Half-Life of Rb 87
1956; American Institute of Physics; Volume: 103; Issue: 4 Linguagem: Inglês
10.1103/physrev.103.1045
ISSN1536-6065
AutoresL. T. Aldrich, G. W. Wetherill, G. R. Tilton, G. L. Davis,
Tópico(s)Radioactive element chemistry and processing
ResumoA comparison of the ratio, radiogenic ${\mathrm{Sr}}^{87}$/${\mathrm{Rb}}^{87}$, found in eight Rb minerals of differing Rb content from the same rock unit has shown this ratio to be constant for a given mineral assemblage. This ratio has been measured on Rb minerals from six rock units for which concordant U-Pb ages ranging from 375 to 2700 million years have also been obtained. From the ratio radiogenic ${\mathrm{Sr}}^{87}$/${\mathrm{Rb}}^{87}$ and the age of the mineral obtained from the U-Pg age, the half-life of R${\mathrm{B}}^{87}$ is calculated to be (5.0\ifmmode\pm\else\textpm\fi{}0.2)\ifmmode\times\else\texttimes\fi{}${10}^{10}$ yr. This lies in the range of values found by direct counting experiments.
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