Effect of CaF2 on the radiation attenuation properties of SiO2–P2O5–CaO–Na2O bioactive glasses: Theoretical and simulation studies oleh Norah Alomayrah, Mubarak M. Albarqi, Raed A. Alsulami, Z.A. Alrowaili, Canel Eke, Imen Kebaili, I.O. Olarinoye, Sultan J. Alsufyani, M.S. Al-Buriahi