Mahmoud A. Elawi. “Mass Attenuation Coefficient Measurements of Photoelectric Absorption of Gamma-Rays in Copper Using Coincidence Technique”. Tikrit Journal of Pure Science 25, no. 4 (August 2, 2020): 80–85. Accessed July 3, 2024. https://tjps.tu.edu.iq/index.php/tjps/article/view/275.