Abstract
WE have succeeded in finding evidence of several isotopes of uranium which emit alpha-rays. In the expectation that the proportion of actino-uranium would be larger the younger the mineral, uranium from Colorado carnotite was used, the age of which has been variously estimated at from 170,000 to 7,000,000 years. The half-periods estimated by Wilkins1 and by Rutherford2 for actino-uranium, from quite different methods of reasoning, were 2.5 and 4.2 × 108 years respectively. The corresponding alpha-ray range would be about 3.2 cm.
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References
NATURE, 117, 719; 1926.
NATURE, 128, 313; 1929.
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WILKINS, T., RAYTON, W. Isotopes of Uranium. Nature 130, 475–476 (1932). https://doi.org/10.1038/130475b0
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DOI: https://doi.org/10.1038/130475b0
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