Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Anomalies in the Counting Rate of the Solid Thin Film of Tritiated Lauric Acid in Relation to its Film Structure
Kazuo TajimaTsunetaka SasakiMitsuo Muramatsu
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1963 Volume 36 Issue 6 Pages 700-703


A thin film of α, β-ditritiated lauric acid CH3(CH2)8(CHT)2COOH deposited from benzene on a stainless steel dish and put in a 2π gas-flow windowless counter gave a counting rate which decreased far more rapidly than was expected from the natural decay of the β-activity of tritium. We observed a distinct break point in the decay curve ten days after the deposition of the film, independent of the amount of sample taken, provided that the film was sufficiently thin.
Various factors, such as impurities, surface migration, exchange reaction and evaporation, were considered to explain the phenomena; among these the evaporation of the lauric acid from the deposited surface film of the composite structure was proved to be the main factor responsible for these phenomena.

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