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Exploring the radiation shielding efficiency of low-impact Portland cement pastes made with barium sulfate, silica fume and fly ash. Braz. J. Rad. Sci. [Internet]. 2025 Jan. 10 [cited 2025 May 2];13(1):e2777. Available from: https://www.bjrs.org.br/revista/index.php/REVISTA/article/view/2777