The diffusion of T in austenitic stainless steel, at temperatures above 373K, was found to be closely described by the equation:

D (cm2/s) = (4.7 x 10-3) m-½ exp[-12900/RT]

where m was the isotopic mass. Diffusion below 373K was greater than predicted by this equation, due to short-circuit and grain-boundary diffusion. Cold work, before or during exposure, significantly increased diffusion. Cold-working before exposure caused short-circuit diffusion through strain-induced martensite, while deformation during exposure led to enhanced transport by moving dislocations. Permeation through sheets was limited by surface absorption and was much less rapid than was predicted by the diffusion step alone. The solubilities were always lower than expected and were greatly dependent upon the surface conditions.

M.R.Louthan, J.A.Donovan, G.R.Caskey: Nuclear Technology, 1975, 26[2], 192-200