Determination of Manganese Content in Some Commercial Manganese Ores in Turkey k_0-NAA Standardization Method Using ~(241)Am-Be Isotopic Neutron Source

摘要

In this study, the k_0-NAA standardization method was applied to determine manganese concentrations in commercial manganese ores that collected different mining sites in Turkey. The samples were grinded, sieved and filled into Teflon tubes with a thickness of 1mm and then irradiated in one irradiation cell of the 37GBq ~(241)Am-Be isotopic neutron source. The activities of the irradiated manganese-ore samples were produced via ~(55)Mn(n,γ)~(56)Mn reaction and were measured by using a n-type coaxial HPGe detector with 78.5% relative efficiency. The peak area analysis of the 846.8 keV (98.85%) and 1810.7 keV (26.9%) gamma-ray lines of ~(56)Mn product radionuclide were performed. Experimental data of the ~(197)Au(n,γ)~(198)Au standard monitor reaction, the neutron flux parameters in the irradiation cell and related nuclear data were used together to determine manganese concentrations in the samples. The manganese contents in five different mining sites were found to be 2.63 ± 0.23(%) for MH (Malatya Hekimhan), 13.78 ± 0.98(%) for EA (Elaz??-Akbo?a), 21.53 ± 1.52(%) for AK (Ankara Kalecik), 34.09 ± 2.38(%) for AB (Adiyaman Besni), 41.36 ± 2.89(%) for AG (Ad?yaman G?lba??). The results indicated that k_0-NAA method with use of an isotopic neutron source can be successfully applied to the analysis of manganese ores.