Abstract
A natural polymineral compound in which the major uranium-containing mineral is polycrase (Ti- Ta-niobate) described by the formula АВ2О6 was chosen as a model for studying the behavior of recoil atoms produced by α-decay of actinides. Polycrase, despite its metamict structure, is characterized by the following features distinguishing it from Ti-Ta-niobates of the formula А2В2О7 (pyrochlore and betafite): (1) 1/3 of uranium atoms preserve the initial valence state, U(IV); (2) the U(IV) fraction is characterized by the isotope activity ratio AR(234U/238U) close to that at secular equilibrium; (3) the uranium atoms that underwent oxidation “memorize” their radiogenic origin; as a result, the AR(234U/238U) ratio in the U(VI) fraction is 0.90, and in the most altered part of the mineral it decreases to 0.77; (4) the parent uranium is relatively stable in the metamict structure of polycrase: The half-leaching time for 238U atoms is 2 times longer than that in betafite, zircon, or sphene.
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Original Russian Text © M. Hosseinpour Khanmiri, R.V. Bogdanov, 2018, published in Radiokhimiya, 2018, Vol. 60, No. 1, pp. 74–85.
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Hosseinpour Khanmiri, M., Bogdanov, R.V. Nuclear Chemical Effects in the Paragenetic Mineral Association Based on Polycrase. Radiochemistry 60, 79–91 (2018). https://doi.org/10.1134/S1066362218010137
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DOI: https://doi.org/10.1134/S1066362218010137