Measurements were made of 210Pb using a vapor source diffusion technique. These measurements yielded significantly lower values of the diffusion coefficients than those previously reported. For selenium-saturated material,

D(cm2/s) = 9.81 x 10-4exp[-1.67(eV)/kT]

while, for lead-saturated material,

D(cm2/s) = 3.74 x 10-2exp[-2.05(eV)/kT]

An analysis of the results indicated that Pb atoms diffused through Pb vacancies in Se-rich material and most probably through Pb interstitials in Pb-rich material.

R.L.Guldi, J.N.Walpole, R.H.Rediker: Journal of Applied Physics, 1973, 44[11], 4896-907