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Values of the half-life of actinouranium are obtained from data on a Morogoro pitchblende and a uraninite from Great Bear Lake, analyzed by von Grosse and Marble, respectively. Computations were made with two extreme values, 0.03 and 0.04, for the actinium "branching ratio" B. Half-life values in 10⁸ years are:
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Western et al. (1934) studied this question.
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