Marwan Rasheed Abass. “Measurement of Radon Concentration for Models of Living and Non-Living Things in Samarra and Its Environs ”. Tikrit Journal of Pure Science 20, no. 1 (February 8, 2023): 140–143. Accessed May 18, 2024. https://tjps.tu.edu.iq/index.php/tjps/article/view/1147.