Abstract
In order to investigate the water circulation, we examined 228Ra/226Ra and 224Ra/228Ra activity ratios of a man-made semi-closed brackish water body in Lake Nakaumi, southwest Japan. The 224Ra/228Ra 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 224Ra/228Ra ratios in the deep waters were relatively uniform, but a basin-wide anticlockwise flow of water was also indicated.
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