Xenon-133 was injected into CaF2 single-crystals by fission recoil, and rare gas diffusion measurements were carried out at 750 to 1000C for 3 gas concentrations. Classical diffusion results were obtained at low gas concentrations with the values of given by:

D(cm2/s) = 9.50 x 106 exp[-4.42(eV)/kT]

A.S.Ong, T.S.Elleman: Journal of Nuclear Materials, 1972, 42[2], 191-202