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The present study shows that under suitably chosen conditions, the same results of rare gas diffusion coefficients can be obtained in samples which are reactor irradiated to produce a homo-geneous concentration of rare gas, and in samples that are labeled with rare gas by controlled ion bombardment. In the present study, the diffusion of krypton in Rbl and Csl was found to follow the empirical rule of yielding activation enthalpies in the range (1.4±0.2) x 10