Concentrations of ^<226>Ra and ^<228>Ra in Hot Spring Waters from Tokyo Metropolis and Its Vicinity, Japan

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The average concentrations of <SUP>226</SUP>Ra and <SUP>228</SUP>Ra in the water in hot springs in and around metropolitan Tokyo were 39 mBq L<SUP>-1</SUP> and 55 mBq L<SUP>-1</SUP> for NaCl-type water and 0.6 mBq L<SUP>-1</SUP> and 0.8 mBq L<SUP>-1</SUP> for simple alkaline-type water, respectively. From the chemical characteristics, the hot spring waters from the Kazusa and Miocene formations are classified as NaCl and that from the Shimanto and Chichibu formations is simple alkaline. This indicates that the concentrations of Ra isotopes are high for the NaCl type and low for the simple alkaline type and are correlated with the relevant sedimentation layer from which the hot spring water is welled up. Good correlation was observed for the ratios in the concentrations of Ra/Na and Ra/Cl in both types of hot spring water. The correlation patterns of Ra/Na and Ra/Cl for the simple alkaline type and sedimentary rock were different from those for the NaCl type and seawater, suggesting that the origin of the Ra isotopes may be different. The <SUP>228</SUP>Ra/<SUP>226</SUP>Ra activity ratio was found to be related with Si concentration, showing that the activity ratio decreased with an increase of H<SUB>2</SUB>SiO<SUB>3</SUB> for both the NaCl and the simple alkaline type. Assuming that the Ra isotopes in hot spring water were supplied from the relevant rock in the aquifer together with Si, the activity ratio of <SUP>228</SUP>Ra/<SUP>226</SUP>Ra in hot spring water might be different between the NaCl and simple alkaline type, suggesting that the (<SUP>228</SUP>Ra/<SUP>226</SUP>Ra) <SUB>t=0</SUB> activity ratio for residence time at t = 0 might be different for the two types.

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  • Journal of Nuclear and Radiochemical Sciences

    Journal of Nuclear and Radiochemical Sciences 8(2), 143-148, 2007-12-01

    The Japan Society of Nuclear and Radiochemical Sciences

参考文献:  16件中 1-16件 を表示

  • <no title>

    NAKANO-OHTA T.

    Radioisotopes 54, 531, 2005

    被引用文献1件

  • <no title>

    SATO J.

    J. Soc. Eng. Mineral Springs Jpn. 10, 47, 1975

    被引用文献1件

  • <no title>

    SAITO T.

    J. Balneol. Soc. Jpn. 52, 3, 2002

    被引用文献1件

  • <no title>

    NAKANO-OHTA T.

    J. Balneol. Soc. Jpn. 56, 37, 2006

    被引用文献1件

  • <no title>

    KANROJI Y.

    J. Balneol. Soc. Jpn. 27, 32, 2000

    被引用文献1件

  • <no title>

    OMORI M. Ed.

    Nichiyo-no-chigaku, 1989

    被引用文献1件

  • <no title>

    KAIZUKA S.

    J. Geography 96, 223, 1987

    被引用文献1件

  • <no title>

    KAIZUKA S. Ed.

    Tokyo-no-shizenshi, 1979

    被引用文献1件

  • <no title>

    SAKAI A.

    Geology of the Itsukaichi district. With geological sheet map at 1:50,000, 1987

    被引用文献1件

  • <no title>

    MITSUCHI T.

    Explanatory text of the geological map of Japan at 1:75,000, 1932

    被引用文献1件

  • <no title>

    KURAMOCHI F.

    J. Geography 65, 46, 1956

    被引用文献1件

  • <no title>

    SEKI Y.

    J. Balneol. Soc. Jpn. 54, 1, 2004

    被引用文献1件

  • <no title>

    NAKANO-OHTA T.

    Radioisotopes 55, 443, 2006

    被引用文献1件

  • <no title>

    NAKANO-OHTA T.

    Bunsekikagaku 54, 219, 2005

    被引用文献1件

  • <no title>

    YAMAMOTO M.

    J. Balneol. Soc. Jpn. 44, 18, 1994

    被引用文献1件

  • Radium isotopes in coastal and open ocean surface water of the western North Pacific

    YAMADA M.

    Marine Chem. 19, 379-389, 1986

    被引用文献4件

各種コード

  • NII論文ID(NAID)
    10021102192
  • NII書誌ID(NCID)
    AA11948402
  • 本文言語コード
    ENG
  • 資料種別
    REV
  • ISSN
    13454749
  • データ提供元
    CJP書誌  J-STAGE 
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