Dr. Farida Selim Department of Physics and Astronomy, Bowling Green State University, Ohio Center for Pure and Applied PhotoSciences, Bowling Green State University, Ohio Abstract Development of advanced materials for next generation of nuclear energy requires full understanding of radiation induced defect formation and propagation in nuclear materials. Positron Annihilation Spectroscopy (PAS), which is based on antimatter physics provides the most sensitive method for probing and characterization of atomic scale defects in matter. In this talk, I will explain the…