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- W2243379531 abstract "The various unsuccessful attempts to isolate transuranic elements in nature prior to the discovery of Pu/sup 239/ in nature by Seaborg and Pearlman in 1942 are briefly reviewed. Further investigation show that the ration of Pu/sup 239/ to uranium is (2.0 plus or minus 0.3) x 10/sup -11/, and that the ratio of Pu/sup 238/ >s to Pu/sup 239/ is less than 3 x 10/sup -6/. If the half life of Pu/sup 24/ s/sup 4/ is assumed to be 9.8 x 10/sup 7/ years, it is possible that approximately 10/sup -13/ gram of Pu/sup 244/ may exist in 34 kg of thorium in a natural ore. The principal sources of neutrons in natural minerals are due to the fission of U/sup 235/ and various ( alpha ,n) reactions. The ratio of Pu/sup 239/ to uranium is low in minerals such as carnotite and tyrite because they have a low uranium content and a high content of other elements that absorb neutrons. If it is assumed that U/sup 233/ is formed principally by the alpha decay of Np/ sup 237/, the ratio of Np/sup 237/ to U/sup 238/ >s is (1.8 plus or minus 0.4) x 10/sup -12/ (according to Peppard).more » The role of the fission of Cf/sup 254/ to explain the occurrence of supernovae is discussed briefly. 52 references. (TTT).« less" @default.
- W2243379531 created "2016-06-24" @default.
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- W2243379531 date "1960-12-01" @default.
- W2243379531 modified "2023-09-23" @default.
- W2243379531 title "THE PRESENCE OF TRANSURANIC ELEMENTS IN NATURE" @default.
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