Anomalously high 234U/238U activity ratios of Tatsunokuchi hot spring waters, Ishikawa Prefecture, Japan

被引：0
|
作者：
M. Yamamoto
T. Sato
K. Sasaki
K. Hama
T. Nakamura
K. Komura
机构：
[1] Kanazawa University,Low Level Radioactivity Laboratory
[2] Kanagawa University Division of Global Environmental Science and Engineering,Department of Applied Chemistry, Faculty of Engineering
[3] Graduate School of Natural Science and Technology,Department of Cultural Properties and Heritage
[4] Kanazawa Gakuin University,Tono Geoscience Center
[5] Japan Nuclear Cycle Development Institute,Center for Chronological Research
[6] Nagoya University,undefined
来源：
Journal of Radioanalytical and Nuclear Chemistry | 2003年 / 255卷
关键词：
Japan; Physical Chemistry; Inorganic Chemistry; Uranium; 234U;
D O I：
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学科分类号：
摘要：
Uranium concentration and the 234U/238U activity ratio have been measured for the Tatsunokuchi hot spring waters of Ishikawa Prefecture in Japan, collected periodically over a long period (1977-2000). The concentration of 238U varied drastically between 0.045 and 1.02 mBq/l (a factor of about 20), while the 234U concentration was almost unchanged, ranging from 2.30 to 3.07 mBq/l. Resultant 234U/238U activity ratios showed a wide range from 2.7 to 51. Equilibrium calculation by using the geochemical code showed that U for one end-member representing low uranium contents and very high 234U/238U ratios was expected to exist as UO2(CO3)22-. By using the U isotopic and 14C dating methods, the age of this water was roughly estimated to be in the range of 104-105 years.
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页码：369 / 373
页数：4
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