Person: GÜRLER, ORHAN
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GÜRLER
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ORHAN
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Publication Gamma-ray attenuation study for the soils of Bursa, Turkey, in the energy range 59.5-1332.5 keV(Springer, 2020-06-08) Gürler, Orhan; Tümsavaş, Zeynal; Tarım, Urkiye Akar; GÜRLER, ORHAN; TÜMSAVAŞ, ZEYNAL; AKAR TARIM, ÜRKİYE; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Toprak Bilimi ve Bitki Besleme Bölümü.; AAH-1837-2021; AAH-4270-2021; JKS-0298-2023In this study, the gamma radiation attenuation was experimentally investigated for soil samples with different texture collected from Bursa Province, Turkey. Firstly, physical and chemical properties (e.g., density, particle size distribution, lime content, organic matter and chemical composition) of these soils were determined by several methods. The transmission measurements of soils performed by using Am-241, Cs-137, Co-60 and Na-22 sources and 2 x 2 inch NaI(Tl) scintillation detector were used to calculate shielding parameters, mass attenuation coefficient, half value layer and tenth value layer values, of these samples in form of pressed powder pellets. The values of these important parameters have been found to vary with gamma-ray energy and chemical composition of the studied soil samples. For instance, the mass attenuation coefficients were decreased with increasing gamma-ray energies and, with the increase in contribution of MgO and Na components, caused better absorption. The effect of compression pressure on attenuation coefficient was also investigated, and better absorption was observed for the sample pressed by high value of press force.Publication A computational modelling of low-energy gamma ray detection efficiency of a cylindrical NaI(Tl) detector(Pergamon-Elsevier Science, 2021-11) Ahmadi, S.; Ashrafi, S.; Yazdansetad, F.; Roshanshah, N.; Tarım, Ürkiye Akar; Gürler, Orhan; GÜRLER, ORHAN; AKAR TARIM, ÜRKİYE; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; AAH-4270-2021; AAH-1837-2021Measurements show the detection efficiency of the NaI(Tl) detector depends on the source-detector configuration. In this work, the geometrical and intrinsic detection efficiencies of the 2in both in height and diameter and 3in both in height and diameter cylindrical NaI(Tl) detectors have been calculated for low-energy gamma ray. In these calculations, the effects of cover layers of NaI(Tl) (aluminum housing and reflector) have been taken into consideration. To evaluate the calculation model, the detection efficiency of the detector is measured and modelled using MCNP simulation tool. Isotropic 241Am was used as a point source. Results show the calculation model is in good agreement with the experiment and Monte Carlo simulation.Publication Screening parameter for elastic scattering of electrons(Taylor & Francis, 2021-08-30) Yalçın, Sezai; Tarım, Urkiye Akar; Gürler, Orhan; Gündoğdu, Özcan; Bradley, D. A.; AKAR TARIM, ÜRKİYE; GÜRLER, ORHAN; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; 0000-0002-5494-5128; 0000-0002-8463-3432; AAH-4270-2021; AAH-1837-2021The present work, with its interest focusing on the elastic scattering of energetic electrons, provides a novel formulation that is demonstrated to give accurate values of the screening parameter. This is a matter considered vital in obtaining transport cross-sections, the work herein covering not only a wide range of electron energies popular in applications (1-3000 keV) but also a comprehensively wide range of target atomic numbers (Z: 1-94). Such ability has hitherto not been commonly available in making use of existing formulations. Results from the proposed formula together with comparisons made against previously published results are presented for seventeen representative elements, covering the energy range 1 keV to 3 MeV, providing a representative condensation from the 94 elements for which we have made comparable calculations. The new formulation is seen to offer a viable and accurate approximation, being both simple to apply and devoid of limitations within the bracketed electron energy and target atomic number ranges.