MATHEMATICAL-MODELING OF THE RADIATION-CHEMICAL OXIDATION OF U(IV) IN HCLO4

Mathematical modeling of U(IV) oxidation in 0.5-12 M HClO4 upon alpha, gamma-radiolysis, based on the proposed scheme of radiation-chemical reactions, has been performed. The rate constants of the U(VI) + HO2, U(IV) + HO2, U(IV) + ClO2, and U(IV) + ClO2- reactions have been determined by the comparison of the calculated and experimental kinetic and dose curves and radiation-chemical yields of U(IV) oxidation or U(VI) formation. General equations for uranium(IV) oxidation constants at various HClO4 concentrations, based on the analysis of the rates of particular radiation-chemical reactions composing oxidation process, have been obtained.