Abstract
FROM the mass-spectrum of the mixture of lead isotopes isolated from Norwegian bröggerite Dr. F. W. Aston (NATURE, Mar. 2, 1929, p. 313) estimated the relative proportions of the individual isotopes to be approximately
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HOLMES, A. The Period of ‘Actino-uranium’ and its Bearing on the Ages of Radioactive Minerals. Nature 126, 348–349 (1930). https://doi.org/10.1038/126348b0
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DOI: https://doi.org/10.1038/126348b0
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