Abstract
BECAUSE of the cosmological implications of such a discovery1, considerable effort has been expended toward the detection of extinct radioactivity in crustal rocks and meteorites. An excess of fissiogenic xenon isotopes in the Fayetteville meteorite2 and the presence of excess fission tracks in the Toluca meteorite3 have in each case been considered possible evidence of spontaneous fission from the extinct nuclide plutonium-244. Although an earlier search for the neptunium series in nature failed to reveal its existence4, later results suggest that it may exist5.
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GENTRY, R. Extinct Radioactivity and the Discovery of a New Pleochroic Halo. Nature 213, 487–489 (1967). https://doi.org/10.1038/213487a0
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DOI: https://doi.org/10.1038/213487a0
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