Relative reactivities of radioiodine released from U3O8 in oxygen and helium atmospheres toward propane.

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Chemical form of radioiodine released from U3O8 will be UIx, in helium and I2 in oxygen atmospheres. Relative reactivities of these iodines toward organic compounds have been studied at a temperature range of 250500°C, by choosing propane as a reactant. The UIx, has a higher reactivity than I2, particularly at a temperature range of 300400°C. Above that temperature, both iodine species show a similar reactivity. In the reactions, CH3I, C2H5I, i- and n-C3H7I are formed : relative yields depend on both temperature and atmosphere. Two reaction processes participate in the formation of organic iodides. One is an iodine-initiation reaction and is relatively important at a lower temperature. The other is a radical-initiation reaction and become predominant as the temperature rises.
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