Abstract
Half-lives of 192Tl and 193Tl have been determined by following the decay of conversion electron lines from mass separated sources in a β-spectrometer. From energy level systematics an (11·4 ± 1·4) min period is ascribed to a 7+ level in 192Tl; most likely the ground state has the same half-life within the limits of error. Predicted M4 isomers in 193Tl and 191Tl could not be confirmed. The ground state half-life of the former isotope was obtained as (22·6 ± 1·0) min, while that of the latter seems to be less than 10 min. An improved half-life of 191Au, (3·2 ± 0·1) hr, is reported.
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