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- W7465081 abstract "The content of radium in ocean deposits varies from 4 to 50 x 10/sup -12/ g/g, while the radium content in Black Sea deposits is relatively constant at 5 to 9 x 10/sup -13/ g/g (substantially lower than in ocean deposits). The radium content does not vary with the height of the core sample. The absolute content of ionium varies from 0.8 to 5.8 x 10/sup -10/ g/g (approximately that found in ocean deposits) with the higher ionium values being found in the surface layers. Since the Black Sea deposits are relatively young in age, the amount of ionium is almost always greater than the amount of radium, and the ionium and radium are not in equilibrium with each other. The uranium content in Black Sea deposits is 10 to 12 x 10/sup -6/ g/g (5 to 7 times greater than the uranium con tent in typical ocean deposits). The surface layers of the core sample have a higher uranium content than the lower layers. The precipitation of uranium is favored by the reducing conditions prevalent in the Black Sea. The ratio of thorium to uranium is low in the upper layers of the core sample, but rises to amore » value that is more typical of ocean deposits in the lower layers of the core sample (Th/U> 3). For the last 1500 years the rate of deposition in the Black Sea is estimated at 36 to 60 cm per 1000 years. This high rate of deposition accounts for the deficiency of radium in the Black Sea deposits. (TTT)« less" @default.
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- W7465081 date "1961-08-21" @default.
- W7465081 modified "2023-09-23" @default.
- W7465081 title "RADIOACTIVITY OF BLACK SEA DEPOSITS" @default.
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