Fernandes A dos S, de Souza PS, Oliveira EM, Rangel J de A, Sousa W de O, Lopes RT. Methodology for preparing a reference sample in the air filter matrix. Braz. J. Rad. Sci. [Internet]. 2022 Jun. 13 [cited 2024 Oct. 6];10(2). Available from: https://bjrs.org.br/revista_33014/index.php/REVISTA/article/view/2037