The diffusion of 85Sr in the graphitic matrix A3-3 was studied in vacuum and in hydrogen at a pressure of 50Pa by using a thin film technique with vapor deposited carrier-free 85Sr as a source. In a vacuum:

D(cm2/s) = 100 exp[-3.14(eV)/kT]

at 1170 to 1870K, while in 50Pa hydrogen

D(cm2/s) = 20 exp[-2.51(eV)/kT]

at 1170 to 1540K.

W.Hensel, E.Hoinkis: Journal of Nuclear Materials, 1991, 184[2], 88-96