Inspection of residual flow using 224Ra/228Ra ratios in the semi-closed water body of Nakaumi, a coastal lagoon in southwest Japan

In order to investigate the water circulation, we examined 228 Ra/ 226 Ra and 224 Ra/ 228 Ra activity ratios of a man-made semi-closed brackish water body in Lake Nakaumi, southwest Japan. The 224 Ra/ 228 Ra ratios in the surface water were observed to be the lowest (0.02) in the central area, while...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2015-02, Vol.303 (2), p.1595-1599
Main Authors: Nomura, Ritsuo, Inoue, Mutsuo, Kofuji, Hisaki
Format: Article
Language:eng ; jpn
Subjects:
Chemistry
Chemistry and Materials Science
Diagnostic Radiology
Hadrons
Heavy Ions
Inorganic Chemistry
Nuclear Chemistry
Nuclear Physics
Physical Chemistry
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Summary:In order to investigate the water circulation, we examined 228 Ra/ 226 Ra and 224 Ra/ 228 Ra activity ratios of a man-made semi-closed brackish water body in Lake Nakaumi, southwest Japan. The 224 Ra/ 228 Ra ratios in the surface water were observed to be the lowest (0.02) in the central area, while those in the surrounding waters were higher (~0.1), thus suggesting the occurrence of an anticlockwise eddy circulation. The 224 Ra/ 228 Ra ratios in the deep waters were relatively uniform, but a basin-wide anticlockwise flow of water was also indicated.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-014-3680-2