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通过分析东浓砂岩型铀矿中采集的钻孔和平巷的岩石标本,研究了自然环境下铀系核素的性状。进行了化学分析和α、γ能谱测定。根据这些核素的化学特性及衰变常数,本文讨论了~(234)U/~(238)U、~(230)Th/~(234)U和~(224)Ra/~(230)Th的活度比,得出以下结论:(1)在沉积岩基质中,近1Ma以来保持了还原环境;(2)虽然观察到铀沿着断层和断裂迁移,但近1Ma来铀的主要运移活动是在岩石基质中进行的,最大的运移距离不超过1m;(3)东浓矿床中数千年来镭有活化现象。
The characteristics of uranium nuclides in natural environment were studied by analyzing the rock samples collected from boreholes and roadways in Dongnong sandstone-type uranium deposits. Chemical analysis and α, γ spectrometry were performed. Based on the chemical properties and decay constants of these radionuclides, we discussed the effects of ~ (234) U / ~ (238) U, ~ (230) Th / ~ (234) U and ~ (224) Ra / ~ Activity ratio, we can draw the following conclusions: (1) In the sedimentary basement, the reduction environment has been maintained since nearly 1Ma; (2) Although uranium is observed to migrate along faults and faults, the main migration activity of uranium Carried out in the rock matrix, the maximum migration distance does not exceed 1m; (3) the turquoise activation in the Thongau deposit for thousands of years.