Abstract
A coincidence circuit is described which makes possible the determination of half-value periods between 10
-4
sec. and 1 sec. using a single Geiger counter. This arrangement has been used to determine the half-value periods of actinium A, thorium A and radium C' with the following results: AcA ( 1·83 ± 0·04) x 10
-3
sec., ThA (1·58 ± 0·08) x 10
-1
sec., RaC ' (1·48 ± 0·06) x 10
-4
sec. A discussion of the limitations of the method and of possible sources of error is given.
Cited by
28 articles.
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