STUDY OF COMPOSITION OF BISMUTH OXIDE, CEMENT AND SAND AS X-RAY RADIATION SHIELDING MATERIALS. The Journals of the Nigerian Association of Mathematical Physics, [S. l.], v. 72, p. 1–10, 2026. DOI: 10.60787/jnamp.vol72no.656. Disponível em: https://nampjournals.org.ng/index.php/home/article/view/656.. Acesso em: 23 jun. 2026.