Baria, Rogerio, S Watanabe, C S Munita, P C S Silva, and Sonia Tatumi. “Levels of Thorium, Uranium and Potassium in Brazilian Geological Sediment Determined by Gamma-Ray Spec-Troscopy and Instrumental Neutron Activation Analysis”. Brazilian Journal of Radiation Sciences 10, no. 3B (Suppl.) (January 4, 2023). Accessed October 6, 2024. https://bjrs.org.br/revista_33014/index.php/REVISTA/article/view/1984.