Tracer-diffusion measurements were made of 45Ca and 22Na co-diffusion into pure NaCl. The diffusivity of 45Ca, at 575 to 775C, could be described by:

D (cm2/s) = 2.3 x 10-1 exp[-1.61(eV)/kT]

J.L.Mitchell, D.Lazarus: Physical Review B, 1975, 12[2], 734-52