Application of semi-empirical model for the evaluation of radium activity in phosphogypsum used as component of clinker. Brazilian Journal of Radiation Sciences (BJRS), Rio de Janeiro, Brazil, v. 9, n. 1A, 2021. DOI: 10.15392/bjrs.v9i1A.1518. Disponível em: https://www.bjrs.org.br/revista/index.php/REVISTA/article/view/1518. Acesso em: 21 jul. 2025.