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The use of Kr{sup 85} for the measurement of leaks in hermetically sealed components; Emploi du krypton-85 pour la detection des fuites dans les pieces hermetiquement scellees; Opredelenie utechki germeticheski izolirovannykh komponentov pri pomoshchi Kr''8''5; Empleo del {sup 85}Kr para la deteccion de fugas en piezas hermeticamente selladas

Abstract

Radioactive gases provide a method of leak detection in hermetically sealed components which in specific cases can be more sensitive by several orders of magnitude than conventional methods of leak detection. In this paper the use of Kr{sup 85} for this purpose is described. The gas can be used in two distinct ways. The first is to immerse the component in the gas under controlled conditions of pressure and time and measure the amount forced in under pressure by subsequent monitoring of the radiation transmitted through the walls of the component. In the second method some active gas is inserted before sealing and the subsequent loss of activity is a measure of the leak rate. The method chosen depends on the dimensions of the component and its proposed use. The chief limitation on the sensitivity in the first method is surface contamination due to absorption of the gas into the pores of the component material; the extent of this is discussed in the application of the method to the detection of leaks in transistor cans. Prefilling the component with active gas before sealing has the advantage that a long-term monitoring of the contents of the component is possible. This eliminates  More>>
Authors:
Berry, P F; Cameron, J F; [1]  Wilson, E J [2] 
  1. Wantage Research Laboratory (A. E. R. E.), Wantage, Berks. (United Kingdom)
  2. Radiochemical Centre, Amersham, Bucks. (United Kingdom)
Publication Date:
Jan 15, 1962
Product Type:
Conference
Resource Relation:
Conference: Conference on the Use of Radioisotopes in the Physical Sciences and Industry, Copenhagen (Denmark), 6-17 Sep 1960; Other Information: 2 figs, 1 tab., 6 refs; Related Information: In: Radioisotopes in the Physical Sciences and Industry. Proceedings of the Conference on the Use of Radioisotopes in the Physical Sciences and Industry. V. 1| 556 p.
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 36 MATERIALS SCIENCE; ABSORPTION; DETECTION; GASES; KRYPTON 85; LEAKS; MONITORING; SENSITIVITY; SURFACE CONTAMINATION
OSTI ID:
22025649
Research Organizations:
International Atomic Energy Agency, Vienna (Austria); United Nations Educational, Scientific and Cultural Organization, Paris (France)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA12N1628112942
Submitting Site:
INIS
Size:
page(s) 467-475
Announcement Date:
Jan 17, 2013

Citation Formats

Berry, P F, Cameron, J F, and Wilson, E J. The use of Kr{sup 85} for the measurement of leaks in hermetically sealed components; Emploi du krypton-85 pour la detection des fuites dans les pieces hermetiquement scellees; Opredelenie utechki germeticheski izolirovannykh komponentov pri pomoshchi Kr''8''5; Empleo del {sup 85}Kr para la deteccion de fugas en piezas hermeticamente selladas. IAEA: N. p., 1962. Web.
Berry, P F, Cameron, J F, & Wilson, E J. The use of Kr{sup 85} for the measurement of leaks in hermetically sealed components; Emploi du krypton-85 pour la detection des fuites dans les pieces hermetiquement scellees; Opredelenie utechki germeticheski izolirovannykh komponentov pri pomoshchi Kr''8''5; Empleo del {sup 85}Kr para la deteccion de fugas en piezas hermeticamente selladas. IAEA.
Berry, P F, Cameron, J F, and Wilson, E J. 1962. "The use of Kr{sup 85} for the measurement of leaks in hermetically sealed components; Emploi du krypton-85 pour la detection des fuites dans les pieces hermetiquement scellees; Opredelenie utechki germeticheski izolirovannykh komponentov pri pomoshchi Kr''8''5; Empleo del {sup 85}Kr para la deteccion de fugas en piezas hermeticamente selladas." IAEA.
@misc{etde_22025649,
title = {The use of Kr{sup 85} for the measurement of leaks in hermetically sealed components; Emploi du krypton-85 pour la detection des fuites dans les pieces hermetiquement scellees; Opredelenie utechki germeticheski izolirovannykh komponentov pri pomoshchi Kr''8''5; Empleo del {sup 85}Kr para la deteccion de fugas en piezas hermeticamente selladas}
author = {Berry, P F, Cameron, J F, and Wilson, E J}
abstractNote = {Radioactive gases provide a method of leak detection in hermetically sealed components which in specific cases can be more sensitive by several orders of magnitude than conventional methods of leak detection. In this paper the use of Kr{sup 85} for this purpose is described. The gas can be used in two distinct ways. The first is to immerse the component in the gas under controlled conditions of pressure and time and measure the amount forced in under pressure by subsequent monitoring of the radiation transmitted through the walls of the component. In the second method some active gas is inserted before sealing and the subsequent loss of activity is a measure of the leak rate. The method chosen depends on the dimensions of the component and its proposed use. The chief limitation on the sensitivity in the first method is surface contamination due to absorption of the gas into the pores of the component material; the extent of this is discussed in the application of the method to the detection of leaks in transistor cans. Prefilling the component with active gas before sealing has the advantage that a long-term monitoring of the contents of the component is possible. This eliminates the possibility of a leak closing up temporarily during the short-term pressure or vacuum test and provides an integrated value to the leak which is more useful. (author) [French] L'utilisation des gaz radioactifs pour la detection des fuites dans les elements hermetiquement scelles est une methode qui peut, dans certains cas, etre plusieurs fois plus sensible que les methodes classiques de detection des fuites. Le present memoire traite de l'utilisation du {sup 85}Kr a cette fin. Le gaz peut etre utilise de deux facons. La premiere consiste a immerger l'element dans le gaz pendant un temps determine et sous une certaine pression, et a evaluer ensuite la quantite de gaz introduite par pression en mesurant le rayonnement emis a travers les parois de l'element. La deuxieme methode consiste a introduire du gaz actif dans la piece avant de la sceller; la perte d'activite qui se produit par la suite permet de mesurer l'importance de la fuite. La methode adoptee depend des dimensions de l'element et de ce que l'on veut en faire. La principale limitation de la premiere methode, en ce qui concerne la sensibilite, est la contamination de la surface qui se produit par suite de l'absorption de gaz dans les pores du materiau dont est fait l'element; l'importance de cette absorption est examinee a propos de l'application de la methode a la detection des fuites dans les gaines de transistors. Le remplissage prealable de l'element avec un gaz actif offre l'avantage de rendre possible un controle du contenu de l'element sur une longue periode. Cela elimine la possibilite d'une interruption temporaire de la fuite, comme il peut s'en produire si l'on emploie l'autre methode, et l'on obtient en outre des donnees plus utiles puisqu'elles indiquent l'importance totale des fuites eventuelles. (author) [Spanish] La deteccion de fugas en piezas hermeticamente selladas puede realizarse con ayuda de gases radiactivos; en determinados casos la sensibilidad de la tecnica radioisotopica puede superar en varios ordenes.de magnitud a la de los metodos clasicos. Los autores describen la utilizacion del {sup 85}Kr para este fin. El gas puede emplearse de dos maneras. La primera consiste en sumergir la pieza en una atmosfera de dicho gas durante im tiempo y a una presion establecidos, y calcular seguidamente la cantidad que ha penetrado en su interior midiendo la intensidad de las radiaciones que atraviesan las paredes de la pieza. El segundo metodo consiste en introducir un gas radiactivo en la pieza antes de proceder a su cierre. En este caso, la disminucion de actividad subsiguiente constituye un indice de la velocidad de escape. La eleccion del metodo depende de las dimensiones de la pieza y del uso a que esta se destine. La contaminacion de la superficie debida a la absorcion de gas en los poros del material constituye el principal factor que limita la sensibilidad del primer metodo; los autores tratan de la gravedad de este efecto al estudiar la aplicacion de este metodo a la deteccion de fugas en cartuchos para transistores. La introduccion de gas radiactivo en la pieza antes de cerrarla presenta la ventaja de que es posible controlar el contenido de la pieza durante un largo periodo de tiempo. Con esto se elimina la posibilidad de que el orificio por el que se produce la fuga se obture pasajeramente en el momento en que se aplican la presion o el vacio, obteniendose ademas un valor integrado de la magnitud de la fuga, esto es, un dato de mayor utilidad. (author) [Russian] Radioaktivnye gazy obespechivayut metod opredeleniya utechki germeticheski izolirovannykh komponentov, kotoryj v osobykh sluchayakh mozhet byt' bolee chuvstvitel'nym na neskol'ko poryadkov moshchnosti, nezheli obychnye metody opredeleniya utechki. Dlya ehtoj tseli v nastoyashchem doklade privoditsya opisanie ispol'zovaniya Kg{sup 85}. Gaz mozhno ispol'zovat' dvumya putyami. V pervom sluchae komponent pogruzhaetsya v gaz pri kontroliruemykh usloviyakh davleniya i vremeni, a ego prosochivsheesya kolichestvo pod davleniem izmeryaetsya posleduyushchim kontrolirovaniem radiatsii, pronikshej cherez stenki komponenta. Vo vtorom sluchae nekotoroe kolichestvo aktivnogo gaza vvoditsya do izolyatsii, a posleduyushchaya poterya aktivnosti yavlyaetsya meroj skorosti utechki. Vybor metoda zavisit ot razmerov komponenta i ego naznacheniya. Osnovnym ogranicheniem chuvstvitel'nosti v pervom metode yavlyaetsya zarazhenie poverkhnosti, blagodarya proniknoveniyu gaza v pory materiala komponenta; razmery ehtogo proniknoveniya obsuzhdayutsya v primenenii metoda po opredeleniyu utechki v obolochkakh poluprovodnikovykh triodov. Predvaritel'noe zapolnenie komponenta aktivnym gazom do germetizatsii imeet preimushchestvo v tom, chto dlitel'nyj kontrol' nad soderzhaniem komponenta vozmozhen. EHto ustranyaet vozmozhnost' utechki, zakryvaya na vremya davlenie ili vakuum, i obespechivaet velichinu utechki, chto yavlyaetsya bolee poleznym. (author)}
place = {IAEA}
year = {1962}
month = {Jan}
}