A serial sectioning technique was used to study the diffusion of 131I in material which contained about 5ppm of impurities. The I diffusion required the same activation energy as that for Cl diffusion. The data for 307 to 448C could be described by:

D (cm2/s) = 1.67 x 102 exp[-36.2(kcal/mol)/RT]

A.P.Batra, L.Slifkin: Journal of the Physics and Chemistry of Solids, 1969, 30[6], 1315-20

The best linear fit to the solute diffusion data ([348] to [365]) yields:

Mn: Ln[Do] = 0.87E – 22.7 (R2 = 0.99)