An investigation was made of the diffusion-controlled release of Ar from neutron-irradiated single crystals which were doped with about 0.05mol%U. The diffusivity at 945C was 5 x 10-8cm2/s, and that at 1000C was 4 x 10-8cm2/s.

F.W.Felix, H.Seelig: Nukleonik, 1967, 9[8], 389-92