Study the Attenuation Ability of γ-Rays Emitted from Co-60 Radioactive Isotope in PES/CaFe2O4 Composite Shields. cbej [Internet]. 2022 Mar. 27 [cited 2024 Jul. 20];26(108):466-79. Available from: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/5213