Abstract
The effect of temperature on the rate of release of tritium from neutron-irradiated polycrystalline and single-crystal UO 2 has been studied. The diffusion coefficients for tritium from 500–1000°C are found to be several orders of magnitude lower than those reported for molecular hydrogen in UO 2 single crystals. Fractional release curves are indicative of classical diffusion and the Arrhenius plots for both polycrystalline and single crystal materials can be fitted by the diffusion equation: D = 0.12 (+0.21 − 0.07) × exp(−43600 ± 1800 cal/ RT) cm 2/s.
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