Uranium, thorium, and protactinium in a manganese nodule
Uranium, thorium, and protactinium in a manganese nodule
复制标题
锰结核中的铀、钍和镤
DOI：
10.1016/0012-821x(67)90148-3
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发表时间：
1967
影响因子：
5.3
通讯作者：
W. Broecker
中科院分区：
文献类型：
--
作者：
T. Ku;W. Broecker
Isotopic compositions of uranium, thorium and protactinium have been determined in a manganese nodule dredged from the North Pacific Ocean. Both the230Th and231Pa activities are found to decay exponentially with depth in the nodule. The corresponding accretion rate of the nodule, averaged over the past several hundred thousands of years, is about 4 mm/106y. The depth distribution of the unsupported234U activities in the nodule indicate that the234U/238U ratio of the oceanic uranium has undergone a rather minor change for the last few hundred thousand years. The fluctuation has been no more than ±2% of the present value of 1.15.
