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Extinct Radioactivity and the Discovery of a New Pleochroic Halo

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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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References

  1. Kohman, Truman P., J. Chem. Educ., 38, 73 (1961).

    Article  CAS  Google Scholar 

  2. Manuel, O. K., and Kuroda, P. K., J. Geophys. Res., 69, 1413 (1964).

    Article  ADS  CAS  Google Scholar 

  3. Fleischer, R. L., Price, P. B., and Walker, R. M., Gen. Electric Res. Lab. Report No. 65–R., L.–3894 M (Schenectady N.Y.).

  4. Poole, J. H. J., Delaney, C. F. G., and McCormick, R. C., Sci. Proc. Roy. Dublin Soc., 25, 101 (1950).

    Google Scholar 

  5. Mendes, F., Da Silveira, M., and Vieira, G., Garcia de Orta, 8, 113 (1960).

    CAS  Google Scholar 

  6. Joly, J., Nature, 109, 480 (1922).

    Article  ADS  Google Scholar 

  7. Gentry Robert, V., Amer. J. Phys., 33, 878A (1965).

    Google Scholar 

  8. Henderson, G. H., Proc. Roy. Soc., A, 173, 238 (1939).

    Article  ADS  CAS  Google Scholar 

  9. Henderson, G. H., Proc. Roy. Soc., A, 173, 250 (1939).

    Article  ADS  CAS  Google Scholar 

  10. Gentry Robert, V., Trans. Amer. Geophys. Union, 47, 487A (1966).

    Google Scholar 

  11. Henderson, G. H., and Bateson, S., Proc. Roy. Soc., A, 145, 563 (1934).

    Article  ADS  CAS  Google Scholar 

  12. Henderson, G. H., Mushkat, C. M., and Crawford, D. P., Proc. Roy. Soc., A, 158, 199 (1937).

    Article  ADS  CAS  Google Scholar 

  13. Fleischer, R. L., Price, P. B., and Walker, R. M., Science, 149, 383 (1965).

    Article  ADS  CAS  Google Scholar 

  14. Gentry, Robert V., Applied Phys. Lett., 8, 65 (1966).

    Article  ADS  CAS  Google Scholar 

  15. Gentry, Robert V., Earth Plan. Sci. Lett., 1, 453 (1966).

    Article  ADS  Google Scholar 

  16. Gentry, Robert V., Trans. Amer. Geophys. Union, 47, 421A (1966).

    Google Scholar 

  17. Gentry, Robert V., Bull. Amer. Phys. Soc., 12, 32 (1967).

    Google Scholar 

  18. Gentry, Robert V., AED-CON F-66-288-13.

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Authors and Affiliations

  1. Columbia Union College, Takoma Park, Maryland

    R. V. GENTRY

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  1. R. V. GENTRY
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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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