Neutron self-shielding correction in application of k_0-NAA standardization method to determine Mn content in manganese ores

摘要

In this study, it is aimed to investigate neutron self-shielding effect in application of k_0-NAA standardization method to determine Mn contents in manganese ores. Because the neutron self-shielding correction factors are significant factors in application of k_0-NAA method for large samples. To estimate these, several Mn-ore samples and Au monitor were irradiated separately in a 37 GBq ~(241)Am-Be neutron source irradiation unit and then they were measured by using a 78.5% relative efficient HPGe detector. In this study, the sigmoid function approaches for calculation of G_(th) and Ge factors were applied for the right cylinder sample geometry at known elemental compositions in samples, determined by EDXRF technique with a 25 mm~2 Silicon Drift Detector (SDD). The present results indicate that k_0-NAA method is applicable successfully to determine Mn contents in Mn-ore samples providing that G_(th), and Ge factors are estimated accurately even if a low-flux isotopic neutron source is used.