Browsing by Author "Issa S.A.M."

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    WS2/bioactive glass composites: Fabrication, structural, mechanical and radiation attenuation properties
    (Elsevier Ltd, 2021) Deliormanlı A.M.; Ensoylu M.; Issa S.A.M.; Elshami W.; Al-Baradi A.M.; Al-Buriahi M.S.; Tekin H.O.
    Ionizing radiation interaction might occur during diagnostic imaging and radiotherapy procedures. It has been reported that gamma-ray radiation can damage the living cells through the energy transfer. Therefore, investigation the ionization radiation attenuation properties of biomaterials have a crucial importance. In the current study, tungsten disulphide (WS2) nanopowder-containing borate-based bioactive glass composites were prepared. Their physical, structural, mechanical and ionization radiation attenuation properties were investigated in detail. Monte Carlo simulations and radiation attenuation properties were studied through MCNPX and Phy-X/PSD. Results showed that sintering performed at 575 °C for 1 h in air atmosphere caused formation of some tungsten trioxide in the structure. Addition of WS2 nanopowders increased the bulk density and improved the mechanical properties of the prepared bioactive glass composites. Simulation studies revealed the influence of WS2 content on reduction the build-up factors and enhancement of the photon attenuation ability for all the considered photon energies. © 2021 Elsevier Ltd and Techna Group S.r.l.
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    Erbium (III)- and Terbium (III)-containing silicate-based bioactive glass powders: physical, structural and nuclear radiation shielding characteristics
    (Springer Science and Business Media Deutschland GmbH, 2021) Deliormanli A.M.; Issa S.A.M.; Al-Buriahi M.S.; Rahman B.; Zakaly H.M.H.; Tekin H.O.
    Erbium (III)- and terbium (III)-containing (1, 3 and 5 wt%) silicate-based bioactive glass powders were synthesized using sol–gel method. Their structural and physical properties were investigated. Radiation attenuation properties of the prepared glass samples were examined using Monte Carlo simulations. The photon transmission properties of the prepared bioactive specimens were obtained via Phy-X PSD program and FLUKA simulation. Results showed that all of the glasses synthesized in the study were amorphous. The true density values were measured in the range of 2.57–2.68 g/cm3. Simulation studies revealed that the lowest neutron cross section was observed for the pure 13–93 bioactive glass sample and the maximum neutron cross section was noted for the prepared bioactive specimens of 5% Er and 5% Tb. Bioactive glass powders synthesized in the study have potential to be used as radiation shielding material in tissue engineering applications. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.
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    Towards better understanding of structural, physical and radiation attenuation properties of the granites in Aegean region of Turkey: İzmir and Kütahya Provinces
    (Institute of Physics, 2022) Deliormanll A.M.; Deliormanll A.H.; Turan F.; Issa S.A.M.; Almisned G.; Tekin H.O.
    In this study, physical, chemical, structural and radiation attenuation properties of some granite samples collected from Kütahya-Simav and İzmir (Bergama and Karaburun) were investigated. The true particle density of the studied granite samples was in the range of 2.65 g cm-3 to 2.72 g cm-3 and the median particle diameter was between ∼12 μm and 41 μm. According to the structural examination results obtained from the study, the chemical compositions of the extracted granite samples varied by area. While SiO2 was the dominating component in certain locations, it was replaced by Fe2O3 in another. This condition also had a direct effect on the densities of the granite samples extracted. At the conclusion of the study, it was found that the predominant factor affecting the radiation shielding characteristics of granites was the quantity of Fe2O3 in the composition, with the greatest gamma-ray shielding qualities supplied by samples 4 and 5, which had the highest Fe2O3 ratio. Our results indicate that sample 5 and the previously studied Capao Bonita sample had comparable half value layer values at low, medium, and high gamma ray levels. It may be concluded that Izmir granites are a more attractive option to granite for usage as radiation shielding building materials, owing to their high Fe2O3 concentration, and may be a feasible alternative to less desirable concrete materials for shielding applications. © 2022 IOP Publishing Ltd.
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    A thorough examination of gadolinium (III)-containing silicate bioactive glasses: synthesis, physical, mechanical, elastic and radiation attenuation properties
    (Springer Science and Business Media Deutschland GmbH, 2022) Deliormanlı A.M.; Ensoylu M.; Issa S.A.M.; Rammah Y.S.; ALMisned G.; Tekin H.O.
    Gadolinium (III)-containing (1, 3 and 5 wt.%) silicate-based bioactive glass powders were synthesized by sol–gel method and subsequently die pressed to fabricate disc-shape glass samples. Sintering was performed at 690 °C for 1 h in air atmosphere. Physical, structural, and mechanical properties (compressive strength and Vickers hardness) of the fabricated glass pellets were investigated. Results showed that prepared glass samples were amorphous after sintering and any detrimental effect of Gd2O3 was not observed on the densification. An increase in bulk density and in compressive strength was obtained as the gadolinium (III) concentration was increased. On the other hand, a significant influence of the rare-earth element on the Vickers hardness was not seen. For the sample containing gadolinium (III) at highest concentration, Vickers hardness was measured to be 3.25 ± 0.23 GPa. Our findings indicate that increasing the quantity of Gadolinium (III) significantly affects the gamma-ray attenuation qualities of bioactive glass samples. The addition of Gadolinium (III) improved the attenuation qualities of the bioactive glass samples across a broad energy range. As a result, it can be concluded that Gadolinium (III) and its monotonic effect may be used to modify the basic features of bioactive glass samples. In addition, it can be concluded that this monotonic effect may be employed to optimize the circumstances of use of associated bioactive materials based on their requirements in medical and engineering applications. © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.