Concentrations of 226Ra and 228Ra in Hot Spring Waters from Tokyo Metropolis and Its Vicinity, Japan
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- Nakano-Ohta T.
- Research Reactor Institute , Kyoto University
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- Kubota T.
- Research Reactor Institute , Kyoto University
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- Sato J.
- School of Science and Technology, Meiji University
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- Mahara Y.
- Research Reactor Institute , Kyoto University
書誌事項
- タイトル別名
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- Concentrations of <SUP>226</SUP>Ra and <SUP>228</SUP>Ra in Hot Spring Waters from Tokyo Metropolis and Its Vicinity, Japan
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The average concentrations of 226Ra and 228Ra in the water in hot springs in and around metropolitan Tokyo were 39 mBq L-1 and 55 mBq L-1 for NaCl-type water and 0.6 mBq L-1 and 0.8 mBq L-1 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 228Ra/226Ra activity ratio was found to be related with Si concentration, showing that the activity ratio decreased with an increase of H2SiO3 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 228Ra/226Ra in hot spring water might be different between the NaCl and simple alkaline type, suggesting that the (228Ra/226Ra) t=0 activity ratio for residence time at t = 0 might be different for the two types.
収録刊行物
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- Journal of Nuclear and Radiochemical Sciences
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Journal of Nuclear and Radiochemical Sciences 8 (2), 143-148, 2007
日本放射化学会
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詳細情報 詳細情報について
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- CRID
- 1390001204481599616
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- NII論文ID
- 10021102192
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- NII書誌ID
- AA11948402
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- COI
- 1:CAS:528:DC%2BD2sXhsVCgtbvJ
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- ISSN
- 18835813
- 13454749
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- 本文言語コード
- en
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- データソース種別
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- JaLC
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- 使用不可