Abstract
This paper is a review of experimental results obtained by the authors while studying radiation chemistry of alkaline and acid aqueous solutions of neptunium and americium ions. The oxidation of hexavalent neptunium and americium in alkaline solutions up to heptavalent state by ions-radicals O - has been studied. The yields of the formation of neptunium(VII) from γ-radiolysis in the presence of N 2O, K 2S 2O 8, NaBrO have been determined and the mechanism of the process has been proposed. By the pulse radiolysis method with fast spectrophotometrical registration of short-lived species the rate constant of the oxidation of Np(VI) by ion-radical O - has been estimated. The review contains the data on radiolysis of perchloric acid solutions of NpO 2 + and Am 3+ in the presence of N 2O or XeO 3. The pulse radiolysis method has been used for the study of oxidation of Am 3+ up to Am(IV), the disproportionation of Am(IV) and the interaction of Am(IV) with H 2O 2 and HO 2. This mehtod has also been used to obtain ion Am 2+.
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