Positron Annihilation Measurements on Nuclear Reactor Pressure Vessel Steels

Abstract: Positron Annihilation Spectroscopy is a valuable microscopic method to study radiation damage in nuclear reactor pressure vessel steels. At SCKoCEN, a new positron lifetime setup, suited to measure positron lifetimes in irradiated steel, is being constructed. The particularity of this setup is that the prompt count rate originating from the induced 60Co-activity in the steel is highly reduced. Some preliminary results obtained for unirradiated SA-508 steel are discussed. 1