Portable grazing exit X-ray fluorescence system using a low-power X-ray tube. Brazilian Journal of Radiation Sciences, Rio de Janeiro, Brazil, v. 7, n. 2A (Suppl.), 2019. DOI: 10.15392/bjrs.v7i2A.714. Disponível em: https://bjrs.org.br/revista/index.php/REVISTA/article/view/714. Acesso em: 1 jun. 2025.