Ghafoor, Berun Nasralddin, and Yadgar Hussein Shwan. “Investigation of Shielding of Standard Materials and Glass for Stopping 662 KeV Gamma Ray Penetrations”. Tikrit Journal of Pure Science, vol. 28, no. 2, Apr. 2023, pp. 83-87, doi:10.25130/tjps.v28i2.1274.