The serial sectioning technique was used to study the diffusion of 45Ca in single crystals which contained about 18ppm of divalent impurities. At temperatures ranging from 260 to 440C, the data could be described by:

D (cm2/s) = 0.27 exp[-1.07(eV)/RT]

The activation energy remained constant over the temperature range; thus indicating the operation of a single diffusion mechanism (probably involving vacancies).

Diffusion of Ca-45 in AgCl. L.Slifkin, G.Brebec: Commission d’Energie Atomique Report CEA-R-3770, 1969