The diffusion of uranium was measured using radioactive tracers and sectioning techniques. The diffusion in stoichiometric material as a function of temperature was described by:

D(cm2/s) = 8.47 exp[-104000/RT]

at 1505 to 1863C.

H.M.Lee, L.R.Barbett: Journal of Nuclear Materials, 1968, 27[3], 275-84