Yazar "Tekin, H.O." seçeneğine göre listele

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    Advancing mechanical durability and radiation shielding properties in Silicon dioxide (SiO2) glasses through various incorporations: A comparative analysis
    (Elsevier B.V., 2024) AlMisned, G.; Sen, Baykal, D.; Alkarrani, H.; Susoy, G.; Tekin, H.O.
    Silicon dioxide (SiO2) glasses, known for their high thermal stability, excellent optical transparency, and substantial mechanical strength, are crucial in numerous technological applications, including radiation shielding. This research explores the impact of compositional variations in SiO2-based glasses on their mechanical and radiation shielding properties, particularly focusing on the inclusion of heavy metal oxides (HMO) and rare earth elements (REE) like neodymium (Nd). Through the systematic investigation of fifteen distinct glass samples with varying concentrations of specific oxides and elements, we investigate the compositional changes and their influence on physical properties and their effectiveness in attenuating radiation. Our findings demonstrate that the incorporation of Nd significantly enhances the glass's radiation shielding capabilities. Glasses doped with Nd exhibited higher effective atomic numbers and electron densities, which translate to superior attenuation characteristics at lower photon energies. This is highlighted by the exceptional performance of the 20Nd sample, showing the lowest exposure build-up factors (EBF) at 10 mean free paths (mfp), indicating its potential as a premier candidate for shielding applications against various energy levels of radiation. Moreover, the variation in the Elastic Modulus of the glass samples underscores the significant impact of the glass matrix composition on its mechanical properties, suggesting a delicate balance between network formers and modifiers in determining the glass properties. It can be concluded that the neodymium-doped SiO2-based glasses may be considered as targeted compositions in fine-tuning material properties to meet specific application requirements. As the demand for efficient radiation shielding materials grows across medical, industrial, and space exploration sectors, our findings provide a solid foundation for the development of new glass formulations tailored for enhanced mechanical properties and superior radiation protection levels. © 2024 The Author(s)
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    Assessment of Gamma Ray Shielding Properties for Skin
    (Prof.Dr. İskender AKKURT, 2023) Malidarre, R.B.; Tekin, H.O.; Gunoglu, K.; Akyildirim, H.
    Gamma ray is uncharged radiation type and having high energy it can ionize any atom and thus can damage human cells. Because of this harmful effect cell should be protected. Besides developing new alternative to lead and lead based materials, it should be interesting to obtain shielding properties of skin. This paper presents a results on the shielding properties of skin. © IJCESEN.
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    An assessment of microstructure, dentinal tubule occlusion and X-ray attenuation properties of Nd:YAG laser-enhanced titanium-doped phosphate glass and nano-hydroxyapatite pastes
    (Springer Science and Business Media Deutschland GmbH, 2024) Neel, E.A.A.; Aldamanhoury, H.M.; Hossain, K.M.Z.; Alawadhi, H.; ALMisned, G.; Tekin, H.O.
    This research evaluated the dentinal tubule occlusion capabilities of titanium dioxide-doped phosphate glass (TDPG) paste, with and without adjunctive Nd:YAG laser treatment in comparison to nanohydroxyapatite (n-HA) that also contains calcium phosphate. In total, forty etched dentin (ED) discs were allocated into eight groups: untreated ED (G1), laser-treated ED (G2), TDPG paste-applied ED (G3), TDPG paste followed by laser (G4), TDPG microspheres paste-applied ED (G5), microspheres paste followed by laser (G6), n-HA paste-applied ED (G7), and n-HA paste followed by laser (G8). The interventions were assessed using scanning electron microscopy (SEM) for morphological changes, counting opened dentinal tubules and elemental analysis. Additionally, the study incorporated an evaluation of radiological properties, specifically the materials' mass attenuation coefficients, effective atomic numbers, and exposure buildup factors, to ascertain their compatibility with X-ray imaging modalities. Findings indicated that paste application alone created a layer of precipitated crystals, effectively occluding dentinal tubules. Subsequent laser treatment enhanced occlusion by reducing opened dentinal tubules by approximately 50%, created a dense layer of altered TDPG or n-HA crystals with modified phosphorus and calcium composition. The inclusion of radiological assessment suggested that these materials, particularly when combined with laser, have potential not only for treating dentin hypersensitivity but also compatible with radiographic diagnostic processes. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.
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    Correction to: An assessment of microstructure, dentinal tubule occlusion and X-ray attenuation properties of Nd:YAG laser-enhanced titanium-doped phosphate glass and nano-hydroxyapatite pastes (Applied Physics A, (2024), 130, 5, (313), 10.1007/s00339-024-07487-7)
    (Springer Science and Business Media Deutschland GmbH, 2024) Abou, Neel, E.A.; El-Damanhoury, H.M.; Zakir, Hossain, K.M.; Alawadhi, H.; ALMisned, G.; Tekin, H.O.
    In this article the author’s name Hatem M. El-Damanhoury was incorrectly written as Hatem M. Aldamanhoury. The original article has been corrected. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.
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    Enhancing radiation shielding transmission factors and mechanical Robustness of borosilicate glasses through Bi2O3 modification: A comprehensive study
    (Elsevier Ltd, 2024) Almousa, N.; Issa, S.A.M.; Tekin, H.O.; Rammah, Y.S.; Mostafa, A.M.A.; Sen, Baykal, D.; Alshammari K.
    The mechanical behavior and gamma radiation attenuation features of borosilicate glasses with chemical compositions 16ZnO–8BaO-5.5SiO2-0.5Sb2O3-(70-x)B2O3/xBi2O3 are extensively investigated. Makishima-Mackenzie principle, Monte Carlo code, and Phy-X/PSD software are utilized in terms of determining these properties. Our results showed that the total packing density (Vt) decreased from 0.634851 to 0.571458, while the total dissociation energy increased from 26.612 (kJ/cm3) to 29.652 (kJ/cm3) for S1-glass (with 10 mol% of Bi2O3) and S5-glass (with 30 mol% Bi2O3). All elastic moduli are enhanced by increasing the Bi2O3 additive in the investigated glasses. Poisson's ratio was decreased from 0.281226 for S1-glass to 0.256957 for S5-glass. In terms of gamma-ray shielding parameters; linear (?) and mass attenuation (?m) coefficients for the rich glass sample with B2O3 (S5) possess the highest values among all investigated (S1–S5) samples. The glass sample S5 is reported with the lowest values of tenth (TVL) and half (HVL) value layers among all studied glasses. In addition, the exposure (EBF) and energy absorption (EABF) bulidup factors were decreased with increasing the amount of Bi2O3 reinforcement for mean free path values from 0.5 to 40 mfp. The lowest possible levels of attenuation (minimum transmission) were measured at a thickness of 3 cm for all of the glass samples. © 2024 Elsevier Ltd
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    An extensive benchmark analysis of advanced ceramic-concretes towards strategic material selection for nuclear applications and waste management
    (Elsevier Ltd, 2024) AlMisned, G.; Susoy, G.; Sen, Baykal, D.; Kilic, G.; Tekin, H.O.
    Ceramic concretes, with their exceptional durability and ability to incorporate a high percentage of heavy metal oxides, are of critical importance for nuclear radiation facilities, offering superior radiation attenuation characteristics essential for long-term safety and protection. This study presents a detailed evaluation of the gamma-ray shielding properties of various concrete composites, including Standard Concrete and Heavy Concretes (HC series), with densities ranging from 1.94 g/cm3 to 4.54 g/cm3. Utilizing computational methods, we analyzed several gamma-ray and neutron shielding parameters such as mass attenuation coefficients, linear attenuation coefficients, half and tenth value layers, mean free paths, exposure build-up factors, effective atomic number (Zeff), effective electron density (Neff), fast neutron effective removal cross-section (?R), and photon transmission factors (TFs). Our research reveals that the shielding efficacy of concrete is intrinsically linked to its density and elemental composition, with higher densities and the incorporation of heavy elements leading to enhanced attenuation capabilities. Among the concretes studied, Limonite with Steel Punch LS-a, which contains 74.53% Fe in its structure, exhibited the lowest transmission factors (TFs) across all tested thicknesses and energy levels (0.662, 1.1732, and 1.3325 MeV), indicating its superior photon attenuation potential. It can be concluded that the concrete samples with a higher Fe (iron) content in their structure demonstrate clear superiority in gamma-ray attenuation properties. © 2024 Elsevier Ltd and Techna Group S.r.l.
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    Titanium alloys: A closer-look at mechanical, gamma-ray, neutron, and transmission properties of different grade alloys through MCNPcode application
    (Korean Nuclear Society, 2024) ALMisned, G.; Guler, O.; Sen, Baykal, D.; Kilic, G.; Tekin, H.O.
    Titanium alloys play a vital role in optimizing the effectiveness and security of nuclear reactors, strengthening structural durability, and facilitating the effective handling of nuclear waste. The aim of this study is to investigate the gamma-ray, neutron, and transmission properties of four common titanium alloys through the examination of the deposited energy amount in the liquid sodium coolant material, in relation to the mechanical properties of these alloys. MCNP (version 6.3) is utilized for designing the titanium pipes. Next, the pipes were re-designed considering the elemental mass fractions and densities of the investigated titanium alloys. Grade 26 sample is reported with the highest values of mass attenuation coefficients and the lowest HVL values among those investigated alloys. Grade 26 is reported to have the lowest TF value, whereas Grade 12 demonstrated the highest TF value. The highest Effective Removal Cross Section (?R, 1/cm) value against fast neutrons is reported for Grade 26. The utilization of Grade 26 sample as pipe material resulted in the lowest deposited energy amount (MeV/g) and subsequent lowest contamination in the coolant material. Out of the alloys that were chosen for analysis, it has been determined that Grade 26 exhibits the highest level of strength. It can be concluded that the Grade 26 alloy exhibits desirable characteristics for applications in nuclear technologies that require superior gamma-ray and neutron absorption properties, as well as exceptional mechanical properties. Nevertheless, it is essential to emphasize the importance for ongoing studies to enhance the existing material properties of Grade 26, with the aim of achieving improved safety and efficacy in nuclear applications. © 2024 Korean Nuclear Society