Yazar "Akkurt, İskender" seçeneğine göre listele
Listeleniyor 1 - 5 / 5
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe A closer look to dose assessment and radiation shielding characteristics of concrete doped magnetite irradiated with 252Cf mixed radiation radionuclide: A Watt Fission approach and Doppler effect(Elsevier Ltd., 2025) Malidarreh, Roya Boudaghi; Almousa, N.; Akkurt, İskender; Issa, Shams A.M.; Zakaly, Hesham M.H.Nuclear radiation emitted by fusion reactors, nuclear power plants, and medical establishments presents potential risks to living organisms personnel, necessitating the implementation of protective measures. To enhance radiation protection for patients workers, various materials can be utilized. Concrete, augmented with various additives, has historically acted as a shielding material. Hence, recent research has predominantly focused on enhancing concrete's ability to attenuate the harmful energy emitted by nuclear sources through modifications to its composition. Accordingly, in the present work, the dose evaluation and radiation shielding characteristics of a range of concrete magnetite (CM) formulations designated as CM-0 (control sample), CM-25, CM-50, CM-75, and CM-100 have been analyzed using MCNPX Monte Carlo (MC) approach and theoretical computations concerning 252Cf mixed radiation radionuclide. In this work, the Watt Fission distribution was employed to derive the neutron spectrum of CM samples, and findings have been thoroughly elucidated in the presence and absence of the specified samples. Then, utilizing the Doppler Effect, the gamma photon spectrum within shielding materials exposed to a spontaneous fission 252Cf source is extracted and characterized. Estimation of Half Value Thickness (HVT) and Mean Free Path (MFP) are provided across a broad spectrum of energy levels. The analysis confirms the successful development of a new type of concrete magnetite (CM) sample that exhibits lower radiation exposure compared to the control sample. This study offers valuable insights into the use of concrete in shielding against mixed radiation radionuclides and opens the door for future research involving similar materials. Specifically, the CM-100 sample demonstrated the lowest half-value thickness (HVT) and provided the most effective reduction of both neutron and gamma radiation. The findings suggest that increasing the concentration of magnetite in concrete greatly enhances its ability to shield against mixed neutron-gamma radiation. This innovation has promising potential for applications in radiation protection, particularly within nuclear reactors and medical facilities. The CM-100 sample showed a notable improvement, achieving an HVT of 0.012 cm and a dose rate reduction of 2.95 × 10−9 Sv.h−1, in contrast to the control sample (CM-0), which had an HVT of 10.358 cm and an equivalent dose rate of 2.84 × 10−9 Sv.h−1. These results underscore the superior shielding properties of the magnetite-doped concrete formulations. © 2024 Elsevier LtdÖğe Gamma ray shielding properties of CeO2-added hydroxyapatite composite(Springer, 2022) Almisned, Ghada; Akkurt, İskender; Tekin, Hüseyin Ozan; Erdamar, Işık Yeşim Dicle; Doğan, Serap ÖzhanIt is hard to control radiation especially if it is chargeless such as gamma rays. The radiation shielding is expressed in terms of some radiological parameters such as LAC, HVL, TVL, mfp, Zeff, Neff, and Ceff. In this study, the gamma ray shielding properties of hydroxyapatite (HAp) composites have been obtained and the effect of CeO2 on the shielding properties has also been investigated. © 2022, The Author(s) under exclusive licence to Australian Ceramic Society.Öğe Harnessing Fe2O3 to improve HAP composites: Investigating radiation shielding, mechanical attributes, and magnetic field effects(Elsevier Ltd., 2025) Almousa, N.; Malidarreh, Roya Boudaghi; Issa, Shams A.M.; Khandaker, Mayeen Uddin; Akkurt, İskender; Zakaly, Hesham M.H.Hydroxyapatite (HAP) bio-composites play a prominent role in addressing the reparative and replacement needs of human bone and dental tissues. Despite the suboptimal mechanical characteristics inherent in pure HAP, strength and durability enhancements have been achieved by incorporating various alloys and materials. The provided study delves into the radiation shielding and mechanical attributes of Fe2O3-reinforced HAP composites intended for use as implants, featuring Fe2O3 concentrations at 0.0, 2.5, 5.0, and 7.5 wt%. In addition, by leveraging the robust FLUKA Monte Carlo simulation code, the study explores the composites' response to the magnetic field. The findings suggest that augmenting the Fe2O3 content improves radiation shielding and mechanical properties in the chosen samples. Furthermore, in the absence of a magnetic field, the particles' spatial distribution (contour curves) exhibits symmetry along the X-axis. Nonetheless, a discernible pattern becomes apparent upon exposure to a magnetic field of Bx = 5 micro Tesla. The data extracted from this article can be used for medical and therapeutic applications and subsequent studies. © 2024 Elsevier LtdÖğe Radiation-shielding properties of titanium dioxide-added composites(ICE Publishing, 2022) Choudhary, Manju D.; Akkurt, İskender; Almisned, Ghada; Tekin, Hüseyin OzanIn radiation protection physics, development of alternative shielding materials to lead and lead-based materials is very popular nowadays, and thus, the present work aims to study the radiation-shielding parameters of a newly developed titanium dioxide (TiO2)-added hydroxyapatite composite material. The gamma-ray-shielding parameters were given in terms of the linear attenuation coefficient, half-value length, effective atomic number (Z eff) and effective electron density (N eff) for four different composites. The variations of these parameters with the titanium dioxide rate were also investigatedÖğe Variation in gamma ray shielding properties of glasses with increasing boron oxide content(De Gruyter Open Ltd, 2022) Almisned, Ghada; Akkurt, İskender; Tekin, Hüseyin OzanThe study of radiation shielding properties for a material is an important part of research in scientific world. It is expressed in terms of the linear linear coefficients (LAC) which can also be used to obtain some other parameters. The gamma shielding properties of glass with addition of boron oxides in different amounts were studied, thereby obtaining linear attenuation coefficients (LAC), mean free path (mfp), Exposure Buildup factor (EBF) which were calculated using Phy-X/PSD code. It was found that increasing boron oxide content of 0, 2, 4, 6, 8 (w %) in glass increased the gamma attenuation coefficients. © 2022 Walter de Gruyter GmbH, Berlin/Boston 2022.
