Levels of thorium, uranium and potassium in Brazilian geological sediment determined by gamma-ray spec-troscopy and instrumental neutron activation analysis. Braz. J. Radiat. Sci. [Internet]. 4 de enero de 2023 [citado 17 de julio de 2025];10(3B (Suppl.). Disponible en: https://bjrs.org.br/revista/index.php/REVISTA/article/view/1984