The yield of HNO, as a function of absorbed dose and HNO concentration, from the α-radiolysis of aerated HNO solutions containing plutonium or americium has been investigated. There are significant differences in the yields measured from solutions of the two different radionuclides. For 0.1 mol dm HNO solutions, the radiolytic yield of HNO produced by americium α-decay is below the detection limit, whereas for plutonium α-decay the yield is considerably greater than that found previously for γ-radiolysis. The differences between the solutions of the two radionuclides are a consequence of redox reactions involving plutonium and the products of aqueous HNO radiolysis, in particular HO and HNO and its precursors. This radiation chemical behavior is HNO concentration dependent with the differences between plutonium and americium α-radiolysis decreasing with increasing HNO concentration. This change may be interpreted as a combination of α-radiolysis direct effects and acidity influencing the plutonium oxidation state distribution, which in turn affects the radiation chemistry of the system.
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