An investigation was made of the diffusion of T, into stainless steel tubes, by using sectioning and liquid scintillation or bremsstrahlung counting techniques. At temperatures ranging from 100 to 300C, the data fitted:

D (cm2/s) = 1.24 x 10-2 exp[-13.6(kcal/mol)/RT]

K.F.Chaney, G.W.Powell: Metallurgical Transactions, 1970, 1[8], 2356-7