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Measurement of the Activity OF /cap beta/ Emitting Gases Using an Ionisation Chamber; MESURE DE L'ACTIVITE DES GAZ EMETTEURS /cap beta/ AU MOYEN D'UNE CHAMBRE D'IONISATION

Technical Report ·
OSTI ID:4663046
An ionization chamber was developed for measuring directly the activity of a BETA -emitting gas whatever the gas may be. The following two parameters are defined and determined: p, the average specific ionization produced by a BETA desintegration, and l, the average BETA path in the chamber. It was shown, during the determination of l, that the BETA particles are reflected on the walls of the ionization chamber when the latter are made of a high atomic number material. It was possible to eliminate this effect by constructing an electrode chamber made of graphite. With this chamber a direct measurement can be made of the activity of a gaseous BETA emitter with a precision of about plus or minus 10%. Some applications are given of the graphite electrode chamber (calibration of the chambers built industriaily and determination of the activation cross section of a gaseous emitier). It was possible to determine the activation cross section of Xe/sup 134/; a value of 0.18 plus or minus 0.03 barn was found. (auth)
Research Organization:
France. Commissariat a l'Energie Atomique. Centre d'Etudes Nucleaires, Saclay
NSA Number:
NSA-17-032398
OSTI ID:
4663046
Report Number(s):
CEA-2215
Country of Publication:
France
Language:
English