現生および化石貝殻のウラン含有量および<sup>234</sup>U/<sup>238</sup>U放射能比  [in Japanese] Uranium contents and <sup>234</sup>U/<sup>238</sup>U activity ratios of modern and fossil marine bivalle molluscan shells  [in Japanese]

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Author(s)

Abstract

Uranium contents and <sup>234</sup>U/<sup>238</sup>U activity ratios in modern and fossil marine bivalle molluscan shells were measured by alpha-spectrometry. Uranium contents and <sup>234</sup>U/<sup>238</sup>U activity ratios in modern shells were averaged to be 0.266 (dpm/g), and 1.18, respectivily and those in fossil shells were averaged to be 0.747 (dpm/g), and 1.19, respectivily. Uranium contents in fossil shells were obviously higher than those in modern shells. It can be explained by the addition of uranium to shell during the deposition. In fossil shells, <sup>234</sup>U/<sup>238</sup>U activity ratio decreases as <sup>238</sup>U content increases the same tendency is not found in modern shells. The author proposed a mechanism of selective loss of <sup>238</sup>U from the fossil shelle for the explanation of this tendency. The hight activity ratio of <sup>234</sup>U/<sup>238</sup>U measured on the fossil shells than that measured on the modern shells, also support the selective loss of <sup>238</sup>U from the fossil shells.

Journal

  • Chikyukagaku

    Chikyukagaku 17(2), 119-125, 1983

    The Geochemical Society of Japan

Codes

  • NII Article ID (NAID)
    110008679750
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • ISSN
    0386-4073
  • NDL Article ID
    2969612
  • NDL Source Classification
    ME71(古生物)
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    NDL  NII-ELS  J-STAGE 
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