RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Memory Effect of Ionization Chamber for Tritium Vapor
Toshiharu TAKEISHIMasabumi NISHIKAWAYuzuru MATSUMOTO
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1990 Volume 39 Issue 8 Pages 353-356

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Abstract

Tritium measurement system utilizing an ionization chamber is widely used but the memory effect often gives obstruction for accurate measurement.
We designed a method of tritium removal from electrode surface utilizing an isotope exchange reaction, namely, water vapor mixing to the process gas just before entering the ionization chamber, and good results were observed for an ionization chamber made of copper or stainless steel.
In case of the ionization chamber having stainless steel electrodes, smaller memory effect, though larger amount of tritium sorption, was observed than for the copper chamber, because of porous Fe3O4 film formed on stainless steel surface.

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© Japan Radioisotope Association
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