Al-Zahrani, J., & El-Taher, A. (2017). Natural Radioactivity levels and Elemental Analysis of Cement by Gamma-Ray Spectrometer and Neutron Activation Analysis. American Scientific Research Journal for Engineering, Technology, and Sciences, 30(1), 173–183. Retrieved from https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/2807