Half-Life Determinations by Direct Decay

Abstract
Half-lives have been measured by direct decay for 18 radionuclides. The method of least squares was used to obtain the best straight-line fit to the data. The observed half-lives are 87.9 ± 0.3 d for S35, 52.7 ± 0.5 d for Sr89, 13.6 ± 0.3 y for Nb93m, 35.8 ± 0.5 d for Nb95, 65.5 ± 0.2 d for Zr95, 39.5 ± 0.3 d for Ru103, 368.0 ± 1.8 d for Ru106, 13.6 ± 0.2 y for Cd113, 76.3 ± 6.6 y for Sn121, 2.71 ± 0.02 y for Sb125, 1.99 ± 0.02 y for Cs134, 283.8 ± 0.6 d for Ce144, 2.60 ± 0.02 y for Pm147, 87 ± 9 y for Sm151, 134.2 ± 0.8 d for Tm170, 700± 5 d for Tm171, 3.68 ± 0.05 y for Tl204, and 164.4 ± 0.4 d for Cm242. These data are compared with current literature values, and average values of the existing determinations are given.

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