Determination of the activity concentration of 226Ra, 232Th, 40K and the concentration of 222Rn in soil samples of the Campos Gerais region (Paraná). Brazilian Journal of Radiation Sciences, Rio de Janeiro, Brazil, v. 9, n. 1A, 2021. DOI: 10.15392/bjrs.v9i1A.1240. Disponível em: https://www.bjrs.org.br/revista/index.php/REVISTA/article/view/1240.. Acesso em: 15 may. 2024.