A surface counting technique was used to investigate 137Cs tracer diffusivity in pure single crystals. The data for 250 to 500C could be described by:

D (cm2/s) = 2.25 x 102 exp[-1.74(eV)/kT]

I.M.Hoodless, B.D.McNicol: Philosophical Magazine, 1968, 17, 1223-31

The best linear fits to the solute diffusion data ([407] to [411], [418] to [422]) yield:

Cs: Ln[Do] = 0.60E – 18.3 (R2 = 0.995); Xe: Ln[Do] = 0.32E – 7.8 (R2 = 0.70)