Abstract
The effect of 60Co γ-radiation on aerated and deaerated phosphoric acid solutions of uranium(IV) oxide (UO 2) was studied as a function of temperature, concentration of UO 2, and radiation dose rate. The effect was measured in terms of the radiolytic yield of uranium(VI),Gu VI. For solutions of high initial UO 2 concentration, Gu(VI) is largest for the aerated solutions at 25°; it is lowest for the deaerated solutions at 140°. The Gu(VI) is lower for the solution of low initial UO 2 concentration than for any of the solutions of high initial UO 2 concentration. At the high starting UO 2 concentration, the initial Gu(VI) values are always higher than the succeeding values; this effect is attributed to the depletion of oxygen originally present in the solution. Gamma radiation causes an error in the determination of the stoichiometry of UO 2; the error is a function of the radiation dose. This error can be minimized by excluding oxygen from solutions of UO 2 and by keeping the initial UO 2 concentration as low as possible.
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