The diffusion of 60Co in 4N5-purity material was studied at 400 to 640C. The results could be described by:

D (cm2/s) = 2.5 x 102 exp[-1.81(eV)/kT]

M.S.Anand, R.P.Agarwala: Philosophical Magazine, 1972, 26[2], 297-309