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. https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/2807