Abstract
The thermal release behavior of tritium produced in a sintered Li 2O pellet (76.5% TD) has been investigated with a radiometric method. When the neutron-irradiated pellet was heated under vacuum, more than 95% of the tritium was released in the chemical form of HTO. In the HTO release process, diffusion of tritium (T +) in grains of the pellet was revealed to be a principal rate-determining step, although contribution of HTO diffusion through the grain boundary was also suggested. The Arrhenius relation of the overall diffusion coefficient determined in the temperature range from 570 to 680 K was D = 40.7 exp(− 154.1 × 10 3/ RT) cm 2 s −1, where probable errors are ± 8.7 kJ mol −1 for the activation energy and ± 0.77 for the logarithmic pre-exponential term.
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