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 Indoor radon levels in primary and secondary schools of Kastamonu, Turkey(Scibulcom, 2015-01-01) Yalçın, S.; Aras, G.; Tarım, Ürkiye Akar; Gürler, Orhan; AKAR TARIM, ÜRKİYE; GÜRLER, ORHAN; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; AAH-4270-2021; AAH-1837-2021In this study, indoor air radon concentrations in the primary and secondary school buildings in the province of Kastamonu in Turkey were measured using AlphaGUARD PQ2000 PRO radon detector. The goal of this survey was to assess the radon concentration in the schools of this city. The research was focused on the age of the buildings and building materials affecting radon concentration levels. The results were not conclusive, activities were measured in the range of 11.87 +/- 5.53 to 58.98 +/- 19.77 Bq m(-3). This range is well below the recommended reference levels for houses and workplaces.Publication A possibility for standoff bomb detection(Elsevier, 2015-01-01) Tarım, Urkiye Akar; Özmutlu, Emine N.; Gürler, Orhan; Yalçın, Sezai; AKAR TARIM, ÜRKİYE; Özmutlu, Emine N.; GÜRLER, ORHAN; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; 0000-0001-6779-9230; AAH-4270-2021; AAH-1837-2021; FPR-2739-2022The response functions of backscattered photons, which are initially collimated with an energy of 662 key, were obtained by a Monte Carlo method in an NaI(TI) scintillation detector using a suitcase or briefcase full of paper, clothing, ammonium nitrate or other generic explosives, as these can be used for terrorism. The results show that characteristic response functions for ammonium nitrate and generic explosives may be found, and using this information, standoff detection of these materials may be possible.Publication Synergizing electrical, mechanical, and radiation shielding properties of dendritic copper filled epoxy polymer composites(Pergamon-elsevier Science Ltd, 2023-11-18) Mutlu, Derya; Karagöz, İdris; Sepetçioğlu, Harun; Tarım, Urkiye Akar; AKAR TARIM, ÜRKİYE; Gürler, Orhan; GÜRLER, ORHAN; Bursa Uludağ Üniversitesi/Fen Edebiyat Fakültesi/Psikoloji Anabilim Dalı.; AAX-9870-2021The study examined the properties of epoxy composites with dendritic copper (Cu) particles through various tests, including FTIR, DSC, TGA, electrical conductivity, and mechanical tests. The addition of Cu particles to the composites improved their electrical conductivity and mechanical properties, particularly tensile strength and flexural modulus. The Tg temperature of the composites could be adjusted by varying the Cu particle ratio. Notably, in the study, we prepared composites with varying Cu particle concentrations, specifically at ratios of 1%, 2%, 3%, 4%, 5%, and 6%, and observed distinct effects on the properties of the epoxy-Cu composites. Although there was no chemical bonding between the epoxy and Cu particles, the Cu additive acted as a pinning agent, restricting the movement of the polymer chains. This suggests that incorporating small amounts of Cu into epoxy composites can enhance their properties, making them suitable for applications in the electrical and electronics industry. Additionally, we evaluated the shielding properties of selected epoxy-based composites incorporating copper powder against gamma radiation with energies of 59.5 keV, 661.6 keV, and 1332.5 keV, and also investigated the composites' ability to attenuate gamma rays, recommending specific composites (ECU6, ECU1, and ECU2) for different energy levels of gamma rays. SEM examinations showed that the addition of Cu particles significantly altered the microstructure and mechanical properties of the composites, resulting in an irregular and rough fracture surface and decreased structural integrity.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.Publication Potential use of concretes for gamma-ray shielding(Parlar Scientific Publications (P S P), 2019-01-01) Gürler, Orhan; GÜRLER, ORHAN; Tarım, Urkiye Akar; AKAR TARIM, ÜRKİYE; Bursa Uludağ Üniversitesi/Fen Edebiyat Fakültesi/Fizik Bölümü.; AAH-4270-2021; AAH-1837-2021In this study, eleven concrete samples produced in a variety of compositions were irradiated by Na-22, Cs-137 and Co-60 radioactive sources and the measurements of transmitted gamma-rays with the energies of 511, 661.6, 1173.2, 1274.5, 1332.5 keV have been carried out by using a gamma-ray scintillation spectrometer includes a NaI(Tl) scintillation detector and multichannel analyzer (MCA) card. Results of these measurements were then used to determine linear attenuation coefficient (mu), mass attenuation coefficient (mu(m)), half-value layer (HVL) and tenth-value layer (TVL) to estimate the effectiveness of each sample on radiation shielding. The results are explained in the view of the concrete composition and its impact on the gamma-ray interaction probability at different energies. In addition, mass and linear attenuation coefficients that are the most important parameters for estimation of shielding properties of samples are compared with other previously published data for concrete samples from several regions.