A study was made of isothermal gas release from single crystals which had been irradiated to a neutron dose (E = 10keV) of 5.8 x 1015/cm2. The data for Ar diffusion in α- Cs0.99K0.1I could be described by:

D (cm2/s) = 0.6 exp[-0.98(eV)/kT]

F.W.Felix, K.Meier: Physica Status Solidi, 1969, 32[2], K139-42