Vaitiekūnas, Petras, and Daiva Lukošiūte. “Study of Gamma Radiation from Building Materials”. Journal of Environmental Engineering and Landscape Management 13, no. 4 (December 31, 2005): 182-186. Accessed May 4, 2024. https://journals.vilniustech.lt/index.php/JEELM/article/view/8060.