TEMPERATURE AND CONCENTRATION-DEPENDENCE OF TRITIUM RELEASE BEHAVIOR FROM SOLIDIFIED LIF-PBF2 PELLET IRRADIATED BY THERMAL-NEUTRON

Thin pellets of the LiF-PbF//2 system with no porosity were irradiated by thermal neutron. Then release experiment of tritium produced in the pellets was carried out at some constant temperatures. Thus diffusion coefficients of tritium in the LiF-PbF//2 system were estimated to obtain an activation energy of diffusion, which was found to be 0. 51 ev at LiF mole fraction of 0. 467. It was also observed that decrease of LiF concentration in the pellet brings increase of diffusion coefficient of tritium.