueldo y oportunidades de empleo, ayudas económicas y servicios estudiantiles en la Universidad de Puerto Rico. Se proveen recomendaciones para trabajar con las necesidades identificadas ya que, según establece la bibliografía, las dificultades que confrontan estos/as estudiantes pueden afectar su desempeño académico e incluso su salud emocional. Abstract. The purpose of this study was to identify the needs of a sample of the international and exchange students staying at the North Tower Residence of the University of Puerto Rico, Río Piedras Campus. Social and demographic data, as well as the academic, vocational, and social/personal needs were explored with the purpose of gathering relevant information and submitting recommendations to universities serving this student population. Findings revealed particular needs in the academic, vocational areas, including English or Spanish learning, information on internships and study programs in Puerto Rico or abroad, salary and employment opportunities, financial aid and services available to the students of this University. Recommendations are provided to work with the

  12. Evolución de la identidad profesional de un docente novel de educación física: análisis a partir de la reflexión de sus experiencias personales y de su propia práctica

    Directory of Open Access Journals (Sweden)

    Gustavo González Calvo

    2015-03-01

    Full Text Available La presente tesis doctoral es una mirada al interior de un docente inexperto responsable de la materia de educación física así como a sus experiencias, vivencias, inquietudes y expectativas en torno a la educación y los diversos agentes que la configuran. En este sentido, la principal motivación del estudio es compartir y reconstruir los hechos importantes en la vida del educador que pueden servir de ayuda a los que se inician en la profesión. Nuestro propósito se centra en dar respuesta a la manera en que la identidad profesional de un docente novel se va construyendo y desarrollando. Para ello, se procura dar respuesta a los siguientes interrogantes: ¿cómo son de determinantes, en dicha construcción, las vivencias personales y profesionales, tanto presentes como pasadas?; ¿qué papel desempeña la formación inicial en el desarrollo de la identidad profesional?; y, por último, ¿qué posibilidades ofrece la formación reflexiva al educador para comprender y reorientar su práctica pedagógica?Metodológicamente, se opta por un paradigma de investigación de corte cualitativo-interpretativo, amparado en modelos como la investigación biográfica-narrativa y la autoetnografía. Por lo que se refiere a los instrumentos de recogida de información, se emplean los diarios de clase de diferentes cursos y niveles educativos (etapa de formación inicial, etapa de educación infantil, etapa de educación primaria, etapa de enseñanza secundaria y periodo como profesor asociado en la universidad, la historia de vida del educador en forma de autobiografía y las entrevistas con otros profesionales de la educación.El apartado de análisis de datos, en el que se detalla la manera en que se van construyendo los significados pedagógicos del educador a partir de sus experiencias, recorridos y creencias, se estructura en dos partes: las relaciones entre el docente, el alumnado y la materia de educación física; y las relaciones entre el docente

  13. Personal and interpersonal risk factors in the consumption of illicit drugs by marginal adolescents and young people from juvenile gangs Factores de riesgo personales e interpersonales en el consumo drogas ilícitas en adolescentes y jóvenes marginales de bandas juveniles Fatores de risco pessoais e interpessoais no consumo de drogas ilícitas em adolescentes e jovens marginais de bandos juvenis

    Directory of Open Access Journals (Sweden)

    Francisco Rafael Guzmán Facundo

    2008-06-01

    Full Text Available Marginal populations are groups which are known to present higher risks of drug consumption. It is possible to identify adolescents and young people from juvenile gangs that constitute this group. The purpose of this study was to analyze the effect of personal and interpersonal risk factors of drug consumption in 175 marginal adolescents and young people who belong to juvenile gangs in Mexico. Results showed a significant effect of personal factors on drug use, with an estimated variation of 26.1%. The factors that presented the highest rates were: gender, age and mental problems. The interpersonal factors (relationships with friends who have maladaptive behaviors and inappropriate relationships with parents showed an effect with an estimated variation of 15%. These results will allow for reflection and, in the future, the elaboration of adequate preventive programs aimed at this group of young people.Grupos reconocidos con mayor riesgo para consumir drogas, son los marginales, dentro de estos podemos localizar a los adolescentes y jóvenes de bandas juveniles. El objetivo del estudio fue analizar el efecto de los factores de riesgo personales e interpersonales sobre el consumo de drogas, en 175 adolescentes y jóvenes margínales de bandas juveniles de México. Los resultados mostraron efecto significativo de los factores personales sobre el consumo de drogas, con una varianza explicada del 26.1%, los factores que mostraron una mayor contribución fueron; el sexo, edad y problemas de salud mental. Los factores interpersonales (relación con amigos con conductas mal adaptadas y relación inapropiada con padres mostraron un efecto sobre el consumo de drogas, con una varianza explicada del 15%. Estos resultados posibilitarán la reflexión y en un futuro diseñar programas adecuados dirigidos a la prevención en este grupo de jóvenes.Grupos reconhecidos com maior risco para o consumo de drogas, são os de populações marginais, e, dentro destas

  14. Measurement analysis using the Fricke dosemeter; Analise de medicoes com o dosimetro Fricke

    Energy Technology Data Exchange (ETDEWEB)

    Pedrosa, G.A.C. [Instituto Nacional de Metrologia (INMETRO), Rio de Janeiro, RJ (Brazil)], e-mail: gcpedrosa@inmetro.gov.br; Dantas, C.C. [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Dept. de Energia Nuclear], e-mail: ccd@ufpe.br; Campos, C.A. [Centro Regional de Ciencias Nucleares do Nordeste (CRCN-NE/CNEN-PE), Recife, PE (Brazil)], e-mail: auster@elogica.com.br

    2003-07-01

    The Fricke dosemeter has been used for absolute determination of the radiation dose between 40 and 350 Gy for X-rays, Gamma rays and fast electrons energies. The great inconvenient of that dosimetric system is the impossibility of using for measurements of exposure or low dose rates. A Fricke dosimetry system was implanted at the Nuclear Sciences Regional Center (CRCN), in Recife, Pernambuco state, Brazil, for the determination of radiation doses for spectrometry and mass dosimetry with plasma source. The statistical analysis of the obtained results have shown that using the spectrometric method that system cna be used for maintenance of factors of CRCN standard calibrations and the dose assessment thru mail system of radiotherapy centers of the country.

  15. Development of a multichannel dosimeter for radiotherapy; Desenvolvimento de um dosimetro multicanal para radioterapia

    Energy Technology Data Exchange (ETDEWEB)

    Menezes, Claudio Jose Mesquita

    2000-06-01

    In radiotherapy, verification of the patient dose is of great important for the success of the treatment. Uncertainties in the evaluation of this dose can produce serious complications such as the loss of the control of the disease and damage to normal tissue. Semiconductor detectors present advantages over other types of radiation detectors such as ionization chambers and thermoluminescent dosimeters including small dimensions, high sensitivity and fast response. In this work, a multichannel dosimetric system is linear with dose, for a 6 MV x-ray beam and also with a beam of cobalt-60 gamma rays. The coefficients of determination of the calibration curves were better then 0,9998 in all cases. The four sensors presented similar response with the dose for different field sizes. The variation of the response was smaller than 1%. In a related study, depth dose was measured, and the results showed a good agreement compared to theoretical values. The angular response of the detectors showed a variation of 7% for angles of 45 deg C. Using the Anderson Random phantom, dose at the isocenter was determined from measurements of the surface dose. From the results obtained it can be concluded that the dosimetric system developed is adequate for the evaluation of many parameters in radiation fields used in radiotherapy. This system can be used to measure the patient entrance dose under treatment conditions, and the equipment can be used in the radiotherapy quality assurance program. (author)

  16. Características pessoais e profissionais de enfermeiros com funções administrativas atuantes em um hospital universitário Características personales y profesionales de enfermeros con funciones administrativas en un hospital universitario Personal and professional nuances of nurses who perform administration functions in the university hospital

    Directory of Open Access Journals (Sweden)

    Iraci dos Santos

    2010-03-01

    Full Text Available Considerando as características próprias dos enfermeiros que exercem funções administrativas, delimitou-se como problema: qual é o perfil do enfermeiro administrador do cuidar em enfermagem? Tem-se como objetivo: delinear o perfil do enfermeiro administrador segundo suas características pessoais e profissionais. A pesquisa se realizou em 2007, no Rio de Janeiro, através do método descritivo, aplicando-se um questionário a 66 enfermeiros exercendo cargos de chefia. Constatou-se a predominância da faixa etária entre 44 e 48 anos, com união estável e um filho. A maioria (89,39% tem dois vínculos públicos, tempo de formado de 21 a 25 anos (39,39%, preparo teórico para a liderança (80,30%, curso de pós-graduação lato sensu (36,36% e stricto sensu (36,06%. Concluindo-se que os enfermeiros administradores possuem, predominantemente, especialização em áreas clínicas, e sendo a liderança indispensável ao processo do cuidar, sugere-se que em estudos futuros seu perfil seja correlacionado aos estilos gerenciais e dimensões da liderança.Considerando las características propias de los enfermeros que ejercen funciones administrativas, se delimitó como problema: ¿cuál es el perfil del enfermero jefe, a cargo de la administración de los cuidados de enfermería? Se tiene como objetivo delinear el perfil del enfermero administrador de acuerdo a sus características personales y profesionales. La investigación se realizó en 2007, en Río de Janeiro, Brasil, a través del método descriptivo, efectuándoseles un cuestionario a 66 enfermeros en ejercicio de cargos de jefatura. Se constató el predominio de pertenencia a la faja etaria comprendida entre los 44 y 48 años, con unión estable y un hijo. La mayoría (89,39% tiene dos empleos públicos, tiempo de graduado entre 21 y 25 años (39,39%, preparación teórica para el liderazgo (80,30%, curso de postgrado lato sensu (36,36% y stricto sensu (36,06%. Se concluye entonces en

  17. Community health nursing practices in contexts of poverty, uncertainty and unpredictability: a systematization of personal experiences Prácticas de enfermería en salud comunitaria en contextos de pobreza, incertidumbre y imprevisibilidad?: sistematización de experiencias personales Práticas de enfermagem em saúde coletiva nos contextos de pobreza, incerteza e imprevisibilidade: uma sistematização de experiências pessoais na amazônia

    Directory of Open Access Journals (Sweden)

    Hélène Laperrière

    2007-10-01

    Full Text Available Several years of professional nursing practices, while living in the poorest neighbourhoods in the outlying areas of Brazil's Amazon region, have led the author to develop a better understanding of marginalized populations. Providing care to people with leprosy and sex workers in riverside communities has taken place in conditions of uncertainty, insecurity, unpredictability and institutional violence. The question raised is how we can develop community health nursing practices in this context. A systematization of personal experiences based on popular education is used and analyzed as a way of learning by obtaining scientific knowledge through critical analysis of field practices. Ties of solidarity and belonging developed in informal, mutual-help action groups are promising avenues for research and the development of knowledge in health promotion, prevention and community care and a necessary contribution to national public health programmers.Varios años de prácticas profesionales de enfermería, viviendo en los distritos más pobres de las áreas periféricas de la región amazónica de Brasil, llevaron o autor a desarrollar una mejor comprensión de poblaciones marginalizadas. La provisión de cuidados a personas con lepra y trabajadores del sexo en comunidades ribereñas ha sido llevado a cabo en condiciones de incertidumbre, inseguridad, imprevisibilidad y violencia institucional. Se pregunta como podemos desarrollar prácticas de enfermería en salud comunitaria en este contexto. Una sistematización de experiencias personales basada en educación popular es usada y analizada como un método de saber, obteniendo conocimiento científico mediante un análisis crítico de prácticas en el campo. Lazos de solidaridad y pertenencia desarrollados en grupos de acción informales, de ayuda mutua son caminos prometedores para la investigación y el desarrollo de conocimiento en la promoción de la salud, prevención y atención comunitaria y

  18. O Prouni e a conclusão do ensino superior: novas trajetórias pessoais e profissionais dos egressos El ProUni y la conclusión de la enseñanza superior: nuevas trayectorias personales y profesionales de los egresados ProUni and the conclusion of higher education: the new personal and professional trajectories of the users of the program

    Directory of Open Access Journals (Sweden)

    Daniela Patti do Amaral

    2011-12-01

    ítica pública, el ProUni ha demostrado su eficacia debido a la baja tasa de deserción escolar y también porque los nuevos graduados consiguieron nuevas trayectorias profesionales y personales.Last year we started the research ProUni and the access to Higher Education: introductory study on the users of the program in the western of the city of Rio de Janeiro, which aims, in general, to assess the overall impact of public policy in education geared to the inclusion of populations with low access to Higher Education private institutions. The survey, conducted between July 2010 and April 2011, investigated data related to the students who entered Higher Education in 2005 and 2006, the early years of ProUni in two private institutions located in the district of Campo Grande, in the area of Rio de Janeiro. Our initial hypothesis was that, after at least two years of graduation, these graduates would have built new trajectories in their lives and professional careers. The initial data, despite their limitations, indicate that, as public policy, ProUni has been demonstrating efficacy for the low drop-out rate and for the trajectories that graduates experienced in their new professional and personal lives.

  19. Performance of OSL dosimeters in clinical beams from mammography; Desempenho de dosimetros OSL em feixes clinicos empregados na mamografia

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Caio V.; Cabete, Henrique V.; Alves, Fatima F.R.; Pires, Silvio R.; Medeiros, Regina B.; Freitas, Marcelo B. [Universidade Federal de Sao Paulo (HSP/EPM/UNIFESP), SP (Brazil). Escola Paulista de Medicina; Malthez, Anna Luiza M.C. [Universidade Estadual de Campinas (CPG/FEEC/UNICAMP), Campinas, SP (Brazil). Faculdade de Engenharia Eletrica e de Computacao. Programa de Pos-Graduacao

    2015-08-15

    The search for the relationship between dose and mammography image is critical to the quality of clinical practice. In this sense, dosimetry using optically stimulated luminescent detectors (OSLD) is configured as alternative to traditional methods and allows on-site dose checks received by patients. This study aimed to verify the performance of OSL dosimeters in clinical beams typically used in mammography. For this, aluminum oxide detectors, especially designed to reduce interference on the image quality, were exposed to radiation beam combining targets and filters of a mammography equipment with digital imaging system. In addition were also employed lithium fluoride detectors irradiated under the same conditions, together with a ionization chamber for determination of dose values. A homogeneous acrylic phantom was designed and used for simulating different breast and also determine internal dose values under the irradiation conditions. The results allowed the determination of calibration factors (OSL signal x dose) of the exposed detectors to the radiation beams typically used in clinical practice. The phantom images and the comparison between TL and OSL responses suggest the possibility of routine use of the OSL dosimetry system in mammography. (author)

  20. Evaluation of influence quantities in the semiconductor dosemeters calibration;Avaliacao de grandezas de influencia na calibracao de dosimetros semicondutores

    Energy Technology Data Exchange (ETDEWEB)

    Petri, Anna R. [Pontificia Universidade Catolica (PUC/SP), Sao Paulo, SP (Brazil). Curso de Fisica Medica; Terini, Ricardo A. [Pontificia Universidade Catolica (PUC/SP), Sao Paulo, SP (Brazil). Dept. de Fisica; Pereira, Marco A.G. [Universidade de Sao Paulo (IEE/USP), SP (Brazil). Inst. de Eletrotecnica e Energia

    2009-07-01

    Semiconductor dosimeters are an alternative to the ionization chambers in diagnostic radiology, because they do not require corrections for atmospheric pressure, are rigid and produces a more large signal than ionization chambers. However, these dosimeters, in general, exhibit strong energy dependence. To perform the calibration of dosimeters it has been adopted, in this work, the 'substitution method', proposed by International Atomic Energy Agency (IAEA) in document TRS number 457. In this method, the air kerma rate measured by the dosimeter to be calibrated is compared with that of an ionization chamber previously calibrated for standard X-ray beams. The present study describes the results concerning the 'substitution method' implementation for semiconductor detectors calibration and the influence quantities evaluation in the calibration of dosimetric systems (detector and electrometer). (author)

  1. Measurement of doses to aviator pilots using thermoluminescent dosemeters; Medicion de la dosis a pilotos aviadores usando dosimetros termoluminiscentes

    Energy Technology Data Exchange (ETDEWEB)

    Azorin N, J.; Cruz C, D. [UAM-I, 09340 Mexico D.F. (Mexico); Rivera M, T. [IPN, ESIME Culhuacan (Mexico)]. e-mail: azorin@xanum.uam.mx

    2004-07-01

    During the development of their work, the aviator pilots are exposed at high levels of natural radiation of bottom caused mainly by the cosmic radiation of galactic origin and lot. For such reason, the Metropolitan Autonomous University (UAM) and the Union Association of Aviator Pilots (ASPA), subscribed an agreement with the purpose of to measure the doses of ionizing radiation received by the aviator pilots of diverse air companies that man different types of airships and to determine if these doses surpass the one limit of 0.11 mSv/h settled down by the IAEA for the public in general; and if therefore, these workers should be considered as personnel occupationally exposed. In this work the obtained results when measuring the absorbed dose received by Mexican civil aviator pilots during the development of their work, using thermoluminescent dosemeters of LiF:Mg,Cu,P + Ptfe of national production are presented. The obtained results during the years of 2001 and 2002 show that the monthly doses received by the pilots surpass the one it limits established for the public in general, for what they should be considered as personnel occupationally exposed. (Author)

  2. Development of a new dosimeter of EPR based on lactose; Desarrollo de un nuevo dosimetro de RPE basado en lactosa

    Energy Technology Data Exchange (ETDEWEB)

    Cruz C, L.; Torijano C, E.; Azorin N, J.; Aguirre G, F. [Universidad Autonoma Metropolitana, Unidad Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, 09340 Mexico D. F. (Mexico); Cruz Z, E., E-mail: eftc@xanum.uam.mx [UNAM, Instituto de Ciencias Nucleares, Circuito Exterior, Ciudad Universitaria, 04510 Mexico D. F. (Mexico)

    2014-08-15

    50 years have passed since was proposed using the amino acid alanine as dosimeter advantage the phenomenon of electron paramagnetic resonance (EPR); this dosimetric method has reached a highly competitive level regarding others dosimetry classic methods, for example the thermoluminescence or the use of Fricke dosimeters, to measure high dose of radiation. In this type of materials, the free radicals induced by the radiation are stable and their concentration is proportional to the absorbed dose may be determined by the amplitude pick to pick of the first derived of the EPR absorption spectrum. The obtained results studying the EPR response of lactose tablets elaborated in the Universidad Autonoma Metropolitana, Unidad Iztapalapa are presented. The tablets were irradiated with gamma radiation of {sup 60}Co in the irradiator Gamma beam 651-Pt of the Instituto de Ciencias Nucleares de la Universidad Nacional Autonoma de Mexico to a dose rate of 8 kGy-h{sup -1} and their EPR response in a EPR spectrometer e-scan Bruker. The obtained response in function of the dose was lineal in the interval of 1 at 10 kGy. The lactose sensibility was compared with the l-alanine, used as reference, and the result was consistently 0.25 of this. Due to the linearity shown in the interval of used dose and their low production cost, we conclude that the lactose is a promissory option for the dosimetry of high dose of radiation. (author)

  3. Study and development of new dosemeters for thermal neutrons; Estudio y desarrollo de nuevos dosimetros para neutrones termicos

    Energy Technology Data Exchange (ETDEWEB)

    Urena N, F

    1998-12-31

    An alanine-boron compound, alanine hydroborate, was synthesized and chemically characterized to be used for thermal neutrons fluence measurements. The synthesis of the compound was made by reacting the amino acid alanine with boric acid in three different media: acidic, neutral and alkaline. Physicochemical analysis showed that the alkaline medium is favorable for the synthesis of the alanine hydroborate. The compound was evaluated as a thermal neutron fluence detector by the detection of the free radical yield upon neutron thermal irradiation by Electron Paramagnetic Resonance (EPR). The present work also studies the EPR-signal response of the three preparations to thermal neutron irradiation ({phi} = 5 x 10{sup 7} n/cm{sup 2} -s). The following EPR signal parameters of the samples were investigated: peak-to-peak signal intensity vs. thermal neutron fluence {Phi} = {phi} {Delta}t ; where {Delta}t = 1, 5, 10, 20, 40, 60, 80, 90, 100, 110 and 120 h. , peak-to-peak signal intensity vs. microwave power, signal fading; repeatability, batch homogeneity, stability and zero dose response. It is concluded that these new products could be used in thermal neutron fluence estimations. (Author)

  4. Viability of the Fricke dosemeter doped with methylene blue; Viabilidade do dosimetro Fricke dopado com azul de metileno

    Energy Technology Data Exchange (ETDEWEB)

    Souza, V.L.B.; Santos, C.D.A.; Rodrigues, K.R.G.; Cunha, M.S.; Figueiredo, M.D.C.; Melo, R.T. [Centro Regional de Ciencias Nucleares do Nordeste (CRCN-NE/CNEN-PE), Recife, PE (Brazil)

    2009-07-01

    This work aims to find the possible utilization of the Fricke dosemeter doped with methylene blue (FMB) for the dosimetry of photodynamic therapy. The FMB was irradiated wit X rays and light emitted diodes demonstrating positive answers to the stimulus, being probably to be used for dosimetric objectives

  5. Use of active dosemeters as a optimization tool in hemodynamics; Uso de dosimetros ativos como ferramenta de otimizacao em hemodinamica

    Energy Technology Data Exchange (ETDEWEB)

    Nunes, Rafael; Pereira, Dirceu D. [Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ (Brazil). Inst. de Fisica; Canevaro, Lucia V. [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil); Rodrigues, Barbara B.D. [Comissao Nacional de Energia Nuclear (CNEN), Rio de Janeiro, RJ (Brazil); Ferreira, Esmeralci [Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, RJ (Brazil). Faculdade de Medicina. Servico de Hemodinamica

    2016-07-01

    Interventional cardiology procedures are, in general, associated with high doses in patients and professionals. The objective of this study is to measure the radiation levels received by professionals .The professional dosimetry was performed in a department of Hemodynamics of University Hospital in Rio de Janeiro. were followed 331 coronary angiography (CA) and 26 percutaneous transluminal coronary angioplasty (PTCA) procedures. For this, were used active dosemeters to measure the radiation levels at the chest of interventional professionals. The results show that average personal equivalent dose of doctors, per procedure was 100 e 154 μSv. On average, nursing technicians and radiologist receive 12 and 10% of doses of physicians, respectively, during CA procedures. From the results, it appears that the doses of hemodynamics exceed the annual dose limit of the standards. The use of lead shielding is presented as an effective action to reduce doses in these workers. (author)

  6. Use of active dosimeters as tool for optimization in hemodynamics; Uso de dosimetros ativos como ferramenta de otimizacao em hemodinamica

    Energy Technology Data Exchange (ETDEWEB)

    Nunes, Rafael; Pereira, Dirceu D., E-mail: rafael@bolsista.ird.gov.br [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Instituto de Fisica; Canevaro, Lucia V. [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil); Rodrigues, Barbara B.D. [Comissao Nacional de Energia Nuclear (CNEN), Rio de Janeiro, RJ (Brazil); Ferreira, Esmeralci [Universidade do Estado do Rio de Janeiro (UERJ), RJ (Brazil). Faculdade de Medicina. Servico de Hemodinamica

    2016-07-01

    Interventional cardiology procedures are, in general, associated with high doses to patients and professionals. The objective of this study is to measure the radiation levels received by the staff. The professional dosimetry was performed in a department of Hemodynamics of University Hospital in Rio de Janeiro, were followed 331 coronary angiography (CA) and 26 percutaneous transluminal coronary angioplasty (PTCA) procedures. In order to measure the radiation levels at the chest of interventional professionals outside of lead aprons, active dosemeters were used. The results show that average personal equivalent dose of doctors, per procedure was 100μSv e 154 μSv. On average, nursing technicians and radiographers receive 12% and 10% of doses of physicians, respectively, during CA and PTCA procedures. From the results, it appears that the doses of hemodynamicists could exceed the annual dose limit of the standards, if radiological protection conduct would not be applied. The use of lead shielding has showed as an effective action to reduce doses in these workers. (author)

  7. Validation of response simulation methodology of Albedo dosemeter; Validacao da metodologia de simulacao de resposta de dosimetro de Albedo

    Energy Technology Data Exchange (ETDEWEB)

    Freitas, B.M.; Silva, A.X. da, E-mail: bfreitas@nuclear.ufrj.br [Coordenacao do Programas de Pos-Graduacao em Engenharia (COPPE/UFRJ), Rio de Janeiro, RJ (Brazil). Programa de Engenharia Nuclear; Mauricio, C.L.P. [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2016-07-01

    The Instituto de Radioprotecao e Dosimetria developed and runs a neutron TLD albedo individual monitoring service. To optimize the dose calculation algorithm and to infer new calibration factors, the response of this dosemeter was simulated. In order to validate this employed methodology, it was applied in the simulation of the problem of the QUADOS (Quality Assurance of Computational Tools for Dosimetry) intercomparison, aimed to evaluate dosimetric problems, one being to calculate the response of a generic albedo dosemeter. The obtained results were compared with those of other modeling and the reference one, with good agreements. (author)

  8. Influence of temperature in polymethylmethacrylate (PMMA) dosemeters response; Influencia da temperatura na resposta de dosimetros de polimetilmetacrilato (PMMA)

    Energy Technology Data Exchange (ETDEWEB)

    Napolitano, Celia Marina; Ferreira, Danilo Cardenuto; Camargo, Fabio de; Goncalves, Josemary Angelica Correa; Tobias, Carmen Cecilia Bueno [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2005-07-01

    The use of gamma irradiation sterilization processes in medical products and food preservation has encouraged the emergence of industrial facilities responsible for generation of doses as high as a few dozen kGy. The characterization of this radiation field requires the use of dosimeters with high spatial resolution, high resistance to radiation damage, maintenance of information absorbed doses at a time suitable for the analysis and processing of data, easy handling, etc. The dosimeters that meet most of these requirements are based on polymethylmethacrylate (PMMA) with dyes sensitive to radiation. The dose that can be measured with these dosimeters extends from 100Gy to 50kGy, with the estimated accuracies by manufacturers from 2 to 3%. However, in practice, there are procedures that require irradiation in different conditions of temperature, which results in changes in the response of the dosimeter. This way, considering the irradiations made in the center of radiation technology of Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP - Brazilian nuclear and energy research institute -, has studied the effect of temperature on the response of routine dosimeters PMMA type where the operational characteristics of Gammachrome YR dosimeters type and Red Perspex are being investigated respect to temperature and dose, whose results will be presented in this paper.

  9. Study of the leakage current of clinical dosimeters for teletherapy; Estudo da corrente de fuga de dosimetros clinicos para teleterapia

    Energy Technology Data Exchange (ETDEWEB)

    Damatto, Willian B.; Santos, Gelson P.; Potiens, Maria da Penha A.; Caldas, Linda V.E.; Vivolo, Vitor, E-mail: wbdamatto@ipen.b, E-mail: gpsantos@ipen.b, E-mail: mppalbu@ipen.b, E-mail: lcaldas@ipen.b, E-mail: vivolo@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2009-07-01

    This work demonstrates the importance of quality control of clinical dosemeters and therefore the equipment for radiotherapy treatment, exhibiting the necessary care related to answers and sensibilities and the possible defects of the clinical assembly

  10. Tipos de redes personales de los inmigrantes y adaptación psicológica

    OpenAIRE

    Maya Jariego, Isidro

    2002-01-01

    Elaboramos una tipología de redes de apoyo en un colectivo de inmigrantes marroquíes (n=81), filipinos (n=69) y senegaleses (n=23) residentes en Marbella, aplicando la entrevista Mannheim de apoyo social (MISS) (Veiel, 1990, 1993). Primero realizamos tres análisis de conglomerados exploratorios utilizando como variables-criterio indicadores de (1) composición familiar y étnica, (2) funciones de apoyo, y (3) tamaño y estructura de la red. Los análisis de chi-cuadrado entre las tres clasificaci...

  11. L’immaginazione personale e teologica di Pha. m Công Tac

    Directory of Open Access Journals (Sweden)

    Janet Hoskins

    2013-10-01

    Full Text Available Uno dei testi canonici degli studi post-coloniali, “Signs Taken for Wonders” di Homi Bhabha, inizia con una lunga descrizione di un missionario indiano, degli effetti causati dalla distribuzione gratuita di alcune copie della Bibbia in hindi nel 1817 sotto un albero alla periferia di Delhi..

  12. Creación de nuevas empresas. Estrategias personales para buscar nuevas oportunidades de negocios

    OpenAIRE

    Jorge Luis Vengoechea Orozco

    2009-01-01

    Resumen:Generar ideas de negocios es un gran reto hay que empezar por gestar ideas, pensar creativamente y comenzarpor generar una lista de ideas, sin preocuparse en como se materializar la idea. Al formular las ideas se debenaceptar todo tipo de ideas, ya sean tontas o atrevidas, ideas que vayan en contra de lo que la gente piensa. Unaforma de hacerlo es contactar familiares y personas de confianza para compartir las ideas, esta es una buenamanera de deshacerse de las malas ideas y de encont...

  13. Herramienta de gestión y búsqueda de fichas personales por reconocimiento facial

    OpenAIRE

    Espinosa Montoro, Javier

    2015-01-01

    En aquest article es presenta una eina pensada per ajudar als cossos policials en la gestió i identificació de persones relacionades amb algun tipus d'acte delictiu. L'aplicació permet registrar informació d'identificacions o arrests conjunt de les persones implicades en els mateixos, oferint la possibilitat de realitzar cerques per tots els paràmetres registrats en base de dades, a més de permetre realitzar una cerca mitjançant reconeixement facial utilitzant fotografies. L'entorn de desenvo...

  14. Usos deícticos personales en narraciones orales del barrio Los Hoyos

    Directory of Open Access Journals (Sweden)

    Dra. Irina Bidot-Martínez

    2015-10-01

    Full Text Available En este trabajo se hace referencia al tratamiento de la deixis personal, específicamente la que señala a las personas presentes en el momento de la enunciación. El estudio analiza y caracteriza su empleo en las diferentes partes que conforman los relatos conversacionales producidos por hablantes del barrio Los Hoyos, uno de los más tradicionales de la ciudad de Santiago de Cuba. Interesante resulta la indagación con este carácter a partir de su estudio en narraciones orales debido a la presencia inevitable de esta manifestación lingüística en el desarrollo de las civilizaciones, en tanto se vincula a la conformación del caudal cognoscitivo inherente al hombre, al reunir una gran cantidad de conocimientos que resultan perdurables y se convierten en los depositarios más amplios del saber popular.

  15. RESILIENCIA: OTRA PERSPECTIVA DE LAS EXPERIENCIAS SOCIALES Y PERSONALES DENTRO DE LA EMPRESA

    Directory of Open Access Journals (Sweden)

    Miguel Atehortúa M.

    2002-01-01

    Full Text Available La resiliencia es un término proveniente de las ciencias físicas que resume la capacidad para desarrollar un sistema de sentir, pensar y actuar por parte de los grupos humanos o de un individuo, para lograr el enfrentamiento efectivo frente a las adversidades provenientes de la turbulencia social o empresarial. El concepto recoge aportes de las ciencias sociales y del comportamiento en escenarios comunitarios, pero tiene una evidente validez para analizar los procesos de cambio y de crisis en el ámbito organizacional-empresarial. Es probable que desde esta óptica aparezcan propuestas concretas para enfrentar la crisis que padece nuestra región.

  16. La protección de datos personales de las personas vulnerables

    OpenAIRE

    Sanchez Carazo, Carmen

    2009-01-01

    I. INTRODUCCIÓN. II. BIOÉTICA Y PROTECCIÓN DE DATOS. III. EL DERECHO A LA INTIMIDAD Y A LA PROTECCIÓN DE DATOS DE CARÁCTER PERSONAL. IV. EL TRATAMIENTO DE DATOS DE CARÁCTER PERSONAL. 1. Calidad de los datos. 2. Derecho a la información. 3. Derecho al consentimiento. 4. Derecho de acceso, rectificación, oposición y cancelación. V. EL DERECHO A LA INTIMIDAD DE LAS PERSONAS FALLECIDAS. VI. CONCLUSIÓN. BIBLIOGRAFIA. El derecho a la intimidad, confidencialidad y protección de datos de ...

  17. Sueño y realidad: expectativas personales y retos sociales

    Directory of Open Access Journals (Sweden)

    Arias Monge, Mónica

    2006-04-01

    Full Text Available Resumen:El artículo se refiere al relato de una experiencia biográfica relacionada con las vivencias, frustraciones, aspiraciones y éxitos de una persona con discapacidad visual, quien después de vencer muchos obstáculos, encuentra un camino que la conduce a su mayor aspiración, su razón de ser, el comprender como forjar sus anhelos, ilusiones y sueños, aspiración a la que todos los seres humanos, sin distingos, capacidades o discapacidades, pretendemos, pero que por una o mil razones no accedemos, no por las limitaciones a nuestro alcance si no por la falta de fortaleza, entereza y sabiduría en la toma de decisiones que nos permitan hacer realidad nuestra realización personal.Se trata de un relato donde la autora realiza un análisis introspectivo que juzga su existencia, partiendo de un marco de referencia y de contexto cultural, legal y político, contrastándolo con su vida personal en las diferentes etapas de su desarrollo intelectual, profesional, cultural y social. En este aspecto, resulta interesante como se enfatiza en las diferentes posturas sociales, unas vinculadas a la amistad y la relación familiar, otras que resultan crueles y que responden a la falta de conciencia, aletargamiento, egoísmo y celo de ciertos actores sociales, que magnánimamente podríamos llamar oportunistas, y por último otras más esperanzadoras, que en forma solidaria promueven un convivio más asentado en la concertación y en el pluralismo, en el amor al prójimo y en el reconocimiento de las diferencias que todos los seres humanos poseemos.Entre sus relatos y vivencias pedagógicas y culturales, se refiere a la ausencia de apoyo institucional y a la importancia de las relaciones de cooperación basadas en vínculos afectivos, las cuales le permiten alcanzar sus objetivos académicos.Actualmente, cursa el segundo año del Doctorado en Pedagogía. Doctorado Diversidad y Cambio en Educación: Políticas y Prácticas, de la Universidad de Barcelona.Abstract:The article narrates a biographical experience related to the live events, frustrations, aspirations and successes of a visually-impaired person, who (after conquering many obstacles finds a path to its greatest aspiration, its reason of being, understanding how to materialize its desires and dreams. An ambition sought bt all human beings, without distinction of ability or disability; seldom achieved because of a single or many reasons, but not because of our limitations, but because our lack of fortitude, probity or wisdom in the decisions we make to reach our personal realization.This is a story in which the author makes a self-examining analysis that gauges her existance, from a cultural, legal and political context or frame of reference, opposable to its personal life in the differents stages of its intellectual, professional, cultural and social development. In this aspect, it’s interesting how the different social outlooks are highlighted; some are linked to friendship and the family relationships, and others are cruel and respond to the lack of awareness, to a numbed collectivity, to selfishness and jealousy of certain social actors, who may be magnanimously dubbed “opportunists”. And finally, some other more auspicious circumstances, that in a solidary manner stimulate coexistence based on compromise and pluralism, in love towards one neighbor and in awknowledging the differences all human beings possess between themselves.In its pedagogic and cultural stories and life experiences, the author refers to the absence of institutional support and to the importance of the cooperation relationships based on affective bonds, which in turn have allowed the author reach its academic goals. Currently, the author is at the second year of its Doctorate Degree in Pedagogy, Diversity and Change in Education, Policies and Practices at the University of Barcelona.

  18. Variables contextuales y personales que inciden en el comportamiento violento del niño

    OpenAIRE

    Antonia Pelegrín; Enrique J. Garcés de Los Fayos

    2008-01-01

    La conducta agresiva de los niños, niñas y adolescentes se encuentra favorecida por una serie de variables de riesgo, denominadas también variables predictoras. La acumulación de estas variables, a lo largo de la historia de desarrollo del niño, puede predisponerle a un patrón de comportamiento más agresivo que le dificulte la adaptación a su entorno social, familiar y escolar. Las variables implicadas en la manifestación de la conducta agresiva del niño pueden ser múltiples y se clasifican e...

  19. Modelo para el fortalecimiento de las competencias personales del Director de Proyecto mediante herramientas de coaching

    OpenAIRE

    Ballesteros Sánchez, Luis Ignacio

    2017-01-01

    El Director de Proyecto es una figura estratégica para el desarrollo de las organizaciones en un entorno cada vez más complejo, competitivo y cambiante. Su rol es uno de los más críticos, requiriendo una amplia comprensión de las diferentes áreas que deben estar coordinadas y una mezcla de habilidades interpersonales, técnicas, cognitivas y de liderazgo. El rol del Director de Proyecto está evolucionando, debiendo ser reforzado con un espectro de conocimientos y habilidades complementarias a ...

  20. Smart cities, movilidad inteligente y protección de los datos personales

    Directory of Open Access Journals (Sweden)

    Alessandro Mantelero

    2016-03-01

    Full Text Available En este artículo, el autor afronta las cuestiones relativas a la protección de datos en el contexto de amplios proyectos de movilidad territorial. En la primera parte, se describen brevemente los sistemas de movilidad inteligente y los problemas que de ellos se derivan, con especial atención a su incidencia sobre la dimensión individual y colectiva de la protección de datos. La segunda parte del artículo analiza
    cómo se han afrontado estos aspectos en Italia, en el ámbito de un proyecto piloto concreto que ha involucrado a entes de transporte, gobiernos locales y a la academia.

  1. Er screening af kapselendoskopiske undersøgelser udført af ikkelaegeligt personale anvendelig?

    DEFF Research Database (Denmark)

    Ewertsen, Caroline; Svendsen, Claus Bo Søndergaard; Svendsen, Lars Bo

    2006-01-01

    in gastroenterology and two laboratory technicians independently viewed 34 consecutive WCEs and noted all findings. Thereafter, two specialists reviewed the findings made by the technicians independently in order to make a diagnosis. The results were compared with the diagnosis made by the first specialist, who...

  2. Consecuencias personales en la ruptura de la vida laboral. El caso de Telefónica

    Directory of Open Access Journals (Sweden)

    María Victoria Inmaculada Velasco Juez

    2006-09-01

    Full Text Available Desde mediados de los años setenta, el mundo del trabajo de los países occidentales comienza a cambiar progresivamente en su estructura y fisonomía. En los últimos años, como consecuencia de la búsqueda de competitividad y la política de fusiones y adquisiciones llevada a cabo en España por algunas grandes empresas, han aumentado de forma significativa las reducciones de plantilla. Considerando que estamos ante un proceso cultural de las sociedades contemporáneas y siendo parte integrante de ese colectivo, cada día más numeroso, de personas desvinculadas del trabajo remunerado a una edad temprana, estudié qué supone este hecho para un grupo de trabajadores de Telefónica. Esta empresa está llevando a cabo la mayor regulación de empleo de nuestro país; terminará 2007, por un plan iniciado en 1993, con una plantilla reducida en un 66 %. Para analizar cómo afecta este hecho a los trabajadores y en qué ámbitos, aspectos y dimensiones de su vida, tuve en cuenta las diferencias de interpretación de sus experiencias en cuanto al tiempo, al espacio y a la sociabilidad. También consideré las diferencias individuales: género, situación familiar, formación, trayectoria laboral, puesto que se ocupaba en la empresa, estrategias de ocupación del tiempo de ocio, etc. A partir de la etnografía se concluye que, siendo la actividad laboral remunerada un factor de identidad personal y social, un factor de integración y estructuración del ser humano, desde una perspectiva antropológico-social, la ruptura de dicha trayectoria, a una edad temprana y de forma brusca y no deseada, conlleva la necesidad de ajuste en todas las actividades del ser humano.

  3. El género biográfico: reflexiones y experiencias personales

    Directory of Open Access Journals (Sweden)

    José Ortiz Monasterio

    2018-01-01

    Full Text Available El género biográfico, de tan antiguo y tan extendido, requiere un análisis de larga duración. Se detecta la aparición de la biografía desde las ta- blillas de barro que cuentan la vida de Gilgamesh y su angustia por la muerte. Se advierte que no es posible comprender un texto de hace 5 000 años sin re- construir el horizonte de expectativas de la época. Esta angustia por la muerte también está presente en Netzahualcóyotl. De otra manera, más didáctica y moral comentamos las vidas de Plutarco, modelo para los biógrafos de siglos por venir. Se intenta entrelazar autores mexicanos y extranjeros para dar lo que podríamos llamar efecto carrusel, donde los autores mexicanos obtienen la universalidad. En la segunda parte comento algunas experiencias persona- les en torno al género biográfico que abarcan diversos subgéneros, desde las biografías colectivas hasta mi biografía de Vicente Riva Palacio y un acerca- miento literario a la vida de Vicente Guerrero Saldaña.

  4. Creación de nuevas empresas. Estrategias personales para buscar nuevas oportunidades de negocios

    Directory of Open Access Journals (Sweden)

    Jorge Luis Vengoechea Orozco

    2009-01-01

    Full Text Available Resumen:Generar ideas de negocios es un gran reto hay que empezar por gestar ideas, pensar creativamente y comenzarpor generar una lista de ideas, sin preocuparse en como se materializar la idea. Al formular las ideas se debenaceptar todo tipo de ideas, ya sean tontas o atrevidas, ideas que vayan en contra de lo que la gente piensa. Unaforma de hacerlo es contactar familiares y personas de confianza para compartir las ideas, esta es una buenamanera de deshacerse de las malas ideas y de encontrar nuevas oportunidades de negocios, al contactar amigosy personas allegadas se puede saber qué opinan de las ideas y que nuevas ideas o mejoras podrían sugerir ellos.Palabras claves:Ideas, negocios, emprendimiento, emprendedor.Abstract:Generate business ideas is a challenge we must begin by developing ideas, think creatively and begin to generatea list of ideas, without worrying as to materialize the idea. In formulating the ideas must accept all kinds of ideas,whether silly or daring ideas that go against what people think. One way is to contact family and people you trust toshare ideas, this is a good way to get rid of bad ideas and find new business opportunities, to contact friends andsignificant others can know what you think of the ideas and new ideas or improvements that might suggest them.Keywords:Ideas, business, entrepreneurship, entrepreneurial

  5. Patrones de cambio de las redes personales de inmigrantes en Cataluña.

    Directory of Open Access Journals (Sweden)

    Molina, José Luis

    2008-12-01

    Full Text Available By analyzing two waves of personal networks of immigrants to Catalonia (Spain with a period of 1.5-2 years in between, a general model of change resulting from migration is proposed and people explanations that account for the observed changes are coded.The analyzed communities are Argentineans (n=25, Dominicans (n=16, Moroccans (n=13, and persons from Senegal and Gambia (n=13. It turns out that getting a job and the participation in courses and team sport pushes for change that follows the proposed general model (evolution. In contrast, marrying a partner of the same origin, getting children, participating in an ethnic association, traveling to the country of origin, and being visited by kin and friends frequently leads to change in the opposite direction (involution. The use of meta-visualizations of personal networks facilitates the comparison of networks of the same individual at different time points, as well as the comparison of networks aggregated over different communities. This aggregation shows that each of the four communities exhibits different ways of adaptation and change.

  6. Soluciones Maxmin en Juegos de Negociación n-Personales

    OpenAIRE

    Rubiales V.; Monroy L..; Mármol A.M.

    2002-01-01

    En este trabajo proponemos utilizar el criterio maxmin para obtener soluciones equilibradas en juegos de negociación de n agentes. Se analizan las relaciones existentes entre las soluciones obtenidas al utilizar un criterio consistente en la maximización del mínimo de las utilidades obtenidas por los agentes en relación al punto de desacuerdo, y algunas soluciones axiomáticas clásicas, como son la solución de Kalai-Smorodinsky, la solución igualitaria y en general, la familia de solucion...

  7. Privacidad y Facebook: estudio sobre los datos personales en las redes sociales online

    OpenAIRE

    Fernández Morán, Carlos

    2011-01-01

    Trabajo de Fin de Máster del Máster de Sistemas de Información Digital, curso 2010 - 2011 [ES] En el año 2004 nació una nueva forma de comunicación por Internet creada en un principio como punto de encuentro entre antiguos compañeros de clase, un lugar donde relacionarse con amigos u otras personas con gustos comunes: Facebook. A lo largo de estos años la red social ha conseguido un número de usuarios tan importante que ni sus propios creadores contaban con ello. El siguiente trabajo no...

  8. Assessment of pain perception depending on personallity type among patients with diagnosed discopathy

    OpenAIRE

    Lewandowska, Agnieszka; Adasik, Agnieszka; Noga, Aleksandra

    2016-01-01

    Background: The most common symptom among people suffering from spinal degeneration is pain. The character of the pain is usually intermittent – periods of increased pain are interchangeable with periods of remission. The perception of pain can be affected by various physical (obesity, lack of activity, non-observance of ergonomics at work), as well as psychological factors – emotional, cognitive and personality. In treatment of pain, rehabilitation (kinesiotherapy and physiotherapy) is of pa...

  9. Notes on Jurisprudence: The Lease of State Private Property and Its Intuitu Personale Nature

    Directory of Open Access Journals (Sweden)

    Ovidiu PODARU

    2011-10-01

    Full Text Available Starting from a case of the jurisprudence of the Cluj Court of Appeal, this study probes into the different aspects of the contract of lease for lands pertaining to the State’s private domain (that is, under the Local Council’s management through which the lessees, in consideration of certain special criteria, procure the right to employ the land for a fixed term of 99 years, in order to build individual housing units. The fundamental issue that needs to be addressed is whether the lesser can one-sidedly increase the rent due to the fact that a third party buyer, to whom the initial lessee sold the building, failed to comply with the special conditions that led to the initial abatement of rent. It is reasonable to assume that such a decision would be illegal taking into account that the lease contract has a civil nature and not an administrative one (as a result the lesser cannot unilaterally alter the contract and, on the other hand, the fact that this type of contract does not retain its intuitu personae nature throughout its period of enforcement (considering the provisions under art. 41 of Law no. 50/1991 on construction permits, even though that attribute was essential at the moment when the contract was concluded.

  10. El Uso de Pronombres Personales en La Oralidad Mexicoamericana de Houston, Texas

    Science.gov (United States)

    Richarte, Itzel

    2013-01-01

    This study examined the +/- presence of Spanish subject personal pronouns ("yo," "el/ella," "nosotros/nosotras," and "ellos/ellas" ) in sociolinguistic interviews of 36 Mexican-Americans from Houston, Texas (16 of 2nd generation and 20 of 3rd generation), and 20 Mexicans (control group) from Heroica…

  11. La protección de datos personales en la legislación ecuatoriana.

    OpenAIRE

    Espinosa Segovia, Carlos

    2005-01-01

    La presente temática de investigación, ha despertado en mi el interés propio de llegar a puntualizar ciertas situaciones, que amparadas en el avance científico tecnológico, pueden ocasionar un verdadero caos en lo que respecta a la privacidad de la información de las personas en nuestra sociedad y determinar ciertos correctivos en base a reformas de orden legal a fin de coadyuvar a una correcta aplicación tecnológica preservando lo atinente a información reservada particular. Hoy en día, los...

  12. Er screening af kapselendoskopiske undersøgelser udført af ikkelaegeligt personale anvendelig?

    DEFF Research Database (Denmark)

    Ewertsen, Caroline; Svendsen, Claus Bo Søndergaard; Svendsen, Lars Bo

    2006-01-01

    INTRODUCTION: Reading a wireless capsule endoscopy (WCE) may be time-consuming. In order to reduce the time needed by a physician to view a WCE, we investigated if other medical professions could preview the video and detect bowel pathology in advance. MATERIALS AND METHODS: A specialist...

  13. Plan regulador 1960-1980 ciudad de Concepción. Remembranzas personales en su Cincuenta Aniversario

    Directory of Open Access Journals (Sweden)

    Roberto Goycoolea Infante

    2010-12-01

    Full Text Available La reconstrucción de Concepción tras el terremoto del 27/02/2010 coincide con los 50 años del Plan Regulador de Concepción de 1960, del que fui coautor con Emilio Duhart. Con altibajos, este documento guió el urbanismo penquista tras el terremoto de 1960 a 1980. Para rememorar el aniversario y contribuir al debate sobre el futuro Plan Regulador, parece oportuno dejar constancia del modo en que se estudió y redactó el citado plan, de las consideraciones regionales y mundiales sopesadas, de las principales decisiones de diseño urbano, arquitectónico y paisajístico, de sus intenciones económicas y viales; así como de la concreción de estas ideas en sistemas de gestión y normas específicas. Pero, sobre todo, entendemos oportuno insistir en el enfoque social y arquitectónico de la planificación acometida.

  14. Los objetos personales favoritos en la adultez y senectud. Una aproximación empírica

    OpenAIRE

    Yuste Rossell, Nazario; González Almagro, Ignacio

    1998-01-01

    Sobre dos grupos de edad (348 adultos y 203 ancianos), y mediante un Cuestionario, basado en otro de Kamptner, Kayano y Peterson (1989), examinamos qué objetos se prefieren en la Infancia y Adolescencia, y cuáles actualmente; si estos cambian por circunstancias especiales, cuáles de los que se carece se desean, y qué sentimientos afloran ante su pérdida. Se busca mostrar, en una primera aproximación, si existe apego a los objetos, y su sentido e importancia a lo la...

  15. Protección de datos personales y tecnología. En busca del paraíso perdido

    Directory of Open Access Journals (Sweden)

    Juan Antonio Travieso

    2016-06-01

    Full Text Available La tecnología informática produce cambios que influyen en la sociedad, especialmente con la globalización en relación a la información, que presiona de manera dramática sobre un nuevo concepto de la privacidad. El tema no es señalar problemas, sino  hallar soluciones a los dilemas que presionan a la sociedad y la transforman haciendo de cada nuevo progreso una verdadera amenaza. Las normas jurídicas constituyen una parte  del enfoque, pero el conflicto se produce cuando el derecho choca con la tecnología . En ese punto, parecería que se delimita un espacio de lujuriosa libertad con un sutil anonimato y una diversión misteriosa que la persona humana había perdido.

  16. Recursos personales positivos en la relación con el paciente: las estrategias de regulación emocional

    OpenAIRE

    Rodríguez-Carvajal, Raquel; Moreno-Jiménez, Bernardo; Rivas-Hermosilla, Sara de; Herrero Lázaro, Marta

    2011-01-01

    El personal sanitario se enfrenta continuamente en su ámbito laboral a grandes presiones, en muchos casos, relacionadas con altas demandas emocionales por la relación profesional-paciente. En este contexto, las estrategias de regulación emocional se muestran como un importante recurso del personal sanitario para el manejo de las emociones hacia objetivos deseables. En el presente artículo se expone una revisión sobre la influencia de las emociones en el contexto laboral, los distintos modelos...

  17. Personal experience on 71 consecutive patients with acute cholecystitis; Esperienza personale in settantuno pazienti consecutivi con colecistite acuta

    Energy Technology Data Exchange (ETDEWEB)

    Pinto, A.; Romano, L.; Scaglione, M.; Pinto, F. [Azienda Ospedaliera di Rilievo Nazionale A. Cardarelli, Neaples (Italy). Dipt. di Diagnostica per Immagini; Romano, S.; Grassi, R.; Cappabianca, S. [Neaples Seconda Univ., Neaples (Italy). Ist. di Scienze Radiologiche; Del Vecchio, W. [Neaples Univ. Federico 2, Neaples (Italy). Ist. di Radiologia

    2000-02-01

    Acute cholecystitis is one of the most frequent abdominal inflammatory processes. If untreated or misdiagnosed it can result in severe complications such as gallbladder rupture, abscesses, or peritonitis. It was retrospectively reviewed a series of 71 consecutive patients with surgical confirmation of acute cholecystitis and then compared the results of the diagnostic techniques that have been used preoperatively. Over 16 months, 71 consecutive patients (42 women and 29 men; age range: 34-84 years, mean: 58) with acute abdominal pain were operated on for acute cholecystitis at Cardarelli Hospital, Naples. On abdominal plain films, it was retrospectively searched the following signs: densities projected over the gallbladder, linear calcifications in gallbladder walls, gallbladder enlargement, focal gas collections within the gallbladder, and air-fluid levels in the gallbladder wall lumen. On US images it has been looked for: gallbladder wall thickening (>3 mm), intraluminal content in the gallbladder, pericholecystic fluid, US Murphy's sign, and gallbladder distension. On CT images, it has been investigated: gallbladder distensions, wall thickening, intraluminal content, pericholecystic fluid, and inflammatory changes in pericholecystic fat. On plain abdominal films it was found densities projected over the gallbladder (16.9%) and linear calcifications in the gallbladder wall (4.6%). US appears to be the most useful imaging technique in patients with suspected acute cholecystitis, for both screening and final diagnosis. CT plays a limited role in the early assessment of these patients, but can a useful tool in diagnosing acute cholecystitis in patients with questionable physical findings or in investigating related complications. [Italian] La colecistite acuta e' una delle flogosi addominali con riscontro piu' frequente. Presenta complicanze (perforazione, ascesso, peritonite) quando non curata o non diagnosticata. Gli autori conducono l'analisi retrospettiva su 71 pazienti consecutivi affetti da colecistite acuta confermata all'intervento chirurgico: sono indicate le indagini radiologiche eseguite nella fase preoperatoria e sono confrontati i reperti osservati in ciascuna procedura diagnostica. Nell'arco di tempo di 16 mesi, 71 pazienti consecutivi (42 femmine e 29 maschi con eta' compresa tra 34 e 84 anni, eta' media 58 anni) con sintomatologia addominale acuta sono stati operati per colecistite acuta presso l'Azienda Ospedaliera A. Cardarelli di Napoli. L' esame diretto dell'addome e' stato eseguito in 65 casi su 71, l'ecografia addominale in 69 e la TC in 6. All'esame ecografico sono stati ricercati: ispessimento delle pareti colecistiche (>3 mm), contenuto endocolecistico, liquido pericolecistico, segno di Murphy ecografico e sovradistensione della colecisti. All'esame TC dell'addome sono stati ricercati: distensione della colecisti, ispessimento delle pareti colecistiche, contenuto endocolecistico, liquido pericolecistico e alterazioni di tipo infiammatorio nel grasso pericolecistico. Con l'indagine diretta dell'addome sono stati identificati i seguenti reperti: radiopacita' proiettantesi sull'immagine colecistica (16,9% dei casi) e calcificazioni lineari della parete colecistica (4,6%). L'ecografia rappresenta la metodica di scelta nello studio della colecistite acuta giacche' consente nella maggioranza dei casi di formulare la diagnosi definitiva. La TC riveste un ruolo trascurabile nella valutazione iniziale dei pazienti con colecistite acuta. Essa puo' essere utile nei casi dubbi di colecistite acuta o di discrepanza clinico-ecografica oppure nelle forme complicate.

  18. Protección de Datos Personales vs Redes Sociales: los retos de la Web 2.0

    OpenAIRE

    Juárez Campos, Veronica

    2010-01-01

    Presentation for the Round Table "Personal data protection vs Social Network: the Web 2.0 Challenges", this round table was part of the activities of the Juridical Book Fair, in Zacatecas, Mexico. This presentation tried to show the advantages of using Social Network for profesional promotion, as well as the importance of using responsibly all of these tools with special attention to personal data.

  19. La dispersión geográfica de las redes personales: cálculo y significado.

    Directory of Open Access Journals (Sweden)

    Molina, José Luis

    2011-06-01

    Full Text Available This article compares three indices that represent the geographical dispersion of personal networks. The first index is built on the computation of distances for each Ego with their Alters and among each one them. After calculating the total distance, it is obtained the average for each Ego. The absolute value of the logarithm of this average is the proposed measure. The second index is constructed taking into account only the relations Ego-Alter of the above formula and the third, common in such studies, shows the distribution of active contacts in a ranking of distances (same neighbourhood, same city, Catalonia, rest of Spain, other countries.The comparison is made exploring the effect of the three indexes on the exchanged social support of people living in Catalonia. The data are taken from the survey of personal networks in the project CASREDIN, interested in exploring social networks and social cohesion in Catalonia. Thus, the resident population divided between "national” and "migrants" and in each of the groups social support is evaluated depending on the geographic dispersion of personal networks. Finally, we propose a discussion of the results within the framework of the theory of "transnationalism".

  20. Factores personales y ambientales asociados con el desplazamiento activo al colegio de los escolares españoles

    Directory of Open Access Journals (Sweden)

    Emilio Villa-Gonz\\u00E1lez

    2012-01-01

    Full Text Available The purpose of this study was to analyse the associations of personal and environmental factors with mode of commuting to school in children. A total of 745 schoolchildren (363 girls aged 6-12 years from the province of Granada (Spain participated in the study. Participants completed a questionnaire about mode of commuting to school, personal factors (i.e. barriers to walking to school, enjoyment on the way to school, who they go to school with and environmental factors (i.e. time from house to school, distance to school, and safety on the way. A total of 57.2% children walked to school, 40.3% used the car, 1.2% motorcycled, .7% used the bus and .6% bicycled. Travelling alone to school [Odds ratio (OR, 10.049; 95% confidence interval (CI, 3.950 - 25.567], living close to the school (OR, 16.439; 95%CI, 5.717- 47.271 and perceiving a safe way to school (OR, 2.365; 95%CI, 1.665- 3.360 were associated with active commuting to school.

  1. Diferencias en el perfil de competencias personales y socioemocionales en estudiantes universitarios de ciencias y educación

    Directory of Open Access Journals (Sweden)

    María Pilar Cantero Vicente

    2008-06-01

    Full Text Available El presente trabajo tiene como objetivo principal analizar las diferencias existentes entre estudiantes universitarios de titulaciones pertenecientes al ámbito científico y educativo, en distintos aspectos de la inteligencia. En concreto, se trata de establecer el perfil de competencias intelectuales y socio-emocionales característico de una muestra de estudiantes pertenecientes a cada uno de los grandes ámbitos, el científico y el educativo. El estudio se realizó sobre una muestra representativa de estudiantes pertenecientes a las Facultades de Educación y Ciencias de la Universidad de Alicante (España. Los instrumentos de evaluación utilizados incluyen una prueba de inteligencia general y distintas medidas de inteligencia emocional. Los resultados del análisis discriminante entre ambos grupos pusieron de manifiesto que las variables consideradas, tomadas en su conjunto, discriminan de forma significativa entre los perfiles de ambos grupos. Estas diferencias se sitúan, sobre todo, en los aspectos de la inteligencia general y en los factores intra e interpersonal de la inteligencia emocional.

  2. Memoria personal e Historia nacional: conversando con Suso de Toro - Memoria personale e Storia nazionale: conversazione con Suso de Toro

    Directory of Open Access Journals (Sweden)

    Sara Polverini

    2014-12-01

    Full Text Available In the following interview, Suso de Toro recalls his career as a novelist from the beginnings to the present day. He focuses on the evolution of his narrative style against the backdrop of the recent Spanish historical context. The author concentrates on those works that characterize him as an engaged writer: Non volvas (2000, Home sen nome (2006, Sete palabras (2010 e Somnámbulos (2014.

  3. Relación de las actitudes personales y de la norma social con la actividad sexual de los adolescentes*

    Directory of Open Access Journals (Sweden)

    Elvia Vargas Trujillo

    2004-02-01

    Full Text Available Using a sample of 326 high-school students (178 males, 144 females, 4 participants who did not indicate their sex between 13 and 18 years old, from lower, middle and upper socio-economic levels, the relationship between personal attitude and the perceived social norm (perception of friends' attitude and of peer norm was examined with several indicators of the sexual activity of participants.A self-report questionnaire was used in order to get information about the variables of the study. The analysis of information showed that only one 31 percent of the young participants had had penetrative sexual relationships. Correlation and regression analyses support the statements of Reasoned Action Theory on the importance of personal attitude and the youth's perception of the social norm in explaining sexual activity during adolescence. The study's predictive variables explain between a 10 percent and a 60 percent variability of each one of the sexual activity indicators. It was statistically verified that the influence of perception of sexual attitudes of friends on penetrative sexual activity takes place through the personal sexual attitude. These results confirm the role of cognition in healthy behaviour and point to the need to bear it in mind in programs of sexual and reproductive health promotion campaigns.

  4. INCIDENCIA DE FACTORES PERSONALES Y LABORALES EN LOS SALARIOS DEL SECTOR HOSTELERO: UNA VISIÓN DE GÉNERO

    Directory of Open Access Journals (Sweden)

    Míriam Ons-Cappa

    2017-01-01

    Full Text Available Este artículo aporta evidencia empírica sobre las diferencias en los rendimientos salaria - les desde una perspectiva de género en el sector hostelero español, comparándolas con otros sectores de la economía española. Mediante la estimación de una función minceriana, los resultados obtenidos revelan una significativa diferencia negativa del rendimiento del capital humano en la hostelería frente al resto de sectores y una mayor penalización salarial asociada al rendimiento educativo para el caso de la mujer en la hostelería, en contraposición a lo que ocurre en el resto de sectores analizados.

  5. Commercial sugar, an alternative dosemeter for the dose determination in radiological emergency conditions; Azucar comercial, un dosimetro alternativo para la determinacion de dosis en situaciones de emergencia radiologica

    Energy Technology Data Exchange (ETDEWEB)

    Urena N, F.; Galindo, S. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1997-07-01

    It was carried out the dosimetric evaluation of commercial sugar, with the purpose to determine the feasibility to be able to use this type of substance as a dosimetric material in cases to present some radiological emergency cases. The studied parameters using the Electron Paramagnetic Resonance (EPR) technique were: pre-doses signal or depth signal, dose-response stability, reproducibility, reliability and signal clearing decreasing. (Author)

  6. Thermoluminescent and optical processes in alkaline halogenides dosemeters contaminated with Europium; Procesos opticos y termoluminiscentes en dosimetros de halogenuros alcalinos contaminados con Europio

    Energy Technology Data Exchange (ETDEWEB)

    Barboza F, M.; Melendrez, R.; Castaneda, B.; Pedroza M, M.; Chernov, V.; Perez S, R.; Aceves, R. [Centro de Investigacion en Fisica, Universidad de Sonora, A.P. 5-088, 83190 Hermosillo, Sonora (Mexico)

    2000-07-01

    Recent research results are presented about the properties of the optical processes of photo transferred thermoluminescence (TLFT), optical whitening (BO), thermoluminescence induced by light (TLL) and its effect in the thermoluminescent curve (Tl) produced by ionizing and non-ionizing radiation. The systematic analysis of all these processes, acquires a singular importance due that actually the alkaline halogenide crystals are object of intense investigations which analyse their potential applications as detectors and radiation dosemeters through stimulated optical luminescence techniques or thermoluminescence. The obtained data show that the Tl curve of material with this nature can be enormously affected by exposure of phosphorus to the environmental light or UV. This is in part due to liberation processes of charge bearers are shouted and makes a subsequent trapping in less temperature traps; at the same time that induce changes in the intensity of determined Tl bands. Additionally, also it is observed that mentioned phenomena are related as with wavelength of incident light as of the illumination time. Finally, the obtained information allows to conclude that although the illumination effect is extremely complex, it is associated and can be explained mainly with phenomena that implicate the electrons excitation trapped in form of F centers and trapping mechanisms or radioactive and non-radioactive recombination. (Author)

  7. Determination of isodose curves in Radiotherapy using an Alanine/ESR dosemeter; Determinacion de curvas de isodosis en Radioterapia usando un dosimetro de Alanina/ESR

    Energy Technology Data Exchange (ETDEWEB)

    Chen, F.; Baffa, O.; Graeff, C.F.O. [Departamento de Fisica e Matematica. Universidade de Sao Paulo FFCLRP. 14040-901 Ribeirao Preto-SP (Brazil)

    1998-12-31

    It was studied the possible use of an Alanine/ESR dosemeter in the isodose curves mapping in normal treatments of Radiotherapy. It was manufactured a lot of 150 dosemeters with base in a mixture of D-L Alanine dust (80 %) and paraffin (20 %). Each dosemeter has 4.7 mm diameter and 12 mm length. A group of 100 dosemeters of the lot were arranged inside 50 holes of the slice 25 of the phantom Rando Man. The phantom irradiation was realized in two opposed projections (AP and PA) in Co-60 equipment. A group of 15 dosemeters was take of the same lot for obtaining the calibration curve in a 1-20 Gy range. After irradiation the signal of each dosemeter was measured in an ESR spectrometer operating in the X-band ({approx} 9.5 GHz) and the wideness of Alanine ESR spectra central line was correlated with the radiation dose. The wideness dose calibration curve resulted linear with a correlation coefficient 0.9996. The isodose curves obtained show a profile enough similar at comparing with the theoretical curves. (Author)

  8. Determination of the dose index in computerized tomography using thermoluminescent dosemeters; Determinacion del indice de dosis en tomografia computada usando dosimetros termoluminiscentes

    Energy Technology Data Exchange (ETDEWEB)

    Azorin, J.C.; Calderon, A. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada-IPN, 11500 Mexico D.F. (Mexico); Azorin, J. [UAM-I, 09340 Mexico D.F. (Mexico)

    2004-07-01

    In this work the obtained results of the determination of the dose index are presented in thorax studies in computed tomography and helical tomography carried out in Mexico using thermoluminescent dosemeters of LiF: Mg,Cu,P + Ptfe developed and manufactured in our country. The results showed that under similar conditions of irradiation and operation (pitch = 1), significant differences don't exist among the doses absorbed measures in the phantom due to the two types of used tomographs. (Author)

  9. Qualification of the monitor Pug-7N like dosimeter for neutrons; Habilitacion del monitor PUG-7N como dosimetro para neutrones

    Energy Technology Data Exchange (ETDEWEB)

    Benites R, J. L. [Centro Estatal de Cancerologia de Nayarit, Av. Enfermeria, Fracc. Fray Junipero Serra, 63000 Tepic, Nayarit (Mexico); Vega C, H. R.; Murillo O, R. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Calle Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas (Mexico); Velazquez F, J. B., E-mail: jlbenitesr@prodigy.net.mx [Universidad Autonoma de Nayarit, Postgrado CBAP, Carretera Tepic Compostela Km. 9, Xalisco, Nayarit (Mexico)

    2011-10-15

    By means of an inter-comparison method, the monitor for neutrons Pug-7N was enabled like dosimeter for neutrons of two magnitudes: the environmental equivalent dose, H*(10), and the H equivalent dose. The monitor Pug-7N has a plastic detector of scintillation Pns-20 that can be used inside or outside of its polyethylene cylindrical moderator. This designed to detect the neutrons presence that is shown in ana logical form by means of a fast count. Although the instrument is useful to detect the neutrons presence its design it does not allow to estimate the dose. With the purpose of enabling it as dosimeter for neutrons, their response was compared with the response of the area monitor for neutrons Bert hold Lb 6411 and Eberline NRD model Asp-1. Under the same irradiation conditions the 3 instruments were exposed to a source of {sup 241}AmBe of 3.7E(9) Bq (100 mCi) of activity whose spectrum and dosimetric magnitudes were determined with a spectrometric system of Bonner spheres with scintillator of {sup 6}Lil(Eu) and the NSDUAZ code. Conversion factors of H*(10)/cpm and H/cpm were obtained for the two options of the monitor detector Pug-7N, with this procedure the monitor Pug-7N besides determining the presence of neutrons, it has been enabled for their use as dosimeter for neutrons. (Author)

  10. Characterization of OSL dosemeters for application in dose evaluation in computerized tomography procedures; Caracterizacao de dosimetros OSL para aplicacao em avaliacoes de doses em procedimentos de tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Martins, Louise M.G.; Santos, Josilene C.; Umisedo, Nancy K.; Terini, RIcardo A.; Costa, Paulo R. [Universidade de Sao Paulo (USP), SP (Brazil). Instituto de Fisica

    2016-07-01

    This work aims to present results of the characterization of Al{sub 2}O{sub 3}:C optically stimulated luminescent detector (OSLD). The following aspects were studied: sensitivity, energy response and air kerma dependence in computed tomography (CT) energy range. The main objective of this work is to evaluate the applicability of this kind of dosimeter for CT organ dose assessment. The energy response showed a non-homogenous pattern which has already been found in literature. The air kerma dependence of OSL signal showed a linear trend. Concerning their sensitivity, it was observed that the same batch can have different responses for the same quality, after a second irradiation step, which shows that this kind of detector should be used with care in case of more than one irradiation. (author)

  11. Radiation condition in computerized tomography (CT): determination and calibration of dosemeters; Condicoes de radiacao em tomografia computadorizada (TC): determinacao e calibracao de dosimetros

    Energy Technology Data Exchange (ETDEWEB)

    Adrade, L.C.; Peixoto, J.G.P., E-mail: lucio-andrade@hotmail.com [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2016-07-01

    RQT is the standard for radiation conditions in computed tomography . It simulates a beam unrelieved of a CT scanner . The camera pencil ionization dosimeter is used in CT. The LNMRI become known characterization of RQT radiation conditions and the secondary standard calibration for type pencil ionisation chambers in its lab. The obtained beam has the characteristics required by IEC 61267. The results of the calibration presented combined uncertainty expanded to 95.45% from 2.22% . (author)

  12. Dosimetry for computed tomography using Fricke gel dosimetry and magnetic resonance imaging; Dosimetria em tomografia computadorizada empregando dosimetro Fricke gel e a tecnica de imageamento por ressonancia magnetica

    Energy Technology Data Exchange (ETDEWEB)

    Capeleti, Felipe Favaro; Campos, Leticia L., E-mail: felipe@gmpbrasil.com.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2014-04-15

    In this work it was determined a new method for the determination of absorbed doses in Computed Tomography (CT) examinations using Fricke gel dosimetry developed at IPEN. Absorbed doses were determined by different methods of analysis, such as optical absorption spectrometry, ionization chambers and magnetic resonance imaging. Lower limit of sensitivity of the Fricke gel solution, the solution repeatability signal Fricke gel and CT equipment, detection sensitivity, among other tests were performed. Different equipment of computed tomography with multiple detectors were used. The Fricke gel solution showed better repeatability than ±5.5% using the technique of optical absorption spectrophotometry and computed tomography equipment showed repeatability better than ±0.2%. The Fricke gel solution features an easy and relatively quick preparation, but it is necessary to be careful not to contaminate and lose the solution. With the results, it was confirmed the application of this type of dosimetry for computed tomography equipment. (author)

  13. Development of new dosemeters of CaSO{sub 4}; Desenvolvimento de novos dosimetros a base de CaSO{sub 4}

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Ana Gabryele M. dos; Junot, Danilo O.; Souza, Divanizia N. [Universidade Federal de Sergipe (UFSE), Sao Cristovao, SE (Brazil)

    2016-07-01

    Thermoluminescent dosimeters (TLDs) are widely used in in vivo dosimetry because of their simple production, viability for dose determination in difficult geometries and their reusability. The motivation of this work was to produce CaSO{sub 4} crystals doped with thulium (Tm) and analyze their thermoluminescent (TL) properties. The crystals were produced by a variation of slow evaporation route, and TL curves showed emission peaks centered around 190 ° C and 320 ° C after irradiation with a {sup 90}Sr /{sup 90}Y source. Thermoluminescent properties such as linearity, reproducibility and fading were evaluated. The CaSO{sub 4}:Tm samples produced proved feasible for dosimetry purposes. (author)

  14. The importance of using the dosimeter in medical professionals in the hemodynamic service; A importancia do uso do dosimetro nos profissionais medicos no servico de hemodinamica

    Energy Technology Data Exchange (ETDEWEB)

    Melo, Francisca A. de; Victor Filho, Edgard, E-mail: francissamello@yahoo.com.br, E-mail: edgardvf@hotmail.com [Hospital das Clinicas do Recife (HCR/UFPE), PE (Brazil); Silva, Carla V. da; Santos, Tayline T. dos, E-mail: carla_vieira85@hotmail.com, E-mail: taylinetyene@hotmail.com [Instituto Federal de Educacao, Ciencia e Tecnologia de Pernambuco (IFPE), Recife, PE (Brazil); Guerra, Decio C., E-mail: decio.cavalcanti@yahoo.com.br [Universidade Federal de Sergipe (UFS), Lagarto, SE (Brazil)

    2014-07-01

    The objective of this study is to evaluate the medical exposure to ionizing radiation of X type in a interventional radiology service, of an university hospital, making a correlation with the importance of using dosimeters for monitoring the effective dose in individuals occupationally exposed (IOE). It was performed an analysis of radiation doses in two stages: the first there was not guidance on the need of using dosimeters; in the second time the professionals performed all procedures carrying the dosimeter. The result showed an average effective dose of professionals / year of 8.60 mSv at first moment, against a dose of 27.41 mSv in the second time after the routine of use the dosimeters, surpassing, in this second phase, the annual dose rate allowed by current radiation protection legislation, which calls for 20 mSv / year for professional. The comparison result in an increase of effective dose of professionals in nearly 300%. It is concluded that the implementation a continuing education project, including awareness of the importance in daily use dosimeter, shows up as a solution for optimizing the dose of these occupationally exposed individuals.

  15. Dose profile measurement in computerized axial tomography equipment using thermoluminescent dosemeters; Medicion del perfil de dosis en equipos de tomografia axial computarizada usando dosimetros termoluminiscentes

    Energy Technology Data Exchange (ETDEWEB)

    Azorin V, J.C.; Falcony, C.; Azorin N, J. [Centro de Investigacion en Ciencia y Tecnologia Avanzada, IPN, 07000 Mexico D.F. (Mexico)

    2000-07-01

    In this work are presented the results about measuring the radiation dose profile in two equipment of computerized axial tomography (Tac). Thermoluminescent dosemeters (Dtl) of LiF, Mg, Cu, P + Ptfe in form of disks were used which were developed and made in Mexico. The results showed that Dtl are appropriated for these type of studies. (Author)

  16. Comparison between the behavior of dosimeters FAM and FAT after irradiation with LED; Comparacao entre o comportamento dos dosimetros FAM e FAT apos irradiacao com LED

    Energy Technology Data Exchange (ETDEWEB)

    Almeida, M.G.O.; Lima, V.L.; Nascimento, R.K.; Souza, V.L.B., E-mail: vlsouza@cnen.gov.br [Centro Regional de Ciencias Nucleares do Nordeste (CRCN-NE/CNEN-PE), Recife, PE (Brazil). Divisao de Laboratorios Tecnico-Cientifico

    2013-08-15

    The work consists in evaluating the photosensitivity of Fricke solution modified by addition of dyes acting as a photosensitizers, comparing the behavior of FAM dosimeters (Fricke solution modified by addition of methylene blue) and FAT (Fricke solution modified by addition of toluidine blue) after irradiation with LED in acrylic phantom. An arrangement of LED, prepared for this purpose and a set of commercially available LED were used for irradiation the samples, as well as an acrylic phantom. The results show that the FAM is more sensitive dosimeter than FAT; samples irradiated with LED demonstrated the sensitivity of the dosimeters to red and blue light obtaining calibration curves with good correlation coefficients, so that these dosimeters may be used in the future for photodynamic therapy dosimetry. (author)

  17. Reproducibility study of thermoluminescent dosemeters for application in personal dosimetry; Estudo da reprodutibilidade de dosimetros termoluminescentes para a aplicacao em dosimetria pessoal

    Energy Technology Data Exchange (ETDEWEB)

    Medeiros, Beatriz M.; Morimoto, Richard; Menezes, Francisca L.; Ferri, Paulo L.S.; Santos, Osmar A. dos, E-mail: medeirosmbeatriz@gmail.com [Fundacao do Cancer, Rio de Janeiro, RJ (Brazil)

    2016-07-01

    Nowadays in radiotherapy services due to the big concern about the OEIs' safety is made the personal dosimetry of them. And Thermoluminescent Dosimetry is the most used dosimetric technique. It is necessary that the dosimeters are tested for their characterization and response evaluation before being used. One of these tests is the reproducibility test.This study aims to ensure that the dosimetric system analyzed has the same response to the same dose through the criteria presented by the Testing and Calibration Service Evaluation Committee - CASEC / IRD / CNEN contained in the IRD-RT Document Number 002.02 / 2010{sup o}. The groups showed a coefficient of variation equal to 3.6% for irradiated dosimeters with 25 cGy, 2.7% for irradiated dosimeters with 40 cGy, 6.6% for irradiated dosimeters with 50 cGy and 4.1% for dosimeters irradiated with 100 cGy. Since all these values are less than 7.5%, all four dosimeters groups would be accepted by the criteria used. (author)

  18. Measurement of effective dose in clinic radiation diagnosis with TL dosimeters developed in Mexico; Medicion de dosis efectiva en radiodiagnostico clinico con dosimetros TL desarrollados en Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez Martinez, Pedro R. [Instituto Nacional de Investigaciones Nucleares, Mexico, D.F. (Mexico); Azorin Nieto, Juan [Universidad Autonoma Metropolitana-Iztapalapa, Mexico D.F. (Mexico); Gonzalez Urquidi, Blanca [Universidad Veracruzana, Xalapa (Mexico); Maldonado Sanchez, Guadalupe [Instituto Mexicano del Seguro Social (IMSS), Toluca (Mexico). Hospital de Gineco Obstetricia

    2001-07-01

    At the moment the radiation diagnosis is one of the main causes of exposition to the ionizing radiations, and in many of the cases the limits to the limits of dose established by the Commission the International of Radiological safety are not applied. In this work the results obtained in the measurement of the effective dose with dosemeters Tl of LiF:Mg,Cu, P+PTFE developed in the National Institute of Nuclear Investigations (ININ), in patients to studies of clinical radiation diagnosis of urography and hysterosalpingography. The effective dose was considered in gonads, breasts and thyroid. Whereas in the radiologist physician the dose was measured in crystalline, thyroid and hands, in this work ware made whole body measurements in addition. The results showed that the dose received by patients is equivalent with the results reported in Literature; in the case of the radiologist physician, the dose considered in the made studies is below the limits recommended for POE.

  19. Development and characterization of ultra-thin dosemeters of aluminium oxide; Desarrollo y caracterizacion de dosimetros ultra-delgados de oxido de aluminio

    Energy Technology Data Exchange (ETDEWEB)

    Villagran V, E

    2003-07-01

    The aim of the present thesis work has been to investigate the thermoluminescent (Tl) response of aluminium oxide thin films with thicknesses of the order of 300 nm prepared by laser ablation. Aluminium oxide thin films show Tl response after they are subject to ultraviolet, beta and gamma radiation. The Tl curves exhibit peaks around 75 C and 169 C for UV radiation, 112 C and 180 C for beta particles and 110 C and 176 C for gamma radiation. In order to improve the Tl response some growth parameters such as power density and distance target-substrate were varied. The relation dose-response shows a non-linear behavior for UV irradiation; a linear behavior for beta-particles dose from 150 mGy to 50 Gy, and a linear behavior for gamma radiation dose from 5 Gy to 100 Gy. The kinetic Tl parameters were determined by Computerized Glow Curve Deconvolution (CGCD) method as well as using analytical methods. The CGCD results show that the high temperature peak is composed by four peaks with maximums in 165.7, 188.1, 215.3, 246.5 C. These obey a second order kinetics. The trap depth (E) values are 1.4, 1.6, 1.8 and 2.0 eV respectively. The different analytical results show a trap depth values of 0.914, 0.82 and 0.656 eV respectively. Oxide aluminium thin films obtained would be a suitable tool owing to their potential applications in clinical dosimetry, in the dose distributions due to weekly penetrating radiation determination, and in interfaces dosimetry. (Author)

  20. Characteristic parameters analysis on diagnostic X-ray beams for dosemeter calibration; Analise de parametros caracteristicos de feixes de raios-X diagnostico para calibracao de dosimetros

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Paulo Marcio Campos de

    2008-07-01

    Ionizing radiation metrology is the base to achieve reliable dose measurements in ali areas; it is also part of the framework that is established to assure radiation protection procedures in order to avoid or minimize the harmful biological effect that may be caused by ionizing radiation. A well done metrology means the use of reliable instruments that comply with standard performance requirements worldwide accepted. Those instruments are expected to be calibrated by Metrology Laboratories under well defined conditions. The International Electrotechnical Commission (IEC) in Standard 61267 established the reference radiations for medical diagnostic x-ray equipment that are recommended to be used for calibrating dosimetric systems for diagnostic dosimetry. In this work, X-ray beam qualities were established in a Calibration Laboratory and their characteristics were analyzed through the measurement of beam parameters like inherent tube filtration, beam uniformity and field size, energy spectra and peak voltage for additional filtration with 94.425 por cent and 99.999 por cent purity filters. Also, the first half-value layer and the homogeneity coefficient were measured for the three RQR 2, RQR 6 and RQR 10 IEC beam qualities and they were analyzed according to the IEC standard. Air-kerma measurements were carried out with an ionization chamber that had its reliability confirmed through repetition and reproducibility reading tests. In 50 sets of measurements the maximum standard deviation found of 10 successive readings was 0.19 %; the maximum shift of the reading mean value at a fixed geometry condition was 0.80 % with an overall standard deviation of 0.23 %. Results showed that the use of different purity filters did not cause a relevant influence on the beam energy spectra. An ionization chamber was also calibrated against a standard dosimeter in ali implemented reference radiations and the relevant sources of uncertainties were estimated. Calibration could be done with an expanded uncertainty of 1.50% for a coverage factor of 2 at a 95.45 % confidence level, mainly due to the uncertainty of 0.58% caused by the positioning set-up of the ionization chamber. (author)

  1. About the measurements systems with pen and thermoluminescent dosemeters; Sobre los sistemas de medicion con dosimetros de pluma y los termoluminiscentes

    Energy Technology Data Exchange (ETDEWEB)

    Cortes I, M.E.; Ramirez G, F.P. [Instituto Mexicano del Petroleo, Eje Central Lazaro Cardenas 152. 07730 Mexico D.F. (Mexico)

    1998-12-31

    In this work it is presented dosimetric data obtained with pen and thermoluminescent dosemeters, which are used by the Occupational Exposure Personnel (OEP) of the Mexican Petroleum Institute (IMP)(1). It was marked several great characteristics as for example, the differences among units which use one and another dosemeter type. Likewise, it is given to know diverse problems that were had in the IMP at relating the data obtained with these dosemeters (which utilizes OEP) and the ICRP 60 recommendations 1990. One of the most important difficulties is to satisfy the recommended limits by ICRP, particularly those that are referring to the units and their complex calculations. With respect to the unities, the ICRP makes reference at the concepts `dose equivalent` and `effective dose` with the sievert unit, that the General Regulations for Radiological Safety associates with `dose equivalent` and `effective dose equivalent`. It was illustrated the type of dosimetric statistics which are obtained with the TLD lectures and a OEP pen dosemeter during 1997. (Author)

  2. Thermoluminescent Dosimetry: A Preliminary Study for microCT Applications

    International Nuclear Information System (INIS)

    Montano Garcia, C.; Rodriguez-Villafuerte, M.; Martinez-Davalos, A.; Brandan, M. E.; Ruiz-Trejo, C.

    2006-01-01

    Preliminary measurements for microCT dosimetry are reported in this work, using TLD-100 crystals (1x1x1 mm3) within a solid water phantom specially designed with approximate dimensions of a mouse. A dose dependence as a function of radial distance and position along the axis of the phantom was found. Because of the smaller doses used in this work we can say that it is feasible to perform dosimetry measurements with high accuracy using TLD-100 microcubes

  3. Detection of irradiated foods by the thermoluminescence. Relationships between the temperature ranges of integrating TL glow curves and TL glow ratios

    International Nuclear Information System (INIS)

    Sekiguchi, Masayuki; Yamazaki, Masao; Goto, Michiko; Todoriki, Setsuko; Hagiwara, Shoji

    2007-01-01

    Our study demonstrated that the effects of the several temperature ranges for integrating TL glow intensity on the TL glow ratios by using spice-set purchased at a Turkish air port. The spice set had no labeling of irradiation feeds, but nine of 12 spices were judged as irradiated food in this study. Those temperature ranges were defined by evaluating the glow curves of irradiated TLD-100 chip (167-230degC), TLD-100 disc (177-238degC) and Dolomite element (145-258degC). Those are relatively stable and the difference of typical glow peak temperatures of TLD-100 disc in two institutes was less than 2%. On the other hand, those of TLD-100 tip was shift to higher temperature side at about 4degC because of declining of thermal conductance. The temperature ranges defined by TLD-100 were showed that discriminate more clearly between irradiated and nonirradiated spices compared with the full temperature range of TL measurement (70-400degC). With the exception of low glow intensity, background measurement for estimating net glow intensity was not necessary because TL glow ratio was hardly influenced whether the background measured or not. (author)

  4. Los entornos personales de aprendizaje (PLE. Del cómo enseñar al cómo aprender

    Directory of Open Access Journals (Sweden)

    Almudena Martínez Gimeno

    2013-01-01

    Full Text Available Si algo caracteriza el contexto social actual, es el profundo desarrollo de las tecnologías de la información y la comunicación. Nunca antes se ha contado con tal variedad de recursos cuyo uso didáctico nos ayuda no sólo a enseñar, sino también y primordialmente, a aprender en cualquier momento de la vida. Frente a la necesidad de atender la demanda de un alumnado que cada vez tiene a su alcance un mayor número de recursos y fuentes de información, hemos encontrado en los PLE (Personal Learning Environment un aporte elemental para la construcción de aprendizajes significativos. Pero tal y como exponemos a lo largo de este artículo, el profesorado tiene la responsabilidad de ajustar, a nuevas formas de aprender, nuevas formas de enseñar. Ya no es suficiente con incorporar elementos al aula, debemos adaptar la metodología a contextos de aprendizaje que no se encuentran bajo la supervisión del docente. Con esta visión se plantea la siguiente reflexión, cuyo objeto es aportar ideas que faciliten la integración de aspectos tecnológicos y pedagógicos en un entorno flexible de colaboración e intercambio, desde una acción regulada ya no por el profesorado, sino por el propio estudiante.

  5. Influencia de factores personales, profesionales y transnacionales en el síndrome de burnout en personal sanitario hispanoamericano y español (2007

    Directory of Open Access Journals (Sweden)

    Armand Grau

    2009-01-01

    y Nutrición tuvieron cifras inferiores al 6%. Entre los médicos el burnout predominaba en los que trabajaban en urgencias (17% e internistas (15,5%, mientras que anestesistas y dermatólogos tuvieron las prevalencias más bajas (5% y 5,3% respectivamente. Fueron variables protectoras la mayor edad (OR=0,96, tener hijos (OR=0,93, la percepción de sentirse valorado (OR=0,53, el optimismo (OR=0,80, la satisfacción profesional (OR=0,80 y la valoración económica (OR=0,91. Conclusiones: La prevalencia del burnout es mayor en España y Argentina y los profesionales que más lo padecen son los médicos. La edad, tener hijos, la percepción de sentirse valorado, el optimismo, la satisfacción laboral y la valoración económica, son variables protectoras de burnout.

  6. Modelo de diseño instruccional semipresencial basado en proyectos a partir de un LMS y PLEs - Integrando ambientes organizacionales y personales

    Directory of Open Access Journals (Sweden)

    Joel Ricardo Jiménez Cruz

    2014-01-01

    Full Text Available En este artículo se describe un modelo de diseño instruccional de un curso híbrido apoyado en la teoría del aprendizaje por proyectos o tareas. El modelo se estructuró con base en sesiones presenciales y virtuales, enmarcado en una visión conectivista que contiene dos núcleos de organización; un medio ambiente de aprendizaje personal (PLE, con base en un blog, desde donde cada uno de los alumnos gestiona su información respecto al avance del curso y el otro, un núcleo de enseñanza; un sistema de gestión del aprendizaje (LMS en Moodle que utiliza el profesor para dirigir y orientar la organización y desarrollo del curso. Se comentan los aspectos metodológicos, tecno-pedagógicos y sociales que se relacionan e integran en los dos núcleos de organización. Como caso de estudio se expone el desenvolvimiento de un curso en el cual se construye un sistema de información web para un proyecto social. El proyecto pretende mejorar una situación sociocultural problemática de la comunidad donde cada alumno vive. El sistema de información se construye con la finalidad de facilitar la difusión de información, los avances en los objetivos señalados y el aumento en la conciencia de la problemática específica social o cultural que se afronta y de las medidas que se podrían tomar para resarcir esa problemática. En el desarrollo del curso se aprecian las evidencias y tendencias de las affordances del modelo que se propone para cursos semipresenciales.

  7. Le rocce scolpite di Dazu - Chongqing, Cina: una valutazione critica dei problemi conservativi di un sito del patrimonio mondiale ed una esperienza personale

    Directory of Open Access Journals (Sweden)

    Ernesto Borrelli

    2015-08-01

    Full Text Available Abstract The Dazu Rock Carvings are located in Sichuan province (Chongqing municipality: a sites on the World Heritage List whose majestic rock carvings are of great religious and historical significance. They constitutes one of the most diverse forms of cultural heritage particularly present in China as the Yungang Grottoes , the rock carvings of Longmen and all represent one of the most demanding challenges for their conservation. This paper offer a critical appraisal of the conservation problems of the site, it would be a review on the past and current action to preserve the site, on the scientific research, and on the environmental and geotechnical aspects of conservation. The main feature of this article is scientific, but it is rather the story of a professional fascinating experience of a Western observer and conservationist approaching the Chinese cultural heritage. The paper includes an updated survey of the literature including an unusual use of repeated citations of a nice old book "The Chinese diary" of the Italian art historian Cesare Brandi, worldwide known as the author of the “Theory of Restoration” and founder (1939 of the Italian Institute for Conservation and Restoration of Cultural Heritage.

  8. Aspectos de literacidad digital en el desarrollo de los Entornos Personales de Aprendizaje (PLE) en el área de Lengua y Literatura

    OpenAIRE

    Rovira-Collado, José; Hernández Ortega, José

    2016-01-01

    Los procesos de práctica, adquisición y consolidación del conocimiento lingüístico-literario han sufrido una metamorfosis contextual tanto en su metodología como en el uso de herramientas vehiculares en la última década. Leer se ha convertido en un acto literario que suscita una reinterpretación multimodal por parte de un alumnado cuyas necesidades lectoescritoras atienden a una pluralidad significativa de formatos, estilos y medios de difusión. Youtubers reconvertidos a Booktubers, lectura e...

  9. Salud/Servicios Personales. Libro del Profesor. (Health/Personal Services. Teacher's Guide). B2. CHOICE (Challenging Options in Career Education).

    Science.gov (United States)

    Mid-Hudson Migrant Education Center, New Paltz, NY.

    Written in Spanish, the guide comprises the first grade unit of a career education curriculum developed for migrant students. The guide covers 12 health and personal service occupations--blacksmith, television repairer, hairdresser/barber, day care worker, waitress, gas station attendant, family doctor, ambulance driver/attendant, dietician,…

  10. Redes personales de africanos y latinoamericanos en Cataluña, España. Análisis reticular de integración y cambio.

    Directory of Open Access Journals (Sweden)

    Ávila Molero, Javier

    2008-12-01

    Full Text Available This paper analyzes, in comparative way, the personal networks of Argentinian, Dominican, Moroccan and Senegambian immigrants in Catalonia, Spain. The main objetive is to analyze relations structure and composition, and their relatios with the process of insertion of the immigrants in the destination society. This is possible by the development of new indicator. In the same way, this paper it also analyzes the strong processes of change in the structure and composition of the personal networks of the immigrants

  11. Las pasantías de la Universidad de la República frente a las contribuciones especiales de seguridad social y el impuesto a las retribuciones personales

    OpenAIRE

    Andrés Blanco

    2014-01-01

    El régimen de pasantías de la Universidad de la República se encuentra regulado por la "Ordenanza de pasantías" aprobada por resolución del Consejo Directivo Central (CDC) del 22 de agosto de 2000.Dicho régimen, así como las pasantías en general del sector público y privado, ha generado una serie de problemas jurídicos que moti varan diversos pronunciamientos doctrinarios y administrativos. En esta ocasión nos ocuparemos de uno de dichos problemas, cual es la situación de dichas pasantías fre...

  12. Rischio stress tra il personale degli asili nido/scuole dell'infanzia della Municipalità di Venezia e Marghera

    DEFF Research Database (Denmark)

    Camerino, Donatella; Fichera, G P; Punzi, Silvia

    2011-01-01

    Based on an investigation on organizational well-being in the Municipality of Venice (2009), we examined 110 public nursery school and preschool teachers working in the Venice and Marghera districts.......Based on an investigation on organizational well-being in the Municipality of Venice (2009), we examined 110 public nursery school and preschool teachers working in the Venice and Marghera districts....

  13. La autoría y la acreditación de la identidad en los trabajos personales en Educación a Distancia. Una experiencia

    Directory of Open Access Journals (Sweden)

    Miguel Zapata Ros

    2004-01-01

    Full Text Available How can works and individual learnings be valued in distance learning? And, after all, how can we promote a distance learning student by giving grades and degrees? There is no doubt that a thesis or research piece plus a many-yearlong process of elaboration in which tens or hundreds of messages are written and exchanged between a student and their tutors offer enough validation elements to evaluate if goals have been met. However, there is an extra added issue of vital importance that crops up before a personal piece of work to consider in the end: how do we know if the real author is the one who claims to be so? The same doubt that originated Steiner’s vignette in the New Yorker1, in which a dog can be seen before a computer keyboard saying, “On the Internet, nobody knows you’re a dog”, is cast again. Undoubtedly, an essential worry for several basic issues underlies this anxiety: Can a learning program be wholly at a distance? What is the academic or professional guarantee given to those degrees? And what is most, which is their social credibility? This paper approaches the problem of authorship and acknowledgement of identity in personal pieces of work done in distance learning. Besides, this work describes and experience on the area and offers a reflexion on the topic.

  14. ICT Competences of teachers. Influence of personal and contextual factors [Las competencias en TIC del profesorado. Influencia de factores personales y contextuales

    Directory of Open Access Journals (Sweden)

    Jesús Suárez Rodríguez

    2012-03-01

    Full Text Available The ICT competences of teachers remain a crucial issue for educational development. This work aims to establish a framework to specify the relations of the two elements of competence (technological and pedagogical and analyze the influence of key personal and contextual factors. The data were collected from a questionnaire in a sample of 868 teachers from primary and secondary education in Comunidad Valenciana (Spain. The results show the importance of a multivariate approach to assess the complexity of the problem. They provide an overview of the influences of different personal and contextual factors that go beyond the many contributions based on univariate approaches. This is very relevant to the development of education policies for both programs for endowments as those aimed at teacher training.

  15. Género y actitudes ante las TIC: estudio de la influencia del uso de ordenadores personales en los centros escolares

    OpenAIRE

    Cussó Calabuig, Roser

    2014-01-01

    El uso de las TIC en la educación y los cambios metodológicos asociados son uno de los ejes fundamentales de los sistemas educativos actuales. La necesidad de asegurar que todos los ciudadanos asuman un nivel aceptable de competencia digital es imprescindible en una sociedad donde las TIC están presentes en todos los ámbitos. Si la competencia digital es, por tanto, una de las competencias fundamentales de los ciudadanos del siglo XXI, es preciso estudiar las posibles causas que provocan l...

  16. Relacionamentos pessoais e sociais: amizade em adultos Relacionamientos personales y sociales: amistad en adultos Personal and social relationships: friendship in adults

    Directory of Open Access Journals (Sweden)

    Luciana Karine de Souza

    2008-06-01

    Full Text Available A amizade é um relacionamento importante para o desenvolvimento social, emocional e cognitivo; no entanto a maioria dos estudos trata da amizade na infância e na adolescência, havendo pouca ênfase na investigação de adultos. O presente trabalho apresenta uma revisão da literatura sobre relacionamentos de amizade na adultez, procurando descrever criticamente a produção científica na área. Estudos brasileiros indicam que relacionamentos de amizade no nosso país podem ser comparados aos de outras culturas e discutidos com base nos modelos teóricos existentes. Não obstante, há algumas diferenças que requerem mais estudo, inclusive para verificar se os modelos internacionais correntes são satisfatórios para explicar adequadamente relações de amizade entre adultos na cultura brasileira.La amistad es un relacionamiento importante para el desarrollo social, emocional y cognitivo, pero la mayor parte de los estudios trata de la amistad en la niñez y en la adolescencia, habiendo poca énfasis en la investigación con adultos. El estudio en cuestión presenta una revisión de la literatura sobre relacionamentos de amistad en la edad adulta, buscando describir críticamente la producción científica en el área. Estudios brasileños indican que relacionamientos de amistad en ese país pueden ser comparados a los de otras culturas y discutidos en base a los modelos teóricos existentes. Sin embargo, hay algunas diferencias que requieren más estudio incluso para averiguar si los modelos internacionales actuales son satisfactorios para explicar adecuadamente relaciones de amistad entre adultos en la cultura brasileña.Friendship is an important relationship for social, emotional and cognitive development. However, most empirical studies investigate friendship in childhood and adolescence, with little emphasis in adulthood. Current analysis presents a critical review of the literature on friendship among adults, describing the major empirical studies undertaken up to the present. Brazilian studies suggest that friendship among Brazilians might be similar to friendship in other cultures and that international theoretical models may be useful to describe it. Nevertheless, there may be some differences that require further investigation to assess if current models may explain satisfactorily friendship in Brazilian culture.

  17. Población estudiantil de la Universidad de Costa Rica: características socio-personales e intereses en torno a su desarrollo personal

    OpenAIRE

    Molina Rojas, Noilin

    2015-01-01

    El presente artículo presenta los resultados de una caracterización socio-personal de la población estudiantil de la Sede Rodrigo Facio de la Universidad de Costa Rica. El estudio partió de un modelo mixto de investigación, en el que se aplicaron 1237 cuestionarios, en un marco muestral de 14.635 estudiantes y se desarrollaron seis grupos focales, uno por cada área académica de la Sede. Los resultados indican que la mayoría de los y las estudiantes de la Sede cuenta con condiciones y caracter...

  18. Loan to Own. FDIC Money Smart Financial Education Curriculum = Prestamos Personales. FDIC Money Smart Plan de Educacion para Capacitacion en Finanzas.

    Science.gov (United States)

    Federal Deposit Insurance Corp., Washington, DC.

    This module on knowing what one is borrowing before buying is one of ten in the Money Smart curriculum, and includes an instructor guide and a take-home guide. It was developed to help adults outside the financial mainstream enhance their money skills and create positive banking relationships. It is designed to familiarize participants with the…

  19. Felicidad, cultura y valores personales: estado de la cuestión y síntesis meta-analítica

    Directory of Open Access Journals (Sweden)

    María Ángeles Bilbao

    2007-12-01

    Full Text Available Este estudio presenta un meta-análisis sobre la relación entre los valores de Schwartz y el bienestar subjetivo en distintos contextos culturales, con estudiantes, sus familiares e inmigrantes en España. Los resultados confirman una asociación significativa entre los valores y el bienestar. Auto trascendencia y apertura al cambio, y con menor intensidad, conservación, se asocian positivamente con mayor bienestar. Auto trascendencia se asocia con felicidad y satisfacción de forma positiva no homogénea, siendo los inmigrantes quienes presentan medias más bajas. Apertura al cambio se asocia con felicidad, siendo más fuerte la asociación en inmigrantes que en estudiantes. Los valores conservacionistas se asocian homogéneamente. Un segundo estudio sobre criterios de salud psicosocial y bienestar subjetivo -analizando un país sudamericano colectivista y jerárquico como Brasil, y otro europeo más individualista e igualitario como España- confirma que los valores conservacionistas, así como los de aperturaal cambio y auto trascendencia, son deseables y favorecen el bienestar. -- This article presents a meta-analysis of the relationship between Schwartz personal values and subjective well-being among different cultural contexts, with students, their families, and immigrants in Spain. Results show a significant association between personal values and well-being. Self-transcendence and openness to change, as well as conservation, but with less intensity, are positively associated with greater well-being. Self-transcendence is non-homogenous and positively associated with both happiness and satisfaction, being the immigrants who present lower levels. Openness to change is associated with happiness, being this relationship stronger for immigrants than for students. Conservation values are homogenously associated with subjective well-being. A second study about psychosocial health and subjective well-being analyzes two countries: a collectivist and hierarchical South American country as Brazil, and another one more individualistic and egalitarian as Spain. Results corroborate that conservation values, as well as openness to change and self-transcendence, are desirable and beneficial for subjective well-being.

  20. Condicionamientos internos en la variación de los pronombres personales átonos en Los hechos de Don Miguel Lucas de Iranzo

    Directory of Open Access Journals (Sweden)

    Francisco Díaz Montesinos

    2004-06-01

    Full Text Available The aim of this paper is to analyse the linguistic factors constraining the use of personal clitics lo(s, la(s, le(s in XVth Century Middle-Age Castilian, as revealed in the Relación de los Hechos de Don Miguel Lucas de Iranzo (1458. A multivariate analysis of data from this text shows that internal (morphological, syntactic, lexical and textual factors interact and allows us to imagine the simplest and original context where leísmo could start. A nearly categorical tendency to employ le for male referents as direct objects is developed with human antecedents and where Latin used dative case or alternated between dative and accusative case. If Latin used accusative case, occurrence of le (leísmo depends on a set of linguistic constraints whose effect is systematic and predictable, as shows a logistic regression analysis carried out in this paper. Use of le (leísmo for human antecedents is constrained by the following internal factors: etymology, the number and the clitic's position within the sentence, type of syntactic structure and the verb's tense.

  1. El método biográfico en investigación social: potencialidades y limitaciones de las fuentes orales y los documentos personales

    Directory of Open Access Journals (Sweden)

    Sanz Hernández, Alexia

    2005-06-01

    Full Text Available The biographical reconstruction is a game of intersubjectivities that emerges essentially from the person and her testimony, either oral or written. Memory, identity and sociability are also devices from which there are to understand the potentialities and limitations of the oral and material documents of life, sources on which the biographical investigation is based. This paper is a didactic essay about how to make it.

    La reconstrucción biográfica es un juego de intersubjetividades que emerge esencialmente de la persona y de su testimonio, ya sea oral u escrito. Memoria, identidad y sociabilidad son igualmente dispositivos desde los cuales hay que entender las potencialidades y limitaciones de los documentos orales y materiales de vida, fuentes sobre las que se fundamenta la investigación biográfica. El trabajo muestra, de un modo práctico o didáctico, cómo orientarse en este proceso.

  2. Influencia de las actividades lúdicas grupales en la calidad de la lectura y en las relaciones personales de los alumnos de educación primaria

    OpenAIRE

    Teresita Reyes León; Beatriz Arrieta de Meza

    2014-01-01

    La lectura es un proceso donde el lector construye el significado utilizando los conocimientos previos del tema, las pistas que éste le ofrece, las estrategias y operaciones mentales que se ponen en marcha al leer, tornándose una actividad placentera si se realiza a través del juego. Así, en base a las ideas de Piaget (1986), Kohlberg y Turiel (1981), Martí (1975), Montenegro y Guajardo (1994), se expone acerca del juego, la lectura y la comunicación interpersonal en los alumnos/as de Educaci...

  3. Rischio stress tra il personale degli asili nido/scuole dell'infanzia della Municipalità di Venezia e Marghera

    DEFF Research Database (Denmark)

    Camerino, Donatella; Fichera, G P; Punzi, Silvia

    2011-01-01

    Based on an investigation on organizational well-being in the Municipality of Venice (2009), we examined 110 public nursery school and preschool teachers working in the Venice and Marghera districts....

  4. Relación entre el fenómeno de la ilusión de la mano falsa y variables personales

    Directory of Open Access Journals (Sweden)

    Gina Rodríguez-Melgarejo

    2015-07-01

    Full Text Available El fenómeno de la ilusión de la mano falsa (IMF se ha propuesto como un diseño que permite discriminar procesos perceptuales a partir de entradas sensoriales multimodales. Se han reportado varias modificaciones y variables que podrían afectar la generación del fenómeno. Este estudio se planteó bajo un diseño descriptivo-correlacional del fenómeno. Se realizó el procedimiento en jóvenes (16-48 años M = 20.86 años, DE = 4.4 colombianos para replicar el fenómeno de IMF. Los sujetos se dividieron al azar en dos grupos que diferían en el tipo de estimulación (sincrónica y desincronizada. La identificación de la IMF se realizó mediante la escala reportada en múltiples estudios, mostrando que en algunas variables como la estimulación se presentaba una diferencia en el reporte de IMF (P2. χ2 = 5.856: p < 0.05; P3. χ2 = 6.655: p < 0.01 y P7 (χ2 = 4.764: p < 0.05. Otras variables como sexo y dominancia manual mostraron algunas diferencias. La escala presenta una consistencia interna aceptable (α = 0.8. Los resultados de la IMF son similares a algunos estudios pero con puntuaciones menores que en los estudios iniciales, la diferencia en cuanto al género en tareas perceptuales podría explicar gran parte de los resultados.

  5. El estudio de las redes personales para la implementación de estrategias de atención sociomédica.

    OpenAIRE

    Terán Trillo, Margarita

    2009-01-01

    Este estudio comparativo entre enfermos geriátricos sin problema cognitivo y cuidadores de pacientes con demencia, detectó diferencias importantes en la integración social (2.72 y 1.71 respectivamente) y número de personas en su red (7.60 y 3.95); estableciendo las bases para generar estrategias de atención que incrementen sus redes e influir en una mayor calidad de vida. This comparative study between patients geriatric’s without cognitive problem and Care taker of patient with dementia, ...

  6. El estudio de las redes personales para la implementación de estrategias de atención sociomédica.

    Directory of Open Access Journals (Sweden)

    Terán Trillo, Margarita

    2009-12-01

    Full Text Available This comparative study between patients geriatric’s without cognitive problem and Care taker of patient with dementia, detected important differences in the social integration (2.72 and 1.71 respectively and number of people in his net (7.60 and 3.95; Establishing the bases to generate strategies of attention that increase his nets and to have an influence on main quality of life.

  7. Apoyo a la Unión Europea y difusión de una identidad europea a través de las redes personales

    Directory of Open Access Journals (Sweden)

    García Faroldi, Livia

    2004-10-01

    Full Text Available This research tests the hypothesis that attitudes towards the European Union as well as the degree of identification to the EU tends to be reinforced or weakened within personal networks. European identity is considered as an innovation that spreads (or not through personal networks. This innovation is considered as socially prestigious and, because of that, it is adopted in first place by those who are opinion leaders in their network. Using Merton’s distinction between “locals” and “cosmopolitans” leaders, it is supposed that these influents have a more cosmopolitan profile than the other members of their network. Indeed, it is assumed that people who are more familiar with the European project exert an important influence in their network because they are considered “experts”. Finally, it is tested if people who occupy bridge positions between local and cosmopolitan parts of the network promote the diffusion of information about European Union (attitudes, opinions and an identity towards weak ties.

  8. Consecuencias profesionales y personales de la depuración franquista en el profesorado normalista: el caso andaluz (1936-1941

    Directory of Open Access Journals (Sweden)

    Francisco Martín Zúñiga

    2015-07-01

    Full Text Available En este trabajo nos centramos en el estudio de la incidencia que tiene la depuración franquista en el caso concreto del profesorado de las Escuelas Normales de Magisterio Primario de Andalucía. Nuestro propósito no es sólo el de efectuar una interpretación de los datos cuantitativos, sino que prestamos especial atención a la incidencia que esta acción represiva tiene en su vida personal y profesional.En la búsqueda de las fuentes documentales nos hemos encontrado con la dificultad de que los expedientes de depuración del profesorado normalista no se encuentran en el Archivo General de la Administración (AGA, lugar donde legalmente deben estar depositados. Esto nos ha obligado a la localización e interpretación de otras fuentes, como las publicadas en los Boletines Oficiales del Estado y las Provincias y las depositadas en los archivos Históricos de las universidades de Málaga, Granada y Sevilla, dado que son los rectores los responsables de tramitar la documentación generada por el proceso de depuración.Respecto a las conclusiones, en las Escuelas Normales el número de profesoras y profesores es paritario y, sin embargo, la proporción de sancionadas es muy baja, incluso inferior a la de sus compañeras de instituto cuya platilla es mínima, mientras que más del 34 % de los profesores son represaliados, como es habitual, por razones políticas, siendo especialmente duros con aquellos comprometidos activamente con la política republicana (alcaldes, concejales, diputados, directores generales de enseñanza…. De todos modos, no hay unas diferencias muy significativas con la depuración de otros estamentos docentes.  

  9. El personal branding en las redes sociales: un estudio sobre la creación de marcas personales en el alumnado de Grado de Publicidad y Relaciones Públicas

    OpenAIRE

    Noceda Casado, Judith

    2015-01-01

    En este trabajo se realiza una aproximación de los conceptos de personal branding y redes sociales ya que creo que hoy en día no se puede hablar del uno sin el otro. Se podría decir que es un intento de ir un poco más allá y profundizar en la combinación de los mismos desde el ámbito teórico hasta el más analítico. Los resultados de una investigación realizada mediante un cuestionario a los estudiantes de cuarto curso del Grado de Publicidad y Relaciones Públicas de la Universidad de Valladol...

  10. Diseño de un programa de evaluación e intervención de variables emocionales, conductuales y personales para personal de emergencias

    OpenAIRE

    Pujadas Sánchez, María Dolores

    2016-01-01

    La actual organización geopolítica y económica ha configurado una situación laboral y social que implica una serie de riesgos para los trabajadores (Sennett, 2000, 2001, 2006, 2009, 2011) derivados de un contexto global, de la presión e inestabilidad laboral y de las exigencias de la tarea, a los que la Organización Internacional del Trabajo (OIT) ha clasificado como riesgo psicosocial. Simultáneamente, la Organización Mundial de la Salud (OMS) ha manifestado que las nuevas enfermedades pr...

  11. Influence of personal values of the entrepreneur in organizational culture; Influencia de los valores personales de la emprendedora en la cultura organizativa

    Energy Technology Data Exchange (ETDEWEB)

    Campos, A.; Hormiga, E.; Valls, J.

    2012-11-01

    This study analyzes the case of the company Adiciona and its female founder under the perspective of personal values and their influence on corporate values. The case shows how her collectivist values, most notably its commitment to gender equality, have influenced the definition of competitive strategy. The interest of this case lies in the clear definition and defense of corporate values as a strategy for long-term success. (Author) 24 refs.

  12. Dose evaluation in occupationally exposed workers through dosimeters ring and wrist type with an anthropomorphic phantom; Evaluacion de la dosis en trabajadores ocupacionalmente expuestos a traves de dosimetros tipo anillo y de muneca con un fantoma antropomorfico

    Energy Technology Data Exchange (ETDEWEB)

    Palma, R.; Gastelo, E. [Univesidad Nacional Pedro Ruiz Gallo, Huamachuco, Lambayeque (Peru); Paucar, R.; Tolentino, D.; Herrera, J. [Complejo Hospitalario San Pablo, Lima (Peru); Armas, D., E-mail: fispalma@hotmail.com [Consorcio Proxtronics del Pacifico S. A. C., Cal. Manuela Estacio Mza. D1-2 Lote 13, San Miguel, Lima (Peru)

    2014-08-15

    In the Nuclear Medicine service of the Clinica San Pablo (Peru), the occupationally exposed workers carried out the preparation and administration of radiopharmaceuticals to patients, so it is vital to measure the equivalent dose to the hands during the procedures in order to optimize the exposure to the ionizing radiation and execute the Radiological Safety Regulation (D.S. No. 009-97-Em) and the standard IR 002.2012 of radiation protection and safety in nuclear medicine. In this paper was designed and built a hand anthropomorphic phantom made of paraffin following the description given for the standard man, later were placed dosimeters ring and wrist type UD-807 model, Panasonic brand. Then we proceeded to irradiate using vial containers of Tc-99 and I-131. The obtained results showed the difference between the equivalent dose obtained among the ring and wrist dosimeter also getting a dose of 153 mSv /year when working with {sup 99m}Tc and of 61 mSv /year when working with iodine-131. Was also demonstrated that the ring dosimeter shows the average dose received in the hand with less dispersion. It was found that under the national regulation on Requirements of Radiation Protection and Nuclear Safety in Medicine article 63, indicates that higher doses of 150 mSv /year the occupationally exposed workers should have hand dosimetry. Finally the individual dose limit of 500 mSv /year in extremities can be overcome if adequate radiation protection standards do not apply. (author)

  13. Clinical characterization of OSL dosimeters for use in dosimetry of teletherapy beams in conventional fractionation; Caracterizacion clinica de dosimetros OSL para su uso en dosimetria de haces de teleterapia en fraccionamiento convencional

    Energy Technology Data Exchange (ETDEWEB)

    Lopez V, A.; Gutierrez M, J. G.; Rivera M, T. [IPN, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Av. Legaria No. 694, Col. Irrigacion, 11500 Mexico D. F. (Mexico); Velazquez T, J. J., E-mail: jggm25@yahoo.com.mx [Centro Medico Nacional Siglo XXI, Hospital de Oncologia, Departamento de Fisica Medica, Av. Cuauhtemoc No. 330, Col. Doctores, 06720 Mexico D. F. (Mexico)

    2015-10-15

    Optically stimulated materials are increasingly used for dosimetry in clinical settings; to be sure of the obtained reading their proper clinical characterization is necessary. Is important to know the homogeneity of a batch, reproducibility, be exposed to the same conditions of irradiation repeatedly and other dependences that could present such as energy, angular, the type of radiation which are exposed and the dose deposited in them. For characterization they were designed and implemented tests for each of the factors of interest, taking into account the need for them (calculations, manufacture of mannequins, conditions, practicality, etc.) It was shown that we can apply this dosimetry in clinical practice within a radiotherapy center, relying on the readings and practicality. (Author)

  14. Thyroid dose measurement in patients undergoing to digital orthopantomography using optical stimulation dosimeters; Medicion de dosis en tiroides en pacientes sometidos a ortopantografia digital utilizando dosimetros de estimulacion optica

    Energy Technology Data Exchange (ETDEWEB)

    Gutierrez M, J. G.; Lopez V, A.; Rivera M, T. [IPN, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Unidad Legaria, Calz. Legaria 694, Col. Irrigacion, 11500 Ciudad de Mexico (Mexico); Avalos P, L. Y., E-mail: jggm25@yahoo.com.mx [UNAM, Facultad de Odontologia, Ciudad Universitaria, 04510 Ciudad de Mexico (Mexico)

    2016-10-15

    In this paper we present the study of the thyroid equivalent dose in 300 patients undergoing to digital orthopantomography for dental treatment purposes using optical stimulation dosimeters (OSL) as in-vivo dosimeters, in order to verify if this is within acceptable parameters to prevent stochastic risks and to evaluate the possible risks caused by the technique used for this type of study (66 kv, 5 m A, 14.1 s). Three OSL dosimeters were used per patient, which were placed by the physician on the skin above the thyroid gland (using anatomical references and palpation); the information of the patients was divided by neck size and sex, finding a slight increase in the equivalent dose for female and small size patient, this combination being the group that was submitted to a higher dose. The results obtained were compared with similar studies performed on anthropomorphic mannequins with TLD dosimeters obtaining lower results. The equivalent dose found even though is below the threshold stochastic damage must be motorized for radiological protection and registration purposes. (Author)

  15. Simulation of ferric ions transfer in dosemeter Fricke-Xylenol-Gel in means no homogeneous; Simulacao da difusao de ions ferricos em dosimetros Fricke-Xilenol-Gel em meios nao homogeneos

    Energy Technology Data Exchange (ETDEWEB)

    Milani, Caio J.; Bevilacqua, Joyce da Silva, E-mail: caio.milani@usp.br, E-mail: joyce@ime.usp.br [Universidade de Sao Paulo (USP), SP (Brazil). Instituto de Matematica e Estatistica. Departamento de Matematica Aplicada; Cavinato, Christianne C.; Rodrigues Junior, Orlando; Campos, Leticia L., E-mail: rodrijr@ipen.br, E-mail: Icrodri@ipen.br, E-mail: ccavinato@ipen.br [Instituto de Pesquisas Energeticas e Nucleares (lPEN/CNEN-SP), Sao Paulo, SP (Brazil). Gerencia de Metrologia das Radiacoes

    2013-11-01

    Dosimetry in three dimensions using Fricke-Xilenol-Gel dosimeters (FXG) allows the confirmation and a better understanding of a treatment by Radiotherapy. The technique involves the assessment of the irradiated volumes by magnetic resonance imaging (MRI) or optical-CT. On both cases, the time elapsed between the irradiation and the measurement is an important factor in the quality of results. The quality of the images can be compromised by the mobility of the ferric ions (Fe{sup 3+}), formed during the the interaction of the radiation with the matter, increasing the uncertainty in the determination of the isodoses in the volume. In this work, the phenomenon of the diffusion of the ferric ions formed by an irradiated region is simulated in a bidimensional domain. The dynamic of the Fe{sup 3+} in Fricke-Gel is modeled by a parabolic partial differential equation and solved by the ADI-Peaceman-Rachford algorithm. Stability and consistency of the method guarantee the convergence of the numerical solution for a pre-defined error magnitude, based on choices for the discretization values of time and space. Homogeneous and non-homogeneous cases are presented considering an irradiated region and a physical barrier that prevents the movement of the ions, on the non-homogeneous case. Graphical visualizations of the phenomenon are presented for better understanding of the process. (author)

  16. Diffusion simulation of ferric ions in dosemeter Fricke-gel with variable diffusion coefficient; Simulacao da difusao de ions ferricos em dosimetros Fricke-gel com coeficiente de difusao variavel

    Energy Technology Data Exchange (ETDEWEB)

    Milani, Caio Jacob; Bevilacqua, Joyce da Silva, E-mail: caio.milani@usp.br, E-mail: joyce@ime.usp.br [Universidade de Sao Paulo (USP), Sao Paulo, SP (Brazil). Inst. de Matematica e Estatistica. Dept. de Matematica Aplicada; Rodrigues Junior, Orlando, E-mail: rodrijr@ipen.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil). Gerencia de Metrologia das Radiacoes

    2014-07-01

    Dosimetry using dosimeters Fricke-xylenol-Gel (FXG) allows confirmation and better understanding of radiotherapy treatments. The technique involves the evaluation of volumes irradiated by magnetic resonance imaging (MRI) or CT-optical. In both cases, the time spent between the irradiation and measurement is an important factor that directly influences the results. The quality of the images can be compromised by the mobility of ferric ions (Fe 3+), formed during the interaction of radiation with matter, increasing the uncertainty in determining the isodose. In this work, we simulated the dynamic involving ferric ions formed in one irradiated region irradiated in a two-dimensional domain with a variable diffusion coefficient. This phenomenon is modeled by a differential equation and solved numerically by an efficient algorithm that generalizes the Crank-Nicolson method. The stability and consistency of the method guarantee the convergence of the numerical solution for a predefined tolerance based in the choice of discretization steps of time and space. Different continuous functions were chosen to represent the diffusion coefficient and graphical views of the phenomenon are presented for a better understanding of the process.

  17. Implementation of a gel dosimeter for dosimetric verification of treatments with RapidArc{sup TM}; Implementacion de un dosimetro en gel para verificacion dosimetrica de tratamientos con RapidArc{sup TM}

    Energy Technology Data Exchange (ETDEWEB)

    Cortes, H.; Vasquez, J. [Centro de Control de Cancer Ltda., Carrera 16A No. 83 A-11, 110911 Bogota (Colombia); Plazas, M., E-mail: hhcortess@unal.edu.co [Universidad Nacional de Colombia, Av. Carrera 30 No. 45, 110911 Bogota (Colombia)

    2014-08-15

    The gel dosimetry represents advantages on other dosimetric systems for its potential of analyzing information in third dimension (3D). This work seeks to find another alternative for the verification of treatments of high complexity like the RapidArc{sup TM}. A gel type Magic was prepared and characterized, which was irradiated with base in a plan of RapidArc{sup TM} calculated in the Treatment Planning System (Tps) Eclipse, using the Anisotropic Analytic Algorithm (Aaa) for a beam with an acceleration potential of 6 MV. The dosimeter was characterized using Magnetic Resonance Images starting from the correlation between the T2 and the dose. The dose distribution curves were analyzed in second dimension (2D) using the program Omni Pro-I mrT and were compared with the curves obtained for the Tps under the approach gamma 2D. The comparison showed that the Gel represents a valid option inside the acceptable ranges for Quality Assurance in radiotherapy. (Author)

  18. Comparing of the yield curve of the pediatric X-ray equipment using thermoluminescent dosimeters and cylindrical ionization chamber; Comparacao da curva de rendimento de um aparelho de raios X pediatrico utilizando dosimetros termoluminescentes e camara de ionizacao cilindrica

    Energy Technology Data Exchange (ETDEWEB)

    Filipov, Danielle, E-mail: dfilipov@utfpr.edu.br [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil); Schelin, Hugo R., E-mail: ledesmaiorgealberto@gmail.com [Instituto de Pesquisa Pele Pequeno Principe, Curitiba, PR (Brazil); Tilly Junior, Joao G., E-mail: joao.tilly@derax.com.br [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil). Hospital de Clinicas

    2014-07-01

    The determination of the yield curve of a radiographic equipment should be realized once a year, or when the unit be serviced. Besides being a requirement of ANVISA, through this test is possible to determine the incident air kerma (at a given point in the center of the beam) - INAK. Based on these concepts, the main objective of this work is the comparison of yield curves of the pediatric X-ray apparatus using two different detectors: one cylindrical ionization chamber and thermoluminescent dosimeters type LiF: Mg, Cu, P, as per protocol RLA / 9/057 IAEA. Then the equation of the yield curve (generated by each detector) was used to determine the INAK of 10 pediatric examinations, performed on this equipment. After the process of calibration of both detectors, they were placed side by side at a focus of the tube equipment for determining the performance of the same curve. Finally, using the curves generated by two detectors, INAK values of the 10 tests were calculated (from the kVp values, and mAs focus-patient of each exams), generating difference values at most 5%. As a conclusion, it can be said that the TLD lithium fluoride doped with Mg, Cu and P and the cylindrical ionization chambers may be used satisfactorily to determine the yield curve, whether as quality control or dosimetry.

  19. Dosimetric characterization of the PTW Seven29 dosimeter and Octavius Phantom for IMRT quality control; Caracterizacao dosimetrica do dosimetro PTW Seven29 e Octavius Phantom para controle de qualidade em IMRT

    Energy Technology Data Exchange (ETDEWEB)

    Goncalves, Leandro R.; Habitzreuter, Angela B.; Santos, Gabriela R.; Watanabe, Erica Y.; Silva, Marco A.; Menegussi, Gisela; Rodrigues, Laura N.; Furnari, Laura, E-mail: leandrorg11@hotmail.com [Instituto do Cacer do Estado de Sao Paulo (ICESP), SP (Brazil). Servico de Radioterapia

    2012-12-15

    Techniques like IMRT, VMAT and tomotherapy has been used to improve dose conformity in the target, while sparing adjacent normal tissues. The complexity of this techniques challenge to correctly verify the dose delivery, in an independent way. Matrix detectors have been used for this purpose. Although, to exactly understand the dosimeter response and to identify his limitations, characterization measurements need to be performed. These dosimeters, for instance, can present angular dependence. Phantoms has been designed to, when used together the detector, eliminate this angular dependence. The aim of this work was to characterize PTW Seven 29 dosimeter and also his use with Octavius Phantom (PTW). The dosimeter showed reproducible with 0.25% the biggest standard deviation, good dose linearity and dose rate independence. Differences for output factors were obtained (<6%), but a clinical case measurement showed that the set can be used for IMRT verification. When used with Octavius Phantom the dosimeter showed low angular dependence. (author)

  20. Exposure levels to radiation in a nuclear medicine laboratory: measurements with thermoluminescence dosemeters; Niveles de exposicion a la radiacion en un laboratorio de medicina nuclear: mediciones con dosimetros de termoluminiscencia

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz J, A. [Departamento de Medicina Nuclear del Instituto nacional de Ciencias Medicas y Nutricion Salvador Zubiran, Vasco de Quiroga No. 15, Tlalpan 14000 Mexico D.F. (Mexico)

    2000-07-01

    Since 1996 in the Nuclear medicine Department and another routine and research departments of the National Institute of Medical and Nutrition Sciences (INCMNSZ) are working at least with 12 radioactive sources opened and sealed. However, it was unknown if with the Tl personal dosemeters with lithium fluoride crystals (LiF), could be possible to receive information about the equivalent dose for each radionuclide or if there was some radionuclide that by being low energy emissor or beta energy emissor, it did not represent an ionization power sufficient to excite the crystals of the thermoluminescent dosemeters (DTL). In this work the obtained results with control dosemeters of diverse source opened or sealed are shown, which were put at 1 cm of the LiF crystals during a time exposure 18 hours. Therefore the objective of this work is to verify which sources excite or not to DTL crystals and taking the pertinent safety measures for each radionuclide. The conclusion is that the majority of dosemeters were excited by beta or gamma radiation of the radionuclides and that LiF crystals are able to receive equivalent doses until 1200 mSv, being this a guarantee for the staff, that in an any moment could be exposed to high dose in his working day. Also it was corroborated that the radionuclides more energizer are: iodine-131, iodine-125 and sodium-22 while the phosphorus-32 must be managed with careful, since the exposure to hands can result significant, just like the technetium-99m ({sup 99m} Tc). (Author)

  1. The ferrous ammonium sulfate solid system, as dosemeter for processes at low temperatures and high doses of gamma radiation; El sistema sulfato ferroso amoniacal solido, como dosimetro para procesos a bajas temperaturas y altas dosis de radiacion gamma

    Energy Technology Data Exchange (ETDEWEB)

    Juarez C, J.M.; Ramos B, S.; Negron M, A. [ICN-UNAM, 04510 Mexico D.F. (Mexico)

    2005-07-01

    This paper presents the results obtained from a study of the radiation induced oxidation of crystalline ferrous ammonium sulfate with gamma rays at 295 K, 263 K and 77 K and dose from 0 to 300 kGy. The radiation induced decomposition of ferrous ammonium sulfate has been studied by the dissolution of the irradiated salt in 0,8 N sulfuric acid. The main product is Fe{sup 3+} and molar concentration of ferric ion was determined spectrophotometrically in the UV region at 304 nm. The optical density values showed a linear dependence with dose, indicating that the data obtained might be used to create a calibrating curve. Color in irradiated salt changes from blue to green, yellow and orange according to the absorbed dose. The accuracy and the reproducibility of the system were tested. In addition, some other characteristics make possible the use of this system as a dosimeter, similar to Fricke chemical dosemeter, at low temperatures and high dose. (Author)

  2. Statistical Review of surface dose in the period 1995-2010, measured by different types of TLD dosimeters; Revision estadistica de las dosis superficiales, en el periodo 1995-2010, medidas mediante distintos tipos de dosimetros TLD

    Energy Technology Data Exchange (ETDEWEB)

    Pastor Antolin, S.; Munoz Blasco, J.; Llansana Arnalot, J.; Gultresa Colomer, J.

    2011-07-01

    We analyzed the evolution of the number of special controls over the period 1985 to 2010 and the evolution of the doses in the period 1995 to 2010. Comparing the standard dose extremities respect to whole body in cases where users use both types of control in the same installation.

  3. Effect of some parameters in the response of the Perspex 3042, Lot L amber dosemeters; Efectos de algunos parametros en la respuesta de los dosimetros ambar Perspex 3042, Lote L

    Energy Technology Data Exchange (ETDEWEB)

    Prieto M, E.F.; Barrera G, G. [Centro de Aplicaciones Tecnologicas y Desarrollo Nuclear (CEADEN). Calle 30, No. 502, esq. 5ta. Avenida, Playa, Ciudad de La Habana (Cuba)]. e-mail: efprieto@ceaden.edu.cu

    2004-07-01

    The answer of the dosimetric systems is affected by several factors, for what should know as these factors they influence in each one of the different dosimetric systems and by this way to minimize its effect in the value of the absorbed dose and to obtain exact dose values. One of the dosimetric systems more used in the high dose dosimetry like routine dosemeter for the control of the irradiation process are the Perspex dosemeters, for their speed in the obtaining the information, their easy manipulation and the precision that they present. To this dosemeters group they belong the same as the Red and Clear the Amber, which are adequate for the measurement of the radiation dose in the range of high doses. The objective of the present work is to obtain the calibration curves of the dosemeters Amber Perspex 3042, Lot L under our work conditions, like they are the irradiation temperatures and of storage and to know the influence of the rate dose in the value of the absorbed dose for different measurement wavelengths, as well as, the relationship among the one post-irradiation time and the specific absorbance value induced in function of the absorbed dose. (Author)

  4. 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

    Energy Technology Data Exchange (ETDEWEB)

    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)

  5. 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)

  6. Evaluation of the implementation and use of active personal dosimeters for neutrons in Brazil; Evaluacion de la implementacion y del uso de los dosimetros individuales activos para neutrones en el Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Castro B, C. P.; Wagner P, W.; De Souza P, K. C., E-mail: karla@ird.gov.br [Instituto de Radioprotecao e Dosimetria, Av. Salvador Allende s/n, Recreio Bandeirantes, 22780-160 Rio de Janeiro (Brazil)

    2014-08-15

    This work was conducted through of a field research based on a questionnaire sent to users of active personal dosimeters. A retrospective study of the last six years was also carried out of the services in the Neutron Metrology Laboratory (2008-2013) referent to the active personal dosimeters, taking into consideration the standards ISO-8529-3 and IEC-61526. The active personal dosimeters are defined as any instrument of individual monitoring with direct reading capacity, used by individuals exposed to ionizing radiation fields. Through research was verified that the active personal dosimeters work associated with other dosimeter types. Considering all dosimeters declared in the questionnaire, only two dosimeters (MGP brand Dmc 2000-GN model and the brand ATOMTEX model AT2503A) have conformity declaration with the international standard IEC-61526: 2005 reported by the manufacturers. (author)

  7. Automation of dosimeters calibration for radiotherapy in secondary dosimetric calibration laboratory of the CPHR; Automatizacion de la calibracion de dosimetros de radioterapia en el laboratorio secundario de calibracion dosimetrica del CPHR

    Energy Technology Data Exchange (ETDEWEB)

    Acosta, Andy L. Romero; Lores, Stefan Gutierrez, E-mail: c19btm@frcuba.co.cu [Centro de Proteccion e Higiene de las Radiaciones (CPHR), La Habana (Cuba)

    2013-11-01

    This paper presents the design and implementation of an automated system for measurements in the calibration of reference radiation dosimeters. It was made a software application that performs the acquisition of the measured values of electric charge, calculated calibration coefficient and automates the calibration certificate issuance. These values are stored in a log file on a PC. The use of the application improves control over the calibration process, helps to humanize the work and reduces personnel exposure. The tool developed has been applied to the calibration of dosimeters radiation patterns in the LSCD of the Centro de Proteccion e Higiene de las Radiaciones, Cuba.

  8. Use of a robotic manipulator in the simulation of the automation of a calibration process of dosemeters; Uso de un manipulador robotico en la simulacion de la automatizacion de un proceso de calibracion de dosimetros

    Energy Technology Data Exchange (ETDEWEB)

    Benitez R, J.S.; Najera H, M.C. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    2002-07-01

    The development of a system based in a manipulative robot which simulates the operative sequence in a calibration process of dosemeters is presented. In this process it is performed the monitoring of the dosemeter positions and the calibrator by mean of an arm of articulated robot which develops the movement sequences and the taking a decision based on the information coming from the external sensors. (Author)

  9. Improvement of routes and production of CaSO{sub 4}-based dosimeters with unusual doping; Aprimoramento de rotas e producao de dosimetros a base de CaSO{sub 4} com dopagens nao usuais

    Energy Technology Data Exchange (ETDEWEB)

    Junot, Danilo Oliveira

    2017-07-01

    The widespread use of ionizing radiation in medicine and industry, associated with the known risks that this type of radiation can cause, has motivated the search for new radiation detectors, seeking improvements in the dosimetric characteristics and in the cost of production in comparison with commercial dosimeters disseminated. The motivation of this work is, therefore, to produce new thermoluminescent detectors through improved routes. Unusual elements in CaSO{sub 4} matrix doping, such as terbium (Tb) and ytterbium (Yb), were used as dopants in this matrix, as well as the europium (Eu), the thulium (Tm) and the silver (Ag), resulting in samples of CaSO{sub 4}:Eu,Tb, CaSO{sub 4}:Tb,Yb, CaSO{sub 4}:Tm,Ag and CaSO{sub 4}:Eu,Ag that were prepared by means of an adaptation of the method developed by Yamashita (1971). The route of synthesis is based on the mixture of calcium carbonate (CaCO{sub 3}) and dopant oxide (except for silver, incorporated in the form of metallic nanoparticles) in a solution of sulfuric acid. The mixture is heated until all the acid evaporates and only the powder of the material remains. In this route, the sulfuric acid is collected and can be reused. The phosphors produced were characterized by X-ray diffraction and radioluminescence techniques. The silver particles, produced by the polyol method, were characterized by scanning electron microscopy. Composites were obtained from the addition of Teflon to the phosphors. The thermoluminescence (TL) and the optically stimulated luminescence (OSL) of the new materials produced were investigated. Thermoluminescent characteristics such as sensitivity, linearity, reproducibility, minimum detectable dose, kinetic order and fading were evaluated and discussed. The CaSO{sub 4}:Tb,Eu composites showed TL glow curves with peaks at temperatures of 170 °C, 270 °C and 340 °C. The CaSO{sub 4}:Tb,Yb composites presented TL glow curves with peaks at temperatures of 90 °C, 160 °C, 240 °C and 340 °C. CaSO{sub 4}:Tm showed peaks at temperatures of 140 °C and 225 °C and the CaSO{sub 4}:Tm,Ag presented peaks at temperatures of 140 °C, 280 °C and 380 °C. All composites showed a linear and reproducible dose response. The TL emission spectrum of the composites was also evaluated. The samples of calcium sulfate doped with europium and silver particles (CaSO{sub 4}:Eu,Ag) showed great potential for applicability in the OSL dosimetry. (author)

  10. Determination of the dose rapidity of a {sup 90} Sr beta radiation source using thermoluminescent dosemeters; Determinacion de la rapidez de dosis de una fuente de radiacion beta de {sup 90}Sr usando dosimetros termoluminiscentes

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez M, P.R.; Azorin N, J.; Rivera M, T. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    2000-07-01

    The thermoluminescent dosemeters developed in Mexico, have been used efficiently in environmental and personal dosimetry. When the dose rate of some source is not known can be estimated with the use of thermoluminescent dosemeters taking in account the geometrical array used in the irradiations for reproducibility of the results in posterior irradiations. In this work it was estimated the dose rate of a {sup 90} Sr-{sup 90} Y beta radiation source which is property of the Nuclear Sciences Institute, UNAM, therefore it was l ended to the Metropolitan Autonomous University- Iztapalapa Unit for the characterization of new Tl materials, taking account of the institutional collaboration agreements. (Author)

  11. The former tests realized to a personal neutron dosemeter based on solid nuclear tracks detector; Primeras pruebas realizadas a un dosimetro personal de neutrones basado en detectores solidos de trazas nucleares

    Energy Technology Data Exchange (ETDEWEB)

    Camacho, M.E.; Tavera, L.; Balcazar, M. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1997-07-01

    Due to the increase in the use of neutron radiation a personal neutron dosemeter based on solid nuclear tracks detector (DSTN) was designed and constructed. The personal dosemeter design consists of three arrangements. The first one consists of a plastic nuclear tracks detector (LR115 or CR39) in contact with a LiF pellet. The second one is the same that above but it placed among two cadmium pellets and, the third one is formed by the alone detector without converter neither neutron absorber. The three arrangements are placed inside a plastic porta detector hermetically closed to avoid the bottom produced by environmental radon whichever both detectors (LR115 and CR39) are sensitive. In this work the former tests realized to that dosemeter are presented. (Author)

  12. Study and characterization of dosimeter LiF:Mg,Cu,P for using in aeronautical dosimetry; Estudo e caracterizacao do dosimetro de LiF:Mg,Cu,P para utilizacao em dosimetria aeronautica

    Energy Technology Data Exchange (ETDEWEB)

    Flavia, Hanna, E-mail: hannasantana.f@gmail.com [Universidade Paulista (UNIP), Sao Jose dos Campos, SP (Brazil); Federico, Claudio; Lelis, Odair; Pereira, Heloisa; Pereira, Marlon, E-mail: claudiofederico@ieav.cta.br [Instituto de Estudos Avancados (EFA-A/IEAV), Sao Jose dos Campos, SP (Brazil). Div. de Fisica Aplicada

    2014-07-01

    The effects of cosmic ionizing radiation incidents in aircraft components and crews has been a source of concern and motivated increasingly studies and improvements in the area. The low dose rates involved in this radiation field in aircraft flight altitudes imply Dosimetric necessity of using materials with high efficiency of detection, to enable studies lower cumulative doses resulting in shorter routes or lower altitude. The choice of thermoluminescent dosimeters LiF: Mg, Cu, P was done by having a detection efficiency of about fifteen times higher than its predecessor (LiF: Mg, Ti), and therefore, applied in very low doses dosimetry, and environmental dosimetry . The implementation of the use of pair dosimetric TLD-600H and 700H-TLD will serve as support for testing and studies on the effects of low doses of cosmic radiation in environmental dosimetry applied in the aviation environment in the usual flight altitudes. In this paper are presented the results of development of a methodology for dosimetry low doses of gamma radiation and neutrons using the pair dosimetric TLD-600H and 700H-TLD. The results demonstrate a sensitivity of dosimeters well above the dosimeters LiF: Mg, Ti confirming its suitability for dosimetry of low doses.

  13. PPV analysis and tension of spectral peak in an X radiation equipment for dosemeter calibration; Analise do PPV e tensao de pico espectral em um equipamento de raios-X para calibracao de dosimetros

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, P.M.C.; Santana, P.C. [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Departamento de Anatomia e Imagem; Lacerda, M.A.S.; Silva, T.A. da, E-mail: pmco@cdtn.br [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)

    2014-07-01

    Dosimetry laboratories around the world try to achieve metrology consistency between the X-rays beams for therapy and diagnostic detectors calibration. One of the parameters to characterize X-ray beam is the practical peak voltage (PPV) assessment. In this work were evaluated the PPV and spectral peak voltage in the potential constant X-ray equipment, that result in a mean difference of 1.4 %. (author)

  14. Implementation of a laboratory for manufacture, repair and electric calibration of dosemeters based in ionization chambers utilized in radiotherapy; Implementacao de um laboratorio para manutencao, reparo e calibracao eletrica de dosimetros baseados em camaras de ionizacao, utilizados em radioterapia

    Energy Technology Data Exchange (ETDEWEB)

    Becker, P.H.B.; Peres, M.A.L.; Moreira, A.J.C.; Nette, H.P. [Instituto de Radioprotecao e Dosimetria. Av. Salvador Allende S/N. Barra de Tijuca CEP: 22780-160. Caixa Postal: 37750 Rio de Janeiro-RJ (Brazil)

    1998-12-31

    Manufacturers of ionization chamber dosimeters for radiotherapy maintain only sales representatives in Brazil with no servicing capability causing difficulties to customers/users to get broken equipment back into operation. Aiming to partially solve this problem, a laboratory for maintenance, repair and electrical calibration was started in 1995 with the support of a two year IAEA Technical Assistance Project (BRA/1/031). (Author)

  15. Interventional radiology simulation and measurement of patient doses; Simulacion en radiologia intervencionista y medida de dosis a pacientes

    Energy Technology Data Exchange (ETDEWEB)

    Herraiz Lablanca, M. d.; Diaz Romero, F.; Hernandez Armas, J.

    2011-07-01

    In this paper we propose a method of work to calculate the effective dose in any interventional radiology procedure using an Alderson Rando anthropomorphic phantom and dosimeters TLD 100 chip. We applied this method in the case of biliary drainage and allowed us to establish the dose value corresponding reference in the Hospital Universitario de Canarias (HUC).

  16. Obtention of a thermoluminescent material for dosimetry of ionizing radiation

    International Nuclear Information System (INIS)

    Gonzalez M, P.R.

    1990-01-01

    The thermoluminescent dosemeters are small crystals which suffer changes in their structure by the radiation effect, being displaced the electrons toward higher energy levels. On heating the previously irradiated crystals, the electrons come back to their base state emitting light photons. The light quantity emitted is proportional to the received radiation dose. The light quantity emitted is proportional to the received radiation dose. The lithium fluoride is one of the thermoluminescent materials considered as tissue equivalents by having a low effective atomic number (Z ef ). At present, the more used commercial product used of this type is the TLD-100*. In this work the obtained results in the preparation of the lithium fluoride thermoluminescent material are presented. This is activated with magnesium (Mg) and titanium (Ti), which we have labelled as: LiF: Mg, Ti. The results from the tests performed for verifying his thermoluminescent properties are presented too, as powder form as in pellets form. These tests were performed in simultaneous form with TLD-100 samples, which is considered as reference. The LiF: Mg, Ti thermoluminescent material manufactured in the ININ presents similar dosimetric characteristics to those ones of the TLD-100. Therefore being able to replace the imported dosemeters. * (TLD-100 is a commercial trademark registered by Harshaw/Filtrol (US) for LiF: Mg, Ti Tl dosemeters) (Author)

  17. Electron beam energy monitoring using thermoluminescent dosimeters and electron back scattering

    International Nuclear Information System (INIS)

    Nelson, Vinod; Gray, Alison

    2013-01-01

    Periodic checks of megavoltage electron beam quality are a fundamental requirement in ensuring accurate radiotherapy treatment delivery. In the present work, thermoluminescent dosimeters (TLDs) positioned on either side of a lead sheet at the surface of a water equivalent phantom were used to monitor electron beam quality using the electron backscattering method. TLD100 and TLD100H were evaluated as upstream detectors and TLD200, TLD400 and TLD500 were evaluated as downstream detectors. The evaluation assessed the test sensitivity and correlation, long and short term reproducibility, dose dependence and glow curve features. A prototype of an in-air jig suitable for use in postal TLD dose audits was also developed and an initial evaluation performed. The results indicate that the TLD100-TLD200 combination provides a sensitive and reproducible method to monitor electron beam quality. The light weight and easily fabricated in-air jig was found to produce acceptable results and has the potential to be used by radiation monitoring agencies to carry out TLD postal quality assurance audits, similar to audits presently being conducted for photon beams. -- Highlights: ► Monitoring electron beam quality via electron backscattering was investigated. ► Different thermoluminescent materials were evaluated as detectors. ► A TLD100-TLD200 combination produced the most sensitive and reproducible results. ► An in-air jig was evaluated to allow measurements via postal dose audits

  18. Obtention of a thermoluminescent material for dosimetry of ionizing radiation; Obtencion de un material termoluminiscente para dosimetria de la radiacion ionizante

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez M, P.R

    1990-07-01

    The thermoluminescent dosemeters are small crystals which suffer changes in their structure by the radiation effect, being displaced the electrons toward higher energy levels. On heating the previously irradiated crystals, the electrons come back to their base state emitting light photons. The light quantity emitted is proportional to the received radiation dose. The light quantity emitted is proportional to the received radiation dose. The lithium fluoride is one of the thermoluminescent materials considered as tissue equivalents by having a low effective atomic number (Z{sub ef}). At present, the more used commercial product used of this type is the TLD-100*. In this work the obtained results in the preparation of the lithium fluoride thermoluminescent material are presented. This is activated with magnesium (Mg) and titanium (Ti), which we have labelled as: LiF: Mg, Ti. The results from the tests performed for verifying his thermoluminescent properties are presented too, as powder form as in pellets form. These tests were performed in simultaneous form with TLD-100 samples, which is considered as reference. The LiF: Mg, Ti thermoluminescent material manufactured in the ININ presents similar dosimetric characteristics to those ones of the TLD-100. Therefore being able to replace the imported dosemeters. * (TLD-100 is a commercial trademark registered by Harshaw/Filtrol (US) for LiF: Mg, Ti Tl dosemeters) (Author)

  19. Numerical analysis of thermoluminescence glow curves; Analisis numerico de las cruvas de termoluminiscencia

    Energy Technology Data Exchange (ETDEWEB)

    Gomez Ros, J. M.; Delgado, A.

    1989-07-01

    This report presents a method for the numerical analysis of complex thermoluminescence glow curves resolving the individual glow peak components. The method employs first order kinetics analytical expressions and is based In a Marquart-Levenberg minimization procedure. A simplified version of this method for thermoluminescence dosimetry (TLD) is also described and specifically developed to operate whit Lithium Fluoride TLD-100. (Author). 36 refs.

  20. Numerical analysis of thermoluminescence glow curves

    International Nuclear Information System (INIS)

    Gomez Ros, J. M.; Delgado, A.

    1989-01-01

    This report presents a method for the numerical analysis of complex thermoluminescence glow curves resolving the individual glow peak components. The method employs first order kinetics analytical expressions and is based In a Marquart-Levenberg minimization procedure. A simplified version of this method for thermoluminescence dosimetry (TLD) is also described and specifically developed to operate whit Lithium Fluoride TLD-100. (Author). 36 refs

  1. Characterization of the personal thermoluminescent dosemeter of LiF: Mg, Ti + Ptfe

    International Nuclear Information System (INIS)

    Azorin N, J.; Gutierrez C, A.; Gonzalez M, P.

    1991-01-01

    The objective of this work is to characterize the thermoluminescent dosemeters taken place in the laboratory in form of pellets of LiF: Mg, Ti + Ptfe like personal dosemeters, subjecting them to the operation tests proposed by the international standards and comparing them with the TLD-100, the Tl dosemeter more used at the moment for personal dosimetry

  2. Thermally and optically stimulated luminescence of AlN-Y2O3 ceramics after ionising irradiation

    DEFF Research Database (Denmark)

    Trinkler, L.; Bos, A.J.J.; Winkelman, A.J.M.

    1999-01-01

    Thermally (TL) and optically stimulated luminescence (OSL) were studied in AlN-Y2O3 ceramics after irradiation with ionising radiation. The extremely high TL sensitivity (approximately 60 times the sensitivity of LiF:Mg,Tl (TLD-100)) makes AlN-Y2O3 ceramics attractive as a TLD material. However...

  3. Combustion synthesis and preliminary luminescence studies of ...

    Indian Academy of Sciences (India)

    bustion synthesis and studied for its luminescence characteristics. The thermoluminescence (TL) glow curve of. LBPT material consists of two peaks at 204.54 and 251.21◦C. The optimum concentration was 0.005 mol to obtain the higher TL intensity compared to commercial TLD-100 phosphor. The peak shape method was ...

  4. Características Emprendedoras Personales (CEP De hombres y mujeres gerentes de las Cooperativas de Ahorro y Crédito de Riobamba: investigación 2010-2011

    Directory of Open Access Journals (Sweden)

    Barba-Bayas, Diego

    2013-06-01

    Full Text Available The study of Personal Entrepreneurial Characteristics (SPC is important to determine why, the successful management practices of male and female managers of the Credit Unions (COAC in the city of Riobamba, Ecuador. The development of the unions is due to the fact that they strengthen, steadily, constantly, with practice and training. If this human talent has the internal motivation and wants to acquire the knowledge and skills needed to achieve their goals they will implement an action plan with commitment, passion and determination (be active, willing and able. It is results that establish the state of knowledge of the processes, performed in different functional and social areas, of the management of cooperative societies. These must be governed by social and economic interests, which contribute with strength, force and presence to the welfare of its owners: the members. Given these considerations, the present research describes a general profile of the entrepreneurial or business capabilities of the managers; this profile changes due to the constant professionalization of the human talent in order to be at the head of this group of people, who form part of the social economy.

  5. Las Fortalezas Personales en la Educación Familiar: Programa de entrenamiento del humor y el optimismo para padres con hijos /as de 2 a 4 años de edad

    OpenAIRE

    Sánchez Campos, María Fernanda

    2016-01-01

    La Psicología Positiva viene a recuperar el interés de la Psicología por el afecto positivo y se puede considerar como punto de partida para el abordaje científico de la felicidad desde una perspectiva eudamónica. Las emociones positivas, los rasgos positivos de personalidad y las instituciones como la familia y la escuela que posibilitan el desarrollo de los anteriores conducen a la persona hacia tres formas óptimas de vivir que son la vida placentera, la vida comprometida y la vida con sent...

  6. La protección de datos personales en el ámbito de las redes sociales electrónicas : el valor de la autorregulación

    OpenAIRE

    López Jiménez, David

    2009-01-01

    I. INTRODUCCIÓN. II. REPERCUSIÓN DE INTERNET EN EL DERECHO FUNDAMENTAL A LA PROTECCIÓN DE DATOS DE CARÁCTER PERSONAL. III. LA PRIVACIDAD Y LAS REDES SOCIALES. 1. Concepto de red social. 2. Modalidades de redes sociales. 2.1. Redes sociales de ocio. 2.2. Redes sociales profesionales. 3. Prácticas potencialmente invasivas de la privacidad. 4. Especial consideración de los menores de edad e incapaces. IV. LA AUTORREGULACIÓN COMO ESTRATEGIA ORDENADORA IDÓNEA DE LAS ACTIVIDADES QUE SE DES...

  7. DEFINICIONES PERSONALES Y ASPECTOS ESTRUCTURALES DEL CONCEPTO DE LÍMITE FINITO DE UNA FUNCIÓN EN UN PUNTO (Personal Definitions and Structural Aspects of the Concept of Finite Limit of a Function at one Point

    Directory of Open Access Journals (Sweden)

    Juan Francisco Ruiz-Hidalgo

    2013-03-01

    Full Text Available Describimos e interpretamos las definiciones aportadas por un grupo de estudiantes de bachillerato sobre el concepto de límite finito de una función en un punto en términos de aspectos estructurales, compilados y sintetizados de investigaciones previas. Los aspectos estructurales son la interpretación como objeto o como proceso de la noción de límite, los algoritmos y las destrezas prácticas para su cálculo, su alcanzabilidad y su rebasabilidad. A partir de ellos, analizamos las definiciones recogidas. Entre los resultados, destacamos la riqueza de significado de estas definiciones por razón del carácter no alcanzable y no rebasable atribuido al límite y por su consideración dual como objeto o proceso. We describe and interpret the individual definitions of a group of non-compulsory secondary education students related to the concept of finite limit of a function at one point in terms of structural aspects compiled and synthesized from prior research. These aspects are the interpretation of the limit notion as an object or a process, its exact or approximate character, the algorithms and practical skills for its calculation, its reachability and its possibility of being exceeded. Among the results we point out the richness of meaning from these definitions by the not reachable and not exceedable attributed character of the limit, and also by the dual consideration of the limit as an object or process.

  8. Literatura y política en la «reconstrucción» de Jegua en Resistencia en el San Jorge: una lectura de los archivos personales de Orlando Fals Borda

    Directory of Open Access Journals (Sweden)

    Nohora Arrieta Fernández

    2015-01-01

    Full Text Available En Resistencia en el San Jorge, el tercer tomo de la Historia doble de la Costa, Orlando Fals Borda reconstruye las luchas campesinas de Jegua. Mediante la personificación del hombre-hicotea, Fals describe las formas del aguante campesino, que requiere, como en la hicotea, un alto grado de adaptación y formas muy sutiles de respuesta. El presente ensayo pretende reconstruir algunas características del diálogo entre Fals y dos de sus fuentes primordiales (las entrevistas a campesinos y El río San Jorge de Luis Striffler, con el fin de visualizar el envés del proceso argumentativo con el que autor intentó reescribir una historia de resistencias para los campesinos de Jegua.

  9. ¿Quiénes son los estudiantes que abandonan los estudios? Identificación de factores personales y familiares asociados al abandono escolar en estudiantes de educación media superior

    OpenAIRE

    Monroy Cazorla, Lucía; Jiménez Franco, Valentina; Ortega Torres, Laura; Chávez Archundia, Miriam

    2016-01-01

    Datos publicados por la Secretaría de Educación Pública denotan que uno de los mayores problemas que enfrenta el Sistema Educativo Nacional es la baja retención de los estudiantes de educación media superior. El propósito de este estudio fue identificar a los alumnos en riesgo de desertar. El estudio identifica las variables que impactan el abandono escolar en tres momentos posteriores a la presentación del examen de admisión.A partir de esta conceptualización se generaron diferentes grupos d...

  10. Scharoun versus Gehry : dos opciones metodológicas personales explícitas a partir del análisis de la Filarmónica de Berlín y el Walt Disney Concert Hall

    Directory of Open Access Journals (Sweden)

    Eneko Besa

    2012-12-01

    Full Text Available

    Resumen

    Estudio de la Filarmónica de Berlín como ejemplo de las  diferentes aproximaciones y contradicciones que la arquitectura “traba” a través del argumento que la constituye. Acuerdo tenso entre interior‐exterior, lugar‐programa, simetría‐asimetría,  unidad sintética ‐ complejidad múltiple, continuidad orgánica ‐ discontinuidad fragmentada.
    Comparativa con el edificio Walt Disney Concert Hall, en el que  se utiliza la misma tipología de sala de conciertos. Sin embargo y al contrario que Scharoun, Gehry evita cualquier acuerdo sintético de unidad, constituyendo el edificio a partir de la pura  fragmentación y diversidad per se. Pues en su caso, la unidad necesaria para constituir la autonomía y ser de la obra, se buscará a través de la imagen y expresión del concepto de  belleza que el edificio alcanza.

    Palabras clave

    sala de conciertos, lugar, unidad, exterior, fragmento

    Abstract

    This article is a study of the Berlin Philharmonic Concert Hall as an example of the different approximations and contradictions that Architecture ties together as a result of the reasoning that makes it up. A tense agreement between interior and exterior, place and program, symmetry and asymmetry, synthetic unity and multiple complexity, organic continuity and fragmented discontinuity.
    A comparison to Walt Disney Concert Hall is made, where the same concert hall typology is used. Nevertheless, in contrast to Scharoun, Gehry avoids any kind of synthetic agreement of unity, conceiving the building out of pure fragmentation and  diversity per se. In Gehry’s case, the unity necessary to constitute the autonomy and essence of the building is sought  through the image and expression of the concept of beauty that it reaches.

    Key words

    concert hall, place, unity, exterior, fragment

  11. influences by personal perceptions about nascent entrepreneurs hip activity. A gender perspective across different economic environments; Influencias de las percepciones personales sobre la actividad emprendedora naciente una perspectiva de genero a traves de diferentes entornos economicos

    Energy Technology Data Exchange (ETDEWEB)

    Martinez Mateo, J.; Mira Solves, I.; Gomez Gras, J. M.

    2012-11-01

    This paper explores the contribution of perceptions on entrepreneurial propensity from a gender perspective and depending on the environment, analyzing its contingent role on the determinants and gender differences. Results highlight the significance of the self-efficacy, the perception of opportunities and the fear of failure; also show that the knowledge of entrepreneurs is essential. Nuances regarding the economic contexts and gender provide information relevant to development actions that can be adapted to specific environments and to the group concerned. (Author) 61 refs.

  12. Thermoluminescent (Tl) dosimetry of slow-neutron fields at radiotherapy dose level

    International Nuclear Information System (INIS)

    Gambarini, G.

    2003-01-01

    The dosimetry for radiotherapy involving neutrons is very complicated, owing to the complexity of secondary radiation components, whose contributions to the total absorbed dose have to be discriminated, owing to the different radiobiological effects. In order to separate thermal neutrons and photons, LiF dosimeters are mostly utilized. containing different percentage of Li, like as TLD-700, TLD-100 and TLD-600, but many problems arise. In the response of TLD-700 exposed to neutron-gamma mixed fields with high neutron flux, the contribution of thermal neutrons to the Tl emission is high. Moreover. TLD-100 and TLD-600 may undergo radiation damage, and great care has to be taken in order to obtain reliable results. Other TLDs showing lower sensitivity to neutrons are proposed and experimented for such high-flux neutron fields. The faced problems and various proposed solutions are here described. (Author)

  13. Electron irradiation response on Ge and Al-doped SiO{sub 2} optical fibres

    Energy Technology Data Exchange (ETDEWEB)

    Yaakob, N.H.; Wagiran, H. [Department of Physics, Universiti Teknologi Malaysia, 81310 Skudai, Johor Darul Takzim (Malaysia); Hossain, I., E-mail: imamhossain@utm.m [Department of Physics, Universiti Teknologi Malaysia, 81310 Skudai, Johor Darul Takzim (Malaysia); Ramli, A.T. [Department of Physics, Universiti Teknologi Malaysia, 81310 Skudai, Johor Darul Takzim (Malaysia); Bradley, D.A [Department of Physics, University of Surrey, Guildford GU2 7XH (United Kingdom); Hashim, S. [Department of Physics, Universiti Teknologi Malaysia, 81310 Skudai, Johor Darul Takzim (Malaysia); Ali, H. [Department of Radiotherapy and Oncology, Hospital Sultan Ismail, Johor Darul Takzim (Malaysia)

    2011-05-01

    This paper describes the thermoluminescence response, sensitivity, stability and reproducibility of SiO{sub 2} optical fibres with various electron energies and doses. The TL materials that comprise Al- and Ge-doped silica fibres were used in this experiment. The TL results are compared with those of the commercially available TLD-100. The doped SiO{sub 2} optical fibres and TLD-100 are placed in a solid phantom and irradiated with 6, 9 and 12 MeV electron beams at doses ranging from 0.2 to 4.0 Gy using the LINAC at Hospital Sultan Ismail, Johor Bahru, Malaysia. It was found that the commercially available Al- and Ge-doped optical fibres have a linear dose-TL signal relationship. The intensity of TL response of Ge-doped fibre is markedly greater than that of the Al-doped fibre.

  14. Electron irradiation response on Ge and Al-doped SiO 2 optical fibres

    Science.gov (United States)

    Yaakob, N. H.; Wagiran, H.; Hossain, I.; Ramli, A. T.; Bradley, D. A.; Hashim, S.; Ali, H.

    2011-05-01

    This paper describes the thermoluminescence response, sensitivity, stability and reproducibility of SiO 2 optical fibres with various electron energies and doses. The TL materials that comprise Al- and Ge-doped silica fibres were used in this experiment. The TL results are compared with those of the commercially available TLD-100. The doped SiO 2 optical fibres and TLD-100 are placed in a solid phantom and irradiated with 6, 9 and 12 MeV electron beams at doses ranging from 0.2 to 4.0 Gy using the LINAC at Hospital Sultan Ismail, Johor Bahru, Malaysia. It was found that the commercially available Al- and Ge-doped optical fibres have a linear dose-TL signal relationship. The intensity of TL response of Ge-doped fibre is markedly greater than that of the Al-doped fibre.

  15. Electron irradiation response on Ge and Al-doped SiO2 optical fibres

    International Nuclear Information System (INIS)

    Yaakob, N.H.; Wagiran, H.; Hossain, I.; Ramli, A.T.; Bradley, D.A; Hashim, S.; Ali, H.

    2011-01-01

    This paper describes the thermoluminescence response, sensitivity, stability and reproducibility of SiO 2 optical fibres with various electron energies and doses. The TL materials that comprise Al- and Ge-doped silica fibres were used in this experiment. The TL results are compared with those of the commercially available TLD-100. The doped SiO 2 optical fibres and TLD-100 are placed in a solid phantom and irradiated with 6, 9 and 12 MeV electron beams at doses ranging from 0.2 to 4.0 Gy using the LINAC at Hospital Sultan Ismail, Johor Bahru, Malaysia. It was found that the commercially available Al- and Ge-doped optical fibres have a linear dose-TL signal relationship. The intensity of TL response of Ge-doped fibre is markedly greater than that of the Al-doped fibre.

  16. The TL fluence response to heavy charged particles using the track interaction model and track structure information

    International Nuclear Information System (INIS)

    Rodriguez-Villafuerte, M.; Avila, O.

    2002-01-01

    The extended track interaction model, ETIM, has recently been proposed to explain the TLD-100 fluence response of peak 5 to heavy ions. This model includes the track structure information through the use of the luminescent-centre occupation probability obtained from radial dose distributions produced by the ions as they travel through the dosemeter. In this work an implementation of ETIM using Monte Carlo techniques is presented. The simulation was applied to calculate the response of peak 5 of both sensitised and normal TLD-100 crystals to 2.6 and 6.8 MeV 4 He ions. The simulation shows that the TL-fluence response has a strong dependence on ion energy, in disagreement with experimental observations. In spite of this, good agreement between the simulated TL-fluence response calculated for the 6.8 MeV 4 He radial distributions and the experimental data for the two energies was achieved. (author)

  17. Proposal of a postal system for Ir-192 sources calibration used in high dose rate brachytherapy with LiF:Mn:Ti thermoluminescent dosemeters

    International Nuclear Information System (INIS)

    Vieira, W.S.; Borges, J.C.; Almeida, C.E.V.

    1998-01-01

    A proposal in order to improve the brachytherapy quality control and to allow postal intercomparison of Ir-192 sources used in high dose rate brachytherapy has been presented. The LiF: Mn: Ti (TLD 100) detector has been selected for such purpose. The experimental array and the TLDs irradiation and calibration techniques, at the treatment units, have been specified in the light of more recent methodology of Ir-192 calibration sources. (Author)

  18. The influence of temperature and humidity on the stability of the response of different thermoluminescent detectors

    International Nuclear Information System (INIS)

    Rosa, L.A.R. da

    1989-01-01

    Fading results are presented for thermoluminescent detectors for temperatures of 20, 35 and 50 0 C and for relative humidities of 50 and 90% during storage periods of up to 30 days. The thermoluminescent detectors investigated were LiF:Mg,Ti(TLD-100 and TLD-700), CaF 2 :Dy(TLD-200) and Li 2 B 4 O 7 :Mn,Si. These detectors are very commonly used in personnel monitoring. (author)

  19. Thermoluminescence of LiF: Mg, Ti between 77 and 315 K

    International Nuclear Information System (INIS)

    Rosa, L.A.R. da.

    1989-01-01

    A special thermoluminescent system was developed. It is able to operate right from liquid nitrogen temperature and also permits the determination of the sample thermoluminescent emission spectrum. Using this system, the thermoluminescence displayed by 77 K irradiated LiF:Mg,Ti (TLD-100), from the irradiation temperature to 315 K, was studied. In this temperature range seven glow peaks, at 139, 153, 194, 240, 260, 283 and 300 K, were determined. (author)

  20. Measurement of dosimetric parameters and dose verification in stereotactic radiosurgery (SRS)

    International Nuclear Information System (INIS)

    Reduan Abdullah; Nik Ruzman Nik Idris; Ahmad Lutfi Yusof; Mazurawati Mohamed

    2013-01-01

    Full-text: The purpose of this study was to measure the dosimetric parameters for small photon beams to be used as input data treatment planning computer system (TPS) and to verify dose calculated by TPS in Stereotactic Radiosurgery (SRS) procedure. The beam data required were Percentage Depth Dose (PDD), Off-axis Ratio (OAR), and Scatter Factor of Relative Output Factor. Small beams of 5 mm to 45 mm diameter circular cone collimators used in SRS were utilized for beam data measurements measured using pinpoint 3D ionization chamber (0.016 cc). For second part of this study, we reported the important quality assurance (QA) procedures before SRS treatment that influenced the dose delivery. These QA procedures consist of measurements on the accuracy in target localization and room laser alignment. The dose calculated to be delivered for treatment was verified using pinpoint 3D ionization chamber and TLD 100H. The mean deviation of measured dose using TLD 100H compared to calculated dose was 3.37 %. Beside that, pinpoint ionization 3D chamber give more accurate results of dose compared to TLD 100H. The measured dose using pinpoint 3D ionization chamber are good agreement with calculated dose by TPS with deviation of 2.17 %. The results are acceptable such as recommended by International Commission on Radiation Units and Measurements (ICRU) Report No. 50 (1993) that dose delivered to the target volume must be within ±5 % error. (author)

  1. Manufacturing polycrystalline pellets of natural quartz for applications in thermoluminescence dosimetry

    Energy Technology Data Exchange (ETDEWEB)

    Carvalho Junior, Alvaro Barbosa de; Khoury, Helen Jamil [Federal University of Pernambuco (UFPE), Recife, PE (Brazil). Department of Nuclear Energy; Barros, Thiago Fernandes; Guzzo, Pedro Luiz [Federal University of Pernambuco (UFPE), Recife, PE (Brazil). Department of Mining Engineering

    2012-07-15

    This paper describes the manufacturing process of quartz-pellets and shows their potential use as thermoluminescence dosimeters (TLD) for those applications where low-levels of ionising radiation are present. Two batches of cold-pressed pellets were produced and their resistance were evaluated by vibration tests and weight-loss measurements. The batch manufactured with 75 Multiplication-Sign 150 Micro-Sign m particles showed enough resistance to be employed as TLD. The dosimetric properties of the 310 Degree-Sign C peak appearing in the glow curves of these pellets were characterized together with commercial TLD-100 units using {gamma}- and X-ray beams with different energies. The uncertainties related to reproducibility and stability of the TL signal were better than 10%. The sensitivity and the linearity of the TL response of quartz-pellets were better than that measured for TLD-100 for doses ranging from 0.5 to 200mGy. The energy dependence of the quartz-pellets was higher than that of TLD-100 but it cannot be considered a restriction to their use in clinical procedures and industrial applications. (author)

  2. Evaluation of aluminum oxide dosimeters using OSL technique in dosimetry of clinical photon beams on volumetric modulated arc treatment; Avaliacao de dosimetros de oxido de aluminio pela tecnica OSL na dosimetria de campos de fotons clinicos utilizados no tratamento radioterapico em arco modulado volumetrico

    Energy Technology Data Exchange (ETDEWEB)

    Villani, Daniel

    2017-07-01

    Treatment using Volumetric Modulated Arc Radiation Therapy is the most modern modality of conformational radiotherapy so that, with the overlapping of several fields, the dose distributions provide a perfect conformation to the tumor, reducing the probability of complications in adjacent normal tissues. In this sense, many efforts are being invested to improve dose distribution compliance as well as the integration of imaging techniques for tumor screening and correction of inter and intrafraction variations. To this end, an intensive monitoring of the quality of the processes and a quality assurance program are fundamental for patient safety and compliance with current legislation; besides the use of different dosimetry methodologies for intercomparison and validation of the results. The aim of this study is to evaluate and compare the performance of aluminum oxide (Al{sub 2}O{sub 3}:C) OSL dosimeters manufactured by Landauer Inc. with those produced by Rexon™ in the dosimetry of high energy photon clinical bundles used in Volumetric Modulated Arc Therapy - (VMAT) using different simulating objects. The dosimeters were characterized for gamma radiation of the {sup 60}Co and for clinical photon beams of 6 MV typical of treatments by VMAT under conditions of electronic equilibrium and maximum dose respectively. Performance tests of the TL and OSL readers used and repeatability of the samples were evaluated. After all tests, the dosimeters were irradiated in the simulation of different radiotherapy treatments by VMAT and their responses compared to the planning system. All types of dosimeters presented satisfactory results in verifying the doses of this type of planning simulation. The Al{sub 2}O{sub 3}:C dosimeters presented compatible results and validated by the other dosimeters and ionization chamber. Regarding the best technique, the OSL InLight commercial system presents greater practicality and versatility for use and application in the clinical routine. (author)

  3. Comparison of two models for the X-ray dispersion produced in a Novillo Tokamak with measurements make with thermoluminescent dosemeters; Comparacion de dos modelos para la dispersion de rayos X producidos en un Novillo Tokamak con mediciones efectuadas con dosimetros termoluminiscentes

    Energy Technology Data Exchange (ETDEWEB)

    Flores O, A.; Castillo, A.; Barocio, S.R.; Melendez L, L.; Chavez A, E.; Cruz C, G.J.; Lopez, R.; Olayo, M.G.; Gonzalez M, P. [Instituto Nacional de Investigaciones Nucleares, 52045 Salazar, Estado de Mexico (Mexico); Azorin N, J. [Universidad Autonoma Metropolitana Iztapalapa, 09340 Mexico D.F. (Mexico)

    1999-07-01

    It was presented the results to study about the X-ray dispersion produced in the Novillo Tokamak using thermoluminescent dosemeters (DTL). The measurements were make in the equatorial plane of Tokamak, along twelve radial directions. The dispersion is observed due to the radiation interaction with walls surrounding the machine. It was proposed two types of heuristic mathematical methods for describing the X-ray dispersion, comparing them with the experimental data obtained with Dtl. The predictions of both models are adjusted well to the experimental data. (Author)

  4. Measurement of the dose by dispersed radiation in a lineal accelerator using thermoluminescent dosimeters of CaSO{sub 4}:Dy; Medicion de la dosis por radiacion dispersa en un acelerador lineal usando dosimetros termoluminiscentes de CaSO{sub 4}:Dy

    Energy Technology Data Exchange (ETDEWEB)

    Chavez C, N.; Torijano, E.; Azorin, J. [Universidad Autonoma Metropolitana, Unidad Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, 09340 Mexico D. F. (Mexico); Herrera, A. [ISSSTE, Hospital Nacional 20 de Noviembre, Eje 7 Sur Felix Cuevas Esq. Av. Coyoacan, Col. del Valle, 03229 Mexico D. F. (Mexico)

    2014-08-15

    The thermoluminescence (Tl) is based on the principle of the luminescent in a material when is heated below their incandescence temperature. Is a technique very used in dosimetry that is based on the property that have most of the crystalline materials regarding the storage of the energy that they absorb when are exposed to the ionizing radiations. When this material has been irradiated previously, the radioactive energy that contains is liberated in form of light. In general, the principles that govern the thermoluminescence are in essence the same of those responsible for all the luminescent processes and, this way, the thermoluminescence is one of the processes that are part of the luminescence phenomenon. For this work, the dispersed radiation was measured in the therapy area of the lineal accelerator of medical use type Elekta, using thermoluminescent dosimeters of CaSO{sub 4}:Dy + Ptfe developed and elaborated in the Universidad Autonoma Metropolitana, Unidad Iztapalapa. With the dosimeters already characterized and calibrated, we proceeded to measure the dispersed radiation being a patient in treatment. The results showed values for the dispersed radiation the order of a third of the dose received by the patient on the treatment table at 30 cm of the direct beam and the order of a hundredth in the control area (4 m of the direct beam, approximately). The conclusion is that the thermoluminescent dosimeters of CaSO{sub 4}: Dy + Ptfe are appropriate to measure dispersed radiation dose in radiotherapy. (author)

  5. 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

  6. Measuring the absorbed dose in critical organs during low rate dose brachytherapy with {sup 137} Cs using thermoluminescent dosemeters; Medicion de la dosis absorbida en organos criticos durante braquiterapia de baja tasa de dosis con {sup 137} Cs usando dosimetros termoluminiscentes

    Energy Technology Data Exchange (ETDEWEB)

    Torres, A. [UAEM, Fac. de Medicina, 50180 Toluca, Estado de Mexico (Mexico); Gonzalez, P.R. [ININ, A.P. 18-1027, 11801 Mexico D.F. (Mexico); Furetta, C.; Azorin, J. [UAM-I, 09340 Mexico D.F. (Mexico); Andres, U.; Mendez, G. [Centro Estatal de Cancerologia de Tabasco, A. Gregorio Mendez No. 2838, Col. Atasta, 86100 Villahermosa, Tabasco (Mexico)

    2003-07-01

    Intracavitary Brachytherapy is one of the most used methods for the treatment of the cervical-uterine cancer. This treatment consists in the insertion of low rate dose {sup 137}Cs sources into the patient. The most used system for the treatment dose planning is that of Manchester. This planning is based on sources, which are considered fixed during the treatment. However, the experience has shown that, during the treatment, the sources could be displaced from its initial position, changing the dose from that previously prescribed. For this reason, it is necessary to make measurements of the absorbed dose to the surrounding organs (mainly bladder and rectum). This paper presents the results of measuring the absorbed dose using home-made LiF: Mg, Cu, P + Ptfe thermoluminescent dosimeters (TLD). Measurements were carried out in-vivo during 20 minutes at the beginning and at the end of the treatments. Results showed that the absorbed dose to the critical organs vary significantly due to the movement of the patient during the treatment. (Author)

  7. Calibration of photographic dosemeters to evaluate the personal equivalent dose, Hp (10), irradiated by different radiation qualities and angles of incidence; Calibracao de dosimetros fotograficos para avaliar o equivalente de dose pessoal, Hp(10), irradiados por diferentes qualidades de radiacao e angulos de incidencia

    Energy Technology Data Exchange (ETDEWEB)

    Santoro, Christiana; Antonio Filho, Joao, E-mail: chsantoro@gmail.com, E-mail: jaf@ufpe.br [Universidade Federal de Pernambuco (DEN/UFPE), Recife, PE (Brazil). Departamento de Energia Nuclear; Santos, Marcus Aurelio P.; Goncalves Filho, Luiz Carlos, E-mail: masantos@cnen.gov.br, E-mail: l.filho@cnen.gov.br [Centro Regional de Ciencias Nucleares do Nordeste (CRCN-NE/CNEN-PE), Recife, Pe (Brazil)

    2013-07-01

    To use radiation detectors, should periodically perform tests and calibrations on instruments in order to verify its good functionality. One way to ascertain the quality of the instrument is to conduct a study of the angular dependence of the response of the radiation detectors. The photographic dosimetry has been used widely to quantify the radiation doses and to estimate levels of doses received by workers involved with X-and gamma radiation. Photographic dosimeters are used because provide wide range of exposure and good accuracy. One of the sources of error have been introduced by different irradiation geometries between calibration and measurement in radiation fields used in x-ray and gamma ray sources, therefore, there is a need for an evaluation of the sensitivity of dosimeters with variation of the angle of the incident beam. In this study were tested 190 photographic dosemeters in the Metrology Laboratory of the Centro Regional de Ciencias Nucleares do Nordeste (CRCN-NE) using the phantom H{sub p} (10), where the dosimeters are evaluated on the basis of the new operational magnitude for individual monitoring, the equivalent personal dose, H{sub p} (10). Angular dependence of these radiation detectors was studied in X radiation fields (in the range of 45 keV energy to 164 keV) and gamma radiation ({sup 137}Cs-662 keV e {sup 60}Co - 1250 keV)

  8. Evaluation of the natural radioactivity in the gamma range by means of a manual dosimeter in the interior and external of housing in Cusco; Evaluacion de la radioactividad natural en el rango gamma mediante un dosimetro manual en el interior y exterior de viviendas en el Cusco

    Energy Technology Data Exchange (ETDEWEB)

    Warthon, J.; Olarte, A.; Valencia, J., E-mail: juliowarthon@hotmail.com [Universidad Nacional de San Antonio Abad del Cusco, Facultad de Ciencias Quimicas, Fisicas y Matematicas, Av. de la Cultura No. 733, Cusco (Peru)

    2014-08-15

    The natural radioactivity is present in our environment and at any time the humans are exposed to this radiation type. In the 90 in Cusco city (Peru) were carried out measurements of environmental radioactivity for Umeres F. and L. Sajo, the information obtained by these investigators is valuable about the natural radioactivity in diverse places of the Cusco city; the current investigation consists on the measurement of the natural radioactivity inside and outside of the buildings in Cusco city. For 2013 and 2014 the radioactivity study has been programmed in the interior and exterior of constructions, the measures began in January 2013, to date has a considerable database. Each measures group consists of 100 tests in the interior and another similar quantity in the exterior of housing in the Cusco city; the measurement process was carried out with a manual dosimeter Geiger Muller-Zahlrohre, the average value obtained to the date is of 2.1 mSv/year which approaches to the average world value that is 2.4 mSv/year. (Author)

  9. Procedures for calibration of clinical dosemeters of radiotherapy with gamma radiation Co-60 in the IPEN-CNEN, Sao Paulo, Brazil;Procedimento de calibracao de dosimetros clinicos de radioterapia em feixes de radiacao gamma de Co-60 no IPEN-CNEN/SP

    Energy Technology Data Exchange (ETDEWEB)

    Damatto, Willian B.; Santos, Gelson P.; Potiens, Maria da Penha A.; Vivolo, Vitor [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2009-07-01

    The periodic calibration of clinic dosimeters is a very important task, because those measurement systems performing the control quality of the radioactive source and for that assure the control quality of the patient dose estimative. This paper shows the calibration procedures and routine improved in the calibration laboratory of IPEN/CNEN-SP to be applied to the clinic dosimeters following international and national recommendations and yet the spend care that the clients should have with the utilization of that measurement systems for control quality of the radiotherapy procedures, for reduce the dose received for patient, and workers, and for increase the confidence level of the measurements.(author)

  10. Study on routines and procedures of calibration of clinical dosemeter on gamma radiation beams at the IPEN-CNEN/SP, Brazil; Estudo das rotinas e procedimentos de calibracao de dosimetros clinicos em feixes de radiacao gama no IPEN-CNEN/SP

    Energy Technology Data Exchange (ETDEWEB)

    Damatto, Willian B.; Potiens, Maria da Penha A.; Santos, Gelson P.; Vivolo, Vitor, E-mail: wbdamatto@ipen.b, E-mail: mppalbu@ipen.b, E-mail: gpsantos@ipen.b, E-mail: vivolo@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2009-07-01

    The calibration consists in the comparison of the equipment to be calibrated with other equipment already calibrated by another standard, which means the equipment that will accomplish shall be considered secondary or tertiary, depending on the calibration that will be accomplished. As the clinical dosemeters are used for quality control services in the hospitals, these dosemeters need a reliable measurement precision. Therefore, this work intends to demonstrate the importance of the clinical dosemeter and the calibration, requiring special care face to all clinical set

  11. Study of the response to neutrons of a personal dosemeter in mixed fields (n, γ) in function of Hp(10)

    International Nuclear Information System (INIS)

    Cruzate, J.; Gregori, B.; Carelli, J.; Aguerre, L.; Discacciatti, A.

    2006-01-01

    In this work it is presented the theoretical study and their experimental validation of the answer of the personal dosimetro in terms of the component of neutrons of the personal equivalent dose Hpn(10) in function of the energy, in presence of fields of neutrons and range. The personal dosimetro, based on detecting termoluminiscentes (TLD), it consists of two detectors 7LiF and two 6LiF, located low filters of plastic and cadmium starting from whose information is evaluated the component range and of neutrons of the dose. Additionally it consists of a detecting CaF2, used basically to discriminate against the energy of the component range and to make the corresponding corrections on the evaluation of the dose range obtained with the 7LiF. The answer to neutrons in function of the energy, defined as the quotient among the one I number of reactions 6Li(n, a)4He taken place in each TLD and the Hpn(10), it was calculated using the code MCNPX and the library ENDF/B-VI. You model the dosimetro under the irradiation conditions proposed by the ISO8529-3. Faces monoenergeticos were simulated in the range of energy understood between 70 keV and 5 MeV. The dispersion in each one of the results of the simulation is smaller than 3%. You I study the existent relationship among the answer te6rica, reactions (n,a)/Hpn(10) and the experimental one, nC/Hpn(10), for a given thermal treatment. The factor of resulting conversion is constant in the energy and similar to 1,71 104 reacciones(n, a)/nC, with a smaller standard deviation to 10%. The experimental answer was obtained starting from the irradiations carried out in the mark of the International Intercomparacion of Dosimetria in Mixed Campos (n,) 2004 organized by the OIEA next to the PTB (Germany) and the IRSN (France). The extension of these calculations to other spectra of neutrons of fields real they will allow to obtain group of factors of application conversion in routine and accidental situations. (Author)

  12. Radiation dose to radiosensitive organs in PET/CT myocardial perfusion examination using versatile optical fibre

    Science.gov (United States)

    Salasiah, M.; Nordin, A. J.; Fathinul Fikri, A. S.; Hishar, H.; Tamchek, N.; Taiman, K.; Ahmad Bazli, A. K.; Abdul-Rashid, H. A.; Mahdiraji, G. A.; Mizanur, R.; Noor, Noramaliza M.

    2013-05-01

    Cardiac positron emission tomography (PET) provides a precise method in order to diagnose obstructive coronary artery disease (CAD), compared to single photon emission tomography (SPECT). PET is suitable for obese and patients who underwent pharmacologic stress procedures. It has the ability to evaluate multivessel coronary artery disease by recording changes in left ventricular function from rest to peak stress and quantifying myocardial perfusion (in mL/min/g of tissue). However, the radiation dose to the radiosensitive organs has become crucial issues in the Positron Emission Tomography/Computed Tomography(PET/CT) scanning procedure. The objective of this study was to estimate radiation dose to radiosensitive organs of patients who underwent PET/CT myocardial perfusion examination at Centre for Diagnostic Nuclear Imaging, Universiti Putra Malaysia in one month period using versatile optical fibres (Ge-B-doped Flat Fibre) and LiF (TLD-100 chips). All stress and rest paired myocardial perfusion PET/CT scans will be performed with the use of Rubidium-82 (82Rb). The optic fibres were loaded into plastic capsules and attached to patient's eyes, thyroid and breasts prior to the infusion of 82Rb, to accommodate the ten cases for the rest and stress PET scans. The results were compared with established thermoluminescence material, TLD-100 chips. The result shows that radiation dose given by TLD-100 and Germanium-Boron-doped Flat Fiber (Ge-B-doped Flat Fiber) for these five organs were comparable to each other where the p>0.05. For CT scans,thyroid received the highest dose compared to other organs. Meanwhile, for PET scans, breasts received the highest dose.

  13. Li:Mg,Cu,P versus LiF:Mg,Ti: A comparison of Some dosimetric properties

    International Nuclear Information System (INIS)

    Ben-Shachar, B.; Weinstein, M.; German, U.

    1999-01-01

    The most widely used technique in radiation dosimetry is thermoluminescence (TL), which makes use of materials, commonly divided into two groups: (a) tissue equivalent phosphors, winch generally exhibit low sensitivity to ionizing radiation, e.g. Li:Mg, Ti , Li 2 B 4 O 7 with Cu or Mn as impurities or Be 2 0 3 with different impurities. (b) phosphors with high sensitivity but poor equivalence to organic tissue, e.g. CaF 2 With Mn, Dy or Tm as impurities or CaSO 4 with Mn or Tm as impurities. For a TL dosimeter used in personnel or environmental dosimetry, both tissue-equivalence and high sensitivity are required. Lithium fluoride doped with magnesium and titanium, known commercially as TLD-100 (Harshaw), is still the most commonly used radiation dosimeter. It has become popular because of several properties, such as tissue equivalence, relative low fading, adequate sensitivity for personnel dosimetry and the possibility to manufacture the material with acceptable reproducibility. The LiF:Cu, Mg, P phosphor has several important advantages compared to Li:Mg, Ti. The extended range of linearity, lack of supra linearity and the more nearly ideal tissue equivalence response to low energy photons gives a significant advantage in clinical dosimetry. The higher sensitivity, improved signal to noise ratio, and shorter monitoring periods lead to greatly improved performance in environmental dosimetry. The ultra low relative TL response to neutrons is another important advantage in mixed field neutron/gamma dosimetry. The Li:Mg, Cu, P does suffer from several of the disadvantages associated with TLD-100, especially its complex glow curve, and its greater sensitivity than TLD-100 to heating procedures. A comparison of some main properties of the two phosphors is presented in this work

  14. Experimental method for calculation of effective doses in interventional radiology; Metodo experimental para calculo de dosis efectivas en radiologia intervencionista

    Energy Technology Data Exchange (ETDEWEB)

    Herraiz Lblanca, M. D.; Diaz Romero, F.; Casares Magaz, O.; Garrido Breton, C.; Catalan Acosta, A.; Hernandez Armas, J.

    2013-07-01

    This paper proposes a method that allows you to calculate the effective dose in any interventional radiology procedure using an anthropomorphic mannequin Alderson RANDO and dosimeters TLD 100 chip. This method has been applied to an angio Radiology procedure: the biliary drainage. The objectives that have been proposed are: to) put together a method that, on an experimental basis, allows to know dosis en organs to calculate effective dose in complex procedures and b) apply the method to the calculation of the effective dose of biliary drainage. (Author)

  15. SU-E-T-112: Experimental Characterization of a Novel Thermal Reservoir for Consistent and Accurate Annealing of High-Sensitivity TLDs.

    Science.gov (United States)

    Donahue, W; Bongiorni, P; Hearn, R; Rodgers, J; Nath, R; Chen, Z

    2012-06-01

    To develop and characterize a novel thermal reservoir for consistent and accurate annealing of high-sensitivity thermoluminescence dosimeters (TLD-100H) for dosimetry of brachytherapy sources. The sensitivity of TLD-100H is about 18 times that of TLD-100 which has clear advantages in for interstitial brachytherapy sources. However, the TLD-100H requires a short high temperature annealing cycle (15 min.) and opening and closing the oven door causes significant temperature fluctuations leading to unreliable measurements. A new thermal reservoir made of aluminum alloy was developed to provide stable temperature environment in a standard hot air oven. The thermal reservoir consisted of a 20 cm × 20 cm × 8 cm Al block with a machine-milled chamber in the middle to house the aluminum TLD holding tray. The thermal reservoir was placed inside the oven until it reaches thermal equilibrium with oven chamber. The temperatures of the oven chamber, heat reservoir, and TLD holding tray were monitored by two independent thermo-couples which interfaced digitally to a control computer. A LabView interface was written for monitoring and recording the temperatures in TLD holding tray, the thermal reservoir, and oven chamber. The temperature profiles were measured as a function of oven-door open duration. The settings for oven chamber temperature and oven door open-close duration were optimized to achieve a stable temperature of 240 0C in the TLD holding tray. Complete temperature profiles of the TLD annealing tray over the entire annealing process were obtained. A LabView interface was written for monitoring and recording the temperatures in TLD holding The use of the thermal reservoir has significantly reduced the temperature fluctuations caused by the opening of oven door when inserting the TLD holding tray into the oven chamber. It has enabled consistent annealing of high-sensitivity TLDs. A comprehensive characterization of a custom-built novel thermal reservoir for annealing

  16. Traceability of a panoramic gamma irradiator using different TLD systems as transfer Instruments; Trazabilidad de un irradiador panoramico mediante sistemas de dosimetria TL

    Energy Technology Data Exchange (ETDEWEB)

    Romero, A. M.; Saez, J. C

    1994-07-01

    This work shows the calibration in terms of the new operational radiological quantities Hp (10) and H(10) for different TLD systems (Harshaw TLD-100 and Panasonic UD-002) used in personal and environmental monitoring. The irradiations were performed in the Spanish Reference Laboratory in radiation protection levels, managed by the CIEMAT Metrology of ionizing radiations Unit. With those data, different calibrations of a panoramic gamma irradiator in terms of the radiological quantity for unit of time were established, providing the traceability of the irradiator to the Reference Laboratory using the corresponding TLD systems as transfer instruments. (Author) 9 refs.

  17. Traceability of a panoramic gamma irradiator using different TLD systems as transfer instruments

    International Nuclear Information System (INIS)

    Romero, A.M.; Saez, J.C.

    1994-01-01

    This work shows the calibration in terms of the new operational radiological quantities Hp(10) and H*(10) for different TLD systems (Harshaw TLD-100 and Panasonic UD-802) used in personal and environmental monitoring. The irradiations were performed in the Spanish Reference Laboratory in radiation protection levels, managed by the CIEMAT Metrology of ionizing radiations Unit. With these data, different calibrations of a panoramic gamma irradiator in terms of the radiological quantity for unit of time were established, providing the traceability of the irradiator to the Reference Laboratory using the corresponding TLD systems as transfer instruments. (Author) 9 refs

  18. Traceability of a panoramic gamma irradiator using different TLD systems as transfer Instruments

    International Nuclear Information System (INIS)

    Romero, A. M.; Saez, J. C

    1994-01-01

    This work shows the calibration in terms of the new operational radiological quantities Hp (10) and H(10) for different TLD systems (Harshaw TLD-100 and Panasonic UD-002) used in personal and environmental monitoring. The irradiations were performed in the Spanish Reference Laboratory in radiation protection levels, managed by the CIEMAT Metrology of ionizing radiations Unit. With those data, different calibrations of a panoramic gamma irradiator in terms of the radiological quantity for unit of time were established, providing the traceability of the irradiator to the Reference Laboratory using the corresponding TLD systems as transfer instruments. (Author) 9 refs

  19. The influence of neutron contamination on dosimetry in external photon beam radiotherapy.

    Science.gov (United States)

    Horst, Felix; Czarnecki, Damian; Zink, Klemens

    2015-11-01

    Photon fields with energies above ∼7 MeV are contaminated by neutrons due to photonuclear reactions. Their influence on dosimetry-although considered to be very low-is widely unexplored. In this work, Monte Carlo based investigations into this issue performed with fluka and egsnrc are presented. A typical Linac head in 18 MV-X mode was modeled equivalently within both codes. egsnrc was used for the photon and fluka for the neutron production and transport simulation. Water depth dose profiles and the response of different detectors (Farmer chamber, TLD-100, TLD-600H, and TLD-700H chip) in five representative depths were simulated and the neutrons' impact (neutron absorbed dose relative to photon absorbed dose) was calculated. To take account of the neutrons' influence, a theoretically required correction factor was defined and calculated for five representative water depths. The neutrons' impact on the absorbed dose to water was found to be below 0.1% for all depths and their impact on the response of the Farmer chamber and the TLD-700H chip was found to be even less. For the TLD-100 and the TLD-600H chip it was found to be up to 0.3% and 0.7%, respectively. The theoretical correction factors to be applied to absorbed dose to water values measured with these four detectors in a depth different from the reference/calibration depth were calculated and found to be below 0.05% for the Farmer chamber and the TLD-700H chip, but up to 0.15% and 0.35% for the TLD-100 and TLD-600H chips, respectively. In thermoluminescence dosimetry the neutrons' influence (and therefore the additional inaccuracy in measurement) was found to be higher for TLD materials whose 6Li fraction is high, such as TLD-100 and TLD-600H, resulting from the thermal neutron capture reaction on 6Li. The impact of photoneutrons on the absorbed dose to water and on the response of a typical ionization chamber as well as three different types of TLD chips was quantified and was as expected found to be very

  20. Optical and dosimetric properties of zircon.

    Science.gov (United States)

    Kristianpoller, N; Weiss, D; Chen, R

    2006-01-01

    Irradiation effects were investigated in zircon crystals by methods of optical absorption and luminescence. Special attention was given to the effects of vacuum ultraviolet (VUV) radiation. The same main thermoluminescence (TL) peaks with the same thermal activation energies appeared after VUV as after X- or beta irradiation, indicating that the same traps were induced by the different irradiations. TL excitation spectra in the VUV showed an increase zircon was by an order of magnitude lower than that of TLD-100. The 355 K TL peak showed linear dose dependence only up to approximately 500 Gy and the 520 K peak up to approximately 1800 Gy.

  1. Determination of kinetic parameters in Tl dosemeters of LiF: Mg, Cu, P + PTFE developed in the ININ

    International Nuclear Information System (INIS)

    Basurto G, B.S.

    2002-01-01

    The objective of this work, is the one of determining the kinetic parameters of the dosemeter of LiF: Mg, Cu, P + Ptfe; starting from the curves Tl obtained at being irradiated with alpha radiation (α), beta (β) and gamma (γ). As like to compare its sensitivity with each radiation type, considering the sensitivity of the TLD-100 as the unit. In the Chapter 1, the fundamental structure of the matter is described, making emphasis in the different radiation types, and their interaction with this. In the Chapter 2, the units are described but used in the dosimetry of the radiation. In the Chapter 3, the basic concepts of the phenomenon of Tl are described and those are explained characteristic of the deconvolution method to determine the kinetics of the one phenomenon. In the Chapter 4, the methodology is detailed that was used in the elaboration of this thesis work, describing the material Tl that were considered like reference, as well as the sources of ionizing radiation, with those that the dosemeters were irradiated and the equipment in the one that the curves Tl was obtained. Reference is made to the software used to carry out the deconvolution of the curves Tl that were obtained in the one experimental development. In the Chapter 5, the obtained results of this study are presented, showing the tables of homogenization of dosemeters and the reading of the same one; they are observed the curves Tl obtained to different radiation doses (alpha, beta and gamma), the intensity Tl in function of the dose. Also they are tabulated, the obtained results in the kinetic parameters of the three different study materials (TLD-100H, USA; TLD-100, USA and LiF: Mg, Cu, P + Ptfe developed in the l.N.l.N). They are analyzed shortly for each material Tl their sensitivity to the ionizing radiation as well as their kinetic parameters. The obtained results showed that the Tl dosemeters of LiF: Mg,Cu,P + Ptfe, they presented a bigger sensitivity that the TLD-100 when being

  2. Al2 O3:Cr,Ni: a possible thermoluminescent dosemeter

    International Nuclear Information System (INIS)

    Mariani R, Francisco; Roman B, Alvaro; Saavedra S, Renato; Ibarra S, Angel

    1996-01-01

    Results from a study on the thermoluminescent (Tl) emission from Al 2 O 3 :Cr,Ni are presented. The measurements were obtained for evaluation of the Al 2 O 3 :Cr,Ni dosimetric properties. Different crystal batches were exposed to two kind of ionizing radiation (X-ray and β - ). The Tl spectrum has a main peak with high thermal and optical stability, deviating from linearity for doses lower than 3.6 Gy. Furthermore, this material shows advantages (thermal resistance, reusability, multiple heating cycles) compared to TLD-100. Measured Al 2 O 3 :Cr,Ni properties indicate that it could be used as a dosemeter. (author)

  3. 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)

  4. In vivo thermoluminescent dosimetry on the radiotherapy of limphomas, esophageal and uterine tumour

    International Nuclear Information System (INIS)

    Morales, F.C.

    1982-01-01

    A comparative study between dose distribution in pre-selected tumoral plans was established through measurements with thermoluminescent dosimeters and calculations based on 'scatter-air-ratios' properties, isodose curves and collected data. Clinic dosimetry was performed 'in vivo' with LiF dosimeters (TLD-100) and LiF Teflon (1 mm theta, 6 mm lenght). Patients with Hodgkin's disease, carcinoma of the esophagus and of the uterine cervix were selected. Telecobaltherapy was used for these groups of neoplasic conditions. (M.A.C.) [pt

  5. Breath-hold gadolinium-enhanced three-dimensional MR angiography. Personal experience in the thoracoabdominal district; L'angiografia con risonanza magnetica con gadolinio e sequenza tridimensionale gradient-echo apnea: esperienza personale nel distretto vascolare toraco-addominale

    Energy Technology Data Exchange (ETDEWEB)

    Maspes, F.; Gandini, R.; Pocek, M.; Mazzoleni, C.; Fiaschetti, V.; Ascoli Marchetti, A. [Rome Univ. Tor Vergata, Rome (Italy). Ist. di Radiologia; Pistolese, G.R. [Rome Univ. Tor Vergata, Rome (Italy). Ist. di Chirurgia Vascolare; Simonetti, G.

    1999-10-01

    The principal aim of this report is to investigate different clinical applications of gadolinium-enhanced MR angiography (Gd MRA) using three-dimensional breath-hold GE sequences, without bolus time calculation, in patients with vascular diseases. [Italian] Obiettivo principale di questo studio e' valutare diverse applicazion cliniche dell'angiografia con RM tridimensionale con dagolinio nei pazienti affetti da malattie vascolari utlizzando una sequenza tridimensionale gradient-echo (GE) apnea respiratoria senza calcolo del tempo di circolo e impiegando alte dosi di gadolinio.

  6. La Articulación De Lógicas Laborales Y Lógicas Domésticas En Una Política De Empleo Para Jóvenes En Argentina. Individuo, Autonomía Y Vínculos Personales En El Mundo Del Trabajo

    Directory of Open Access Journals (Sweden)

    Alicia Gutiérrez

    2015-08-01

    Full Text Available This paper analyzes the main youth employment policy in Argentina: the Youth with More and Better Work program. Based on the paradigm of active employment policies, this program illustrates a new form of management and state regulation regarding the problematic question of employment among the poorer sectors of the population. For our analysis, we begin by exploring the theoretical possibilities opened up by Foucault's notion of the “device,” and then point out some disarray concerning the logics, the division between "domestic" and "work" areas, and models of person (individual or linked that this policy seeks to impose in the labor practices and trajectories of young people in low-income sectors. Finally, we note the need to incorporate the notion of "instruments of reproduction" and "social capital" to account for the singular character of the practical logic these young people apply in order to enter into and to be in the world of work.

  7. Evaluación del uso de los servicios in situ de las bibliotecas de barrio: un estudio a nivel nacional de usuarios de minorías étnicas y mayorías blancas de bajos ingresos usando instrumentos personales de recogida de datos

    Directory of Open Access Journals (Sweden)

    Christie M. Koontz

    2006-01-01

    Full Text Available La costumbre de presentar los datos totales sobre el uso de la biblioteca a nivel de todo un sistema bibliotecario (es decir, incluyendo tanto la biblioteca central como las sucursales puede enmascarar las necesidades de los grupos de usua-rios más específicos. Este artículo presenta un estudio que intenta resolver este problema identificando las bibliotecas que sirven a minorías étnicas o a mayorías de raza blanca con bajos ingresos y examinando estas poblaciones para evaluar tipos y niveles de uso. Este estudio es muy importante para la investigación y práctica diaria de las bibliotecas por estas razones: (1 incremento de la diversidad de razas/etnias y lenguas habladas en los Estados Unidos, (2 bajos índices de préstamo agravados por el uso de Internet, (3 la mera existencia de una biblioteca es vital para fomentar el uso por poblaciones sin una tradición bibliotecaria o hábito de lectura y (4 la reciente publicación de la Base de Datos Geográfica de las Bibliotecas Públicas con datos sobre el uso de las bibliotecas y del censo demográfico a nivel de barrios para todos los sistemas bibliotecarios estadou-nidenses. Las metodologías desarrolladas ofrecen posibilidades para la colección de datos importantes para el bibliotecario de hoy día

  8. La Articulación De Lógicas Laborales Y Lógicas Domésticas En Una Política De Empleo Para Jóvenes En Argentina. Individuo, Autonomía Y Vínculos Personales En El Mundo Del Trabajo

    OpenAIRE

    Alicia Gutiérrez; Gonzalo Assusa

    2015-01-01

    This paper analyzes the main youth employment policy in Argentina: the Youth with More and Better Work program. Based on the paradigm of active employment policies, this program illustrates a new form of management and state regulation regarding the problematic question of employment among the poorer sectors of the population. For our analysis, we begin by exploring the theoretical possibilities opened up by Foucault's notion of the “device,” and then point out some disarray concerning th...

  9. Narrativas personales, construcción de masculinidades: aportaciones para la atención psicosocial a hombres autores de violencia = Narrativas pessoais, construções de masculinidades: contribuições para a atenção psicosocial a homens autores de violência

    Directory of Open Access Journals (Sweden)

    Beiras, Adriano

    2012-01-01

    Full Text Available Este texto se deriva de um estudo sobre a relação entre subjetividade, masculinidades e violência. Faz uma reflexão sobre o processo de construção e deconstrução da subjetividade de homens autores de violência contra mulheres. Os dados foram obtidos através de observação participante de um processo grupal terapêutico e entrevistas com os participantes deste grupo. A organização dos dados foi realizada tomando por base a teoria fundamentada e a análise a partir dos estudos de narrativas. Este artigo está centrado na análise narrativa de um dos participantes desta pesquisa maior, de forma a se obter uma análise aprofundada de sua narrativa e pensar questões direcionadas à atenção psicosocial individual ou grupal a estes homens. Os resultados mostram as interconexões da construção social da subjetividade masculina com atos de violência, referenciam particularidades e estratégias importantes para a melhor eficácia de intervenções neste setor

  10. Carácter jurisdiccional de las resoluciones de la Dirección General del Registro Electoral en materia de faltas electorales: especial referencia a la facultad de recabar datos personales protegidos por el secreto bancario o tributario en el marco de una investigación por faltas en materia de financiamiento de los partidos políticos

    Directory of Open Access Journals (Sweden)

    Ruy López González

    2011-01-01

    Full Text Available El artículo aborda el concepto y características distintivas de la función jurisdiccional del Estado. Con este marco teórico se analiza la función jurisdiccional del Tribunal Supremo de Elecciones en materia electoral y se esboza como tesis la delegación legislativa de competencias jurisdiccionales que operó a favor de la Dirección General del Registro Electoral y de Financiamiento de Partidos Políticos en el trámite y sanción de las faltas electorales tipificadas en el nuevo Código Electoral. Bajo esta premisa, se infiere la facultad de la Dirección de recabar pruebas que contengan datos de carácter confidencial protegidos bajo los institutos del secreto bancario o tributario con el objeto de ejercer su competencia sancionadora

  11. Assessment of dose in thyroid and salivary glands in dental radiology using thermoluminescent dosimetry

    International Nuclear Information System (INIS)

    Mantuano, Natalia de O.; Silva, Ademir X. da; Correa, Samanda C.A.

    2011-01-01

    Radiobiological and epidemiological studies have provided evidence of risk of salivary and thyroid glands tumors incidence associated with oral radiology. Based on these studies, the tissue weighting factors were reviewed by the International Commission on Radiological Protection (ICRP) in 2007. The main objective of the present work is to estimate the absorbed dose on thyroid and salivary glands (parotid, submandibular and sublingual), during a complete periapical examination. The complete periapical examination was simulated using a Spectro 70X Seletronic X-ray dental equipment on an Alderson Rando phantom with Harshaw LiF:Mg,Ti thermoluminescent dosemeters (TLD100). A PTW DIADOS dosimetric system was used for calibration. The TLD100 were inserted into the phantom slices corresponding to the organs of interest. During a complete periapical examination, the highest evaluated mean absorbed dose was 4.9 mGy in the right submandibular gland and the lowest one of 1.5 mGy in the left thyroid lobe. Entrance surface doses ranged from 2.1 to 2.6 mGy, measured, respectively, for the techniques of upper left molar and lower right molar. When compared with the diagnostic reference levels (DRL), the entrance surface doses values were lower than the DRLs recommended in Brazilian current legislation. However, the dosimetric results show the need of optimization for complete periapical examination to minimize patient exposure. Measurements were performed without the use of thyroid protectors. The use of this device is certainly an easy and simple method of dose reduction. (author)

  12. Assessment of dose in thyroid and salivary glands in dental radiology using thermoluminescent dosimetry

    Energy Technology Data Exchange (ETDEWEB)

    Mantuano, Natalia de O.; Silva, Ademir X. da [Instituto Alberto Luiz Coimbra de Pos-Graduacao e Pesquisa em Engenharia (PEN/COPPE/UFRJ), RJ (Brazil). Programa de Engenharia Nuclear; Canevaro, Luca V.; Mauricio, Claudia Lucia P. [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ) Rio de Janeiro, RJ (Brazil); Correa, Samanda C.A., E-mail: scorrea@cnen.gov.b [Comissao Nacional de Energia Nuclear (CNEN), Rio de Janeiro, RJ (Brazil)

    2011-07-01

    Radiobiological and epidemiological studies have provided evidence of risk of salivary and thyroid glands tumors incidence associated with oral radiology. Based on these studies, the tissue weighting factors were reviewed by the International Commission on Radiological Protection (ICRP) in 2007. The main objective of the present work is to estimate the absorbed dose on thyroid and salivary glands (parotid, submandibular and sublingual), during a complete periapical examination. The complete periapical examination was simulated using a Spectro 70X Seletronic X-ray dental equipment on an Alderson Rando phantom with Harshaw LiF:Mg,Ti thermoluminescent dosemeters (TLD100). A PTW DIADOS dosimetric system was used for calibration. The TLD100 were inserted into the phantom slices corresponding to the organs of interest. During a complete periapical examination, the highest evaluated mean absorbed dose was 4.9 mGy in the right submandibular gland and the lowest one of 1.5 mGy in the left thyroid lobe. Entrance surface doses ranged from 2.1 to 2.6 mGy, measured, respectively, for the techniques of upper left molar and lower right molar. When compared with the diagnostic reference levels (DRL), the entrance surface doses values were lower than the DRLs recommended in Brazilian current legislation. However, the dosimetric results show the need of optimization for complete periapical examination to minimize patient exposure. Measurements were performed without the use of thyroid protectors. The use of this device is certainly an easy and simple method of dose reduction. (author)

  13. Absorbed doses to patients from angioradiology

    International Nuclear Information System (INIS)

    Rodriguez-Romero, R.; Hernandez-Armas, J.; Diaz-Romero, F.

    2001-01-01

    The aim of study was to know patients doses exposes when three different procedures of angioradiology were carried out. The explorations considered were drainage biliary, varicocele embolization and dacriocistography made in the Radiodiagnostic Service at the University Hospital of Canary Islands, Tenerife (Spain). In total 14 patients were studied. The measurements were made using large area transmission ionisation chamber which gives the values of Dose Area Product (DAP). In addition, thermoluminescent dosimeters type TLD-100 were used in anthropomorphic phantom in order to obtain values of organ doses when the phantom was submitted to the same procedures rather than the actual patients. Furthermore, the Effdose program was used to estimate the effective doses in the procedures conditions. The values for DAP were in the range of 70-300 for drainage biliary, 43-180 for varicocele embolization and 1.4-9 for dacriocistography. The organ doses measured with TLD-100 were higher than the corresponding values estimated by Effdose program. The results for varicocele embolization were higher than other published data. In the case of drainage biliary procedure, the values were closed to other published results. It was not possible to find data for dacriocistography from other authors. (author)

  14. Dosimetric comparison on tissue interfaces with TLD dosimeters, L-alanine, EDR2 films and Penelope simulation for a Co-60 source and linear accelerator in radiotherapy

    International Nuclear Information System (INIS)

    Vega R, J. L.; Cayllahua, F.; Apaza, D. G.; Javier, H.

    2015-10-01

    Percentage depth dose curves were obtained with TLD-100 dosimeters, EDR2 films and Penelope simulation at the interfaces in an inhomogeneous mannequin, composed by equivalent materials to the human body built for this study, consisting of cylindrical plates of solid water-bone-lung-bone-solid water of 15 cm in diameter and 1 cm in height; plates were placed in descending way (4-2-8-2-4). Irradiated with Co-60 source (Theratron Equinox-100) for small radiation fields 3 x 3 cm 2 and 1 x 1 cm 2 at a surface source distance of 100 cm from mannequin. The TLD-100 dosimeters were placed in the center of each plate of mannequin irradiated at 10 Gy. The results were compared between these measurement techniques, giving good agreement in interfaces better than 97%. This study was compared with the same characteristics of another study realized with other equivalent materials to human body not homogeneous acrylic-bone-cork-bone-acrylic. The percentage depth dose curves were obtained with mini-dosimeters L-alanine of 1 mm in diameter and 3 mm in height and 3.5 to 4.0 mg of mass with spectrometer band K (EPR). The mini-dosimeters were irradiated with a lineal accelerator PRIMUS Siemens 6 MV. The results of percentage depth dose of L-alanine mini-dosimeters show a good agreement with the percentage depth dose curves of Penelope code, better than 97.7% in interfaces of tissues. (Author)

  15. Dose measurements using thermoluminescent dosimeters and DoseCal software at two paediatric hospitals in Rio de Janeiro

    Energy Technology Data Exchange (ETDEWEB)

    Mohamadain, K.E.M.; Azevedo, A.C.P.; Rosa, L.A.R. da E-mail: lrosa@ird.gov.br; Guebel, M.R.N.; Boechat, M.C.B

    2003-07-01

    A dosimetric survey in paediatric radiology is currently being carried out at the paediatric units of two large hospitals in Rio de Janeiro city: IPPMG (Instituto de Pediatria e Puericultura Martagao Gesteira, University Hospital of Federal University of Rio de Janeiro) and IFF (Instituto Fernandes Figueira, FIOCRUZ). Chest X-ray examination doses for AP, PA and LAT projections of paediatric patients have been obtained with thermoluminescent dosimeters (TLDs) and with use of a software package DoseCal. In IPPMG and IFF 100 patients have been evaluated with the use of the TLDs and another group of 100 patients with the DoseCal software. The aim of this work was to estimate the entrance skin dose (ESD) for frontal, back and lateral chest X-rays exposure of paediatric patients. For ESD evaluation, three different TL dosimeters have been used, namely LIF:Mg, Ti (TLD100), CaSO{sub 4}:Dy and LiF:Mg, Cu, P (TLD100H). The age intervals considered were 0-1, 1-5, 5-10 and 10-15 years. The results obtained with all dosimeters are similar, and it is in good agreement with the DoseCal software, especially for AP and PA projections. However, some larger discrepancies are presented for the LAT projection.

  16. A study into the mechanism of thermoluminescence in a LiF:Mg,Ti dosimetry material

    Energy Technology Data Exchange (ETDEWEB)

    Piters, T.M.

    1993-10-11

    Thermoluminescence (TL) is the phenomenon of light emission from an insulator or semiconductor when it is heated after a previous absorption of energy from ionising radiation. The purpose of the research described in this thesis is to get more insight into the mechanism of TL in LiF:Mg, Ti. In chapter 2 the idea of defect reactions during the readout is introduced as a possible explanation for the dependence of the read-out heating rate on TL. In chapter 3 a mode for the description of the emission band is described. The construction of a TL facility comprising the TL emission spectrometer is described in chapter 4. Chapter 5 gives an estimation for the possible errors that are made in the data analysis due to imperfect heat transfer from heater to sample. In chapter 6 results of measurements of TL emission spectra of a LiF:Mg, Ti (TLD-100) sample and three LiF:Mg, Ti samples with different impurity concentrations (0-6 ppm Ti and 80-100 ppm Mg) at different read out, annealing procedure and irradiation dose are described. At dose levels less than 22 Gy the emission spectra of the TLD-100 sample and the sample without Ti comprise one emission band at 420 nm and 620 nm, respectively. The TL emission spectra of the other two samples comprise two emission bands at 420 nm and 620 nm. (orig./MM).

  17. Thermoluminescent dosimeters for exposure assessment in gamma or x radiation fields with unknown spectral distribution

    International Nuclear Information System (INIS)

    Da Rosa, L.A.R.; Nette, H.P.

    1988-01-01

    The determination of the effective energy of a radiation field using the energy dependence of the response ratio of two dosimeters with different energy dependences is called the Tandem Method. Having in view the choice of the best pair of dosimeters to be used, the energy response characteristics of LiF:Mg, Ti; CaSO 4 :Dy; CaF 2 :Dy and CaF 2 Mn thermoluminescent (TL) dosimeters were studied. Two different physical forms of TL dosimeters were investigated: hot pressed chips and Teflon disc dosimeters. The calibration factors were obtained for the energy of 60 Co γ rays and their energy dependence, normalized to 60 Co γ-radiation, was determined using spectral width as a parameter. Tandem systems formed by all LT dosimeters evaluated were compared. It was concluded that the Tandem D-CaSO 4 :Dy-0.4/LiF:Mg, Ti(TLD-100) determines the effective energy with a maximum uncertainty of only 10 keV and permits the assessment of the energy correction factor for the TLD-100 with a precision of better than 1.7% for the spectral distribution studied in the effective energy range from 30 to 100 keV. (author)

  18. Thermoluminescence dosimetry properties and kinetic parameters of lithium potassium borate glass co-doped with titanium and magnesium oxides

    International Nuclear Information System (INIS)

    Hashim, S.; Alajerami, Y.S.M.; Ramli, A.T.; Ghoshal, S.K.; Saleh, M.A.; Abdul Kadir, A.B.; Saripan, M.I.; Alzimami, K.; Bradley, D.A.; Mhareb, M.H.A.

    2014-01-01

    Lithium potassium borate (LKB) glasses co-doped with TiO 2 and MgO were prepared using the melt quenching technique. The glasses were cut into transparent chips and exposed to gamma rays of 60 Co to study their thermoluminescence (TL) properties. The TL glow curve of the Ti-doped material featured a single prominent peak at 230 °C. Additional incorporation of MgO as a co-activator enhanced the TL intensity threefold. LKB:Ti,Mg is a low-Z material (Z eff =8.89) with slow signal fading. Its radiation sensitivity is 12 times lower that the sensitivity of TLD-100. The dose response is linear at doses up to 10 3 Gy. The trap parameters, such as the kinetics order, activation energy, and frequency factor, which are related to the glow peak, were determined using TolAnal software. - Highlights: • Lithium potassium borate glass doped with Ti and Mg was prepared. • The material is close to soft tissues in terms of Zeff. • The radiation sensitivity is about 12 times lower than that of TLD-100. • The signal fades about 8% in 10 days and 17% in 3 months

  19. Assessment of CaSO{sub 4}:Dy and LiF:Mg,Ti thermoluminescent dosimeters performance in the dosimetry of clinical electron beams; Avaliacao do desempenho dos detectores termoluminesncetes de CaSO{sub 4}:Dy e LiF:Mg,Ti na dosimetria de feixes clinicos de eletrons

    Energy Technology Data Exchange (ETDEWEB)

    Nunes, Maira Goes

    2008-07-01

    The assessment of the performance of CaS0{sub 4}:Dy thermoluminescent detectors produced by IPEN in the dosimetry of clinical electron beams aims to propose an alternative to the LiF:Mg,Ti commercial dosimeters (TLD-100) largely applied in radiation therapy. The two types of thermoluminescent dosimeters were characterised with the use of PMMA, RMI-457 type solid water and water phantoms in radiation fields of 4, 6, 9, 12 and 16 MeV electrons of nominal energies in which the dose-response curves were obtained and the surface and depth doses were determined. The thermoluminescent response dependency with the electron nominal energies and the applied phantom were studied. The CaS0{sub 4}:Dy presented the same behaviour than the LiF:Mg,Ti in such a way that its application as an alternative to the TLD-100 pellets in the radiation therapy dosimetry of electron beams is viable and presents the significantly higher sensitivity to the electron radiation as its main advantage. (author)

  20. Evaluation of thermoluminescent dosimeters using water equivalent phantoms for application in clinical electrons beams dosimetry

    International Nuclear Information System (INIS)

    Bravim, Amanda

    2010-01-01

    The dosimetry in Radiotherapy provides the calibration of the radiation beam as well as the quality control of the dose in the clinical routine. Its main objective is to determine with greater accuracy the dose absorbed by the tumor. This study aimed to evaluate the behavior of three thermoluminescent dosimeters for the clinical electron beam dosimetry. The performance of the calcium sulfate detector doped with dysprosium (CaSO 4 : Dy) produced by IPEN was compared with two dosimeters commercially available by Harshaw. Both are named TLD-100, however they differ in their dimensions. The dosimeters were evaluated using water, solid water (RMI-457) and PMMA phantoms in different exposure fields for 4, 6, 9, 12 and 16 MeV electron beam energies. It was also performed measurements in photon beams of 6 and 15 MV (2 and 5 MeV) only for comparison. The dose-response curves were obtained for the 60 Co gamma radiation in air and under conditions of electronic equilibrium, both for clinical beam of photons and electrons in maximum dose depths. The sensitivity, reproducibility, intrinsic efficiency and energy dependence response of dosimeters were studied. The CaSO 4 : Dy showed the same behavior of TLD-100, demonstrating only an advantage in the sensitivity to the beams and radiation doses studied. Thus, the dosimeter produced by IPEN can be considered a new alternative for dosimetry in Radiotherapy departments. (author)

  1. Assessment of CaSO4:Dy and LiF:Mg,Ti thermoluminescent dosimeters performance in the dosimetry of clinical electron beams

    International Nuclear Information System (INIS)

    Nunes, Maira Goes

    2008-01-01

    The assessment of the performance of CaS0 4 :Dy thermoluminescent detectors produced by IPEN in the dosimetry of clinical electron beams aims to propose an alternative to the LiF:Mg,Ti commercial dosimeters (TLD-100) largely applied in radiation therapy. The two types of thermoluminescent dosimeters were characterised with the use of PMMA, RMI-457 type solid water and water phantoms in radiation fields of 4, 6, 9, 12 and 16 MeV electrons of nominal energies in which the dose-response curves were obtained and the surface and depth doses were determined. The thermoluminescent response dependency with the electron nominal energies and the applied phantom were studied. The CaS0 4 :Dy presented the same behaviour than the LiF:Mg,Ti in such a way that its application as an alternative to the TLD-100 pellets in the radiation therapy dosimetry of electron beams is viable and presents the significantly higher sensitivity to the electron radiation as its main advantage. (author)

  2. Effect of thermal treatment on TL response of CaSO4:Dy obtained using a new preparation method

    International Nuclear Information System (INIS)

    González, P.R.; Cruz-Zaragoza, E.; Furetta, C.; Azorín, J.; Alcántara, B.C.

    2013-01-01

    We report the effect of thermal treatment on thermoluminescent (TL) sensitivity property of CaSO 4 :Dy obtained by a new preparation method at Instituto Nacional de Investigaciones Nucleares (ININ) of Mexico. Samples of phosphor powder were subjected to different thermal treatments respectively at 773, 873, 973 and 1173 K for 1 h and then irradiated from 0.1 to 1000 Gy gamma doses. Low energy dependence was analyzed too by irradiating with X-rays in the range of 16–145 keV. The results were normalized to the energy (1252 keV) of 60 Co and they were compared with those obtained using the commercial dosimeters TLD-100. Also the kinetic parameters were determined by deconvolution of glow curve. - Highlights: ► A new preparation method to obtain the CaSO 4 :Dy is presented. ► Effect of thermal treatment (773–1173 K) on the TL response of the phosphor and their dosimetric property are reported. ► TL intensity of new CaSO 4 :Dy was 32 times more higher than the TLD-100 dosimeter. ► The TL response of CaSO 4 :Dy as a function of photon energy agrees well with the calculated Z eff value. ► The kinetic parameters were analyzed by using the deconvolution method

  3. Statistical differences and systematic effect on measurement procedure in thermoluminescent dosimetry of the Iodine-125 brachytherapy seed

    Energy Technology Data Exchange (ETDEWEB)

    Zeituni, Carlos A.; Moura, Eduardo S.; Rostelato, Maria Elisa C.M.; Manzoli, Jose E.; Moura, Joao Augusto; Feher, Anselmo, E-mail: czeituni@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP) Sao Paulo, SP (Brazil); Karam, Dib [Universidade de Sao Paulo (USP Leste), Sao Paulo, SP (Brazil). Escola de Artes, Ciencias e Humanidades

    2009-07-01

    In order to provide the dosimetry for Iodine-125 seed production in Brazil, Harshaw thermoluminescent dosimeters (TLD-100) will be used. Even if measurements with TLD-100 of the same batch of fabrication are performed, the response will not be the same. As a consequence, they must be measured one by one. These dosimeters are LiF type with a micro-cube (1 mm x 1 mm x 1 mm) shape. Irradiations were performed using Iodine-125 seeds to guarantee the same absorbed dose of 5 Gy in each dosimeter. It has been used a Solid Water Phantom with three concentrically circle with 20 mm, 50 mm and 70 mm diameters. The angle of positions used was 0 deg, 30 deg, 60 deg and 90 deg. Of course there are 2 positions in 0 deg and 90 deg and 4 positions in 30 deg and 60 deg. These complete procedures were carried out five times in order to compare the data and minimize the systematic error. The iodine-125 seed used in the experiment was take off in each measure and put again turning his position 180 deg to guarantee the systematic error was minimized. This paper presents also a little discussion about the statistical difference in the measurement and the calculation procedure to determine the systematic error in these measurements. (author)

  4. de Jaén, España

    Directory of Open Access Journals (Sweden)

    Carmen Egea Jiménez

    2005-01-01

    (personales y no personales, por medio de los cuales los emigrados toman la decisión de regresar. Esta pluralidad de circunstancias dificulta el ejercicio de discernir cuál de ellas actúa como determinante en la decisión del regreso.

  5. Kommunepakken - Forebyggelse af selvmordsforebyggelse hos børn og unge

    DEFF Research Database (Denmark)

    Juul Larsen, Kim

    2006-01-01

    Kommunepakken - en vejledning til personale i socialsektoren Statistikken viser, at flere unge piger og drenge mellem 15 og 19 år forsøger at tage deres eget liv. For sagsbehandleren eller andet personale i den sociale sektor, som sidder over for et selvmordstruet barn eller ung, kan det skabe us...

  6. Thermoluminescence characteristics of Ge-doped optical fibers with different dimensions for radiation dosimetry

    International Nuclear Information System (INIS)

    Begum, Mahfuza; Rahman, A.K.M. Mizanur; Abdul-Rashid, H.A.; Yusoff, Z.; Begum, Mahbuba; Mat-Sharif, K.A.; Amin, Y.M.; Bradley, D.A.

    2015-01-01

    Important thermoluminescence (TL) properties of five (5) different core sizes Ge-doped optical fibers have been studied to develop new TL material with better response. These are drawn from same preform applying different speed and tension during drawing phase to produce Ge-doped optical fibers with five (5) different core sizes. The results of the investigations are also compared with most commonly used standard TLD-100 chips (LiF:Mg,Ti) and commercial multimode Ge-doped optical fiber (Yangtze Optical Fiber, China). Scanning Electron Microscope (SEM) and EDX analysis of the fibers are also performed to map Ge distribution across the deposited region. Standard Gamma radiation source in Secondary Standard Dosimetry Lab (SSDL) was used for irradiation covering dose range from 1 Gy to 10 Gy. The essential dosimetric parameters that have been studied are TL linearity, reproducibility and fading. Prior to irradiation all samples ∼0.5 cm length are annealed at temperature of 400 °C for 1 h period to standardize their sensitivities and background. Standard TLD-100 chips are also annealed for 1 h at 400 °C and subsequently 2 h at 100 °C to yield the highest sensitivity. TL responses of these fibers show linearity over a wide gamma radiation dose that is an important property for radiation dosimetry. Among all fibers used in this study, 100 μm core diameter fiber provides highest response that is 2.6 times than that of smallest core (20 μm core) optical fiber. These fiber-samples demonstrate better response than commercial multi-mode optical fiber and also provide low degree of fading about 20% over a period of fifteen days for gamma radiation. Effective atomic number (Z eff ) is found in the range (13.25–13.69) which is higher than soft tissue (7.5) however within the range of human-bone (11.6–13.8). All the fibers can also be re-used several times as a detector after annealing. TL properties of the Ge-doped optical fibers indicate promising applications in

  7. Dose in conventional radiography; Dosis en radiografia convencional

    Energy Technology Data Exchange (ETDEWEB)

    Acuna D, E.; Padilla R, Z. P.; Escareno J, E.; Vega C, H. R. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Calle Cipres No. 10, Fracc. La Penuela, 98000 Zacatecas (Mexico)

    2011-10-15

    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)

  8. Dose evaluation in diagnostic for computerized tomography; Evaluacion de dosis en diagnostico por tomografia computarizada

    Energy Technology Data Exchange (ETDEWEB)

    Flores, W.; Borges, J.C.; Mota, H. [Universidad Federal de Rio de Janeiro, PEN/COPPE/UFRJ. Caixa Postal 68509. 21945-970 Rio de Janeiro (Brazil)

    1998-12-31

    The patients which are subjected to computerized tomography tests are exposed to relatively high doses given as result doses on organs that are not matter to test. It was realized a dose levels raising in patients subjected to tests by T C, utilizing to measure this magnitude, TLD-100 thermoluminescent dosemeters which were put directly on the patient, in eye regions, thyroid, breast and navel; founding doses fluctuating between 29.10-49.39 mGy in organs examined and dose values between 0.21-29.10 mGy for organs that no matter to test. The applications of ionizing radiations in medicine do not have dose limits, but paying attention to the radiological protection optimization principle, it is recommended the use of clothes to anti-rays protection for zones not examined, getting with this to reduce the level doses as low as possible, without this to diminish the test quality. (Author)

  9. Dosimetric characterization of a Tl new material of LiF: Mg, Cu, P

    International Nuclear Information System (INIS)

    Gonzalez, P.R.; Avila, O.; Quiroz, C.; Azorin, J.

    2004-01-01

    In this work the method of preparation of a new material T L is described of LiF: Mg, Cu, P and the preliminary results of the tests corresponding to their dosimetric characterization are reported. The carried out tests were: detection threshold, sensitivity, dissipation of the sign T L, answer T L in function of the dose of radiation gamma, among others. The results showed that this material when receiving the one thermal treatment of having erased of 280 C by 10 min, followed by 100 C for two hours, he/she has a detection threshold ten times but I lower that that of the TLD-100, is 21 times but sensitive that that of reference and the dissipation of the sign T L during two months was null. This new material T L overcomes in many aspects to the commercial dosemeters of its type. (Author)

  10. Ambient radiation levels in positron emission tomography/computed tomography (PET/CT) imaging center

    Energy Technology Data Exchange (ETDEWEB)

    Santana, Priscila do Carmo; Oliveira, Paulo Marcio Campos de; Mamede, Marcelo; Silveira, Mariana de Castro; Aguiar, Polyanna; Real, Raphaela Vila, E-mail: pridili@gmail.com [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil); Silva, Teogenes Augusto da [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)

    2015-01-15

    Objective: to evaluate the level of ambient radiation in a PET/CT center. Materials and methods: previously selected and calibrated TLD-100H thermoluminescent dosimeters were utilized to measure room radiation levels. During 32 days, the detectors were placed in several strategically selected points inside the PET/CT center and in adjacent buildings. After the exposure period the dosimeters were collected and processed to determine the radiation level. Results: in none of the points selected for measurements the values exceeded the radiation dose threshold for controlled area (5 mSv/ year) or free area (0.5 mSv/year) as recommended by the Brazilian regulations. Conclusion: in the present study the authors demonstrated that the whole shielding system is appropriate and, consequently, the workers are exposed to doses below the threshold established by Brazilian standards, provided the radiation protection standards are followed. (author)

  11. Dosimetry of patients submitted to cerebral PET/CT for the diagnosis of mild cognitive impairment

    International Nuclear Information System (INIS)

    Santana, Priscila do Carmo; Oliveira, Paulo Marcio Campos de; Bernardes, Felipe Dias; Mamede, Marcelo; Mourao, Arnaldo Prata; Silva, Teogenes Augusto da

    2014-01-01

    Objective: the present study was aimed at evaluating the effective radiation dose in patients submitted to PET/CT for the diagnosis of mild cognitive impairment. Materials and methods: TLD-100 detectors inserted into an Alderson Rando® anthropomorphic phantom were utilized to measure the absorbed dose coming from the CT imaging modality. The anthropomorphic phantoms (male and female adult versions) were submitted to the same technical protocols for patients’ images acquisition. The absorbed dose resulting from the radiopharmaceutical injection was estimated by means of the model proposed by the ICRP publication 106. Results: the effective dose in patients submitted to this diagnostic technique was approximately (5.34 ± 1.99) mSv. Conclusion: optimized protocols for calculation of radioactive activity injected into patients submitted to this diagnostic technique might contribute to reduce the effective radiation dose resulting from PET/CT in the diagnosis of mild cognitive impairment. (author)

  12. Estimate of the exposition to the ionizing radiation of the medical veterinarians and its assistants in radiology examinations veterinary medicine

    International Nuclear Information System (INIS)

    Lima, G.; Braz, D.; Lopez, R.; Mauricia, C.; Barroso, R.

    2006-01-01

    The absorbed ionizing radiation outside of the permissible limits, can cause biological damages e, therefore it must necessarily be monitored. The dosimetry thermoluminescent is a technique very used to detect expositions in operators, therefore they are sensible crystals the ionizing radiation and allows to evaluate if the dose of radiation is or not below of the restriction levels. In scientific literature many information do not exist on the exposition of a medical veterinarian, with this do not have many data of the individual monitoring of these workers, becoming the work it important for posterior studies. Ahead of this, it was carried through measured of the doses, using the thermoluminescence dosemeters LiF: Mg, Cu, P (TLD-100 H) in the position of the crystalline lens, thyroid, hand and thorax, in three clinics of radiology veterinary medicine, different, having the objective to determine the dose distribution that the workers of radiology veterinary medicine are submitted in one day of work. (authors)

  13. Thermoluminescent dosemeter in a X-ray diffractometer

    International Nuclear Information System (INIS)

    Mendoza A, D.; Gonzalez M, P.; Falcon B, T.; Castano, V.M.

    1999-01-01

    In this work it was presented the results obtained of the dosimetry which was realized in a X-ray diffractometer for powders, trademark Siemens D5000, using the thermoluminescent signal generated by the X-rays in the commercial dosemeter TLD-100 of Harshaw, US. In according to the results obtained, the radiation quantity received by an analysed material in the diffractometer, will be proportional to exposure time and it can vary from unities until tenths of grays. These results are very outstanding when are analysed crystalline materials in a diffractometer, for knowing the present crystalline phases, mainly if these are highly sensitive to the ionizing radiation, as it is the case of the thermoluminescent materials. (Author)

  14. Dose evaluation in diagnostic for computerized tomography

    International Nuclear Information System (INIS)

    Flores, W.; Borges, J.C.; Mota, H.

    1998-01-01

    The patients which are subjected to computerized tomography tests are exposed to relatively high doses given as result doses on organs that are not matter to test. It was realized a dose levels raising in patients subjected to tests by T C, utilizing to measure this magnitude, TLD-100 thermoluminescent dosemeters which were put directly on the patient, in eye regions, thyroid, breast and navel; founding doses fluctuating between 29.10-49.39 mGy in organs examined and dose values between 0.21-29.10 mGy for organs that no matter to test. The applications of ionizing radiations in medicine do not have dose limits, but paying attention to the radiological protection optimization principle, it is recommended the use of clothes to anti-rays protection for zones not examined, getting with this to reduce the level doses as low as possible, without this to diminish the test quality. (Author)

  15. Pilot Quality Control Program for Audit RT External Beams at Mexican Hospitals

    International Nuclear Information System (INIS)

    Alvarez R, J T; Tovar M, V M

    2008-01-01

    A pilot quality control program for audit 18 radiotherapy RT external beams at 13 Mexican hospitals is described--for eleven 60 Co beams and seven photon beams of 6, 10 and 15 MV from accelerators. This program contains five parts: a) Preparation of the TLD-100 powder: washing, drying and annealing (one hour 400 deg. C plus 24 hrs 80 deg. C). b) Sending two IAEA type capsules to the hospitals for irradiation at the hospital to a nominal D W = 2 Gy·c) Preparation at the SSDL of ten calibration curves CC in the range of 0.5 Gy to 6 Gy in terms of absorbed dose to water D W for 60 Co with traceability to primary laboratory NRC (Canada), according to a window irradiation: 26/10/2007-7/12/2007. d) Reading all capsules that match their hospital time irradiation and the SSDL window irradiation. f) Evaluation of the Dw imparted by the hospitals

  16. Pilot Quality Control Program for Audit RT External Beams at Mexican Hospitals

    Science.gov (United States)

    Álvarez R., J. T.; Tovar M., V. M.

    2008-08-01

    A pilot quality control program for audit 18 radiotherapy RT external beams at 13 Mexican hospitals is described—for eleven 60 Co beams and seven photon beams of 6, 10 and 15 MV from accelerators. This program contains five parts: a) Preparation of the TLD-100 powder: washing, drying and annealing (one hour 400 °C plus 24 hrs 80 °C). b) Sending two IAEA type capsules to the hospitals for irradiation at the hospital to a nominal DW = 2 Gy ṡ c ) Preparation at the SSDL of ten calibration curves CC in the range of 0.5 Gy to 6 Gy in terms of absorbed dose to water DW for 60 Co with traceability to primary laboratory NRC (Canada), according to a window irradiation: 26/10/2007-7/12/2007. d) Reading all capsules that match their hospital time irradiation and the SSDL window irradiation. f) Evaluation of the Dw imparted by the hospitals.

  17. Dosimetric characterization of a Tl new material of LiF: Mg, Cu, P; Caracterizacion dosimetrica de un nuevo material TL de LiF: Mg, Cu, P

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez, P.R.; Avila, O. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Quiroz, C. [UAEM, Facultad de Medicina, 50180, Toluca, Estado de Mexico (Mexico); Azorin, J. [UAM-I, 09340 Mexico D.F. (Mexico)

    2004-07-01

    In this work the method of preparation of a new material T L is described of LiF: Mg, Cu, P and the preliminary results of the tests corresponding to their dosimetric characterization are reported. The carried out tests were: detection threshold, sensitivity, dissipation of the sign T L, answer T L in function of the dose of radiation gamma, among others. The results showed that this material when receiving the one thermal treatment of having erased of 280 C by 10 min, followed by 100 C for two hours, he/she has a detection threshold ten times but I lower that that of the TLD-100, is 21 times but sensitive that that of reference and the dissipation of the sign T L during two months was null. This new material T L overcomes in many aspects to the commercial dosemeters of its type. (Author)

  18. Effective energies and exposure determinations of two different energy X-ray beams incident on a personnel monitor

    International Nuclear Information System (INIS)

    Okuno, E.; Cruz, M.T. da

    1984-01-01

    The effective energy of one X or gamma ray beam can be determined by means of two thermoluminescent (TL) dosemeters mounted between suitable filters. However, it has been observed that personnel monitors exposed to two different energy ionizing radiations provide different effective energies depeding on the type of TL phosphor used. This fact could be a powerful tool for identifying exposures to radiation with quite different effective energies which are very common in practice. Two types of TL dosemeters were used : pellets of cold pressed natural fluoride and NaCl developed in our own laboratory, and LiF, TLD-100 from Harshaw Chemical Co.. Experimental results obtained with these combined dosemeters after irradiation with different sets of exposures and energy values of ionizing radiations are also presented. (Author) [pt

  19. 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)

  20. Environmental dose in the Nuclear Medicine Department of the National Institute of Cancer

    International Nuclear Information System (INIS)

    Torres U, C. L.; Avila A, O. L.; Medina V, L. A.; Buenfil B, A. E.; Brandan S, M. E.; Trujillo Z, F. E.; Gamboa de Buen, I.

    2009-01-01

    The dosimeters TLD-100 and TLD-900 were used to know the levels of environmental dose in areas of the Nuclear Medicine Department of the National Institute of Cancer. The dosimeters calibration was carried out in the Metrology Department of the National Institute of Nuclear Research. The radioisotopes used in the studied areas are 131 I, 18 F, 67 Ga, 99m Tc, 111 In, 201 Tl and 137 Cs with gamma energies between 93 and 662 KeV. Dosimeters were placed during five months in the diagnostic, injection, waiting and PET rooms as well as hot room, waste room, enclosed corridors to patient rooms treated with 131 I and 137 Cs and witness dosimeters to know the bottom. The values found vary between 0.3 and 70 major times that those of bottom. The maximum doses were measured in the waste room and in the enclosed corridor to the patient rooms with cervical uterine cancer treated with 137 Cs. (Author)

  1. Numerical analysis for complex thermoluminiscence glow curves.Application to the study of LiF: Ti, Mg and its in radiation dosimetry

    International Nuclear Information System (INIS)

    Gomez Ros, J.M.

    1989-01-01

    A method for the numerical analysis of complex termoluminiscence glow curves based in a modified Marquard Levenberg minimization algorithm is presented. Differents analytical expresions are employed for the individual glow peaks in the cases of first, second and mixed order kinetics, developping aproximated expresions for everyone. These procedures are applied to the caracterization of Lithium Fluoride studying the kinetic order of peaks IV and V. The results obtained permits an interpretation of the complex isothermal decay observed at 165 0 C compatible whith first order kinetics process for both peaks. The aplication to thermoluminiscent dosimetry (TLD) is also described. Other numerical methods are specifically developped to operate whith LiF 8TLD-100) in specific dosimetric aplications of TLD, such environ mental monitoring and mailed dosimetry systems for quality assurance in radiotherapy facilities. The reduction in the minimun detectable dose and the increment in the fiability of the meassurements are some of the advantages obtained over conventional evaluation systems. (Author)

  2. Preliminary assessment of LiF and alanine detectors for the dosimetry of proton therapy beams

    International Nuclear Information System (INIS)

    Fattibene, P.; Calicchia, A.; De Angelis, C.; Onori, S.; Egger, E.

    1996-01-01

    An experimental intercomparison between the proton response of LiF TLD-100 and alanine detectors is reported. The investigations were performed with LiF chips and alanine pellets in a 62 MeV proton beam at the Paul Scherrer Institut in Villigen (CH). Results were compared with reference dosimetry provided by Markus type parallel plate ionization chamber. The response of the detectors was studied, in a phantom, at different beam penetration depths in pristine and modulated beams. For both alanine and TL detectors, within the experimental uncertainty of the measurements, no significant energy dependence in the response was observed down to the Bragg peak region. The sensitivity of alanine and LiF detectors to protons was measured in the centre of modulated Bragg peak and no significant difference was found with respect to 60 Co. Contrary to LiF, alanine also offers a remarkable tissue equivalence which favours its choice for in-phantom dosimetry. (author)

  3. Thermoluminescence characterisation of chemical vapour deposited diamond films

    CERN Document Server

    Mazzocchi, S; Bucciolini, M; Cuttone, G; Pini, S; Sabini, M G; Sciortino, S

    2002-01-01

    The thermoluminescence (TL) characteristics of a set of six chemical vapour deposited diamond films have been studied with regard to their use as off-line dosimeters in radiotherapy. The structural characterisation has been performed by means of Raman spectroscopy. Their TL responses have been tested with radiotherapy beams ( sup 6 sup 0 Co photons, photons and electrons from a linear accelerator (Linac), 26 MeV protons from a TANDEM accelerator) in the dose range 0.1-7 Gy. The dosimetric characterisation has yielded a very good reproducibility, a very low dependence of the TL response on the type of particle and independence of the radiation energy. The TL signal is not influenced by the dose rate and exhibits a very low thermal fading. Moreover, the sensitivity of the diamond samples compares favourably with that of standard TLD100 dosimeters.

  4. Elaboration of pellets of LiF: Mg, Cu, P and its dosimetric properties; Elaboracion de pastillas de LiF: Mg, Cu, P y sus propiedades dosimetricas

    Energy Technology Data Exchange (ETDEWEB)

    Gutierrez C, A.; Gonzalez M, P.R.; Azorin N, J

    1991-03-15

    The LiF: Mg, Cu, P is at the moment in the entire world one of the TL materials of more interest, by its equivalence with the tissue, as well as for its high sensitivity, which is 25 to 35 times greater than of the TLD-100 of Harshaw (USA). In our laboratory dosemeters of this material have been developed in form of sinterized pellets. The importance of these new dosemeters in pellet form is due to that in this form its manipulation is facilitated. Due to its high sensitivity, these dosemeters result to be those but appropriate to measure the ionizing radiations, in intervals of extremely low dose. In this report the method of elaboration of the pellets, as well as its main dosimetric characteristics are presented. (Author)

  5. Method of evaluation of diagnostics reference levels in computerized tomography

    International Nuclear Information System (INIS)

    Vega, Walter Flores

    1999-04-01

    Computerized tomography is a complex technique with several selectable exposition parameters delivering high doses to the patient. In this work it was developed a simple methodology to evaluate diagnostic reference levels in computerized tomography, using the concept of Multiple Scan Average Dose (MSAD), recently adopted by the Health Ministry. For evaluation of the MSAD, a dose distribution was obtained through a measured dose profile on the axial axis of a water phantom with thermoluminescence dosemeters, TLD-100, for different exam technique. The MSAD was evaluated hrough two distinct methods. First, it was evaluated by the integration of the dose profile of a single slice and, second, obtained by the integration on central slice of the profile of several slices. The latter is in of accordance with the ionization chamber method, suggesting to be the most practical method of dose evaluation to be applied in the diagnostic reference level assessment routine for CT, using TLDs. (author)

  6. Ambient radiation levels in positron emission tomography/computed tomography (PET/CT) imaging center

    Science.gov (United States)

    Santana, Priscila do Carmo; de Oliveira, Paulo Marcio Campos; Mamede, Marcelo; Silveira, Mariana de Castro; Aguiar, Polyanna; Real, Raphaela Vila; da Silva, Teógenes Augusto

    2015-01-01

    Objective To evaluate the level of ambient radiation in a PET/CT center. Materials and Methods Previously selected and calibrated TLD-100H thermoluminescent dosimeters were utilized to measure room radiation levels. During 32 days, the detectors were placed in several strategically selected points inside the PET/CT center and in adjacent buildings. After the exposure period the dosimeters were collected and processed to determine the radiation level. Results In none of the points selected for measurements the values exceeded the radiation dose threshold for controlled area (5 mSv/year) or free area (0.5 mSv/year) as recommended by the Brazilian regulations. Conclusion In the present study the authors demonstrated that the whole shielding system is appropriate and, consequently, the workers are exposed to doses below the threshold established by Brazilian standards, provided the radiation protection standards are followed. PMID:25798004

  7. TLD environmental monitoring at the Institute of Nuclear Engineering in Brazil

    Energy Technology Data Exchange (ETDEWEB)

    Taam, I.H. [Instituto de Engenharia Nuclear (IEN/CNEN-RJ), Caixa Postal 68550, 21945-970 Rio de Janeiro, RJ (Brazil); Rosa, L.A.R. da [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Av. Salvador Allende s/n, Caixa Postal 37760, 22780-160 Rio de Janeiro, RJ (Brazil)], E-mail: lrosa@ird.gov.br; Crispim, V.R. [PEN/COPPE-DNC/POLI/CT/UFRJ, Caixa Postal 68509, 21941-972 Rio de Janeiro, RJ (Brazil)

    2008-09-15

    Since 2003 the Institute of Nuclear Engineering in Rio de Janeiro city, Brazil, operates a new cyclotron, RDS-111, to produce {sup 18}F-Fluorodeoxyglucose to be used in nuclear medicine. Additionally, the IEN radioactive waste repository has been enlarged during the past last years, receiving a considerable amount of radioactive materials. Therefore, it became necessary to evaluate a possible increase of the environmental gamma exposure rates at the institute site due to the operation of the new accelerator and the enlargement of the institute waste repository as well. LiF:Mg,Cu,P, TLD-100H, and TL detectors were employed for environmental kerma rate evaluation and the results were compared with previous results obtained before the RDS-111 operation initialisation and the enlargement of IEN waste repository. No significant contribution for the enhancement of environmental gamma kerma rates was detected.

  8. Thermoluminescent dosemeter in a X-ray diffractometer; Dosimetria termoluminiscente en un difractometro de rayos X

    Energy Technology Data Exchange (ETDEWEB)

    Mendoza A, D.; Gonzalez M, P.; Falcon B, T. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, Mexico D.F. (Mexico); Castano, V.M. [Instituto de Fisica, UNAM, Laboratorio Juriquilla, A.P. 1-1010, C.P. 76001, Queretaro (Mexico)

    1999-07-01

    In this work it was presented the results obtained of the dosimetry which was realized in a X-ray diffractometer for powders, trademark Siemens D5000, using the thermoluminescent signal generated by the X-rays in the commercial dosemeter TLD-100 of Harshaw, US. In according to the results obtained, the radiation quantity received by an analysed material in the diffractometer, will be proportional to exposure time and it can vary from unities until tenths of grays. These results are very outstanding when are analysed crystalline materials in a diffractometer, for knowing the present crystalline phases, mainly if these are highly sensitive to the ionizing radiation, as it is the case of the thermoluminescent materials. (Author)

  9. A review of TLD's zero-count based on temperature and radiation history of them

    Science.gov (United States)

    Tunçel, Nina; Karakuş, İsmail; Dündar, Ertuğrul; Toykan Çiflikçi, Özlem

    2017-09-01

    In order to review the background value of a group of TLD-100, the zero-count values were collected from the first reading and after seven years after using them in experimental irradiations. The zero-counts for these two conditions were collected, as well as the dependence of temperature and radiation history of this group was evaluated. This study recommended that after frequently irradiation of TLDs the rearrangement for obtaining zero-count value must be performed before using TLDs in a new irradiation examination. Regarding on memory of radiation and thermal history, the sensitivity can change after receiving a large dose of radiation and undergoing readout. Additional annealing would be necessary to restore the original sensitivity. TLDs must be used under reproducible conditions to obtain consistent results.

  10. Thermoluminescent dosemeters characterization for patient dosimetry in diagnostic radiology preliminary results

    International Nuclear Information System (INIS)

    Castro, William J.; Squair, Peterson L.; Gonzaga, Natalia B.; Nogueira, Maria S.; Silva, Teogenes A. da

    2009-01-01

    The determination of the metrological characteristics of thermoluminescent (TL) dosimeters plays an important role in dosimetry of patients submitted to x-ray examinations for diagnostic purpose. Entrance surface doses can be measured with TL dosimeters to verify the compliance with the diagnostic reference levels. Organ doses can be estimated through TL measurements in an anthropomorphic phantom which it allows the radiation risk assessment. In this work, LiF:Mg,Ti (TLD-100) rod and chip thermoluminescent dosimeters were characterized considering their use for patient dosimetry in computerized tomography and mammography. Preliminary results showed that TL dosimeters have a response reproducibility of 7.8% and 4.8% and homogeneity of 18.4% and 6.5% for rod and chip shapes, respectively. (author)

  11. Method of evaluation of diagnostics reference levels in computerized tomography; Metodo de avaliacao de niveis de referencia de radiodiagnostico em tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Vega, Walter Flores

    1999-04-01

    Computerized tomography is a complex technique with several selectable exposition parameters delivering high doses to the patient. In this work it was developed a simple methodology to evaluate diagnostic reference levels in computerized tomography, using the concept of Multiple Scan Average Dose (MSAD), recently adopted by the Health Ministry. For evaluation of the MSAD, a dose distribution was obtained through a measured dose profile on the axial axis of a water phantom with thermoluminescence dosemeters, TLD-100, for different exam technique. The MSAD was evaluated hrough two distinct methods. First, it was evaluated by the integration of the dose profile of a single slice and, second, obtained by the integration on central slice of the profile of several slices. The latter is in of accordance with the ionization chamber method, suggesting to be the most practical method of dose evaluation to be applied in the diagnostic reference level assessment routine for CT, using TLDs. (author)

  12. In vivo dosimetry using thermoluminescent detector in cancer therapy of head and neck

    International Nuclear Information System (INIS)

    Viegas, Claudio C.B.; Batista, D.V.; Campos, A.M.; Lopes, R.T.

    2002-01-01

    The viability and implementation of a routine in vivo dosimetry, using thermoluminescent dosemeters (TLD), at the radiotherapy section of the National Institute of Cancer in Brazil, in the case of head and neck treatment is shown. In order to reach that aim, the characteristics of the response of the LiF:Mg;Ti (TLD-100) thermoluminescent detectors in powder form were determined. The performed of this detector for in vivo dosimetry was testes using an RANDO Alderson anthropomorphic phantom and, once their adequability proved for the kind of measurements proposed , it was used for dose assessment in the case of tumour treatments in the head and neck regions, for Cobalt-60 irradiations. (author)

  13. Estimate of the exposition to the ionizing radiation of the medical veterinarians and its assistants in radiology examinations veterinary medicine

    Energy Technology Data Exchange (ETDEWEB)

    Lima, G.; Braz, D.; Lopez, R. [Rio de Janeiro Univ. Federal, COPPE (Brazil); Mauricia, C. [Rio de Janeiro Univ. Federal, Instituto de Radioprotecao e Dosimetria (Brazil); Barroso, R. [Rio de Janeiro Univ. Federal, Universidade Estadual do Rio de Janeiro (Brazil)

    2006-07-01

    The absorbed ionizing radiation outside of the permissible limits, can cause biological damages e, therefore it must necessarily be monitored. The dosimetry thermoluminescent is a technique very used to detect expositions in operatorserefore they are sensible crystals the ionizing radiation and allows to evaluate if the dose of radiation is or not below of the restriction levels. In scientific literature many information do not exist on the exposition of a medical veterinarian, with this do not have many data of the individual monitoring of these workers, becoming the work it important for posterior studies. Ahead of this, it was carried through measured of the doses, using the thermoluminescence dosemeters LiF: Mg, Cu, P (TLD-100 H) in the position of the crystalline lens, thyroid, hand and thorax, in three clinics of radiology veterinary medicine, different, having the objective to determine the dose distribution that the workers of radiology veterinary medicine are submitted in one day of work. (authors)

  14. Development of a dosimetric system for the quality control of breast cancer treatments; Desenvolvimento de um sistema dosimetrico para o controle de qualidade nos tratamentos de cancer de mama

    Energy Technology Data Exchange (ETDEWEB)

    Chaves, Roberio C.; Crispim, Verginia R., E-mail: rchaves@nuclear.ufrj.br, E-mail: verginia@nuclear.ufrj.br [Coordenacao dos Programas de Pos-Graduacao de Engenharia (PEN/COPPE/lUFRJ), RJ (Brazil). Programa de Pos-Graduacao em Engenharia Nuclear; Rosa, Luiz A.R. da, E-mail: Irosa@ird.gov.br [Instituto de Radioprotecao e Dosimetria (IRD/CNEN), Rio de Janeiro, RJ (Brazil); Santos, Delano B.V., E-mail: delano@inca.gov.br [Instituto Nacional do Cancer (INCA/MS), Rio de Janeiro, RJ (Brazil)

    2013-11-01

    A system for evaluating the values of absorbed dose in breast teletherapy was developed, using thermoluminescent dosimeters (TLD-100), to compare them to those provided by Therapy planning system. A breast phantom was made to distribute the dosimeters TL shaped chip in breast volume and irradiate it under the same conditions of planning. Three different techniques of teletherapy were considered: one with irradiation from a therapy unit of {sup 60}Co and two with an X-ray beam coming from a 6 MV linear accelerator. Doses measures allowed checking that the performance of the quality control system used in breast cancer treatment is appropriate, since the planned doses differed about 1.5% of the responses provided by TL dosimeters.

  15. Postal dosimetry audit test for small photon beams

    International Nuclear Information System (INIS)

    Espinosa, María del Mar; Núñez, Luis; Muñiz, José Luis; Lagares, Juan Ignacio; Embid, Miguel; Gómez-Ros, José María

    2012-01-01

    Background and purpose: Small radiation beams ( 3 ) of TLD-100 inserted at 5 and 10 cm of depth in a cylindrical PMMA phantom designed for this purpose. This experimental system is mailed to the audited centres to be irradiated with beams of 1 and 3 cm of side or diameter. The prescribeddose is 1.5 Gy at 10 cm. The properties of this system were studied experimentally and by Monte Carlo (MC) simulation, before the external test. Results: Deviations between the prescribed and measured absorbed doses are below 5% for 69% (1 × 1 cm 2 beam) and 64% (3 × 3 cm 2 beam) of the audited centres. When deviations are above 5%, their causes have been investigated and led to corrections. Conclusion: The developed postal audit is suitable to verify the absorbed doses in small photon beams with an accuracy of 2.9% (1s).

  16. Fast neutron response of LiF T.L. dosimeters

    Energy Technology Data Exchange (ETDEWEB)

    Ranogajec-Komor, M.; Knezevic, I.; Miljanic, S.; Blagus, S. [Institute, Zagreb (Croatia)

    2006-07-01

    Generally, the intensity of the main dosimetric peak i.e. the sensitivity of the most thermoluminescence (T.L.) dosimeters (expressed as the T.L. response/absorbed dose) decreases with increasing Let. However, it is known that the 'high temperature peak' (H.T.P.) of LiF:Mg,Ti T.L. detectors increases with increasing Let, while the 'low temperature peak' (L.T.P.) of LiF:Mg,Ti decreases. H.T.P., also called peak 7, appears between 240- 270 Celsius degrees, while L.T.P. can be found in the literature as peak 5 or 'dosimetric' peak and appears in the temperature range 180 -240 Celsius degrees. The dose response results of L.T.P. and H.T.P. of LiF:Mg,Ti in the literature are ambiguous in high Let radiation field. The reason in most cases is that the gamma component in the mixed field is not taken properly into consideration. In the every day practice work place monitoring it is necessary to measure low Let (gamma) and both low and high Let (e.g. gamma-neutron) radiation in the mixed fields. T.L.D. -100 (Harshaw) and M.T.S.-N (Poland) LiF:Mg,Ti dosimeters produced from natural LiF are easily available and widely used in the practical dosimetry tasks. The aim of this study was to compare the Let sensitivity of L.T.P. and H.T.P. for T.L.D.-100 (Harshaw) and M.T.S.-N (Poland) LiF detectors for 14.5 MeV neutrons in the dose range 50 mGy-300 mGy (expressed in tissue kerma). At the same time the effect of the holder type to the dosimeter response was also studied. 14.5 MeV fast neutrons produced by Texas Nuclear Corporation 300 keV electrostatic accelerator using 3 H(d,n)4 He nuclear reaction was used for neutron irradiation. The gamma component in the mixed field was measured by Geiger-Mueller counter calibrated in standard dosimetry laboratory. Gamma irradiation was carried out by {sup 137}Cs source. It was found, that while the gamma sensitivity of M.T.S. -N compared to T.L.D.-100 is about 2.5, the fast neutron sensitivity is much lower,equal to about 0.7. The responses of the low and high temperature T.L. peaks are linear for both kinds of LiF detectors in the dose range investigated. Adequate analytical peak separation and curve fitting programme enabled estimation of the relative neutron sensitivity of both peaks and the assessment of changes on the structure of glow curves by changes of Let of radiation. With respect to different sensitivities of H.T.P. and L.T.P. both M.T.S. -N and T.L.D.-100 are suitable for simultaneous measurement of neutron and gamma component of the dose in a mixed neutron-gamma radiation field using single dosimeter. (authors)

  17. Radiation protection cabin for catheter-directed liver interventions: operator dose assessment

    International Nuclear Information System (INIS)

    Maleux, Geert; Bosmans, Hilde; Bergans, Niki; Bogaerts, Ria

    2016-01-01

    The number and complexity of interventional radiological procedures and in particular catheter-directed liver interventions have increased substantially. The current study investigates the reduction of personal doses when using a dedicated radiation protection cabin (RPC) for these procedures. Operator and assistant doses were assessed for 3 series of 20 chemo-infusion/chemoembolisation interventions, including an equal number of procedures with and without RPC. Whole body doses, finger doses and doses at the level of knees and eyes were evaluated with different types of TLD-100 Harshaw dosemeters. Dosemeters were also attached on the three walls of the RPC. The operator doses were significantly reduced by the RPC, but also without RPC, the doses appear to be limited as a result of thorough optimisation with existing radiation protection tools. The added value of the RPC should thus be determined by the outcome of balancing dose reduction and other aspects such as ergonomic benefits. (authors)

  18. Dosimetry of patients submitted to cerebral PET/CT for the diagnosis of mild cognitive impairment

    Energy Technology Data Exchange (ETDEWEB)

    Santana, Priscila do Carmo; Oliveira, Paulo Marcio Campos de; Bernardes, Felipe Dias; Mamede, Marcelo, E-mail: pridili@gmail.com [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil); Mourao, Arnaldo Prata [Centro Federal de Educacao Tecnologica de Minas Gerais (CEFET), Belo Horizonte, MG (Brazil); Silva, Teogenes Augusto da [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)

    2014-11-15

    Objective: the present study was aimed at evaluating the effective radiation dose in patients submitted to PET/CT for the diagnosis of mild cognitive impairment. Materials and methods: TLD-100 detectors inserted into an Alderson Rando® anthropomorphic phantom were utilized to measure the absorbed dose coming from the CT imaging modality. The anthropomorphic phantoms (male and female adult versions) were submitted to the same technical protocols for patients’ images acquisition. The absorbed dose resulting from the radiopharmaceutical injection was estimated by means of the model proposed by the ICRP publication 106. Results: the effective dose in patients submitted to this diagnostic technique was approximately (5.34 ± 1.99) mSv. Conclusion: optimized protocols for calculation of radioactive activity injected into patients submitted to this diagnostic technique might contribute to reduce the effective radiation dose resulting from PET/CT in the diagnosis of mild cognitive impairment. (author)

  19. Development of a dosimetric system for the quality control of breast cancer treatments

    International Nuclear Information System (INIS)

    Chaves, Roberio C.; Crispim, Verginia R.; Santos, Delano B.V.

    2013-01-01

    A system for evaluating the values of absorbed dose in breast teletherapy was developed, using thermoluminescent dosimeters (TLD-100), to compare them to those provided by Therapy planning system. A breast phantom was made to distribute the dosimeters TL shaped chip in breast volume and irradiate it under the same conditions of planning. Three different techniques of teletherapy were considered: one with irradiation from a therapy unit of 60 Co and two with an X-ray beam coming from a 6 MV linear accelerator. Doses measures allowed checking that the performance of the quality control system used in breast cancer treatment is appropriate, since the planned doses differed about 1.5% of the responses provided by TL dosimeters

  20. Estimation of equivalent dose on the ends of hemodynamic physicians during neurological procedures; Avaliacao da dose equivalente nas extremidades de medicos hemodinamicistas durante procedimentos neurologicos

    Energy Technology Data Exchange (ETDEWEB)

    Squair, Peterson L.; Souza, Luiz C. de; Oliveira, Paulo Marcio C. de [Universidade FUMEC, Belo Horizonte, MG (Brazil). Radiologia e Protecao Radiologica; Nogueira, Maria do S. [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)

    2005-07-01

    The estimation of doses in the hands of physicists during hemodynamic procedures is important to verify the application of radiation protection related to the optimization and limit of dose, principles required by the Portaria 453/98 of Ministry of Health/ANVISA, Brazil. It was checked the levels of exposure of the hands of doctors during the use of the equipment in hemodynamic neurological procedures through dosimetric rings with thermoluminescent dosemeters detectors of LiF: Mg, Ti (TLD-100), calibrated in personal Dose equivalent HP (0.07). The average equivalent dose in the end obtained was 41.12. {mu}Sv per scan with an expanded uncertainty of 20% for k = 2. This value is relative to the hemodynamic Neurology procedure using radiological protection procedures accessible to minimize the dose.

  1. Assessment of breast absorbed doses during thoracic computed tomography scan to evaluate the effectiveness of bismuth shielding.

    Science.gov (United States)

    Alonso, Thessa C; Mourão, Arnaldo P; Santana, Priscila C; da Silva, Teógenes A

    2016-11-01

    During a lung computed tomography (CT) examination, breast and nearby radiosensitive organs are unnecessarily irradiated because they are in the path of the primary beam. The purpose of this paper is to determine the absorbed dose in breast and nearby organs for unshielded and shielded exposures with bismuth. The experiment was done with a female anthropomorphic phantom undergoing a typical thoracic CT scan, with TLD-100 thermoluminescent detectors insert at breast, lung and thyroid positions. Results showed that dose reduction due to bismuth shielding was approximately 30% and 50% for breast and thyroid, respectively; however, the influence of the bismuth on the image quality needs to be considered. Copyright © 2016 Elsevier Ltd. All rights reserved.

  2. Investigation of silica-based TL media for diagnostic x-ray dosimetry

    Science.gov (United States)

    Alyahyawi, Amjad; Siti Rozaila, Z.; Siti Shafiqah, A. S.; Sabtu, Siti Norbaini; Alsubaie, A.; Alanazi, A.; Daar, Eman.; Abdul Sani, S. F.; Bradley, D. A.

    2017-11-01

    We focus on the development of Ge-doped silica thermoluminescent dosimeters with sensitivity superior to that of the LiF (Mg,Ti) phosphors popularly used in x-ray diagnostic imaging dosimetry, the latter typically being referred to through use of the product identifier TLD-100. Of interest are Ge-doped silica telecommunication fibres (SMF) and tailor-made doped photonic crystal fibres (PCFc), the latter Ge-doped or also co-doped with boron. The PCFs are formed of capillaries that at high temperatures and under vacuum are made to collapse inwards (PCFc), the internal walls fusing and generating strain-related defects. To-date, the fabricated SMF, PCFc-Ge and PCFc-Ge-B have been observed to provide TL yields which weight-for-weight are some 2, 10 and 15x that of TLD-100. In present study we test the linearity of TL yield for x-ray doses from 0.1- to 10 mGy, use being made of an x-ray tube operated at 80 kVp, an operating potential typically selected in chest radiography. For a dose of 10 mGy, a study of energy dependence has been conducted using x-ray tube potentials of 80 kVp 100 kVp, and 120 kVp, with inherent filtration 0.9 mm Al measured at 75 kVp, and total filtration of 2.8 mm Al at 80 kVp.

  3. Effective dose range for dental cone beam computed tomography scanners

    International Nuclear Information System (INIS)

    Pauwels, Ruben; Beinsberger, Jilke; Collaert, Bruno; Theodorakou, Chrysoula; Rogers, Jessica; Walker, Anne; Cockmartin, Lesley; Bosmans, Hilde; Jacobs, Reinhilde; Bogaerts, Ria; Horner, Keith

    2012-01-01

    Objective: To estimate the absorbed organ dose and effective dose for a wide range of cone beam computed tomography scanners, using different exposure protocols and geometries. Materials and methods: Two Alderson Radiation Therapy anthropomorphic phantoms were loaded with LiF detectors (TLD-100 and TLD-100H) which were evenly distributed throughout the head and neck, covering all radiosensitive organs. Measurements were performed on 14 CBCT devices: 3D Accuitomo 170, Galileos Comfort, i-CAT Next Generation, Iluma Elite, Kodak 9000 3D, Kodak 9500, NewTom VG, NewTom VGi, Pax-Uni3D, Picasso Trio, ProMax 3D, Scanora 3D, SkyView, Veraviewepocs 3D. Effective dose was calculated using the ICRP 103 (2007) tissue weighting factors. Results: Effective dose ranged between 19 and 368 μSv. The largest contributions to the effective dose were from the remainder tissues (37%), salivary glands (24%), and thyroid gland (21%). For all organs, there was a wide range of measured values apparent, due to differences in exposure factors, diameter and height of the primary beam, and positioning of the beam relative to the radiosensitive organs. Conclusions: The effective dose for different CBCT devices showed a 20-fold range. The results show that a distinction is needed between small-, medium-, and large-field CBCT scanners and protocols, as they are applied to different indication groups, the dose received being strongly related to field size. Furthermore, the dose should always be considered relative to technical and diagnostic image quality, seeing that image quality requirements also differ for patient groups. The results from the current study indicate that the optimisation of dose should be performed by an appropriate selection of exposure parameters and field size, depending on the diagnostic requirements.

  4. Determination of the intrinsic energy dependence of LiF:Mg,Ti thermoluminescent dosimeters for 125I and 103Pd brachytherapy sources relative to 60Co

    International Nuclear Information System (INIS)

    Reed, J. L.; Micka, J. A.; Culberson, W. S.; DeWerd, L. A.; Rasmussen, B. E.; Davis, S. D.

    2014-01-01

    Purpose: To determine the intrinsic energy dependence of LiF:Mg,Ti thermoluminescent dosimeters (TLD-100) for 125 I and 103 Pd brachytherapy sources relative to 60 Co. Methods: LiF:Mg,Ti TLDs were irradiated with low-energy brachytherapy sources and with a 60 Co teletherapy source. The brachytherapy sources measured were the Best 2301 125 I seed, the OncoSeed 6711 125 I seed, and the Best 2335 103 Pd seed. The TLD light output per measured air-kerma strength was determined for the brachytherapy source irradiations, and the TLD light output per air kerma was determined for the 60 Co irradiations. Monte Carlo (MC) simulations were used to calculate the dose-to-TLD rate per air-kerma strength for the brachytherapy source irradiations and the dose to TLD per air kerma for the 60 Co irradiations. The measured and MC-calculated results for all irradiations were used to determine the TLD intrinsic energy dependence for 125 I and 103 Pd relative to 60 Co. Results: The relative TLD intrinsic energy dependences (relative to 60 Co) and associated uncertainties (k = 1) were determined to be 0.883 ± 1.3%, 0.870 ± 1.4%, and 0.871 ± 1.5% for the Best 2301 seed, OncoSeed 6711 seed, and Best 2335 seed, respectively. Conclusions: The intrinsic energy dependence of TLD-100 is dependent on photon energy, exhibiting changes of 13%–15% for 125 I and 103 Pd sources relative to 60 Co. TLD measurements of absolute dose around 125 I and 103 Pd brachytherapy sources should explicitly account for the relative TLD intrinsic energy dependence in order to improve dosimetric accuracy

  5. Dosimetric study in iodine-125 seeds for brachytherapy application

    International Nuclear Information System (INIS)

    Zeituni, Carlos Alberto

    2008-01-01

    The demand for iodine-125 seeds for use in brachytherapy treatments has experienced an increase along recent years in Brazil and all over the world. All iodine-125 seed must have its operational parameters measured and/or calculated every time changes in the production process are carried out. A complete dosimetric measurement is very expensive, and it is recommended that this procedure must be repeated at least once a year. Thus, this work developed a methodology for the entire dosimetric process. This methodology is based on the scarce information available in the literature, once almost all the methodology used in large industrial laboratories is commercial secret. The proposed methodology was tested using seeds of Amersham-Oncura-Ge Healthcare, which is the largest seed manufactory in the world. In this new methodology, an automatic reader was employed in order to reduce the time required in the selection process of the TLD-100 dosimeters used and a postprocessing of the obtained spectra was carried out. A total of 142 dosimeters were used and only 29 have been selected using the new methodology. Measurements were performed using slabs of Solid Water RW1 to simulate measuring in the 'water', using three different experimental apparatus and each measurement was repeated at least three times. The TLD-100 calibration was performed using a Dermopan II - Siemens. The measured values showed a good agreement with the ones available in the literature. Finally, these measured values were compared with calculated ones obtained by a semiempirical simulation program, showing a good agreement and, therefore, demonstrating the validity of the proposed methodology regarding dosimetric calculations. (author)

  6. Implementation of a dosimetry service for the occupationally exposed personnel of the ESFM-IPN; Implementacion de un servicio de dosimetria para el personal ocupacionalmente expuesto de la ESFM-IPN

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez A, Y. [Comision Nacional de Seguridad Nuclear y Salvaguardias, Dr. Barragan No. 779, Col. Narvarte, 03020 Mexico D. F. (Mexico); Sanchez R, A. A. [IPN, Escuela Superior de Fisica y Matematicas, U. P. Adolfo Lopez Mateos, Edif. 9, 07738 Mexico D. F. (Mexico); Ceron R, P. V.; Rivera M, T. [IPN, Centro de Investigacion en Ciencia y Tecnologia Avanzada, Unidad Legaria, Av. Legaria No. 694, 11500 Mexico D. F. (Mexico); Vega C, H. R., E-mail: yamani.hernandez@cnsns.gob.mx [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas (Mexico)

    2014-10-15

    Because the ionizing radiations handling implies a risk for the health, is necessary to take a control of the radiation quantity that the occupationally exposed personnel receives during their daily work with ionizing radiations. For this purpose there are several types of dosimetry and companies that provide the service, but taking advantage that the Escuela Superior de Fisica y Matematicas del Instituto Politecnico Nacional (ESFM-IPN) possesses a thermoluminescence equipment (Tl) was decided to develop a personnel dosimetry service for gammas, with thermoluminescent glasses of type TLD-100. First one carries out a glasses characterization, for which the glasses were washed with a methyl alcohol solution, without rubbing them for not damaging them; after the drying, they were subjected to a temperature of 400 C during one hour and later on 100 grades C for two hours in order to erasing them the bottom information that they could have. 200 glasses were exposed to gamma radiation coming from a Cobalt 60 source property of ESFM-IPN in order to selecting the glasses that had a response whose precision was inside a standard deviation. Of this characterization 80 dosimeters were selected that had better response according to the obtained readings as well as of their shine curves. These selected TLD-100 glasses were irradiated to different dose of gamma radiation and with those readings it was built a dose response curve in m R against readings of electric load in pick Coulombs (pCou). The response curve was a direct line or calibration curve. As final exercise some glasses of this selected lot were subjected to irradiation dose not known by the person that carried out the readings and this way was proven that the results were appropriate with the calibration curve. Finally these dosimeters were placed in port-dosimeters and erased guides of dosimeters, of equipment use and dosimeters lecture were also elaborated. (Author)

  7. Implementation of a dosimetry service for the occupationally exposed personnel of the ESFM-IPN

    International Nuclear Information System (INIS)

    Hernandez A, Y.; Sanchez R, A. A.; Ceron R, P. V.; Rivera M, T.; Vega C, H. R.

    2014-10-01

    Because the ionizing radiations handling implies a risk for the health, is necessary to take a control of the radiation quantity that the occupationally exposed personnel receives during their daily work with ionizing radiations. For this purpose there are several types of dosimetry and companies that provide the service, but taking advantage that the Escuela Superior de Fisica y Matematicas del Instituto Politecnico Nacional (ESFM-IPN) possesses a thermoluminescence equipment (Tl) was decided to develop a personnel dosimetry service for gammas, with thermoluminescent glasses of type TLD-100. First one carries out a glasses characterization, for which the glasses were washed with a methyl alcohol solution, without rubbing them for not damaging them; after the drying, they were subjected to a temperature of 400 C during one hour and later on 100 grades C for two hours in order to erasing them the bottom information that they could have. 200 glasses were exposed to gamma radiation coming from a Cobalt 60 source property of ESFM-IPN in order to selecting the glasses that had a response whose precision was inside a standard deviation. Of this characterization 80 dosimeters were selected that had better response according to the obtained readings as well as of their shine curves. These selected TLD-100 glasses were irradiated to different dose of gamma radiation and with those readings it was built a dose response curve in m R against readings of electric load in pick Coulombs (pCou). The response curve was a direct line or calibration curve. As final exercise some glasses of this selected lot were subjected to irradiation dose not known by the person that carried out the readings and this way was proven that the results were appropriate with the calibration curve. Finally these dosimeters were placed in port-dosimeters and erased guides of dosimeters, of equipment use and dosimeters lecture were also elaborated. (Author)

  8. Optimization of the preparation method of LiF: Mg, Cu, P and study of its thermoluminescent properties to be used in ionizing radiation dosimetry

    International Nuclear Information System (INIS)

    Gonzalez M, P.R.

    1995-01-01

    In this thesis the preparation and dosimetric properties of the thermoluminescence phosphor LiF doped with magnesium, copper and phosphorus are studied. In chapter 1 luminescence phenomenon in solids is described, emphasizing the importance of thermally stimulated luminescence known as thermoluminescence (TL) as well as its application in ionizing radiation dosimetry. The models used to determine the kinetics parameters in the TL phenomenon are described in chapter 2. In chapter 3, the dosimetric characteristics of a TL materials and its requirements for dosimetry are analyzed. The preparation method of LiF: Mg, Cu, P is presented in chapter 4 studying its general characteristics for dosimetry. The concentrations of dopants, glow curve structure, TL response to gamma, beta and alpha exposures are studied along with those of LiF: Mg, Cu, P prepared for other authors and with those of LiF: Mg, Ti (TLD-100). The kinetic parameters of the phosphor were determined by the deconvolution method. Pellets of this new phosphor powder were made by pressing it at room temperature and sintering in inert atmosphere at 700 Centigrade degrees. Dosimetric characteristics of these pellets were also studied. Chapter 5 presents the results and conclusions of this study. The new dosimeter exhibited three peaks in its glow curve at 140, 180 and 220 Centigrade degrees respectively. Its TL response to gamma radiation was linear from 43.5 μ Gy to 100 Gy. This dosimeter is reusable and stable without significant loss of sensitivity. Its sensitivity was about 30 times higher than that of TLD-100. Fading of this dosimeter was negligible at room temperature as well as at body temperature (37 Centigrade degrees), and 65% at 60 Centigrade degrees. In conclusion, this dosimeter meets all the requirements of the ANSI standard. These and other characteristics render this dosimeter useful in diverse applications of radiation dosimetry. (Author)

  9. Thermoluminescent dosimetry in computed tomography

    Energy Technology Data Exchange (ETDEWEB)

    Lara C, A.; Rivera M, T. [IPN, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Unidad Legaria, Av. Legaria 694, Col. Irrigacion, 11500 Ciudad de Mexico (Mexico); Osorio V, M. [ISSSTE, Centro Medico Nacional 20 de Noviembre, Felix Cuevas 540, Col. del Valle, 03100 Ciudad de Mexico (Mexico); Hernandez O, O., E-mail: armando_lara_cam@yahoo.com.mx [Hospital General de Mexico, Dr. Balmis 148, Col. Doctores, 06726 Ciudad de Mexico (Mexico)

    2016-10-15

    In this work we studied the dosimetry performed on CT scan in two different equipment, SOMATOM and Phillips, with 16 and 64 slice respectively. We used 51 pellets of lithium fluoride doped with magnesium and titanium (LiF: Mg, Ti) also knows as TLD-100 due to its physical properties and its easy of use, in this study, first analysis a batch of 56 pellets, but only 53 pellets were optimal for this study, cesium-137 was used as source irradiation, then proceeded to calibrate the batch with X-rays source, measuring the corresponding dose in a Farmers ionization chamber, then, we obtained a calibration curve, and we used as reference to calculation of the applied dose, finally designing ergonomic mesh, were it was deposited a TLD 100, placed in a regions of interest were made to each scan type. Once characterized our material proceeded to testing in 30 patients, which were irradiated with X-ray tube, whose operation was performed at 80, 120 kV with a current of 100, 300 and 400 m A according to scanning protocol. Overall we measured dose of 5 mGy to 53 mGy, these measurements reflect significant dose to can induced cancer, due previous reports published, that doses greater than 20 mGy there is a risk of developing cancer in the long term, but in practice when it assigned a medical diagnosis, there are no dose limits due to benefits patients, however, IAEA publish recommendations that allow us to carry out optimum handling of ionizing radiation, among these is the quality control of the tomography equipment that helps greatly reduce patient dose. (Author)

  10. Thermoluminescent dosimetry in computed tomography

    International Nuclear Information System (INIS)

    Lara C, A.; Rivera M, T.; Osorio V, M.; Hernandez O, O.

    2016-10-01

    In this work we studied the dosimetry performed on CT scan in two different equipment, SOMATOM and Phillips, with 16 and 64 slice respectively. We used 51 pellets of lithium fluoride doped with magnesium and titanium (LiF: Mg, Ti) also knows as TLD-100 due to its physical properties and its easy of use, in this study, first analysis a batch of 56 pellets, but only 53 pellets were optimal for this study, cesium-137 was used as source irradiation, then proceeded to calibrate the batch with X-rays source, measuring the corresponding dose in a Farmers ionization chamber, then, we obtained a calibration curve, and we used as reference to calculation of the applied dose, finally designing ergonomic mesh, were it was deposited a TLD 100, placed in a regions of interest were made to each scan type. Once characterized our material proceeded to testing in 30 patients, which were irradiated with X-ray tube, whose operation was performed at 80, 120 kV with a current of 100, 300 and 400 m A according to scanning protocol. Overall we measured dose of 5 mGy to 53 mGy, these measurements reflect significant dose to can induced cancer, due previous reports published, that doses greater than 20 mGy there is a risk of developing cancer in the long term, but in practice when it assigned a medical diagnosis, there are no dose limits due to benefits patients, however, IAEA publish recommendations that allow us to carry out optimum handling of ionizing radiation, among these is the quality control of the tomography equipment that helps greatly reduce patient dose. (Author)

  11. QA Programme of the TLD laboratory of the University of Costa Rica: IEC 61066 testing

    International Nuclear Information System (INIS)

    Mora, Patricia; Porras Chaverria, Mariela

    2008-01-01

    The Thermoluminescence Personal Dosimetry Laboratory of the University of Costa Rica provides dose measurements for around 90% of occupational radiation workers in the country. The assessment of doses to workers routinely exposed to external sources of radiation constitutes an integral part of any radiation protection programme and helps national authorities to ensure acceptably safe and satisfactory radiological conditions in workplaces. Harshaw Readers Model 4000 and 4500, dosimeter holders Type 8814 with TLD-100 in 0110 cards and loose TLD-100 chips are used to monitor personal dose equivalent, Hp(10) and Hp(0.07). In order to provide a reliable measurement of the operational quantities, a study was undertaken to verify the fulfillment of international requirements in our system (Model 4500 with cards) against the Thermoluminescence dosimetry systems for personal and environmental monitoring CEI IEC 61066 (1991 -2012). The type tests performed were nine in total: batch homogeneity, reproducibility, linearity, detection threshold, effect of climate conditions on reader, effect of light exposure on dosimeters, isotropy, transient voltage and dropping on dosimeters. A Cesium-137 source was used to irradiate the dosimeters and all procedures follow the indications given on the standard. Results showed that all IEC criteria were met by our Laboratory. Acceptable uncertainties were also studied under the ICRP recommendations; the analysis of the Trumpet Curve was done with satisfactory results (for doses above 0.5 mSv; quotient of measure to real dose less than 3%). For purposes of accreditation (ISO/IEC 17025:2005) and performance testing this work is very relevant since the University of Costa Rica wants to establish a solid individual monitoring programme for external radiation exposure that will provide users, registrants, licensees and regulatory bodies with information that can be used for the optimization of protection and dose limitation of Costa Rican workers

  12. Organizaciones Chinas Guanxi es más que networking

    OpenAIRE

    Guillermo S. Edelberg

    2006-01-01

    Describe la importancia de guanxi, valor agregado de los vínculos personales en los proceso de gestión empresarial en las organizaciones chinas. Se discute la importancia de la red de guanxi como ventaja competitiva

  13. Interacción social y crimen: un análisis del caso peruano a nivel provincial

    OpenAIRE

    Armas, Carmen; Velásquez, Daniel

    2017-01-01

    El presente estudio pretende documentar si la correlación entre las decisiones personales, definida como “interacción social”, contribuye a generar un mayor entendimiento acerca del fenómeno del crimen y su varianza.

  14. El Síndrome del Burnout en Fisioterapia

    OpenAIRE

    Romero Pasadas, C.; Gómez Sánchez, R.

    2002-01-01

    El objetivo de este trabajo es identificar si existe el Síndrome Burnout en Fisioterapia y determinar qué variables personales y laborales inciden en su desarrollo. Para ello, además de los datos procedentes del cuestionario Maslach Burnout lnventory (Maslach y lackson, 19861, hemos recogido información relativa a diferentes caracterfsticas del puesto de trabajo y variables personales, todo ello en una muestra de 33 fisioterapeutas pertenecientes a centros públicos y privados de l...

  15. Leg med vision

    DEFF Research Database (Denmark)

    Munk, Mette; Bertelsen, Katrine

    2011-01-01

    Bogen henvender sig primært til det pædagogiske personale med målgruppen daginstitutioner. Bogen skal stimulere arbejdet med at gøre bevægelse til en integreret del af kulturen i daginstitutioner - at få det pædagogiske personale til - at sætte ord på og spørgsmålstegn ved deres pædagogiske bevæg...

  16. Development of an automated informatic system, for the evaluation of damage in plastics and minerals; Desarrollo de un sistema informatico automatizado, para la evaluacion de danos en plasticos y minerales

    Energy Technology Data Exchange (ETDEWEB)

    Hidalgo V, V.; Lopez G, A.D.; Ledezma F, L.E.; Segovia R, A.; Balcazar, M. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico)

    2008-07-01

    A computer system of pattern recognition to evaluate automatically the damages registered by positive ions in minerals and plastics was developed. In the case of minerals the apatite in which was achievement to recognize and to count the damages by spontaneous fission of the uranium contained in her was selected. The selected plastic was the CR39, in which was possible to obtain the distribution of the diameters of the you give you taken place by slight ions in this plastic. In both cases, the recognition of patterns you bases on Ision for Computer, using the methodology described by Gonzalez and Woods [6]. The technique consists in: Acquisition of the Image, Pre-prosecution, Segmentation, Description and Classification; the computer system you development making use of the software Matlab version 7. The Apatita you selects for their importance in the one dated geologic and the determination of the thermal history, both of importance in the oil prospecting. In the case of the CR39 their importance resides in its wide and massive use as dosimetro of neutrons, determination of environmental Radon and detection of nuclear reactions of low section. (Author)

  17. TL dosimeters for gamma and thermal neutrons used at ENEA. Accuracy and calibration standards; Dosimetri a TL per neutroni termici e gamma impiegati in ENEA: metodo, calibrazione e qualificazione

    Energy Technology Data Exchange (ETDEWEB)

    Fantuzzi, E.; Gualdrini, G.F.; Monteventi, F.; Morelli, B.; Uleri, G. [ENEA, Centro Ricerche Ezio Clementel, Bologna (Italy). Dipt. Ambiente

    1998-07-01

    This work summaries the experimental results achieved on the characterisation of dosimetric systems used at ENEA (National Agency for New Technology, Energy and the Environment) laboratory in Bologna (Italy) and describes the calibration method either for a two-element dosemeter Harshaw and for a two-element dosemeter assembled at ENEA with higher sensitivity LiF detectors. Both calculation algorithm and calibration procedure have been defined and analyzed in terms of the dosimetric reference quantities. In addition, parameters responsible and crucial for the dosimetric reference quantities. In addition, parameters responsible and crucial for the dosimetric results are pointed out. Finally, intercomparisons between experimental data and numerical data (Monte Carlo code) are shown. [Italian] Vengono esposti i metodi utilizzati per la calibrazione di un dosimetro Harshaw e di uno con maggiore sensibilita' prodotto dal centro ENEA di Bologna con LiF. Sono stati definiti sia l'algoritmo di calcolo sia la procedura di calibrazione ed analizzate le problematiche legate alle grandezze di riferimento. Sono state inoltre individuate le specifiche variabili che possono incidere sul dato dosimetrico ed infine esposti i risultati di interconfronti sperimentali e di calcolo con tecnica Monte Carlo.

  18. Development of an automated informatic system, for the evaluation of damage in plastics and minerals

    International Nuclear Information System (INIS)

    Hidalgo V, V.; Lopez G, A.D.; Ledezma F, L.E.; Segovia R, A.; Balcazar, M.

    2008-01-01

    A computer system of pattern recognition to evaluate automatically the damages registered by positive ions in minerals and plastics was developed. In the case of minerals the apatite in which was achievement to recognize and to count the damages by spontaneous fission of the uranium contained in her was selected. The selected plastic was the CR39, in which was possible to obtain the distribution of the diameters of the you give you taken place by slight ions in this plastic. In both cases, the recognition of patterns you bases on Ision for Computer, using the methodology described by Gonzalez and Woods [6]. The technique consists in: Acquisition of the Image, Pre-prosecution, Segmentation, Description and Classification; the computer system you development making use of the software Matlab version 7. The Apatita you selects for their importance in the one dated geologic and the determination of the thermal history, both of importance in the oil prospecting. In the case of the CR39 their importance resides in its wide and massive use as dosimetro of neutrons, determination of environmental Radon and detection of nuclear reactions of low section. (Author)

  19. Development of a head phantom to be used for quality control in stereotactic radiosurgery

    International Nuclear Information System (INIS)

    Barbosa, Nilseia Aparecida

    2010-05-01

    It was designed and developed a geometric acrylic head phantom (GHP) for Quality Assurance (QA) in Stereotactic Radiosurgery (SRS). Inside the phantom there are inserts that are able to accommodate acrylic targets representing the tumor tissue and organ at risk in the region cranial brain, the brain stem. The tumor tissue is represented by two semi-spheres of acrylic with a diameter of 13.0 mm and cavities in the central region for accommodation of a TLD-100 detector and a small radiochromic EBT Gafchromic filmstrip. The brain stem is represented by the two parts of acrylic cylinder with a diameter 18.0 mm, 38.0 mm length and cavities along the central region to accommodate the 5 detectors TLD-100 and yet another of EBT film. The distance tumor - brain stem is 2.0 mm. The experimental setup was filled with water, attached to the stereotactic frame to determine the coordinates of the target and underwent computed tomography (CT). Cf images were transferred to the SRS planning system BrainLab (BrainScan). The contours of the lesion and organ at risk were delineated and, through the technique of multiple circular arcs, the planning was conduced with five arches, one isocenter and a collimator of 17.5 mm from the combination between the table and gantry . The dose delivered to the isocenter of the lesion was 3.0 Gy and the total coverage of tumor volume corresponds to the 75% isodose. This experimental arrangement is subjected to radiosurgery treatment, after which the dosimeters are evaluated and their responses compared with the values of planned doses. The linear accelerator used was a Varian CLlNAC 2300 CID, photon beam of 6 MV, installed at the National Cancer Institute (INCA). For verification of dose distributions in 3D, the films were irradiated in three planes: sagittal, caronal and axial. The .films were scanned and digitized on a scanner Microtek ScanMaker 9800XL model. The dose distributions in irradiated films were compared with the distributions of doses

  20. BaSO4:Eu as an energy independent thermoluminescent radiation dosimeter for gamma rays and C6+ ion beam

    Science.gov (United States)

    Sharma, Kanika; Bahl, Shaila; Singh, Birendra; Kumar, Pratik; Lochab, S. P.; Pandey, Anant

    2018-04-01

    BaSO4:Eu nanophosphor is delicately optimized by varying the concentration of the impurity element and compared to the commercially available thermoluminescent dosimeter (TLD) LiF:Mg,Ti (TLD-100) and by extension also to CaSO4:Dy (TLD-900) so as to achieve its maximum thermoluminescence (TL) sensitivity. Further, the energy dependence property of this barite nanophosphor is also explored at length by exposing the phosphor with 1.25 MeV of Co-60, 0.662 MeV of Cs-137, 85 MeV and 65 MeV of Carbon ion beams. Various batches of the phosphor at hand (with impurity concentrations being 0.05, 0.10, 0.20, 0.50 and 1.00 mol%) are prepared by the chemical co-precipitation method out of which BaSO4:Eu with 0.20 mol% Eu exhibits the maximum TL sensitivity. Further, the optimized nanophosphor exhibits a whopping 28.52 times higher TL sensitivity than the commercially available TLD-100 and 1.426 times higher sensitivity than TLD-900, a noteworthy linear response curve for an exceptionally wide range of doses i.e. 10 Gy to 2 kGy and a simple glow curve structure. Furthermore, when the newly optimized nanophosphor is exposed with two different energies of gamma radiations, namely 1.25 MeV of Co-60 (dose range- 10-300 Gy) and 0.662 MeV of Cs-137 (dose range- 1-300 Gy), it is observed that the shape and structure of the glow curves remain remarkably similar for different energies of radiation while the TL response curve shows little to no variation. When exposed to different energies of carbon ion beam BaSO4:Eu displays energy independence at lower doses i.e. from 6.059 to 14.497 kGy. Finally, even though energy independence is lost at higher doses, the material shows high sensitivity to higher energy (85 MeV) of carbon beam compared to the lower energy (65 MeV of C6+) and saturation is apparent only after 121.199 kGy. Therefore the present nanophosphor displays potential as an energy independent TLD.

  1. Dosimetric analysis for photon and electron beams in Whole body irradiation

    International Nuclear Information System (INIS)

    Hurtado G, M.

    1998-01-01

    To initiate the Whole body irradiation as an alternative for the treatment of the hematological diseases, leukemia and assistant for the osseous marrow transplantation, it may be taken account the application of International Protocols about control and quality assurance. It is established the intercomparison by the different dosimetric methods: cylindrical ionization chambers and parallel plane, radiographic emulsion film, semiconductor diodes (Mosfet transistors) and TLD-100 thermoluminescent crystals, obtained measurements for 140 x 140 cm 2 fields and large distances 340 cm respect conventional fields in Radiotherapy. The in vitro dosimetry was realized at the Universal Anthropomorphic puppet Alderson Rando basically with the cylindrical crystals (1 mm diameter) of TLD-100 lithium fluoride. It was obtained the dose value with a 0.6 cm 3 cylindrical ionization chamber and the Farmer electrometer for Whole body irradiation (ICT) with photons for electrons and were obtained values with the Markus plane parallel camera. Knowing the dose rate value to the source-surface distance DFS= 80 cm, it was calibrated the crystals with the reference radiation beam of 60 Co for obtaining the response curve: Dose vs. Tl lecture. It was characterized the 10 % of the total population for 300 crystals for applying the statistics corresponding. The luminescence curve obtained of Gaussian form was considered satisfactory by its stability during the pre-anneal lecture and anneal process, getting the main peak lecture at 300 Centigrade according to assigned parameters at lecture equipment TLD Harshaw model 4500. The results indicate the functional dependence with the distance DFS= 340 cm for the following depth PPD, the relations TMR and TPR, the TAR is not calculated by the increment of the dispersion in air. The penumbra increment indicates an increase of the radiation field respect of luminous field. The dispersion angle q 1 respect at the field central axis was determined and was

  2. Dosimetric studies in diagnostic radiology

    International Nuclear Information System (INIS)

    Mohamadain, K. E. M.

    2004-04-01

    A dosimetric study in pediatric radiology and adult patients was currently being carried out at the pediatrics units of two large hospitals in Rio de Janeiro city: IPPMG (Instituto de Pediatric e Puericultura Martagao Gesteira, University hospital of federal University of Rio de Janeiro), IFF (Instituto Fernandes Figueira, FIOCRUZ) and Hospital Geral de Bonsucesso, a large public hospital in Rio de Janeiro city (HGB) Brazil. The dosimetric study was also performed at three pediatrics units in Sudan, namely, Ahmed Gasim, Khartoum and Omdurman hospitals. For chest x-ray examination the entrance skin dose(ESD) for AP, PA and LAT projections of pediatric patients, and the scattered dose at the thyroid, ovary and gonads have been obtained with thermoluminescent dosimeters (TLD) and with use of a software package Dosecal in thr Brazilian hospitals, and with the software dosecal in the Sudanese hospitals.The aim of this work was to estimate the entrance skin dose (ESD), the effective dose (ED) and the body organ dose (BOD) for chest x-ray exposure in pediatric patients, and different exams for adults patients, and to compare the results obtained in the tow Countries Sudan and Brazil with the reference dose level. For ESD evaluation of the chest x-ray, three different TL dosimeters have been used, namely LiF: Mg, Ti (TLD 100) CaSo 4 : Dy and LiF:Mg, Cu,P (TLD 100 H). The age intervals considered were: 0-1 years, 1-5 years, 5-10 years and 10-15 years. The results obtained with all dosimeters were in good agreement with, those obtained by the dosecal software, especially for AP and PA projection. However, some discrepancies were found for the LAT projection. The results within Brazil were some what consistent while in Sudan, large difference were observed, it was also noted that the doses in Brazil hospitals were less than the reference dose levels while in Sudanese hospitals the doses were higher than the reference dose levels. For adult patients only the software dosecal

  3. Development of a head phantom to be used for quality control in stereotactic radiosurgery; Desenvolvimento de um simulador de cabeca para a aplicacao no controle da qualidade de radiocirurgia estereotaxica

    Energy Technology Data Exchange (ETDEWEB)

    Barbosa, Nilseia Aparecida

    2010-05-15

    It was designed and developed a geometric acrylic head phantom (GHP) for Quality Assurance (QA) in Stereotactic Radiosurgery (SRS). Inside the phantom there are inserts that are able to accommodate acrylic targets representing the tumor tissue and organ at risk in the region cranial brain, the brain stem. The tumor tissue is represented by two semi-spheres of acrylic with a diameter of 13.0 mm and cavities in the central region for accommodation of a TLD-100 detector and a small radiochromic EBT Gafchromic filmstrip. The brain stem is represented by the two parts of acrylic cylinder with a diameter 18.0 mm, 38.0 mm length and cavities along the central region to accommodate the 5 detectors TLD-100 and yet another of EBT film. The distance tumor - brain stem is 2.0 mm. The experimental setup was filled with water, attached to the stereotactic frame to determine the coordinates of the target and underwent computed tomography (CT). Cf images were transferred to the SRS planning system BrainLab (BrainScan). The contours of the lesion and organ at risk were delineated and, through the technique of multiple circular arcs, the planning was conduced with five arches, one isocenter and a collimator of 17.5 mm from the combination between the table and gantry . The dose delivered to the isocenter of the lesion was 3.0 Gy and the total coverage of tumor volume corresponds to the 75% isodose. This experimental arrangement is subjected to radiosurgery treatment, after which the dosimeters are evaluated and their responses compared with the values of planned doses. The linear accelerator used was a Varian CLlNAC 2300 CID, photon beam of 6 MV, installed at the National Cancer Institute (INCA). For verification of dose distributions in 3D, the films were irradiated in three planes: sagittal, caronal and axial. The .films were scanned and digitized on a scanner Microtek ScanMaker 9800XL model. The dose distributions in irradiated films were compared with the distributions of doses

  4. Evaluation of organ doses and specific k effective dose of 64-slice CT thorax examination using an adult anthropomorphic phantom

    International Nuclear Information System (INIS)

    Hashim, S.; Karim, M.K.A.; Bakar, K.A.; Sabarudin, A.; Chin, A.W; Saripan, M.I.; Bradley, D.A.

    2016-01-01

    The magnitude of radiation dose in computed tomography (CT) depends on the scan acquisition parameters, investigated herein using an anthropomorphic phantom (RANDO®) and thermoluminescence dosimeters (TLD). Specific interest was in the organ doses resulting from CT thorax examination, the specific k coefficient for effective dose estimation for particular protocols also being determined. For measurement of doses representing five main organs (thyroid, lung, liver, esophagus and skin), TLD-100 (LiF:Mg, Ti) were inserted into selected holes in a phantom slab. Five CT thorax protocols were investigated, one routine (R1) and four that were modified protocols (R2 to R5). Organ doses were ranked from greatest to least, found to lie in the order: thyroid>skin>lung>liver>breast. The greatest dose, for thyroid at 25 mGy, was that in use of R1 while the lowest, at 8.8 mGy, was in breast tissue using R3. Effective dose (E) was estimated using three standard methods: the International Commission on Radiological Protection (ICRP)-103 recommendation (E103), the computational phantom CT-EXPO (E(CTEXPO)) method, and the dose-length product (DLP) based approach. E103 k factors were constant for all protocols, ~8% less than that of the universal k factor. Due to inconsistency in tube potential and pitch factor the k factors from CTEXPO were found to vary between 0.015 and 0.010 for protocols R3 and R5. With considerable variation between scan acquisition parameters and organ doses, optimization of practice is necessary in order to reduce patient organ dose. - Highlights: • Using TLD-100 dosimeters and a RANDO phantom 5 CT thorax protocol organ doses were assessed. • The specific k coefficient for effective dose estimation of protocols differed with approach. • Organ dose was observed to decrease in the order: thyroid>skin>lung>liver>breast. • E103 k factors were constant for all protocols, lower by ~8% compared to the universal k factor.

  5. The effect of different dopant concentration of tailor-made silica fibers in radiotherapy dosimetry

    Science.gov (United States)

    Begum, Mahfuza; Mizanur Rahman, A. K. M.; Zubair, H. T.; Abdul-Rashid, H. A.; Yusoff, Z.; Begum, Mahbuba; Alkhorayef, M.; Alzimami, K.; Bradley, D. A.

    2017-12-01

    In thermoluminescence (TL) material dopant concentration has an important effect on their characteristics as a ;radiation-sensor;. The study investigates dosimetric properties of four different concentration (4 mol%, 5 mol%, 7 mol% and 25 mol%) tailor-made Ge-doped silica fibers. The intention is to seek development of alternative TL materials that offer exceptional advantages over existing passive systems of dosimetry, including improved spatial resolution, a water impervious nature and low cost. Photon beams (6 MV and 10 MV) from a clinical linear accelerator were used for irradiation of the fiber samples over radiation therapy doses, ranging from 0.5 Gy to 8 Gy. SEM-EDX analysis was also performed to investigate the homogeneity of distribution of Ge dopant concentration from the fiber samples. The results of measurement were also compared with two of the more commonly used standard TLDs, TLD-100 (LiF: Mg,Ti-7.5% 6LiF) and TLD-700 ((7LiF: Mg,Ti-99.9%7LiF) chips respectively. The TL intensity of the fiber samples was found to strongly depend on Ge dopant concentration, with samples showing enhanced TL yields with decreasing Ge dopant concentration. 4 mol% Ge-doped silica fiber provided the greatest response whereas the 25 mol% samples showed the least, indicative of the well-known concentration quenching effects All fiber TLDs provided linear dose response over the delivered radiotherapy dose-range, the fibers also showing a weak dependence on photon beam energies in comparing the TL yields at 6 and 10 MV. The fading behavior of the different concentration Ge doped TLD-materials were also measured over a period of thirty (30) days subsequent to irradiation. The relative sensitivity of the samples with respect to standard TLD-100 were found to be 0.37, 0.26, 0.13 and 0.02 in respect of the 4, 5, 7 and 25 mol% fibers. The primary dosimetry peak, which was by far the most prominent of any other feature covered by the glow curve, was found to be around 244 °C using

  6. Thermoluminescence characteristics of different dimensions of Ge-doped optical fibers in radiation dosimetry

    Energy Technology Data Exchange (ETDEWEB)

    Begum, M.; Mizanur R, A. K. M.; Abdul R, H. A.; Yusoff, Z. [Multimedia University, Faculty of Engineering, 63100 Cyberjaya, Selangor Darul Ehsan (Malaysia); Begum, M. [Bangladesh Atomic Energy Commission, E-12/A, Agargaon, Sher-e-Blanga Nagar Dhaka-1207 (Bangladesh); Mat-Sharif, K. A. [Lingkaran Teknokrat Timur, Telekom Research and Development, 63000 Cyberjaya, Selangor Darul Ehsan (Malaysia); Amin, Y. M. [University of Malaya, Faculty of Science, Depatment of Physics, 50603 Kuala Lumpur (Malaysia); Bradley, D. A., E-mail: go2munmun@yahoo.com [University of Surrey, Department of Physics, Guildford GU2 7XH (United Kingdom)

    2014-08-15

    Important thermoluminescence (Tl) properties of five (5) different core sizes Ge doped optical fibers have been studied to develop new Tl material with better response. These are drawn from same preform applying different speed and tension during drawing phase. The results of the investigations are also compared with most commonly used standard TLD-100 chips (LiF:Mg,Ti) and commercial multimode Ge doped optical fiber (Yangtze Optical Fiber, China). Scanning Electron Microscope (Sem) and EDX analysis of the fibers are also performed to map Ge distribution across the deposited region. Standard Gamma radiation source in SSDL (Secondary Standard Dosimetry Lab) was used for irradiation covering dose range from 1 Gy to 10 Gy. The essential dosimetric parameters that have been studied are Tl linearity, reproducibility and fading. Prior to irradiation all samples ∼0.5 cm length are annealed at temperature of 400 grades C for 1 hour period to standardize their sensitivities and background. Standard TLD-100 chips are also annealed for 1 hour at 400 grades C and subsequently 2 hours at 100 grades C to yield the highest sensitivity. Tl responses of these fibers show linearity over a wide gamma radiation dose that is an important property for radiation dosimetry. Among all fibers used in this study, 100 μm core diameter fiber provides highest response that is 2.6 times than that of smallest core (20 μm core) optical fiber. These fiber-samples demonstrate better response than commercial multi-mode optical fiber and also provide low degree of fading about 20% over a period of fifteen days for gamma radiation. Effective atomic number (Z{sub eff}) is found in the range (13.25 to 13.69) that is higher than soft tissue (7.5) however within the range of human-bone (11.6-13.8). All the fibers can also be re-used several times as a detector after annealing. Tl properties of the Ge-doped optical fibers indicate promising applications in ionizing radiation dosimetry. (author)

  7. Thermoluminescence characteristics of different dimensions of Ge-doped optical fibers in radiation dosimetry

    International Nuclear Information System (INIS)

    Begum, M.; Mizanur R, A. K. M.; Abdul R, H. A.; Yusoff, Z.; Begum, M.; Mat-Sharif, K. A.; Amin, Y. M.; Bradley, D. A.

    2014-08-01

    Important thermoluminescence (Tl) properties of five (5) different core sizes Ge doped optical fibers have been studied to develop new Tl material with better response. These are drawn from same preform applying different speed and tension during drawing phase. The results of the investigations are also compared with most commonly used standard TLD-100 chips (LiF:Mg,Ti) and commercial multimode Ge doped optical fiber (Yangtze Optical Fiber, China). Scanning Electron Microscope (Sem) and EDX analysis of the fibers are also performed to map Ge distribution across the deposited region. Standard Gamma radiation source in SSDL (Secondary Standard Dosimetry Lab) was used for irradiation covering dose range from 1 Gy to 10 Gy. The essential dosimetric parameters that have been studied are Tl linearity, reproducibility and fading. Prior to irradiation all samples ∼0.5 cm length are annealed at temperature of 400 grades C for 1 hour period to standardize their sensitivities and background. Standard TLD-100 chips are also annealed for 1 hour at 400 grades C and subsequently 2 hours at 100 grades C to yield the highest sensitivity. Tl responses of these fibers show linearity over a wide gamma radiation dose that is an important property for radiation dosimetry. Among all fibers used in this study, 100 μm core diameter fiber provides highest response that is 2.6 times than that of smallest core (20 μm core) optical fiber. These fiber-samples demonstrate better response than commercial multi-mode optical fiber and also provide low degree of fading about 20% over a period of fifteen days for gamma radiation. Effective atomic number (Z eff ) is found in the range (13.25 to 13.69) that is higher than soft tissue (7.5) however within the range of human-bone (11.6-13.8). All the fibers can also be re-used several times as a detector after annealing. Tl properties of the Ge-doped optical fibers indicate promising applications in ionizing radiation dosimetry. (author)

  8. Production of LiF films for dosimetric thermoluminescence application; Producao de filmes de LiF para aplicacao em dosimetria termoluminescente

    Energy Technology Data Exchange (ETDEWEB)

    Mauricio, Claudia Lucia de Pinho

    2000-12-01

    This work studies the LiF monolayer and multilayer polycrystalline film's dosimetric properties. The films were produced by electron beam evaporation technique in aluminium and stainless steel substrates maintained at several temperatures. As dosimetric variable, the intensity of the thermoluminescent (TL) glow curve of the films was used. effects of the substrate type and temperature; of the addition of layers of Mg F{sub 2} NaF and Cu F{sub 2} to the LiF films; and of thermal treatments in the TL response of the produced films were studied. The microstructural characterization of the films was accomplished through measures of scanning electronic microscopy and grazing incidence X-rays diffraction analysis. The dosimetric characterization was made of gamma radiation exposure in a {sup 60} Co source, with kerma from 0,1 to 500 Gy. Studies of reproducibility, homogeneity, stability and other environmental effects were also made. LiF and Cu F{sub 2}: LiF; Mg F{sub 2} films were the only ones that presented mechanical stability and reproducibility of the TL emission. There is a strong indication of some correlation between the residual tension fields inside the films and the intensity of its TL emission peaks. LiF monolayer films present supralinear behaviour from 0,2 to 100 Gy. These films present a main TL glow peak around 150 deg C, whose half-time is about 30 days. Its volumetric sensitivity can reach about 60 times that of LiF powder and about 0,25 that of TLD100 (LiF:Mg, Ti commercial dosimeter from Harshaw Chemical Co.) The homogeneity and reproducibility inside a same film batch is better than 12% for 95% confidence level. Cu F{sub 2} : LiF: Mg F{sub 2} films present linear behaviour from 3 to 500 Gy and its main TL glow peak around 200 deg C did not present any fading for a a period of 30 days, in laboratory conditions. This glow peak is characteristic of the Mg doping of LiF, which confirms the diffusion of Mg ions from the Mg F{sub 2} layer to the Li

  9. The right choice: extremity dosemeter for different radiation fields

    International Nuclear Information System (INIS)

    Brasik, N.; Stadtmann, H.; Kindl, P.

    2005-01-01

    Full text: Measurements of weakly penetrating radiation in personal dosimetry present problems in the design of suitable detectors and in the interpretation of their readings. For the measurement of the individual beta radiation dose, personal dosemeter for the fingers/tips are required. In general, the dosemeters currently used for personal monitoring of beta and low energy photon doses suffer from an energy threshold problem because the detector and/or the filter are too thick. TLDs of a standard thickness can seriously underestimate personal skin doses, especially in external fields of weakly penetrating radiation fields. LiF:Mg, Cu, P is a promising TL material which allows the production of thin detectors with sufficient sensitivity. Dosimetric properties of two different types of extremity dosemeters, designed to measure the personal dose equivalent Hp(0.07), have been compared: LiF:Mg, Ti (TLD100) and LiF:Mg, Cu, P (TLD700H). The first one consists of 100 mg.cm -2 LiF:Mg, Ti (TLD 100) chip and a 35mg. cm -2 cap, the other consists of a 7mg. cm -2 layer of LiF:Mg, Cu, P (TLD-700H) powder and a 5mg. cm -2 cap. The evaluation was done in two steps: performance tests (ISO-12794) and measurements in real workplaces. In the first step type test results for beta calibration were compared. In addition calibration for low energy photon radiation according to ISO 4037-3 was carried out. In the second step, simultaneous measurements with both types of dosemeters were performed at workplaces, where radiopharmaceuticals containing different radioisotopes are prepared and applied. Practices in these fields are characterized by handling of high activities at very small distances between source and skin. The results from the comparison of the two dosemeter types are presented and analyzed with respect to different radiation fields. Experiments showed a satisfactory sensitivity for the thinner dosemeter (TLD 700H) for detecting beta radiation at protection levels and a good

  10. Production of LiF films for dosimetric thermoluminescence application

    International Nuclear Information System (INIS)

    Mauricio, Claudia Lucia de Pinho

    2000-12-01

    This work studies the LiF monolayer and multilayer polycrystalline film's dosimetric properties. The films were produced by electron beam evaporation technique in aluminium and stainless steel substrates maintained at several temperatures. As dosimetric variable, the intensity of the thermoluminescent (TL) glow curve of the films was used. effects of the substrate type and temperature; of the addition of layers of Mg F 2 NaF and Cu F 2 to the LiF films; and of thermal treatments in the TL response of the produced films were studied. The microstructural characterization of the films was accomplished through measures of scanning electronic microscopy and grazing incidence X-rays diffraction analysis. The dosimetric characterization was made of gamma radiation exposure in a 60 Co source, with kerma from 0,1 to 500 Gy. Studies of reproducibility, homogeneity, stability and other environmental effects were also made. LiF and Cu F 2 : LiF; Mg F 2 films were the only ones that presented mechanical stability and reproducibility of the TL emission. There is a strong indication of some correlation between the residual tension fields inside the films and the intensity of its TL emission peaks. LiF monolayer films present supralinear behaviour from 0,2 to 100 Gy. These films present a main TL glow peak around 150 deg C, whose half-time is about 30 days. Its volumetric sensitivity can reach about 60 times that of LiF powder and about 0,25 that of TLD100 (LiF:Mg, Ti commercial dosimeter from Harshaw Chemical Co.) The homogeneity and reproducibility inside a same film batch is better than 12% for 95% confidence level. Cu F 2 : LiF: Mg F 2 films present linear behaviour from 3 to 500 Gy and its main TL glow peak around 200 deg C did not present any fading for a a period of 30 days, in laboratory conditions. This glow peak is characteristic of the Mg doping of LiF, which confirms the diffusion of Mg ions from the Mg F 2 layer to the LiF layer. The TL volumetric sensitivity of these

  11. Dosimetric analysis for photon and electron beams in Whole body irradiation; Analisis dosimetrico para haces de fotones y electrones en irradiacion corporal total

    Energy Technology Data Exchange (ETDEWEB)

    Hurtado G, M. [Posgrado. Fisica Medica Radiologica. Universidad Nacional de Colombia, Bogota. Instituto Nacional de Cancerologia. Instituto Regional de Cancer de la Orinoquia. Hospital Regional de Villavicencio, Meta (Colombia)

    1998-12-31

    To initiate the Whole body irradiation as an alternative for the treatment of the hematological diseases, leukemia and assistant for the osseous marrow transplantation, it may be taken account the application of International Protocols about control and quality assurance. It is established the intercomparison by the different dosimetric methods: cylindrical ionization chambers and parallel plane, radiographic emulsion film, semiconductor diodes (Mosfet transistors) and TLD-100 thermoluminescent crystals, obtained measurements for 140 x 140 cm{sup 2} fields and large distances 340 cm respect conventional fields in Radiotherapy. The in vitro dosimetry was realized at the Universal Anthropomorphic puppet Alderson Rando basically with the cylindrical crystals (1 mm diameter) of TLD-100 lithium fluoride. It was obtained the dose value with a 0.6 cm{sup 3} cylindrical ionization chamber and the Farmer electrometer for Whole body irradiation (ICT) with photons for electrons and were obtained values with the Markus plane parallel camera. Knowing the dose rate value to the source-surface distance DFS= 80 cm, it was calibrated the crystals with the reference radiation beam of {sup 60} Co for obtaining the response curve: Dose vs. Tl lecture. It was characterized the 10 % of the total population for 300 crystals for applying the statistics corresponding. The luminescence curve obtained of Gaussian form was considered satisfactory by its stability during the pre-anneal lecture and anneal process, getting the main peak lecture at 300 Centigrade according to assigned parameters at lecture equipment TLD Harshaw model 4500. The results indicate the functional dependence with the distance DFS= 340 cm for the following depth PPD, the relations TMR and TPR, the TAR is not calculated by the increment of the dispersion in air. The penumbra increment indicates an increase of the radiation field respect of luminous field. The dispersion angle q{sub 1} respect at the field central axis

  12. Del Laberinto Hasta el Camino Hacia la Recuperación de la Violencia

    Directory of Open Access Journals (Sweden)

    Roberta de Alencar-Rodrigues

    2013-01-01

    Full Text Available Este artículo analiza los factores que obstaculizan y facilitan el cese o la reducción de la violencia de género en la pareja. Según la revisión de literatura esos factores están relacionados con recursos externos y personales. Los recursos externos abarcan la respuesta de la red social y de las instituciones ante el maltrato, y el acceso a los recursos materiales. Los recursos personales comprenden las estrategias de afrontamiento, resiliencia y creencias. Se propone que la recuperación de la violencia depende de la posibilidad de la mujer contar con recursos externos adecuados y de conectar con sus recursos personales. Comprender esos recursos permite la promoción de intervenciones que instrumentalicen las redes y las instituciones y favorezcan el empoderamiento para que ellas resistan a la violencia.

  13. Relationship Between Social and Personal Variables, Body Image, and Wellbeing at Work of Nutritionists

    Directory of Open Access Journals (Sweden)

    MICHELE CRISTINA FERREIRA

    2014-01-01

    Full Text Available El objetivo de este estudio fue investigar el bie- nestar en una muestra aleatoria de nutricionistas, utilizando la imagen corporal y las variables so - ciales y personales como factores causales, en un estudio exploratorio y transversal. El trabajo es - tadístico incluyó análisis descriptivos, pruebas t, ANOVA s y regresión lineal. Los 242 participantes manifestaron gozar frecuentemente de bienes - tar en el trabajo ( M =3.8; el 25,6% presentó una imagen corporal levemente distorsionada; el 14,5% moderadamente distorsionada y el 7,5% severamente distorsionada. Las variables socia - les y personales, como tener hijos y los ingresos personales, se asociaron con el bienestar. La ima - gen corporal tuvo un impacto significativamente negativo sobre el 3.2% del bienestar.

  14. Características de las relaciones familiares y escolares y roles en la dinámica bullying en estudiantes de Educación Secundaria Obligatoria

    OpenAIRE

    Piñero Ruiz, Eugenia

    2010-01-01

    El trabajo de investigación que se presenta en esta tesis doctoral pretende estudiar algunas características familiares, personales y escolares y su relación con las manifestaciones de violencia y victimización en los centros escolares de Educación Secundaria Obligatoria de la Región de Murcia. Se aplicaron varios instrumentos anónimos que midieron la frecuencia de la violencia escolar y la victimización, y que aportaron datos sociodemográficos, personales y familiares. Además, se aplicó el t...

  15. Características de las relaciones familiares y escolares y roles en la dinámica bullying en estudiantes de educación secundaria obligatoria

    OpenAIRE

    Piñero Ruiz, Eugenia

    2010-01-01

    El trabajo de investigación que se presenta en esta tesis doctoral pretende estudiar algunas características familiares, personales y escolares y su relación con las manifestaciones de violencia y victimización en los centros escolares de Educación Secundaria Obligatoria de la Región de Murcia. Se aplicaron varios instrumentos anónimos que midieron la frecuencia de la violencia escolar y la victimización, y que aportaron datos sociodemográficos, personales y familiares. Además, se aplicó el t...

  16. The importance of professional competencies in the development of emotional intelligence

    OpenAIRE

    Marroquín, Edmundo; Sastre, Miguel Ángel; Danvila, Ignacio

    2013-01-01

    El concepto de Inteligencia Emocional se ha convertido en uno de los tópicosmás analizados tanto por académicos como por profesionales de recursos humanosy dirección de empresas. Esto se debe al impacto que tiene en los logros personales yprofesionales. La importancia de poseer las adecuadas competencias personales y profesionalessuele conllevar mayores garantías de éxito en el ámbito laboral. Este artículorealiza una revisión de este concepto y detalla los principales modelos de competencias...

  17. Diseño de una web 2.0 sobre el turismo cultural en la comarca del Garraf en el ámbito de las TIC

    OpenAIRE

    Hidalgo Álvarez, Raquel

    2009-01-01

    En la actualidad existen muchas páginas Web donde colectivos de gente, organizaciones o usuarios personales se dan a conocer. Para crear estas páginas actualmente se pueden encontrar muchas herramientas que permiten la creación de páginas personales con pocos pasos. Estas páginas son fruto de plantillas, que luego no pueden ser modificadas o muy poco dinámicas y muy similares entre ellas. Para la creación de esta Web se ha partido desde cero para obtener una Web lo ...

  18. Del laberinto hasta el camino hacia la recuperación de la violencia

    OpenAIRE

    Alencar Rodrigues, Roberta de

    2013-01-01

    Este artículo analiza los factores que obstaculizan y facilitan el cese o la reducción de la violencia de género en la pareja. Según la revisión de literatura esos factores están relacionados con recursos externos y personales. Los recursos externos abarcan la respuesta de la red social y de las instituciones ante el maltrato, y el acceso a los recursos materiales. Los recursos personales comprenden las estrategias de afrontamiento, resiliencia y creencias. Se propone que la recuperación de ...

  19. Perfiles docentes en diversos contextos: personalidad, autoconcepto y compromiso educativo

    OpenAIRE

    Córdova Ávila, Susana Victoria

    2014-01-01

    Las personas nos desarrollamos en medio de contextos complejos y multidimensionales, lo que somos es producto de nuestras propias características personales y de las influencias del entorno en el que interactuamos. Es desde el Perú, como país diverso y con culturas milenarias, que planteamos esta investigación que puede ser ubicada en el marco de las ciencias sociales y de la educación. La complejidad de los procesos personales y socioeducativos peruanos nos hizo tomar la ruta de la psicologí...

  20. Factores que favorecen el desarrollo de una actitud positiva hacia las actividades académicas

    OpenAIRE

    María Luisa Naranjo Pereira

    2010-01-01

    Este artículo presenta una investigación de tipo descriptivo, cuyo objetivo es analizar los factores personales que favorecen el desarrollo de una actitud positiva hacia las actividades académicas, de acuerdo con la opinión de dos grupos de estudiantes de décimo año. Ella está constituida por un constructo principal: la actitud positiva hacia las actividades académicas, y un subconstructo: los factores personales que favorecen esas actitudes. Los aspectos que integran este subconstructo son l...

  1. La columna con gancho de Manuel Alcántara o las reminiscencias de un ex cronista de boxeo

    Directory of Open Access Journals (Sweden)

    Emy Armañanzas Sodupe

    2009-05-01

    Full Text Available Las expresiones del boxeo conforman un lugar común empleado frecuentemente fuera de este ámbito: “peso pesado de la política”, “encajar un duro golpe”, entre otras. Encontramos estos referentes en las columnas personales que Manuel Alcántara publica en Vocento. La regularidad y el modo de aparición de tan agonístico ítem se analizan en una muestra aleatoria de 1.500 columnas personales publicadas entre 1983 y 2008.

  2. Guía de buenas prácticas de seguridad informática en el tratamiento de datos de salud para el personal sanitario en atención primaria

    OpenAIRE

    Ana Sánchez-Henarejos; José Luis Fernández-Alemán; Ambrosio Toval; Isabel Hernández-Hernández; Ana Belén Sánchez-García; Juan Manuel Carrillo de Gea

    2014-01-01

    Con la introducción de la historia clínica digital surge la necesidad de reforzar la seguridad de los datos personales de salud para garantizar su privacidad. A pesar de la gran cantidad de medidas de seguridad técnicas y de recomendaciones existentes para el ámbito sanitario, hay un aumento en las violaciones de la privacidad de los datos personales de los pacientes en centros sanitarios, en muchos casos como consecuencia de errores o descuidos de los profesionales sanitarios. En este trabaj...

  3. La inteligencia emocional como clave de éxito en la empresa

    OpenAIRE

    Pérez-González, Mario

    2013-01-01

    En el siglo XXI, las empresas ya no contratan solo basándose en el expediente académico o la experiencia profesional, sino que demandan de los trabajadores una serie de características personales que exige dominar las cinco habilidades personales de las cuales está compuesta la inteligencia emocional: Autoconocimiento, autorregulación, motivación, empatía y habilidades sociales. Sin embargo en la asignatura de 2º de Bachillerato, Economía de la empresa no se hace referencia alguna a esta nuev...

  4. Diferencias entre los niveles de ansiedad en estudiantes de pregrado de ingeniería de la Universidad de Antioquia, 2017

    OpenAIRE

    González Correa, Alexander; Hernández Ramírez, Eliana María

    2017-01-01

    El estudio de la deserción académica es de interés para todos los gobiernos, debido a que la educación es una herramienta esencial en el desarrollo de un país. En Colombia, se han identificado tres factores asociados a la deserción: la orientación vocacional, la capacidad económica y el rendimiento académico –RA-. Este último puede estar influenciado por aspectos evaluativos, personales y del contexto educativo. La salud mental hace parte de los aspectos personales, siendo la ansiedad una de ...

  5. Positiv afvigelse er en brugbar metode

    DEFF Research Database (Denmark)

    Frost, Helen

    2014-01-01

    Positiv afvigelse medfører, at man skal involvere patienter og personale i problemløsning og anvende de metoder, som man benytter, der hvor praksis og patientforløb lykkes. Nogle afdelinger eller hospitaler har succes med tingene, hvorfor?......Positiv afvigelse medfører, at man skal involvere patienter og personale i problemløsning og anvende de metoder, som man benytter, der hvor praksis og patientforløb lykkes. Nogle afdelinger eller hospitaler har succes med tingene, hvorfor?...

  6. Ionizing radiation source detection by personal TLD

    International Nuclear Information System (INIS)

    Marinkovic, O.; Mirkov, Z.

    2002-01-01

    The Laboratory for personal dosimetry has about 3000 workers under control. The most of them work in medicine. Some institutions, as big health centers, have different ionizing radiation sources. It is usefull to analyze what has been the source of irradiation, special when appears a dosimeter with high dose. Personal dosimetry equipment is Harshaw TLD Reader Model 6600 and dosimeters consist of two chips LiF TLD-100 assembled in bar-coded cards which are wearing in holders with one tissue-equivalent filter (to determine H(10)) and skin-equivalent the other (to determine H(0.07)). The calibration dosimeters have been irradiated in holders by different sources: x-ray (for 80keV and 100keV), 6 0C o, 9 0S r (for different distances from beta source) and foton beem (at radiotherapy accelerator by 6MeV, 10MeV and 18MeV). The dose ratio for two LiF cristals was calculated and represented with graphs. So, it is possible to calculate the ratio H(10)/H(0.07) for a personal TLD and analyze what has been the source of irradiation. Also, there is the calibration for determination the time of irradiation, according to glow curve deconvolution

  7. Alumina as a thermoluminescent material for personnel dosimetry

    International Nuclear Information System (INIS)

    Beinsteiner, J.

    1980-06-01

    In this paper the possible use of aluminium for dosimeters is investigated. The thermoluminescence recovery should be enhanced by different forms of doping and the form of the dosimeter should give reproductable results. Doping was done by coprecipitation of the additive with an Al salt from aqueous solutions and then converting to the oxides by heating. Doping with 850 ppm Tb 2 O 3 gives a 50 fold enhancement of the sensitivity. The emission of light is in the blue range. The use of PTFE for matrix material is strongly restricted because PTFE absorbes too much of the blue light. Sintering in vacuum or in hydrogen converts Tb 4 O 7 into Tb 2 O 3 and the reaction Tb(III)-radiation, heat-Tb(II) activates the luminescence. Tablets of these material produced by sintering in hydrogen with peaks at 125 and 72 0 C are 13 times as sensitive as LiF (TLD-100) and are linear in the range till 5000R. Fading in one month is 20% but loss of information is 13% after the first day. An apparatus was built which allows a semiautomatical evaluation of 50 dosimeters. (P.W.)

  8. Study of radiation exposure profiles in interventional radiology professionals

    International Nuclear Information System (INIS)

    Bacchim Neto, Fernando A.; Alves, Allan F.F.; Alvarez, Matheus; Rosa, Maria E.D.; Miranda, Jose R.A.; Freitas, Carlos C.M. de; Moura, Regina; Pina, Diana R. de

    2014-01-01

    Interventional Radiology is the radiology area that provides the highest dose values to the medical staff. Recent surveys show that personal dosimeters may underestimate the radiation dose values in interventional physicians, especially in the extremities and crystalline. The objective of this work was to study the exposure levels to radiation from medical staff in different interventional radiology procedures. Therefore, thermoluminescent dosimeters type LiF: Mg, Ti (TLD-100) were used positioned in the main interventional physician and an assistant in the following locations: some inches below the crystalline, thyroid, chest, gonads, hand and foot. By comparing the values obtained with the annual reference dose levels in workers, maximum numbers of annual procedures were found. Altogether, there were 23 procedures evaluated: 10 diagnostics, 9 angioplasties and 4 stents. The maximum number of annual procedures were estimated by discounting the percentages of attenuation of radiological protection. For procedures of the type diagnosis, angioplasty and stent for the main interventionist, the maximum number of annual procedures were 641, 445 and 113 respectively, while for the interventionists assistants were 930, 1202 and 215 respectively. As each interventionist body region is subject to different levels of exposure, detailed studies of exposure in each region provide better conclusions about what actions are necessary to ensure radiological protection professionals

  9. Fabrication and characterization of new NaF: Eu3+ sintered phosphors exposed to beta particle irradiation

    International Nuclear Information System (INIS)

    Bernal, R.; Garcia H, A.R.; Cruz V, C.; Kitis, G.; Castano, V.M.

    2007-01-01

    Full text: NaF:Eu 3+ phosphors were synthesized by sintering after mixing NaF and EuCI 3 in an aqueous solution. The sintering conditions were thermal annealing at 750 C during 5 h under air atmosphere. When a 5 C/s heating rate was used, the characteristic glow curves of beta particle irradiated samples exhibit two TL maxima located at 128 C and 225 C, being the higher temperature peak the most intense. A peak located between 200 and 250 C is considered to have a position very suitable to assure good thermal stability of the stored TL, for which this phosphor is attractive for radiation dosimetry. The TL increased proportionally to dose increase in the range investigated (from 0.0083 to 42.5 Gy), with a linear behavior below 10 Gy followed by a sub linear one for higher doses. Under storage after irradiation, the peak at 225 C displayed a remarkable stability, and the TL fading revealed that the peak at 128 C is not a single peak. The sensitivity of this new phosphor relative to the TLD-100 dosimeter is ca. 1. (Author)

  10. Tl response of LiF: Mg, Cu, P+Ptfe at X rays of 24, 42 and 100 KeV

    International Nuclear Information System (INIS)

    Gonzalez M, P.R.; Tovar M, V.M.; Azorin N, J.; Furetta, C.; Quiroz C, M.C.

    2005-01-01

    In this work the obtained results of the irradiation of thermoluminescent dosemeters (Tl) of LiF: Mg,Cu,P + Ptfe with X rays for the effective radiation energy of 24, 42 and 100 keV, in an interval of Kerma in air in the sinus of the air between 0.05 and 1.0 Gy are presented. The rate of Kerma in air was determined with an ionization chamber PTW-1152, gauged by the Laboratoire Central des Industries Electriques (LCIE). As reference commercial TLD-100 dosemeters was used. The results showed that the studied Tl dosemeters presented a lineal response in the interval of mentioned Kerma. On the other hand the estimated Kerma with the Tl dosemeter in the calibration curves for X rays, were similar to the one measured with the previously gauged ionization chamber. The Tl of LiF: Mg, Cu, P + Ptfe, developed in the ININ, are highly reliable for X-ray dosimetry. (Author)

  11. Dosimetric impact of interplay effect in lung IMRT and VMAT treatment using in-house dynamic thorax phantom

    International Nuclear Information System (INIS)

    Mukhlisin; Pawiro, S A

    2016-01-01

    Tumor motion due to patient's respiratory is a significant problem in radiotherapy treatment of lung cancer. The purpose of this project is to study the interplay effect through dosimetry verification between the calculated and delivered dose, as well as the dosimetric impact of leaf interplay with breathing-induced tumor motion in IMRT and VMAT treatment. In this study, a dynamic thorax phantom was designed and constructed for dosimetry measurement. The phantom had a linear sinusoidal tumor motion toward superior-inferior direction with variation of amplitudes and periods. TLD-100 LiF:Mg,Ti and Gafchromic EBT2 film were used to measure dose in the midpoint target and the spinal cord. The IMRT and VMAT treatment had prescription dose of 200 cGy per fraction. The dosimetric impact due to interplay effect during IMRT and VMAT treatment were resulted in the range of 0.5% to -6.6% and 0.9% to -5.3% of target dose reduction, respectively. Meanwhile, mean dose deviation of spinal cord in IMRT and VMAT treatment were around 1.0% to -6.9% and 0.9% to -6.3%, respectively. The results showed that if respiratory management technique were not implemented, the presence of lung tumor motion during dose delivery in IMRT and VMAT treatment causes dose discrepancies inside tumor volume. (paper)

  12. Theory of thermoluminescence gamma dose response: The unified interaction model

    Science.gov (United States)

    Horowitz, Y. S.

    2001-09-01

    We describe the development of a comprehensive theory of thermoluminescence (TL) dose response, the unified interaction model (UNIM). The UNIM is based on both radiation absorption stage and recombination stage mechanisms and can describe dose response for heavy charged particles (in the framework of the extended track interaction model - ETIM) as well as for isotropically ionising gamma rays and electrons (in the framework of the TC/LC geminate recombination model) in a unified and self-consistent conceptual and mathematical formalism. A theory of optical absorption dose response is also incorporated in the UNIM to describe the radiation absorption stage. The UNIM is applied to the dose response supralinearity characteristics of LiF:Mg,Ti and is especially and uniquely successful in explaining the ionisation density dependence of the supralinearity of composite peak 5 in TLD-100. The UNIM is demonstrated to be capable of explaining either qualitatively or quantitatively all of the major features of TL dose response with many of the variable parameters of the model strongly constrained by ancilliary optical absorption and sensitisation measurements.

  13. The contribution of Teflon to the thermoluminescent signal

    International Nuclear Information System (INIS)

    German, U.; Weinstein, M.; Ben-Shachar; Pelled, O.

    1997-01-01

    In the thermoluminescent method, we are measuring the light emitted by the phosphor (called TL output), irradiated previously by ionizing radiation. There are several other effects, which can cause emission of light similar to the TL output, which can affect the results of personnel and environmental dosimetry, especially for low doses. It is described several such effects, as illumination of lithium fluoride thermoluminescent dosimeters, particularly with ultraviolet wavelengths. It was presented that the results of the glow curve of LiF:Mg,Ti chips, after exposure to different non-ionizing radiation (u.v., microwave, electric sparks). It has reviewed the reports of light induced signals in LiF ( I > 380 nm). These effects cause dosimeters to emit TL similar to that caused by exposure to ionizing These effects cause dosimeters to emit TL similar to that caused by exposure to ionizing radiation.A signal is received when heating teflon sheets, which contributes to the TL signal. It was pointed out that the light induced TL emission from the teflon has a glow peak 120 degree C. The purpose of the present work was to perform a quantitative evaluation of the glow contributed by the teflon used in the TLD cards employed by us Harshaw - TLD 100 for different storage conditions. (authors)

  14. Validation and dosimetric evaluation employing the techniques of TL and OSL of thermoluminescent materials for application in the dosimetry of clinical beams of electrons used in total irradiation of the skin - TSI

    International Nuclear Information System (INIS)

    Almeida, Shirlane Barbosa de

    2017-01-01

    In vivo dosimetry has become an important role for the treatment of total skin irradiation within a rigorous quality assurance program that should be an integral part of the radiotherapy departments. TSI dosimetry is difficult because of the complexity of the treatment in assessing dose uniformity and measuring the dose absorbed at shallow depths throughout the skin surface extent, resulting in a wide variation in dose distribution. The TLDs have proven to be very useful for the distribution and verification of the dose prescribed for the patient as the dose may differ from place to place due to patient body geometry, overlapping of structures and asymmetries of the radiation field. The use of TLDs in vivo can identify variations in the prescribed dose because its measurement accuracy and great precision. Several types of dosimeters have been used in the radiotherapy sectors, the most commonly used are Lithium Fluride (TLD-100), where it obtains a long history in this type of application. New dosimetric materials have gained great importance in the dosimetry of clinical electron beams, such as Dysprosium-doped Calcium Sulphate (TL) and Carbon doped (OSL) based Aluminum Oxide, This work evaluates the performance of the respective thermoluminescent dosimeters and the optically stimulated luminescence in the dosimetry of clinical electron beams used in total irradiation of the skin. (author)

  15. Study of Optically Stimulated Luminescence of LiF:Mg,Ti for beta and gamma dosimetry

    International Nuclear Information System (INIS)

    Matsushima, Luciana C.; Veneziani, Glauco R.; Campos, Letícia L.

    2013-01-01

    Modern advances in radiation medicine – radiodiagnosis, radiotherapy and interventional radiography – each present dosimetry challenges for the medical physicist that did not exist previously. In all of these areas a constant balance has to be made between the treatment necessary to destroy the tumor and the unnecessary exposure of healthy tissue. Innovative applications of OSL dosimetry are now appearing in each of these areas to help the medical physicist and oncologist design the most effective, and least deleterious, treatment for their patients. High sensitivity, precise delivery of light, fast readout times, simpler readers and easier automation are the main advantages of OSL in comparison with TLD. This work aimed to study the application of OSL technique using lithium fluoride dosimeters doped with magnesium and titanium (LiF:Mg,Ti) for application in beta and gamma dosimetry. -- Highlights: •Study of Optically Stimulated Luminescence of LiF:Mg,Ti and microLiF:Mg,Ti. •OSL response of TLD-100 dosimeters to beta and gamma radiation. •Analysis of repeatability and lowest levels of detection of detectors LiF:Mg,Ti

  16. Influence of dopants on the glow curve structure and energy dependence of LiF:Mg,Cu,Si detectors

    International Nuclear Information System (INIS)

    Knezevic, Z.; Ranogajec-Komor, M.; Miljanic, S.; Lee, J.I.; Kim, J.L.; Music, S.

    2011-01-01

    LiF thermoluminescent material doped with Mg, Cu and Si recently developed by the Korea Atomic Energy Research Institute (KAERI) has shown very good dosimetric properties. Since the thermoluminescence in LiF was found to be dependent on the proper combination of dopants, the investigation of the concentration and type of dopants is very important in developing and characterisation of new TL materials. The aim of this work was to determine the influence of type and concentration of activators on the glow curve structure, sensitivity, reproducibility and on the photon energy response of LiF:Mg,Cu,Si detectors. The energy response was studied in air and on the ISO water phantom in the range of mean photon energies between 33 keV and 164 keV. The morphology and local chemical composition of LiF:Mg,Cu,Si detectors were examined using high resolution scanning electron microscopy (FE-SEM). The results show that type and concentration of activators influence the glow curve and sensitivity. Different dopant concentrations did not show influence on the photon energy response. The sensitivity of LiF:Mg,Cu,Si detector with dopant concentration of Mg = 0.35 mol%, Cu = 0.025 mol% and Si = 0.9 mol% was very high (up to 65 times higher than that of TLD-100). The photon energy response of LiF:Mg,Cu,Si detectors containing all three dopants in various concentrations is in accordance with the IAEA recommendations for individual monitoring.

  17. Effect of the temperature and relative humidity in dosemeters used for personnel monitoring

    International Nuclear Information System (INIS)

    Antonio Filho, J.

    1982-12-01

    The systematics of the combined effect of temperature and humidity on photographic dosimeters of the type Agfa-Gevaert, Kodak type II, III and the thermoluminescent dosimeters LiF:Mg,Ti (TLD-100, Harshaw), D-CaSO 4 :Dy-0,4 (Teledyne), e CaSO 4 :Dy+NaCl (IPEN), used in personal monitoring in Brazil was investigated, in the temperature range of 20 0 C to 50 0 C and relative humidity of 65% to 95%, in order to determine the best manner of utilization of these detectors in Brazilian climatic conditions. The dosimeters were studied in different forms of packing-sheet such as aluminezed paper and polyethylene. For the determination of the systematics, the dosimeters were irradiated in three conditions: before, during and after of storage in climatic chambers to a maximum period of 60 days. It was found that the dosimetric filmes and thermoluminescent dosimeter CaSO 4 :Dy+NaCl without protection, presented a high dependence to temperature and humidity, and when protected presented good results. Therefore, the best manner of utilization of these monitors in environments with relative humidity and temperature greater them 75% and 30 0 C respectively, is achieved with the protection of aluminized paper. The LiF:Mg,Ti and D+CaSO 4 :Dy-0,4 dosimeters can be utilized in their original form because they presented low dependence with humidity and temperature in the range studied. (Author) [pt

  18. Dosimetric study of thermoluminescent detectors in clinical photon beams using liquid water and PMMA phantoms

    Energy Technology Data Exchange (ETDEWEB)

    Matsushima, Luciana C., E-mail: lmatsushima@ipen.br [Gerencia de Metrologia das Radiacoes (GMR) - Instituto de Pesquisas Energeticas e Nucleares (IPEN-CNEN/SP), Av. Prof. Lineu Prestes, 2242, Cidade Universitaria, CEP: 05508-000, Sao Paulo, SP (Brazil); Veneziani, Glauco R. [Gerencia de Metrologia das Radiacoes (GMR) - Instituto de Pesquisas Energeticas e Nucleares (IPEN-CNEN/SP), Av. Prof. Lineu Prestes, 2242, Cidade Universitaria, CEP: 05508-000, Sao Paulo, SP (Brazil); Sakuraba, Roberto K. [Gerencia de Metrologia das Radiacoes (GMR) - Instituto de Pesquisas Energeticas e Nucleares (IPEN-CNEN/SP), Av. Prof. Lineu Prestes, 2242, Cidade Universitaria, CEP: 05508-000, Sao Paulo, SP (Brazil); Sociedade Beneficente Israelita Brasileira - Hospital Albert Einstein (HAE), Avenida Albert Einstein, 665, Morumbi, CEP: 05652-000, Sao Paulo, SP (Brazil); Cruz, Jose C. da [Sociedade Beneficente Israelita Brasileira - Hospital Albert Einstein (HAE), Avenida Albert Einstein, 665, Morumbi, CEP: 05652-000, Sao Paulo, SP (Brazil)

    2012-07-15

    The purpose of this study was the dosimetric evaluation of thermoluminescent detectors of calcium sulphate doped with dysprosium (CaSO{sub 4}:Dy) produced by IPEN compared to the TL response of lithium fluoride doped with magnesium and titanium (LiF:Mg,Ti) dosimeters and microdosimeters produced by Harshaw Chemical Company to clinical photon beams dosimetry (6 and 15 MV) using liquid water and PMMA phantoms. - Highlights: Black-Right-Pointing-Pointer Dosimetric study of thermoluminescent detectors of CaSO{sub 4}:Dy, LiF:Mg,Ti and {mu}LiF:Mg,Ti. Black-Right-Pointing-Pointer Clinical (6 and 15 MV) photon beams dosimetry using liquid water and PMMA phantom. Black-Right-Pointing-Pointer Linear behavior to the dose range (0.1 to 5 Gy). Black-Right-Pointing-Pointer TL response reproducibility better than {+-}4.34%. Black-Right-Pointing-Pointer CaSO{sub 4}:Dy represent a cheaper alternative to the TLD-100.

  19. Evaluation of entrance surface-skin doses in animals submitted on exams of abdomen in veterinary radiology using Tl dosimetry

    Energy Technology Data Exchange (ETDEWEB)

    Veneziani, G. R.; Matsushima, L. C.; Campos, L. L. [Instituto de Pesquisas Energeticas e Nucleares, Gerencia de Metrologia das Radiacoes / CNEN, Av. Lineu Prestes 2242, Cidade Universitaria, 05508-000 Sao Paulo (Brazil); Filho, A. M., E-mail: venezianigr@gmail.com [Centro Universitario de Rio Petro - UNIRP, Rodovia Br 153 (Transbrasiliana), Km. 69 Sao Jose do Rio Preto, Sao Paulo (Brazil)

    2014-08-15

    The radiation protection has recently gained considerable attention in human medicine. In veterinary medicine has been some advances in radiodiagnostic and therapy for domestic animal like dogs and cats. It is notable the increase of the costs with domestic animals that are considered, by many people in the whole world, like members of family. However, an important parameter that must be taken into account is the increasing use of computed tomography and other equipment s that uses ionizing radiation, which may lead to comparatively high exposure of critical organs. The radiation dose is determined by the balance between therapeutic benefit and possible damage to surrounding normal tissues. This study aimed the evaluation of entrance surface-skin doses in dogs submitted to radiodiagnostic procedures of abdomen using the technique of thermoluminescent dosimetry (TLD). The radiation doses were measured using thermoluminescent dosimeters of LiF:Mg,Ti (TLD 100) and a dog phantom made with a plastic container, proportional to the dog size, fulfilled with water. (Author)

  20. Determination of the conversion coefficient for ambient dose equivalent, H(10), from air kerma measurements; Determinacion del coeficiente de conversion para la dosis equivalente ambiental, H*(10), a partir de mediciones de kerma en aire

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez J, F. [UNAM, Facultad de Ciencias, Circuito Exterior, Ciudad Universitaria, 04510 Ciudad de Mexico (Mexico); Alvarez R, J. T., E-mail: trinidad.alvarez@inin.gob.mx [ININ, Departamento de Metrologia de Radiaciones Ionizantes, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2015-09-15

    Namely the operational magnitudes can be determined by the product of a conversion coefficient by exposure air kerma or fluence, etc. In particular in Mexico for the first time is determined the conversion coefficient (Cc) for operational magnitude Environmental Dose Equivalent H(10) by thermoluminescence dosimetry (TLD) technique. First 30 TLD-100 dosimeters are calibrated in terms of air kerma, then these dosimeters are irradiated inside a sphere ICRU type of PMMA and with the aid of theory cavity the absorbed dose in PMMA is determined at a depth of 10 mm within the sphere D{sub PMMA}(10), subsequently absorbed dose to ICRU tissue is corrected and the dose equivalent H(10) is determined. The Cc is determined as the ratio of H(10)/K{sub a} obtaining a value of 1.20 Sv Gy{sup -1} with a u{sub c}= 3.66%, this being consistent with the published value in ISO-4037-3 of 1.20 Sv Gy{sup -1} with a u{sub c}= 2%. (Author)