N. Al-Shammary, Rawaa. “A Simple Mathematical Model to Calculate Dose Distribution of the Co-60 Beam”. Rafidain Journal of Science 19, no. 5 (October 1, 2008): 69–77. Accessed September 28, 2025. https://jamh.uomosul.edu.iq/index.php/rsci/article/view/46763.