“DETERMINATION OF FREE RADICALS CONCENTRATION IN -IRRADIATED POLYMETHYLMETHACRYLATE USING POSITRON ANNIHILATION LIFETIME SPECTROSCOPY”. Iraqi Journal of Science 51, no. 1 (September 6, 2024): 98–106. Accessed August 13, 2025. https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/13782.