Khalaf Hasan KH, Hussien Hatif K, Amer hameed R. Study of the Natural Radioactivity of selected models. JK-Physics [Internet]. 2018 Jun. 10 [cited 2024 May 19];10(01):1-10 A. Available from: https://journal.uokufa.edu.iq/index.php/jkp/article/view/7270