234Th238U radioactive disequilibrium in the surface layer of the ocean |
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Authors: | Eiji Matsumoto |
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Institution: | Geological Survey of Japan, 135 Hisamoto-cho, Kawasaki-ski, Japan |
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Abstract: | 234Th produced from 238U within sea water was found to be in radioactive disequilibrium with respect to its progenitor nuclide 238U in the surface layer of the ocean. The median value for activity ratio is 0.80 in the upper 200 m layer. A box-model calculation gives a removal residence time of thorium of about 0.38 yr. This suggests that 234Th is scavenged from the surface layer by the uptake of thorium by biota. |
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