Nisti, M.B., Máduar, M.F., Saueia, C.H.R., Cavalcante, F. and Mazzilli, B.P. 2020. Optimization of the gamma-ray spectrometry counting time based on uncertainties of radionuclides concentration in samples. Brazilian Journal of Radiation Sciences. 8, 2 (Jun. 2020). DOI:https://doi.org/10.15392/bjrs.v8i2.1197.