武蔵野台地の地下水中の<sup>234</sup>U/<sup>238</sup>U比  [in Japanese] <sup>234</sup>U/<sup>238</sup>U ratios in the groundwater samples from Musashino-daichi, western Tokyo  [in Japanese]

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Abstract

Concentrations of <sup>234</sup>U and <sup>238</sup>U in the groundwater samples from Musashino-daichi, western Tokyo have been measured by alpha-spectrometry. Observed range of <sup>234</sup>U and <sup>238</sup>U concentrations were about 0.2-3.5 and 0.3-9.3 dpm/100l, respectively, with the <sup>234</sup>U/<sup>238</sup>U activity ratios of 1.4-5.0 The presence of excess <sup>234</sup>U, together with the observed linear correlation with <sup>238</sup>U concentrations, indicates both excess <sup>234</sup>U and<sup>238</sup>U have been supplied by source materials which are uniform with respect to the ability of supplying recoilgenic <sup>234</sup>U and <sup>238</sup>U into the groundwaters. High tritium concentrations in many of the samples (Tanaka, 1983) indicate the groundwater samples were composed of two distinct water components: one with fairly long age of contact with U containing minerals (orders of 1000 yrs or more) and one with fairly short tritium age (less than about 30 yrs).

Journal

  • Chikyukagaku

    Chikyukagaku 17(2), 103-108, 1983

    The Geochemical Society of Japan

Cited by:  1

Codes

  • NII Article ID (NAID)
    110008679748
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0386-4073
  • NDL Article ID
    2969437
  • NDL Source Classification
    ME34(水文学--陸水)
  • 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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