Exploring the radiation shielding efficiency of low-impact Portland cement pastes made with barium sulfate, silica fume and fly ash. Braz. J. Radiat. Sci. [Internet]. 10 de enero de 2025 [citado 17 de julio de 2025];13(1):e2777. Disponible en: https://bjrs.org.br/revista/index.php/REVISTA/article/view/2777