A review of recent geochemical measurements on the double-beta decay of 82Se, 128Te and 130Te suggests that the current 'best' value for the decay rate of 128Te relative to that of 130Te is 4*10-4 and the current 'best' values for individual half-lives are as follows: 1*1020 y for 82Se, 2*1024 y for 128Te, and 8*1020 y for 130Te.
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O. K. Manuel (1991) studied this question.
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