Using a null method, an ionization chamber and vibrating reed electrometer were employed to compare the γ-ray activity of an 192 Ir source with that of a reference 226 Ra source over a period of 209 days. An analysis of the results by the method of least squares indicates a half-life of 192 Ir of 74.17 ± 0.07 days.
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J. W. Allison (1960) studied this question.
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