Mohammed, Layth, لیث, Ali Hussain, علی, and أحمد. “Universal Empirical Relationship Between Efficiency of Scintillation Detector NaI(Tl) With Gamma Ray Energy and Distance Using Gamma Spectroscopy (UCS-20)”. Journal of Education and Science (JES) 21, no. 3 (September 1, 2008): 138–152. Accessed August 4, 2025. https://rjps.uomosul.edu.iq/index.php/edusj/article/view/17529.