オクロ鉱床によるナチュラル・アナログ研究の現状と展望 (1993年度日本地球化学会奨励賞受賞記念)  [in Japanese] Recent studies and perspectives on the Oklo uranium ore as a natural analogue  [in Japanese]

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Author(s)

    • 日高 洋 HIDAKA Hiroshi
    • 東京都立大学理学部化学科 Department of Chemistry, Faculty of Science, Tokyo Metropolitan University

Abstract

The Oklo uranium ore in the Republic of Gabon is an ideal natural analogue for radioactive waste disposal in geosphere, because it has preserved abudant fissiogenic nuclides for 2 Ga. Isotopic studies of the Oklo fission reactor zones have been carried out to estimate the geochemical behavior of fissiogenic nuclides and to evaluate some nuclear parameneters for the reactor characterization. In a few years, new type of fission reactor zones has been found in the Oklo ore, and interesting information on the behavior of long-lived radionuclides such as <sup>90</sup>Sr, <sup>99</sup>Tc, <sup>135</sup>Cs and <sup>137</sup>Cs has been obtained. Cooperative isotopic measurements by whole rock analysis (with TIMS and ICP-MS) and by <i>in-situ</i> observation (with SIMS) make possible to clarify the retention and /or migration processes of fissiogenic nuclides over the wide range from μm to m. In this paper, recent studies and perspectives in near future on the behavior of radionuclides expected from Oklo study are reviewed.

Journal

  • Chikyukagaku

    Chikyukagaku 28(2), 143-154, 1994

    The Geochemical Society of Japan

Cited by:  1

Codes

  • NII Article ID (NAID)
    110008679895
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0386-4073
  • NDL Article ID
    3889387
  • NDL Source Classification
    ME51(鉱物・鉱床)
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJPref  NDL  NII-ELS  J-STAGE 
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