Behavior of uranium series nuclides around the Tono uranium mine, Gifu Prefecture, and their usefulness as natural analogs

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Authors:Kanai, Yutaka; Sakamaki, Yukio; Seo, Toshihiro
Author Affiliations:Primary:
Geol. Surv. Japan, Ibaraki, Japan
Volume Title:Special issue; Research on underground disposal of high-level radioactive waste (I)
Source:Special issue; Research on underground disposal of high-level radioactive waste (I). Chishitsu Chosajo Geppo = Bulletin of the Geological Survey of Japan, 42(5), p.249-260. Publisher: Kogyo Gijutsu-in-Chishitsu Chosajo, Kawasaki, Japan. ISSN: 0016-7665
Publication Date:1991
Note:In Japanese with English summary. 28 refs.; 4 tables, charts
Summary:The concentration of uranium series nuclides, 238U, 234U, 226Ra and 222Rn, were measured for ground- and surface waters around the Tono uranium mine. 238U contents in the groundwaters were in low level because of reducing condition with high pH. Such a condition may be favourable for the retention of uranium analogue nuclides in the high level radioactive wastes (HLRW). The 226Ra contents were higher than the equilibrium values of 238U, which suggests that radium was easier to move than uranium. 222Rn was much abundant in the groundwaters from several hundreds times to several ten thousands times than its precursor 226Ra. It is reasonably assumed that much of the radon was supplied by host granitic rocks and uraniferous orebody through micro paths (fractures). The waters from the Sublevel gallery of the Tono mine were low in radon content and 222Rn/226Ra activity ratios, of which hydrogeochemical data suggests that the water was not recharged from deep groundwaters, but from shallow ones. The behaviour of radon may be a good analogue for the gaseous nuclides released from the HLRW. [Authors' abstract]
Subjects:Actinides; Alkaline earth metals; Engineering geology; Geochemistry; Ground water; High-level waste; Isotopes; Metals; Noble gases; Pollution; Ra-226; Radioactive isotopes; Radioactive waste; Radium; Radon; Rn-222; U-234; U-235; Uranium; Waste disposal; Asia; Far East; Japan; Gifu Prefecture; Tono Mine
Record ID:1991058221
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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