Abstract
Uranium dioxide samples have been irradiated at 1200 °C to a variety of doses up to 3.2 × 10 25 flssions/m 3. Examination of these samples by transmission electron microscopy has shown that there is a critical dose below which intragranular fission-gas bubbles are not observed to form. Above this critical dose these bubbles are shown to nucleate heterogeneously upon fission-fragment tracks. Irradiation-induced re-solution has been shown to be effective in the removal of gas atoms from within the sintering pores of this material.
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