AP01015 Extracting the Free Volume and Hole Fraction of Based Polymers under Positron Annihilation Lifetime Spectroscopy Technique. Iraqi Journal of Applied Physics, [S. l.], v. 21, n. 4, p. 503–507, 2025. DOI: 10.2025/sacjhr73. Disponível em: http://ijap-iq.com/index.php/ijap/article/view/430. Acesso em: 1 may. 2026.