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Post-Irradiation Behaviour of I{sup 131} in TeO{sub 2}; Comportement de {sup 131}I Dans TeO{sub 2} Apres Irradiation; 041f 041e 0412 0415 0414 0415 041d 0418 0415 0419 041e 0414 0410 -131 0412 TeO{sub 2} 0433 041f 041e 0421 041b 0415 041e 0411 041b 0423 0427 0415 041d 0418 042f ; Comportamiento del {sup 131}I en TeO{sub 2} Despues de su Irradiacion

Conference:

Abstract

The system I{sup 131} in TeO{sub 2} is interesting because little is known about thermal chemical changes in this target. Radioiodine was produced by neutron irradiation of TeO{sub 2} in the reactor. Irradiated TeO{sub 2} was dissolved in diluted NaOH. The analysis of the iodine valency forms was made by ion exchange techniques. The thermal and radiation stability of TeO{sub 2} was studied by using the spectrophotometric method for the determination of tellurium. Post-irradiation annealing of I{sup 131} in TeO{sub 2} was studied in dependence on the time and temperature of the heating. The main tendency of annealing was the reduction of radioiodine. The time dependence of this process indicates a fast change at high temperatures. The curves are more complex at lower temperatures. The annealing may appear complex because of the variety of thermal reactions of iodine intermediary. It may react with products of the following processes: tellurium recoil and corresponding hot zone, beta transition of Te{sup 131} and TeO{sub 2} itself. The kinetics of these changes was considered and an estimation of the processes during annealing was made. The influence of the neutron flux on the kinetics of annealing was also studied. (author) [French] Le cas de 131I  More>>
Authors:
Jacimovic, Lj.; Stevovic, J.; Veljkovic, S. R. [1] 
  1. Boris Kidric Institute of Nuclear Sciences, Belgrade, Yugoslavia (Serbia)
Publication Date:
Apr 15, 1965
Product Type:
Conference
Report Number:
IAEA-SM-57/44
Resource Relation:
Conference: Symposium on Chemical Effects Associated with Nuclear Reactions and Radioactive Transformations, Heidelberg (Germany), 7-11 Dec 1964; Other Information: 16 refs., 6 figs., 3 tabs.; Related Information: In: Chemical Effects of Nuclear Transformations. Vol. II. Proceedings of the Symposium on Chemical Effects Associated with Nuclear Reactions and Radioactive Transformations| 572 p.
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY AND NUCLEAR CHEMISTRY; ANNEALING; CHEMICAL RADIATION EFFECTS; HEATING; IODINE 131; IRRADIATION; NEUTRON FLUX; NEUTRON REACTIONS; REACTION KINETICS; RECOILS; SODIUM HYDROXIDES; SPECTROPHOTOMETRY; STABILITY; TELLURIUM 131; TELLURIUM OXIDES; TIME DEPENDENCE
OSTI ID:
22184040
Research Organizations:
International Atomic Energy Agency, Vienna (Austria); Joint Commission on Applied Radioactivity of the International Council of Scientific Unions, Paris (France)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA13M3350008575
Submitting Site:
INIS
Size:
page(s) 523-533
Announcement Date:
Jan 30, 2014

Conference:

Citation Formats

Jacimovic, Lj., Stevovic, J., and Veljkovic, S. R. Post-Irradiation Behaviour of I{sup 131} in TeO{sub 2}; Comportement de {sup 131}I Dans TeO{sub 2} Apres Irradiation; 041f 041e 0412 0415 0414 0415 041d 0418 0415 0419 041e 0414 0410 -131 0412 TeO{sub 2} 0433 041f 041e 0421 041b 0415 041e 0411 041b 0423 0427 0415 041d 0418 042f ; Comportamiento del {sup 131}I en TeO{sub 2} Despues de su Irradiacion. IAEA: N. p., 1965. Web.
Jacimovic, Lj., Stevovic, J., & Veljkovic, S. R. Post-Irradiation Behaviour of I{sup 131} in TeO{sub 2}; Comportement de {sup 131}I Dans TeO{sub 2} Apres Irradiation; 041f 041e 0412 0415 0414 0415 041d 0418 0415 0419 041e 0414 0410 -131 0412 TeO{sub 2} 0433 041f 041e 0421 041b 0415 041e 0411 041b 0423 0427 0415 041d 0418 042f ; Comportamiento del {sup 131}I en TeO{sub 2} Despues de su Irradiacion. IAEA.
Jacimovic, Lj., Stevovic, J., and Veljkovic, S. R. 1965. "Post-Irradiation Behaviour of I{sup 131} in TeO{sub 2}; Comportement de {sup 131}I Dans TeO{sub 2} Apres Irradiation; 041f 041e 0412 0415 0414 0415 041d 0418 0415 0419 041e 0414 0410 -131 0412 TeO{sub 2} 0433 041f 041e 0421 041b 0415 041e 0411 041b 0423 0427 0415 041d 0418 042f ; Comportamiento del {sup 131}I en TeO{sub 2} Despues de su Irradiacion." IAEA.
@misc{etde_22184040,
title = {Post-Irradiation Behaviour of I{sup 131} in TeO{sub 2}; Comportement de {sup 131}I Dans TeO{sub 2} Apres Irradiation; 041f 041e 0412 0415 0414 0415 041d 0418 0415 0419 041e 0414 0410 -131 0412 TeO{sub 2} 0433 041f 041e 0421 041b 0415 041e 0411 041b 0423 0427 0415 041d 0418 042f ; Comportamiento del {sup 131}I en TeO{sub 2} Despues de su Irradiacion}
author = {Jacimovic, Lj., Stevovic, J., and Veljkovic, S. R.}
abstractNote = {The system I{sup 131} in TeO{sub 2} is interesting because little is known about thermal chemical changes in this target. Radioiodine was produced by neutron irradiation of TeO{sub 2} in the reactor. Irradiated TeO{sub 2} was dissolved in diluted NaOH. The analysis of the iodine valency forms was made by ion exchange techniques. The thermal and radiation stability of TeO{sub 2} was studied by using the spectrophotometric method for the determination of tellurium. Post-irradiation annealing of I{sup 131} in TeO{sub 2} was studied in dependence on the time and temperature of the heating. The main tendency of annealing was the reduction of radioiodine. The time dependence of this process indicates a fast change at high temperatures. The curves are more complex at lower temperatures. The annealing may appear complex because of the variety of thermal reactions of iodine intermediary. It may react with products of the following processes: tellurium recoil and corresponding hot zone, beta transition of Te{sup 131} and TeO{sub 2} itself. The kinetics of these changes was considered and an estimation of the processes during annealing was made. The influence of the neutron flux on the kinetics of annealing was also studied. (author) [French] Le cas de 131I dans TeO{sub 2} presente un interet en raison du peu de connaissances dont on dispose sur les modifications chimico-thermiques dans cette cible. Les auteurs ont obtenu le radioiode par exposition de TeO{sub 2} aux neutrons en pile, puis dissous TeO{sub 2} irradie dans NaOH dilue. Ils ont fait l'analyse des divers etats de valence de l'iode par des procedes d'echange d'ions. Ils ont etudie la stabilite thermique et la radiostabilite de TeO{sub 2} en recourant a la methode spectrophotometrique pour la determination du tellure. Ils ont etudie le recuit de 131I dans TeO{sub 2} apres irradiation en fonction du temps et de la temperature de chauffage. La tendance du recuit a ete surtout une tendance a la reduction du radioiode. Ce processus est fonction du temps; une variation rapide se produit a haute temperature. Les courbes sont plus complexes a basse temperature. Le recuit peut sembler complexe en raison de la variete des reactions thermiques de l'iode intermediaire qui peut reagir avec les produits des processus suivants: recul du tellure et zone chaude correspondante, transition beta de {sup 131}Te et TeO{sub 2} lui-meme. Les auteurs ont etudie la cinetique de ces variations et procede a une evaluation des processus au cours du recuit. Ils ont egalement etudie l'influence du flux de neutrons sur la cinetique du recuit. (author) [Spanish] El estudio del sistema {sup 131}I en TeO{sub 2} presenta interes porque los cambios termoquimicos que este blanco experimenta se conocen imperfectamente. El radioyodo se obtuvo por irradiacion neutronica del TeO{sub 2} en un reactor. El TeO{sub 2} irradiado se disolvio en NaOH diluido. Para el analisis de los estados de valencia del yodo, se recurrio a tecnicas de intercambio ionico. La estabilidad termica y frente a las radiaciones del TeO{sub 2} se estudio con ayuda del metodo espectro- fotometrico para la determinacion del teluro. El recocido del {sup 131}I en TeO{sub 2} consecutivo a la irradiacion se estudio en funcion del tiempo y de la temperatura de calentamiento. El principal efecto del recocido es la reduccion del radioyodo. La variacion de este proceso en funcion del tiempo pone de manifiesto un cambio rapido a altas temperaturas, siendo las curvas mas complejas a temperaturas inferiores. El recocido puede parecer complejo debido a la variedad de reacciones termicas del yodo intermedio. Este puede reaccionar con los siguientes productos: atomos de teluro de retroceso y la correspondiente zona caliente, transicion beta del {sup 131}Te y el propio TeO{sub 2}. Se examino la cinetica de estos cambios y se evaluaron los procesos observados durante el recocido. Asimismo se investigo la influencia ejercida por el flujo neu- tronico sobre la cinetica del recocido. (author) [Russian] Sistema joda-131 v TeO{sub 2} predstavljaet interes, potomu chto malo izvestno o termohimicheskih izmenenijah v jetoj misheni. Radioaktivnyj jod poluchalsja pri nejtronnom obluchenii TeO{sub 2} v reaktore. Obluchennyj TeO{sub 2} rastvorjalsja v razbavlennom rastvore NaOH. Analiz razlichnyh valentnyh form joda proizvodilsja ionoobmennym metodom. Izuchalis' termicheskaja i radiacionnaja ustojchivost' TeO{sub 2} putem ispol'zovanija spektrofotometricheskogo metoda dlja opredelenija tellura i otzhig joda-131 v TeO{sub 2} posle obluchenija v zavisimosti ot vremeni i temperatury nagreva. Glavnaja tendencija otzhiga sostojala v vosstanovlenii radioaktivnogo joda. Zavisimost' jetogo processa ot vremeni ukazyvaet na bystroe izmenenie pri vysokoj temperature. Pri bolee nizkih temperaturah krivye javljajutsja bolee slozhnymi. Otzhig verojatno javljaetsja slozhnym vvidu mnogoobrazija teplovyh reakcij, vkljuchajushhih promezhutochnye soedinenija joda. On mozhet vstupat' v reakciju s produktami processa otdachi jader tellura v sootvetstvujushhej gorjachej zone, beta-perehoda Te{sup 131} i s samoj dvuokis'ju tellura. Rassmatrivalas' kinetika jetih izmenenij i proizvodilas' ocenka processov vo vremja otzhiga. Izuchalos' takzhe vlijanie nejtronnogo potoka na kinetiku otzhiga. (author)}
place = {IAEA}
year = {1965}
month = {Apr}
}