Abstract
The effect of γ radiation on plutonium(III) was studied in argon and oxygen equilibrated hydrochloric acid solutions. The initial G values of Pu(IV) and H 2O 2 were found to be 6.5±0.6 and 4.0±0.4 respectively in oxygen equilibrated 0.8 mol dm -3 HCl solutions. While the G[Pu(IV)] increased to 8.0±0.8 in 9.0 mol dm -3 HCl solutions. G(H 2O 2) decreased to 2.5±0.3. In argon equilibrated 0.8 mol dm -3 HCl solutions, the G values of Pu(IV) and H 2O 2 were 5.0±0.4 and 0.6±0.1 respectively. It was observed that the initial yields of Pu(IV) decreased beyond a dose of 6 × 10 18 eV cm -3 and there was incomplete oxidation of Pu(III) in 0.8 ml dm -3 HCl in both oxygen and argon equilibrated solutions, whereas Pu(III) in 9.0 mol dm -3 HCl was completely oxidised to plutonium(IV) in oxygen equilibrated solutions. The observed radiolytic yields of Pu(IV) and H 2O 2 are discussed in terms of reactions of Pu(III) with radiolytic products of water. Formation of brown peroxy complex was observed in oxygen equilibrated solutions of Pu(III) in 0.8 mol dm -3 HCl.
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