DETERMINATION OF FREE RADICALS CONCENTRATION IN -IRRADIATED POLYMETHYLMETHACRYLATE USING POSITRON ANNIHILATION LIFETIME SPECTROSCOPY. Iraqi Journal of Science, [S. l.], v. 51, n. 1, p. 98–106, 2024. DOI: 10.24996/ijs.2010.51.1.%g. Disponível em: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/13782.. Acesso em: 10 sep. 2024.