(Table 1, pages 646) Uranium, thorium and protactinium analyses of selected manganese nodules from the Atlantic and Pacific oceans
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The Th230/Pa231 activity ratio in 7 of 11 manganese nodules is less than 10.8, the theoretical production ratio of activities in the ocean. This finding indicates difierential accumulation of these nuclides in authigenic deposits of manganese-iron oxide.
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Sackett, William M创建时间：
1966-01-01
