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Sample records for razvala yader legkikh

  1. Quasiparticles and Nuclear Vibrational States; Kvazichastitsy i vibratsionnye sostoyaniya yader

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    Sorensen, R. A. [Carnegie-Mellon University, Pittsburgh, PA (United States)

    1968-12-15

    The level structure associated with various nuclear vibrations is described. It is shown how these vibrations are described in terms of particle or quasi - particle excitations by means of the harmonic random phase approximation. Vibrations corresponding to different modes of excitation are compared. Motions corresponding to the enhancement of three different simple operators are considered: (a) the E2 one-body operator, (b) the operator causing the removal or addition of a like, zero-coupled pair of nucleons from the nucleus, and (c) the operator for allowed beta decay which changes one proton to a neutron or one neutron to a proton. (author) [Russian] Da etsja opisanie str u ktu ry urovnej, svjazannyh s razlichnymi jadernymi kolebanijami. Pokazano, kak takie vibracii mogut byt' opisany s pomoshh'ju chastichnyh i kvazichastichnyh vozbuzhdenij v garmonicheskom priblizhenii metoda sluchajnyhfaz. Sravnivajutsja kolebanija, sootvetstvujushhie razlichnym tipam vozbuzhdenij. R assm atrivaju tsja dvizhenija, sootvetstvujushhie uvelicheniju trehraz lichnyh prostyh operatorov: a) odnochastichnyj operator E2-perehoda, v) operator pogloshhenija ili porozhdenija sparennyh nuklonov s nulevym momentom, s) operator razreshennogo /3-raspada, zamenjajushhij proton na nejtron ili nejtron na proton. (author)

  2. Processing of light and heat-resistant alloys. Obrabotka legkikh i zharoprochnykh splavov

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    Belova, A F

    1976-01-01

    Results are given on the latest studies undertaken by Academician A.F. Belov. An examination is made of general problems in the processing (pressure, welding, thermal treatment, and others) of light and heat-resistant metals, problems in the technology and metal science studies of aluminum alloys, and problems of metallurgy and the processing of titanium and heat-resistant alloys. The publication is designed for researchers, designers, metallurgists, metal science specialists, machine building specialists, and students at corresponding institutions of higher learning.

  3. Osobennosti razvitiya sakharnogo diabeta u bol'nykh tuberkulezom legkikh v Respublike Dagestan

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    S A Abusuev

    2008-12-01

    Full Text Available Цель. Выявить клинико-эпидемиологические особенности развития СД и туберкулеза легких при сочетанной патологии: возраст начала болезни; половой состав; соотношение городских и сельских жителей; распределение СД по степени тяжести; распределение туберкулеза по клиническим формам, бактериовыделению. Материалы и методы. Материалами исследования явились данные компьютерного полицевого регистра Республиканского противотуберкулезного диспансера на 11 702 вновь выявленных больных за 1999?2005 гг. и 143 истории болезни и амбулаторные карты больных Республиканского противотуберкулезного диспансера, туберкулезных больниц городов Буйнакска, Избербаша, Каспийска и Республиканского эндокринологического центра с сочетанием сахарного диабета и туберкулеза легких. Эти больные находились на учете в 2001?2006 гг. Для сравнения были использованы ранее опубликованные материалы по СД в Дагестане. Результаты. Из 143 больных СД и туберкулезом СД1 болели 18,88% (27 чел., СД 2 ? 81,12% (116 чел.. Среди больных СД2 в молодом возрасте заболели 25,00% (29 чел., в зрелом ? 52,59% (61 чел., в пожилом ? 21,55% (25 чел., в старческом ? 0,86% (1 чел.. Инфильтративный туберкулез был у 70,63% (101 чел., фиброзно-кавернозный ? у 11,19% (16 чел., очаговый ? у 5,60% (8 чел., диссеминированный ? у 4,19% (6 чел., туберкулома ? у 4,19% (6 чел., казеозная пневмония ? у 2,10% (3 чел., цирротический туберкулез ? у 1,40% (2 чел., туберкулезный плеврит ? у 0,70% (1 чел.. Выводы. Сочетание СД и туберкулеза характеризуется следующим: частое начало СД1 наблюдается в юношеском возрасте, СД2 ? в зрелом возрасте; наиболее частое начало туберкулеза у больных сахарным диабетом отмечается в зрелом и пожилом возрасте, в то время как среди всех вновь выявленных больных туберкулезом преобладают лица юношеского и молодого возраста; среди больных СД1 и туберкулезом преобладают мужчины, а среди больных СД2 и туберкулезом ? женщины; сочетанной патологией чаще страдают городские жители, причем как мужчины, так и женщины.

  4. Method of obtaining concentrated preparations of Cl{sup 36} and Br{sup 82} by recoil nuclei under exposure to high-density neutron fields; Preparation de composes du chlore-36 et du brome-82 de haute activite specifique, par exposition de noyaux de recul a des champs neutroniques intenses; Poluchenie kontsentrirovannykh preparatov Cl{sup 36} i Br{sup 82} metodom yader otdachi pri obluchenii v nejtronnykh polyakh vysokoj plotnosti; Obtencion de compuestos de cloro-36 y de bromo-82 de alta actividad especifica por retroceso de nucleos en campos neutronicos intensos

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    Kurchatova, L N; Kurchatov, B V

    1962-01-15

    resultado de la superposicion de toda una serie de procesos : formacion de atomos de cloro radiactivo, separacion radiolitica del haluro, difusion de los productos obtenidos en la red cristalina del carbono, su sorcion en la superficie y su recombinacion en distintos centros. La extraordinaria variedad de condiciones en que se forman e interaccionan los productos de irradiacion con el esqueleto carbonico y su superficie depende de un gran numero de factores, a saber : la estructura ultramicroscopica, la naturaleza de los nuevos compuestos, que estan relacionados con el tipo de compuestos superficiales, la existencia en la superficie del carbono de centros con un espectro continuo de energia de sorcion, la probable formacion de diversos centros estacionarios de recombinacion por irradiacion del carbono, etc. Por ello, las tecnicas utilizadas ofrecen la posibilidad de realizar una gran variedad de experimentos a fin de establecer las condiciones optimas de enriquecimiento. (author) [Russian] Klassicheskij metod polucheniya kontsentrirovannykh radioaktivnykh preparatov Stsilarda-CHalmersa obychno rassmatrivaetsya kak malo ehffektivnyj pri ispol'zovanii bol'shikh integral'nykh potokov nejtronov iz-za znachitel'nogo razlozheniya obluchaemogo soedineniya pod dejstviem radiatsii. Avtorami najdeny soedineniya broma i khlora s uglerodom, pozvolyayushchie poluchat' sushchestvennoe obogashchenie radioaktivnymi izotopami khlora i broma metodom yader otdachi pri obluchenii v nejtronnykh potokakh poryadka 10{sup 13} nejtr./sek-cm{sup 2}. EHti soedineniya otvechayut formule C{sub n}X, gde X-Cl ili Br, N = 10 + 20 dlya soedineniya khlora i 25 + 70 -dlya soedinenij broma. Oni dostatochno ustojchivy termicheski i khimicheski. Soedinenie sostava C{sub 30}Br vyderzhivaet nagrevanie do 300{sup o}C v atmosfere argona bez otshchepleniya broma; ono razlagaetsya polnost'yu pri temperature 600{sup o}C. Ukazannoe soedinenie broma s uglerodom prakticheski ustojchivo k vozdejstviyu vodnykh rastvorov

  5. Decay schemes of the radioactive nuclei A = 225 to 229. Skhemy raspada radioaktivnykh yader A = 225 - 229

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    Dzhelepov, B S; Ivanov, R B; Mikhailova, M A

    1976-01-01

    This monograph is devoted to properties of atomic nuclei with mass numbers A = 225 to 229. The book collects and systematizes all of the experimental data characterizing properties of radioactive isotopes: information concerning masses of nuclei, magnetic and electric moments, lifetimes of nuclear states, the most reliable information on characteristics of radiations, quantum characteristics of levels and other properties of the studied nuclei. On basis of a critical analysis of the totality of information, decay schemes of radioactive nuclei with mass numbers A = 225 to 229 were constructed, as well as the series of excited states of the isotopes which lie in this region of nuclei.

  6. Modern X-ray examination methods in differential diagnostics of various forms of lung hydatid disease; Sovremennye luchevye metody issledovanij v differentsial'noj diagnostike razlichnykh form ehkhinokokkoza legkikh

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    Akilova, D N [1-Tashkent state med. inst., Tashkent (Uzbekistan)

    2003-02-15

    This work analyzes possibilities of complex radiation diagnostics using traditional Xray, computer and magnet resonance tomography and ultrasonography based on examination and treatment of 223 patients with lung hydatid disease. The diagnosis of 187 out 223 patients has been confirmed during operations. Original methods of ultrasound' examination (USI) of lungs have been developed. The role and place of needle aspirated biopsy controlled by computer tomography in differential diagnostics of complicated forms of lung hydatid disease with various forms of tumors, tubercular caverns etc. have been identified. Self-descriptiveness, sensitivity and general accuracy of these examination methods have been studied on patients with non-complicated and complicated forms of lung hydatid disease. Self descriptiveness of X-ray for non-complicated forms was 104%, USI - 85%, CT 100%, for complicated forms self-descriptiveness of X-ray was 92%, CT- 97%. Ultrasound examination of chest allowed visualizing and localizing of hydatid cysts when they were peripheral. The research enabled to develop algorithm of diagnosing non-complicated and complicated forms of lung hydatid disease. Needle aspirated biopsy was applied in complicated cases. In non-complicated cases transcutaneous manipulations have not been performed to avoid the process dissemination. (author)

  7. Interactions of {sub 82}Pb{sup 208} nuclei with energy 158 GeV per nucleon with photoemulsion nuclei; Vzaimodejstviya yader {sub 82}Pb{sup 208} s ehnergiej 158 Gev na nuklon s yadrami fotoehmul'sii

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    Adamovich, M I; Andreeva, N P; Bubnov, V I; Gajtinov, A Sh; Kanygina, Eh K; Musaeva, A K; Sejtimbetov, A M; Skorobagatova, V I; Filippova, L N; Chasnikov, I Ya [Fiziko-tekhnicheskij Inst. Ministerstava Nauki i Vysscego Obrazovaniya Respubliki Kazakhstan, Almaty (Kazakhstan)

    1999-07-01

    In this report there are experimental data on {sub 82}Pb{sup 208} nuclei (158 GeV) interaction with photoemulsion nuclei. The said data are compared to the similar ones for {sub 79}Au{sup 197} nuclei with less energy (10,7 A GeV). Stack of nuclear emulsion was irradiated with the beam of nuclei {sub 82}Pb{sup 208} at SPS of CERN. Events search was done along the primary nucleus trace. Pb nucleus average path length happened to be {lambda}=(3,8{+-}0,1) cm, this virtually coincides with the one calculated by Brandt and Peters formula (3,9 cm). Secondary particles were identified into s (storm), g (knock-on protons) and b- particles (target nucleus fragments), as well as into nucleus-bullet fragments with different charges (Z=1,2,{>=}3). This allowed obtaining event distribution by multiplicity of these particles (n{sub s}, n{sub g}, n{sub b}) and fragments (n{sub z=1,2,{>=}}{sub 3}), calculation of average values by multiplicity (see table), finding correlation of characteristics. >From the table it's clear that when the energy increases increases 2,5 times where as insignificantly decreases and doesn't change.

  8. Anomalous component of absorption function of relativistic fragments produced in interactions of magnesium nuclei with plexiglas at 4. 5A GeV/c momentum. Anomal'naya komponenta funktsii pogloshcheniya relyativistskikh fragmentov, obrazovannykh vo vzaimodejstviyakh yader magniya c pleksiglasom pri impul'se 4. 5A GeV/c

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    Karev, A G; Morozov, B A; Petukhov, Yu P; Povtorejko, A A; Sukhanov, A Yu [Joint Inst. for Nuclear Research, Dubna (USSR)

    1989-01-01

    Analysis of the Cherenkov spectrometer results on the fragmentation of the magnesium nuclei with momenta 4.5A GeV/c interacting with plexiglas show the presence of a short-range component in the fragment absorption function. For fragments with Z=6-10 (Z is the charge) the mean free paths in plexiglas for normal and anomalous component are estimated to be {lambda}{sub n}=141.7 {plus minus} 1.9 mm and {lambda}{sub a}=1.9 {plus minus} 0.8 mm. The anomalous component admixture at fixed {lambda}{sub a}=2 mm is {alpha}=0.084 {plus minus} 0.027. The parameter estimates are stable for various criteria applied to selecting the events.

  9. Distribution and removal of transuranic elements and cerium deposited by the inhalation route; Distribution et elimination des transuraniens et du cerium deposes par l'intermediaire des voies respiratoires; Raspredelenie transuranovykh ehlementov i tseriya, otkladyvayushchikhsya v rezul'tate vdykhaniya i ikh udalenie; Distribucion y eliminacion de elementos transuranicos y de cerio depositados por inhalacion

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    Bair, W. J.; Tombropoulos, E. G.; Park, J. F. [Hanford Atomic Products Operation, General Electric Company, Richland, WA (United States)

    1963-02-15

    , parasimpatominmeticos, parasiinpatoliticos y antihistamfnicos. El agente de quelacion, acido dietilentriaminopentaacetico.administ'rado en forma de aerosol o por via intraperitoneal elimina rapidamente el {sup 144}Ce-{sup 144}Pr de los pulmones y del organismo por excrecion urinaria. Un mes despues de ser expuestos a la accion del {sup 144}CeO{sub 2}, las ratas y perros tratados retienen una cantidad de {sup 144}Ce-{sup 144}Pr inferior al 10% de la retenida por los animales no tratados. (author) [Russian] Raspredelenie v tkanyakh i vydelenie vdykhaemykh radioaktivnykh izotopov menyaetsya vmeste s khimicheskoj formoj i razmerom chastits aehrozolej. U sobak cherez tridtsat' dnej posle vdykhaniya 70% nitrata plutoniya bylo obnaruzheno v legkikh, 10% - v, pecheni i 15% - v kostyakh skeleta. Posle vdykhaniya aehrozolya P{sup 239} O{sub 2} s vyschityvaemym srednim diametrom chastits (VSD), ravnym 0,12 mikron, 71% ehtogo veshchestva v organizme bylo skontsentrirovano v legkikh, 3% - v bronkhial'nykh limfaticheskikh uzlakh, 4,4% - v myshtsakh, 1,3% - v kostyakh skeleta i 20% bylo ravnomerno raspredeleno v ostal'nykh tkanyakh. Posle vdykhaniya aehrozolya P{sup 239} O{sub 2} s VSD chastits v intervale 0,3 - 0,6 mikron v legkikh soderzhalos' 98% veshchestva, v bronkhial'nykh limfaticheskikh uzlakh - okolo 1% i v ostal'nykh tkanyakh - 1%. Ehti dannye i issledovaniya mochi i isprazhnenij ukazyvayut na otnositel'nuyu vazhnost' trekh putej, po kotorym vdykhaemye radioaktivnye izotopy vyvodilis' iz legkikh, a imenno cherez trakheyu v rezul'tate dvizheniya resnichen s posledueshchem vydeleniem s isprazhneniyami, cherez al'veolyarnuyu membranu i pereraspredelenie v drugikh lgkanyakh s postepennym vydeleniem s mochoj i, nakonets, putem peremeshcheniya v bronkhial'nye limfaticheskie uzly, kotorye nakoplyayut vdykhaemye nerastvorimye veshchestva. Byli oprobovany terapevticheskie sredstva, kotorye, kak mozhno bylo ozhidat', povyshayut ochishchenie legkikh ot radioaktivnykh izotopov takimi putyami, pri

  10. Measurement of resonance parameters of cross-sections affecting fast-neutron propagation in various media; Mesure des parametres de resonance de sections efficaces lies a la propagation des neutrons dans differents milieux; Izmerenie parametrov rezonansnoj struktury sechenij, vliyayushchikh na rasprostranenie bystrykh nejtronov v sredakh; Medicion de los parametros de resonancia de las secciones eficaces que afectan a la propagacion de los neutrones rapidos en distintos medios

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    Nikolaev, M N; Filippov, V V; Bondarenko, I I [Academy of Sciences, Moscow, Union of Soviet Socialist Republics (Russian Federation)

    1962-03-15

    , prostiraetsya vplot' do neskol'kikh desyatkov kehv dlya tyazhelykh yader i do neskol'kikh Mehv dlya yader srednego vesa. Dlya ucheta rezonansnykh ehffektov pri vychislenii gruppovykh parametrov neobkhodimo znat' ne tol'ko srednie secheniya vzaimodejstviya nejtronov s veshchestvami, no i takie velichiny, kak (1/{Sigma}{sub t}), (1/{Sigma}{sub t}{sup 2}) i drugie - skobki oznachayut usrednenie po ehnergeticheskoj gruppe. Imeyushchiesya v nastoyashchee vremya svedeniya o rezonansnykh parametrakh v oblasti bystrykh nejtronov nedostatochny dlya togo, chtoby ukazannye velichiny mogli byt' vychisleny s neobkhodimoj tochnost'yu. V svyazi s ehtim predstavlyaet interes neposredstvenno e izmerenie velichin (1/{Sigma}{sub t}), (1/{Sigma}{sub t}{sup 2}) i drugikh analogichnykh kharakteristik. V doklade privodyatsya rezul'taty izmerenij ryada parametrov takikh kak ({Sigma}{sub t}), ({Sigma}{sub t}{sup 2}), (1/{Sigma}{sub t}), (1/{Sigma}{sub t}{sup 2}), (1/{Sigma}{sub t}{sup 3}) i drugie, kharakterizuyushchi kh strukturu sechenij ryada yader srednego vesa v oblasti ot 300 kehv do 3 Mehv. Ukazannye velichiny byli polucheny putem analiza krivykh propuskaniya, snyatykh v khoroshej geometrii vplot' do propuskanij {approx}10{sup -2}. Poluchennye dannye ukazyvayut na sil'noe vliyanie rezonansnykh ehffektov na diffuzionnye kharakteristiki veshchestva. (author)

  11. Resonance absorption of nuclear gamma radiation; Absorption par resonance des rayons gamma; Rezonansnaya absorbtsiya i rasseyanie yadernogo gamma-izlucheniya; Absorcion por resonancia de las radiaciones gamma en los nucleos

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    Hanna, S S; Perlow, G J [Argonne National Laboratory, Argonne, IL (United States)

    1962-01-15

    radiacion do resonancia con y sin polarizacion. Estos estudios les han conducido a una interpretacion de la estructura hiperfina en funcion de las propiedades de los estados nucleares y de la interaccion hiperfina en el hierro. Tambien han investigado los efectos de un campo magnetico externo sobre la estructura hiperfina. Por otra parte, la absorcion por resonancia en el {sup 57}Fe permitio estudiar la relacion entre la cronologia de la desintegracion de im estado nuclear y el espectro de la radiacion observada. Se realizaron observaciones detalladas sobre el espectro de las radiaciones de resonancia filtradas, en funcion del tiempo, en condiciones muy diversas. (author) [Russian] Kak pokazal Messbauehr, ispuskanie i pogloshchenie yadernogo izlucheniya bez otdachi yadra obespechivaet prostoj metod izucheniya vzaimodejstviya yader s ehlektromagnitnym izlucheniem i, chto ochen' vazhno, yavlyaetsya chrezvychajno chuvstvitel'nym sredstvom issledovaniya bol'shogo kolichestva fizicheskikh zadach. V sluchae yader zheleza-57 sozdaetsya ves'ma blagopriyatnoe polozhenie, tak kak v ehtom sluchae rezonansnoe pogloshchenie mozhet ispol'zovat'sya v kachestve ochen' chuvstvitel'nogo detektora izmeneniya chastoty ehlektromagnitnogo izlucheniya. Detal'no izuchalos' rezonansnoe pogloshchenie v zheleze-57. Intensivnost' pogloshcheniya, forma i liniya sdviga nablyudalis' v zavisimosti ot temperatury. Polyarizatsiya radioaktivnogo izlucheniya nablyudalas' posredstvom ehksperimentov s namagnichennymi istochnikami i poglotitelyami. Sverkhtonkij spektr rezonansnoj radiatsii analizirovalsya s polyarizatsiej i bez nee. EHti issledovaniya priveli k tolkovaniyu sverkhtonkoj struktury v otnoshenii svojstv yadernykh sostoyanij i sverkhtonkogo vzaimodejstviya v zheleze. Bylo rassmotreno takzhe vliyanie vneshnego magnitnogo polya na sverkhtonkuyu strukturu. Rezonansnoe pogloshchenie v zheleze-57 bylo ispol'zovano dlya izucheniya svyazi mezhdu razvitiem raspada yadernogo sostoyaniya vo vremeni i spektrom

  12. Cobalt-60 and Caesium-137 Gamma Sources; Sources de rayonnement gamma au cobalt-60 et au cesium-137; Gamma-istochniki iz kobal'ta-605 i tseziya-137; Fuentes gamma de cobalto-60 y de cesio-137

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    Kulish, E E; Fradkin, G M [Academy of Sciences of the USSR, Moscow, Union of Soviet Socialits Republics (Russian Federation)

    1960-07-15

    cobalto-60 y cesio-137 producidas en la Union Sovietica y se examinan algunos problemas de orden tecnologico planteados por su fabricacion. En el informe figuran una serie de datos sobre las propiedades de las radiaciones emitidas por las fuentes de {sup 60}Co y {sup 137}Cs y del material con que estas se fabrican. Se facilitan informaciones sobre la influencia que la magnitud del flujo neutronico y las caracteristicas geometricas de la muestra ejercen sobre la actividad de la fuente; el informe tambien contiene datos sobre el rendimiento de los distintos isotopos de cesio obtenidos por fision de los nucleos de uranio. Se examinan los procedimientos para encerrar hermeticament e las fuentes y se facilita una lista completa de las fuentes utilizadas en la Union Sovietica, con indicacion de sus caracteristicas geometricas y de su actividad. Por ultimo, se hace un estudio comparativo de las fuentes de {sup 60}Co y {sup 137}Cs. (author) [Russian] V doklade privodyatsya osnovnye tekhnicheskie kharakteristiki vypuska- emykh v SSSR gamma-istochnikov na osnove kobal'ta-60 i tseziya-137, a takzhe rassmatrivayutsya nekotorye voprosy tekhnologii ikh proizvodstva. Doklad soderzhit svedeniya o sostave izlucheniya izotopov Co{sup 60} i Cs{sup 137} i syr'ya, iz kotorogo oni izgotavlivayutsya . Privodyatsya dannye o zavisimosti aktivnosti kobal'tovykh istochnikov ot velichiny potoka nejtronov i geometricheskikh razmerov obraztsa, a takzhe dannye o velichine vykhoda izotopov tseziya pri delenii yader urana. Dalee rassmatrivaetsya vopros o germetizatsii istochnikov i privoditsya polnaya nomenklatura vypuskaemykh v SSSR istochnikov s ukazaniem ikh geometricheskikh razmerov i velichiny aktivnosti. V kontse provoditsya nekotoroe sravnenie istochnikov Co{sup 60} i Cs{sup 137}. (author)

  13. Experimental studies of some of the physical features of beryllium-moderated intermediate reactors; Etude experimentale de quelques particularites physiques des reacteurs a neutrons intermediaires, ralentis au beryllium; Ehksperimental'ny e issledovaniya nekotorykh fizicheskikh osobennostej promezhutochnykh reaktorov s berillievym zamedlitelem; Estudios experimentales de algunas caracteristicas fisicas de los reactores intermedios moderados con berilio

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    Lejpunskij, A I; Kuznetsov, V A; Artyukhov, G Ya; Mogil' ner, A I; Prokhorov, Yu A; Steklovski, V M; Chernov, L A [Akademiya Nauk, Moskva, Union of Soviet Socialist Republics (Russian Federation)

    1962-03-15

    la evaluacion de la eficacia de los cilindros compensadores giratorios distribuidos en el limite entre el cuerpo y el reflector. (author) [Russian] Doklad posvyashchen obzoru nekotorykh ehksperimen-tal'nykh rezul'tatov, poluchennykh na stende PF-4, prednaznachennom dlya detal'nogo issledovaniya fizicheskikh osobennostej reaktorov, rabotayushchikh na nejtronakh promezhutochnykh ehnergij. Aktivnye zony i otrazhateli razlichnykh kriticheskikh sborok predstavlyali soboj plotnuyu upakovku stal'nykh ili alyuminievykh trub, v kotorykh pomeshchalis' diski iz razlichnykh materialov. Kombinatsiya diskov urana (90%-nogo obogashcheniya) i zamedlyayushchikh materialov v razlichnoj proportsii, a takzhe vvedenie v otrazhatel' zamedlyayushchikh sloev razlichnoj tolshchiny, pozvolilo menyat' spektr nejtronov, proizvodyashchikh delenie, v ochen' shirokikh predelakh. V doklade privedeno opisanie stenda i ego otdel'nykh uzlov. Analiziruetsya sravnitel'naya ehffektivnost' vnutrennego i vneshnego zamedleniya dlya reaktorov s ochen'malym otnosheniem yader zamedlitelya i urana v aktivnoj zone. Ehksperimenty pokazyvayut, chto dazhe v sluchae tolstykh zamedlyayushchikh otrazhatelej maloe razbavlenie urana zamedlitelem (otnoshenie yader berilliya i urana-235 {partial_derivative}Be/{partial_derivative}U{sup 235}{approx_equal}1) privodit k vozrastaniyu kriticheskoj massy. Znachitel'noe mesto v doklade udeleno analizu geterogennykh ehffektov v promezhutochnykh reaktorakh. Pokazano, chto dlya reaktora s {partial_derivative}Be/{partial_derivative}U{sup 235}= 30+40, vysokoobogashchenny j uran v razlichnykh tolshchinakh ot 0,023 g/sm{sup 2} do 32 g/sm{sup 2} okazyvaet odinakovoe vliyanie na reaktiv-nost' sistemy. Analiziruyutsya prichiny, privodyashchie k kompensatsii ehffekta ehkranirovki nejtronnogo potoka tolstymi sloyami urana. V doklade privoditsya interesnyj fakt vozrastaniya ehffektivnosti urana vblizi po- gloshchayushchikh sterzhnej, ehksperimental'n o obnaruzhennyj v sbor kes {partial

  14. Investigations of the chemical states of carrier-free phosphorus-32 as extracted into water from pile-irradiated sulphur; Recherches sur les etats chimiques du phosphore-32 sans entraineur obtenu par extraction aqueuse a partir de soufre irradie dans un reacteur; Issledovanie khimicheskogo sostoyaniya svobodnogo ot nositelya fosfora-32 pri izvlechenii ego v vodu iz obluchennoj v yadernom reaktore sery; Estudio de los estados quimicos del fosforo-32 libre de portador que se obtiene por extraccion acuosa del azufre irradiado en un reactor

    Energy Technology Data Exchange (ETDEWEB)

    Dahl, J B; Birkelund, O R [Institutt for Atomenergi, Kjeller, Lillestrom (Norway)

    1962-01-15

    {>=} 5). Aucun metaphosphate (cyclique) n'a ete decele dans la solution lors de la production et du stockage. Les resultats indiquent que les composes de polyphosphore ont ete formes dans le materiau de cible au cours de l'irradiation. On a etudie plus particulierement l'adsorption des composes du phosphore-32 sans entraineur par le verre dans les conditions de l'experience. (author) [Spanish] Uno de los metodos que se emplean para obtener fosforo-32 libre de portador consiste en irradiar azufre en un reactor y extraer con agua el fosforo formado. La presente memoria informa sobre los estados quimicos del fosforo-32 en soluciones acuosas durante las diversas fases del proceso normal de obtencion. Los autores han estudiado tambien las modificaciones que el estado quimico de los compuestos de fosforo-32 experimenta en el producto final, en funcion del tiempo de almacenamiento. Han encontrado que el fosforo-32 aparece principalmente en forma de orto-fosfato. La proporcion de ortofosfato aumenta durante el tratamiento quimico; al comenzar la extraccion, es del orden del 70 por ciento, en tanto que alrededor del 98 por ciento del fosforo-32 libre de portador obtenido como producto final se encuentra bajo forma de ortofosfato. Los componentes restantes de la mezcla consisten en piro-, tri-, tetra- y polifosfatos de cadena larga (con un numero de atomos de fosforo {>=} 5). Durante la elaboracion y almacenamiento los autores no han encontrado metafosfatos (ciclicos) en ninguna de las soluciones. Los resultados obtenidos indican que los compuestos polifosforicos se formaron en el material del blanco durante la irradiacion. Los autores han prestado especial atencion al estudio de la adsorcion de compuestos de fosforo-32 libre de portador por el material de vidrio en las condiciones experimentales. (author) [Russian] Odnim iz sovremennykh metodov polucheniya svobodnogo ot nositelya fosfora-32 yavlyaetsya izvlechenie ego v vodu iz obluchennoj v yader- nom reaktore sery. V

  15. Transmutation doping and recoil effects in semiconductors exposed to thermal neutrons; Transmutations provoquees et effets de recul dans les semi-conducteurs exposes aux neutrons thermiques; Prisadka i sdacha v rezul'tate prevrashcheniya poluprovodnikov pod dejstviem teplovykh nejtronov; Impurificacion por transmutacion y efectos de retroceso en los semiconductores expuestos a neutrones termicos

    Energy Technology Data Exchange (ETDEWEB)

    Crawford, Jr, J H; Cleland, J W [Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN (United States)

    1962-01-15

    ,2, 39 chasov. Poehtomu okolo 3 aktseptorov (Ca{sup 71}) vvodyatsya na kazhdyj donor (As{sup 75} i Se{sup 77}), i putem vybora prodolzhitel'nosti oblucheniya mozhno sokratit' kontsentratsiyu ehlektronov Se tipa ''n'' do ves'ma malykh znachenij ili prevratit' Se tipa ''n'' v tip ''p''. Period poluraspada, vedushchij k obrazovaniyu Ga71, dostatochno prodolzhitelen, tak chto podrobnaya ''radioaktivnaya titratsiya'' mozhet soprovozhdat'sya opredeleniem koehffitsienta KHolla i ehlektroprovodnosti. Opyty pokazyvayut takzhe, chto priblizitel'no odin ehlektron na kazhdyj zakhvat nejtrona udalyaetsya defektom reshetki, sozdannym otdachej yadra pri zakhvate ispuskaemykh gamma-luchej. EHti vytesnennye atomy mogut byt' vozvrashcheny obratno na svoe mesto v normal'noj reshetke putem otzhiga pri 450 Degree-Sign C. Byli proizvedeny takzhe nablyudeniya nad dejstviem otdachi v kremnie, prichem bylo ustanovleno, chto na kazhdyj zakhvat ustranyaetsya priblizitel'no 2 nositelya zaryada. Posledstviya ehtikh rezul'tatov, a takzhe rezul'taty v otnoshenii germaniya obsuzhdayutsya v funktsii ot zakhvata spektra gamma-luchej. V sur'myanistom indii zakhvat gamma-luchej iz In{sup 115} nedostatochen dlya togo, chtoby vytesnit' bol'shoe chislo yader, tak chto glavnym vozdejstviem yavlyaetsya obrazovanie Sn{sup 116}, kotoryj stanovitsya donorom pri zamene mesta v reshetke indiya. YAdernaya prisadka predstavlyaetsya perspektivnoj dlya izucheniya mnogochislennykh slozhnykh poluprovodnikov, vvedenie v kotorye primesej khimicheskim sposobom predstavlyaetsya zatrudnitel'nym. (author)