Tracer techniques were used to study 204Tl diffusion. It was found that the data could be described by:

D(cm2/s) = 9.1 x 10-7exp[-0.8(eV)/kT]

between 550 and 700C.

L.P.Firsova, G.P.Simirskaya: Inorganic Materials, 1987, 23[6], 817-20