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AKKAYA, GİZEM

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AKKAYA

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GİZEM

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2019 - 201912020 - 20212
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    Publication
    Estimation of radiological exposure levels in a mining area based on ²³⁸U, ²²⁶Ra, ²³²Th and ⁴⁰K activity measurements: A case study for Beylikova-Sivrihisar complex ore site in Turkey (vol 190, pg 297, 2020)
    (Oxford Univ Press, 2021-02-22) Yücel, Haluk; Ovuç, Süleyman; Akkaya, Gizem; Çakmak, Sadiye; AKKAYA, GİZEM; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; AAH-8784-2021
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    The calculation of self-shielding correction factors for large samples in ²⁴¹Am-Be isotopic neutron source
    (Pergamon-Elsevier, 2021-10-19) Akkaya, Gizem; AKKAYA, GİZEM; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; AAH-8784-2021
    In the present study, it is aimed to calculate neutron self-shielding correction factors for cylinder sample geometry using different methods in the literature in the application of k(0)-NAA standardization method with Am-241-Be isotopic neutron source. These correction factors are important in calculating the accurate concentration values for large samples with a high neutron absorption cross-section in the application of the k(0)-NAA method. In order to see the validity of the applied theoretical and experimental methods, the obtained concentration values are given comparatively with respect to the known Mn concentrations. The mean concentration difference ranges from-3.4% to-9.7%. The thermal neutron self-shielding correction depends on all elements in the sample that absorb thermal neutrons. In k(0)-NAA applications with large samples, although timeconsuming, it is recommended to use the experimental methods after calculating the necessary parameters with the help of samples with known composition.
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    Determination of manganese content in some commercial manganese ores in Turkey k0-NAA standardization method using 241Am-Be isotopic neutron
    (Amer, 2019-01-01) Akkaya, Gizem; Yücel, Haluk; Budak, Mustafa Güray; Mishonov, TM; Varonov, AM; AKKAYA, GİZEM; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; Mishonov, TM; Varonov, AM; AAH-8784-2021
    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 M-241-Be isotopic neutron source. The activities of the irradiated manganese-ore samples were produced via Mn-55(n,gamma) Mn-56 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 Au-197(n,gamma) Au-198 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 (Elazig-Akboga), 21.53 +/- 1.52(%) for AK (Ankara Kalecik), 34.09 +/- 2.38(%) for AB (Adiyaman Besni), 41.36 +/- 2.89(%) for AG (Adiyaman Golbasi). 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.