Abstract
Specimens of stainless steel reactor internals were irradiated with 240keV protons and 6MeV Xe ions up to 15dpa. The positron annihilation lifetime spectroscopy (PLS) was carried out to study the development of vacancy-type defects. It is indicated that positrons are trapped by vacancies, vacancy clusters and other defects (precipitate, dislocations). The short lifetime parameter τ1 decreases when specimens are irradiated to 2dpa by proton, whereas in the case of Xe irradiation, τ1 decreases when specimens are irradiated to 7dpa. The positron annihilation at small cluster with H atoms (for H irradiation) and precipitated phase (for Xe irradiation) may explain this transition. The long lifetime parameter τ2 increases continuously with damage increase. Compared with Xe irradiated specimens, a larger τ2 is obtained in proton irradiated specimens at the same damage. The gas atoms-vacancies, which are expected to be the early state of H bubbles, will develop into small bubbles with the increase of irradiation damage and thus cause long lifetime parameter increase.
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