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 Xe diffusion in α-CsI could be described by:

D (cm2/s) = 3.0 x 10-1 exp[-0.98(eV)/kT]

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