Determination of the activity concentration of 226Ra, 232Th, 40K and the concentration of 222Rn in soil samples of the Campos Gerais region (Paraná). Braz. J. Rad. Sci. [Internet]. 2021 Apr. 30 [cited 2024 May 15];9(1A). Available from: https://www.bjrs.org.br/revista/index.php/REVISTA/article/view/1240