Authors:
A. Sakaguchi Low Level Radioactivity Laboratory, K-INET, Kanazawa University Tatsunokuchi 923-1224 Ishikawa Japan

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M. Yamamoto Low Level Radioactivity Laboratory, K-INET, Kanazawa University Tatsunokuchi 923-1224 Ishikawa Japan

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T. Shimizu Low Level Radioactivity Laboratory, K-INET, Kanazawa University Tatsunokuchi 923-1224 Ishikawa Japan

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S. Koshimizu Yamanashi Institute of Environmental Sciences Fujiyoshida 403-0005 Yamanashi Japan

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Abstract  

Sediment cores from Lake Kawaguchi at the foot of Mt. Fuji in Japan were analyzed for U and Th isotopes (238U, 234U, 232Th, 230Th and 228Th) in the light of the linkage to paleoenvironmental changes. These isotopic concentrations and their ratios varied widely with depth of sediment core. A marked disequilibrium (1.1–1.5) higher than the value of 1.0 was observed for 234U/238U activity ratios, indicating that U from lake water with high 234U/238U ratio (ca. 1.6) was transferred to the bottom sediment by adsorption and/or adhesion onto the settling particles. By using model equations, the U found in the sediment core was separated into lithogenous and autogenous U fractions. These depth profiles were compared with parameters such as organic matter and biogenic-SiO2 contents and amount of rainfall. Some variations of selected parameters with depth coincided with those of lithogenous or autogenous U. The results obtained suggest that variation in the lithogenous and/or autogenous U in the sediment with depth might be helpful in tracing the geochemical behavior of U and the past environmental changes in the area surrounding Lake Kawaguchi.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)