The distribution of intragranular fission gas bubbles in UO2 during irradiation

Abstract A model is presented describing the nucleation and growth of intragranular fission gas bubbles during the irradiation of uranium dioxide. The bubbles are considered to be heterogeneously nucleated in the wake of energetic fission fragments where they grow by collecting gas by atomic diffusion for a length of time controlled by a re-solution process. The model satisfactorily explains the variation of size and concentration of bubbles with temperature as observed by electron microscopy of irradiated material.