An Investigation on the Radiation Hazards Associated with the Use of Abakaliki Pyroclastic from Southeastern Nigeria as Construction Materials. Global Journal of Science Frontier Research, [S. l.], v. 13, n. A2, p. 17–22, 2013. Disponível em: https://www.journalofscience.org/index.php/GJSFR/article/view/746. Acesso em: 6 feb. 2026.