Abstract
Migration of fission gas bubbles in irradiated UO 2 was studied, using electron microscopy, under isothermal annealing conditions at 1400, 1450 and 1500° C. Bubbles with radii greater than 37 Å had a dependence of bubble migration distance on bubble radius which was characteristic of a migration mechanism controlled by volume diffusion. Migration rates were very much smaller than would be predicted from a surface-diffusion-controlled mechanism. The activation energy for bubble migration was found to be 130 000 cal/mole. Smaller bubbles migrated at a slower rate than predicted by a volume-diffusion-controlled mechanism.
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