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The Technology and Applications of Large Fission Product Beta Sources; Technologie et applications des grandes sources beta de fission; Tekhnologiya i primenenie krupnykh istochnikov beta-izluchenij, ispuskaemykh produktami deleniya; Tecnologia y utilizacion de los productos de fision como fuentes de irradiacion beta de elevada intensidad

Conference:

Abstract

Beta emitters have not received consideration as large sources of radiation power because in the past, the radiation processes of interest have been based on particles with high penetration power; hence the great emphasis on gammas and artificially accelerated electrons. About four years ago, it became apparent that a broad field of potential applications involving surface radiation treatment was developing, e. g. surface modification of formed plastics by graft copolymerization and surface pasteurization of food. For these applications, penetration in depth is wasteful and potentially harmful. Also there are two other areas for which machine electrons were not well suited: radiation-induced chemical syntheses in pressure vessels, and certain types of free radical chain reactions for which the production rate per kilowatt decreases with the square root of the dose rate. Broad area beta sources showed obvious potential advantages in all these categories and, since they are available in good yield from the fission process, merited a careful re-appraisal. On the basics of these considerations an AEC sponsored study of the applications and technology of fission product beta sources was performed. The results indicate the following: 1. There are promising areas for commercial application of fission product beta emitters in the  More>>
Authors:
Silverman, Joseph [1] 
  1. Radiation Applications Incorporated (United States)
Publication Date:
Jul 15, 1960
Product Type:
Conference
Resource Relation:
Conference: Conference on the application of large radiation sources in industry, Warsaw (Poland), 8-12 Sep 1959; Other Information: 7 figs., 1 tab., 8 refs.; Related Information: In: Large radiation sources in industry. Proceedings of a conference on the application of large radiation sources in industry. V. I| 492 p.
Subject:
36 MATERIALS SCIENCE; ABSORPTION; BETA SOURCES; CHAIN REACTIONS; COPOLYMERIZATION; DOSE RATES; EFFICIENCY; ELECTRONS; FISSION; FISSION PRODUCTS; GRAFTS; PARTICLES; PASTEURIZATION; PLASTICS; PRESSURE VESSELS; SURFACES; SYNTHESIS
OSTI ID:
22028501
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA12R0184116767
Submitting Site:
INIS
Size:
page(s) 31-53
Announcement Date:
Jan 18, 2013

Conference:

Citation Formats

Silverman, Joseph. The Technology and Applications of Large Fission Product Beta Sources; Technologie et applications des grandes sources beta de fission; Tekhnologiya i primenenie krupnykh istochnikov beta-izluchenij, ispuskaemykh produktami deleniya; Tecnologia y utilizacion de los productos de fision como fuentes de irradiacion beta de elevada intensidad. IAEA: N. p., 1960. Web.
Silverman, Joseph. The Technology and Applications of Large Fission Product Beta Sources; Technologie et applications des grandes sources beta de fission; Tekhnologiya i primenenie krupnykh istochnikov beta-izluchenij, ispuskaemykh produktami deleniya; Tecnologia y utilizacion de los productos de fision como fuentes de irradiacion beta de elevada intensidad. IAEA.
Silverman, Joseph. 1960. "The Technology and Applications of Large Fission Product Beta Sources; Technologie et applications des grandes sources beta de fission; Tekhnologiya i primenenie krupnykh istochnikov beta-izluchenij, ispuskaemykh produktami deleniya; Tecnologia y utilizacion de los productos de fision como fuentes de irradiacion beta de elevada intensidad." IAEA.
@misc{etde_22028501,
title = {The Technology and Applications of Large Fission Product Beta Sources; Technologie et applications des grandes sources beta de fission; Tekhnologiya i primenenie krupnykh istochnikov beta-izluchenij, ispuskaemykh produktami deleniya; Tecnologia y utilizacion de los productos de fision como fuentes de irradiacion beta de elevada intensidad}
author = {Silverman, Joseph}
abstractNote = {Beta emitters have not received consideration as large sources of radiation power because in the past, the radiation processes of interest have been based on particles with high penetration power; hence the great emphasis on gammas and artificially accelerated electrons. About four years ago, it became apparent that a broad field of potential applications involving surface radiation treatment was developing, e. g. surface modification of formed plastics by graft copolymerization and surface pasteurization of food. For these applications, penetration in depth is wasteful and potentially harmful. Also there are two other areas for which machine electrons were not well suited: radiation-induced chemical syntheses in pressure vessels, and certain types of free radical chain reactions for which the production rate per kilowatt decreases with the square root of the dose rate. Broad area beta sources showed obvious potential advantages in all these categories and, since they are available in good yield from the fission process, merited a careful re-appraisal. On the basics of these considerations an AEC sponsored study of the applications and technology of fission product beta sources was performed. The results indicate the following: 1. There are promising areas for commercial application of fission product beta emitters in the radiation processing field, particularly in the graft copolymerization modification of formed plastic surfaces and textiles. 2. Massive, rugged, inert, safe, inexpensive beta sources may be fabricated by suitable extensions of existing techniques. Source-bearing glass formulations show particular promise. 3. Beta absorption calculations indicate that extended sources can be designed with power utilization efficiencies as high as 20 per cent. Equations and curves describing dosage and beta utilization efficiency as a function of the geometry and composition of various source-target systems were developed. An experimental program is in progress to test the validity of the calculations. 4. An engineering cost analysis indicates that fission product beta power can be competitive with alternative sources of radiation. (author) [French] Si les emetteurs beta ne sont pas entres en ligne de compte en tant que sources de rayonnement de grandes dimensions, c'est que dans le passe les procedes sous irradiation presentant un interet pour l'industrie etaient bases sur l'utilisation de particules a grand pouvoir de penetration; de la l'importance considerable que l'on accordait aux rayons gamma et aux electrons artificiellement acceleres. Il y a environ quatre ans, il devint evident que de vastes perspectives s'ouvraient aux applications pratiques des rayonnements beta dans le domaine du traitement par irradiation superficielle, par exemple, la modification par copolymerisation greffee de la surface des moulages en matiere plastique et la pasteurisation superficielle des aliments. En effet, l'irradiation en profondeur occasionne dans ces cas des pertes et peut meme presenter des dangers. D'autre part, il y a deux autres domaines dans lesquels l'utilisation des electrons artificiellement acceleres ne semble pas indiquee; ce sont les syntheses chimiques amorcees par irradiation dans des cuves sous pression et certaines categories de reactions en chaine provoquees par des radicaux libres pour lesquels le taux de production par kilowatt decroit en fonction de la racine carree de l'intensite d'irradiation. Dans tous ces domaines, les sources beta de grandes dimensions presentent des avantages potentiels evidents; puisque la fission nucleaire permet d'en obtenir en quantites importantes, elles meritent que leurs- possibilites d'utilisation fassent l'objet d'un examen approfondi. Compte tenu de ces considerations, on a procede - sous l'egide de la Commission de l'energie atomique - a une etude des applications'et de la technologie des sources beta de fission. Cette etude a permis d'aboutir aux conclusions suivantes: 1. Des perspectives interessantes s'ouvrent a l'application commerciale des emetteurs beta de fission dans le domaine de la radiochimie industrielle, notamment dans celui de la modification superficielle par copolymerisatio n greffee des objets en matiere plastique et des textiles synthetiques. 2. Le developpement approprie des methodes existantes pourrait permettre la production de sources beta massives, resistantes, chimiquement inertes, ne presentant aucun danger et d'un prix peu eleve. Les sources enrobees de verre semblent particulieremen t riches en promesses. 3. Les calculs du taux d'absorption beta montrent qu'il est possible de concevoir des sources de grandes dimensions produisant jusqu'a 20 pour cent d'energie utile. On a etabli des equations et des courbes indiquant la dose et le coefficient d'utilisation en fonction de la forme geometrique et de la composition des divers ensembles source-cible. On est en train de realiser un programme d'experiences pour verifier l'exactitude de ces calculs. 4. Une analyse du cout de l'equipement montre que, du point de vue du prix de l'energie obtenue, les sources beta de fission peuvent rivaliser avec d'autres sources de rayonnements. (author) [Spanish] Hasta hace poco no se habia considerado la posibilidad de utilizar los emisores beta como fuentes de radiacion de elevada intensidad, pues todos los tratamientos por irradiacion que ofrecen interes se basaban en el empleo de particulas de gran poder de penetracion; por ello, se daba mucha importancia a las particulas gamma y a los electrones artificialmente acelerados. Hace unos cuatro anos comenzo a vislumbrarse la posibilidad de aplicar los tratamientos por irradiacion superficial en multiples campos, por ejemplo, para la modificacion por copolimerizacio n de injerto de la superficie de los materiales plasticos moldeados y para la pasteurizacion superficial de los alimentos. En estos casos la penetracion de las radiaciones en las capas internas de los materiales es innecesaria e incluso puede ser nociva. Existen otros dos campos en los cuales no conviene emplear electrones artificialmente acelerados; las sintesis quimicas radioinducidas que se lleven a cabo en recipientes a presion y varios tipos de reacciones en cadena inducidas por radicales libres cuyo indice de produccion por kilowatio disminuye en funcion de la raiz cuadrada de la intensidad de la dosis. Las fuentes beta de gran extension presentan sin duda ventajas en todas estas operaciones y, como pueden obtenerse con buen rendimiento en los procesos de fision, merecen un nuevo y detenido examen. Basandose en estas consideraciones , el autor efectuo un estudio, patrocinado por la Comision de Energia Atomica de los Estados Unidos, sobre las aplicaciones y la tecnologia de los productos de fision como fuentes de irradiacion beta. Los resultados obtenidos fueron los siguientes: 1. Existen posibilidades de aplicacion comercial de los productos de fision como emisores beta en los tratamientos por irradiacion, especialmente para la modificacion por copolimerizacio n de injerto de la superficie de los materiales plasticos moldeados y de las fibras sinteticas. 2. Perfeccionando convenientement e las tecnicas existentes, pueden fabricarse fuentes beta potentes, resistentes, inertes, seguras y economicas. Los productos de fision incorporados en vidrio parecen ser las mas prometedoras. 3. Los calculos de la absorcion de particulas beta indican que pueden di- senarse fuentes de gran extension cuyo rendimiento alcance al 20 por ciento. El autor ha formulado ecuaciones y ha trazado curvas que indican la variacion de las dosis del rendimiento beta en funcion de las relaciones geometricas y de la composicion de varios sistemas fuente-blanco. Se esta llevando a cabo un programa de experiencias para comprobar la validez de estos calculos. 4. El analisis de los costos indica que, en el plano economico, los productos de fision pueden competir como emisores beta con otras fuentes de radiacion. (author) [Russian] Beta-izluchatel i ne vkhodili ran'she v raschet v kachestve krupnykh istochnikov izlucheniya, tak kak v proshlom predstavlyayushchie interes protsessy oblucheniya osnovyvalis' na ispol'zovanii chastits, obladayushchikh sposobnost'yu glubokogo proniknoveniya; poehtomu glavnoe vnimanie sosredotochivalos' na ispol'zovanii gamma-izluchenij i iskusstvenno uskorennykh ehlektronov. Okolo chetyrekh let tomu nazad stalo ochevidnym, chto otkryvaetsya shirokaya oblast' vozmozhnykh primenenij, svyazannykh s poverkhnostnym oblucheniem, kak naprimer, izmenenie poverkhnosti obrazovavshegos ya sloya plastmassy putem sopolimerizatsionnogo narashchivaniya i poverkhnostnoj pasterizatsii pishchevykh produktov. Dlya ehtikh primenenij proniknovenie v glubinu yavlyaetsya neehkonomnym, a vozmozhno i vrednym. Est'eshche dve drugie oblasti, v kotorykh proizvedennye mekhanicheskim putem ehlektrony ne ochen' podkhodyat: khimicheskij sintez v nakhodyashchikhsya pod davleniem sosudakh s primeneniem oblucheniya i nekotorye vidy tsepnykh reaktsij so svobodnymi radikalami, dlya kotorykh proizvoditel'nost ' na kilovatt umen'shaetsya proportsional'no kvadratnomu kornyu moshchnosti dozy. Istochniki beta-izluchenij s shirokim polem pokazali ochevidnye potentsial'ny e preimushchestva dlya vsekh ehtikh operatsij i poskol'ku oni poluchayutsya v bol'shikh kolichestvakh za schet protsessov deleniya, to predstavlyalos ' tselesoobrazny m sdelat' tshchatel'nuyu pereotsenku vozmozhnostej ikh primeneniya. Vvidu ehtogo pod pokrovitel'stvom Komissii po atomnoj ehnergii SSHA bylo proizvedeno issledovanie primenenij i tekhnologii istochnikov beta-izluchenij, ispuskaemykh produktami deleniya. EHto issledovanie privelo k sleduyushchim rezul'tatam: 1. Otkryvayutsya perspektivny e vozmozhnosti primeneniya v kommercheskom masshtabe istochnikov beta-izluchenij, ispuskaemykh produktami deleniya, v oblasti oblucheniya produktov, v osobennosti dlya izmeneniya putem sopolimerizatsionnogo narashchivaniya obrazovavshikhsya poverkhnostnykh sloev plastmassy i tekstilya. 2. Massivnye, prochnye, inertnye, bezopasnye i nedorogie istochniki beta-izluchenij mogut stroit'sya putem nadlezhashchego rasshireniya sushchestvuyushchikh tekhnicheskikh ustanovok. Osobenno mnogoobeshchayushchimi predstavlyayutsya zaklyuchayushchie v sebe istochniki steklyannye ampuly. 3. Podschety pogloshcheniya beta-izluchenij pokazyvayut, chto predstavlyaetsya vozmozhnym skonstruirovat netochechnye istochniki s dostatochno vysokim kpd ispol'zovani ya moshchnosti, dokhodyashchim do 20%. Byli vyvedeny uravneniya i sostavleny krivye dayushchie dozirovku i kpd ispol'zovani ya beta-izluchenij v zavisimosti ot konfiguratsii izluchatelya, sostava veshchestv i materialov, vkhodyashchikh v konstruktsiyu istochnika i misheni. Dlya proverki pravil'nosti ehtikh podschetov v nastoyashchee vremya provoditsya ehksperimental'na ya programma. 4. Izuchenie proizvodstvennoj sebestoimosti ukazyvat, chto beta-izlucheniya, ispuskaemye produktami deleniya, mogut konkurirovat' s drugimi istochnikami izluchenij. (author)}
place = {IAEA}
year = {1960}
month = {Jul}
}