Procedure to optimize the solid angle for the colimation of the nai detector used to measure the flow rate in pipelines. Braz. J. Radiat. Sci. [Internet]. 30 de abril de 2021 [citado 20 de julio de 2025];9(1A). Disponible en: https://www.bjrs.org.br/revista/index.php/REVISTA/article/view/1550