期刊
PHYSICAL REVIEW LETTERS
卷 93, 期 17, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.93.172501
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The decay of Hf-182, now extinct, into stable W-182 has developed into an important chronometer for studying early solar system processes such as the accretion and differentiation of planetesimals and the formation of the Earth and the Moon. The only Hf-182 half-life measurements available were performed 40 years ago and resulted in an imprecise half-life of (9 +/- 2) x 10(6) yr. We redetermined the half-life by measuring the specific activity of 182Hf based on two independent methods, resulting in a value of t(1/2) (Hf-182) = (8.90 +/- 0.09) x 10(6) yr, in good agreement with the previous value, but with a 20 times smaller uncertainty. The greatly improved precision of this half-life now permits very precise intercalibration of the Hf-182 -W-182 isotopic system with other chronometers.
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