Spatially Resolved Positron Annihilation Spectroscopy of Nuclear Fuels

摘要

Positron annihilation spectroscopy (PAS) is a nondestructivernanalytical technique that can be utilized torncharacterize defects in solids, such as vacancies, cavities,rnand dislocation loops at low concentrations. PAS canrndetect these defects within the sub-nanometer range.rnFurthermore, PAS provides an indirect measurement ofrnthe lattice structure. Doppler broadening is a commonlyrnused PAS technique which measures the electronrnmomentum distribution within the specimen.