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    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 Ltd
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    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 Ltd
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    Synergistic effects of Gd 2 O 3 and SiO 2 in enhancing the acoustic, mechanical, and shielding qualities of borate glasses
    (Pergamon elsevier science, 2024) Almousa, Nouf; Malidarreh, Roya Boudaghi; Issa, S. A. M.; Zakaly, Hesham M. H.
    This study comprehensively analyzes the gamma radiation shielding, mechanical, and acoustic properties of novel glass composites formulated from B2O3, SiO2, and Gd2O3. Utilizing the MCNPX simulation code and Phy-X: PSD software, key parameters such as Linear Attenuation Coefficient, Half Value Layer (HVL), Mean Free Path (MFP), and Effective Atomic Number (Zeff) were meticulously evaluated for three distinct glass compositions, denoted as GL-1, GL-2, and GL-3. The investigation revealed that incorporating Gd2O3 and SiO2 notably enhances the radiation shielding efficiency of these glasses, which is evident from the decreasing trends in HVL and MFP values across the series. Employing the Makishima and Mackenzie (MM) model, this study further delved into the mechanical and acoustic characteristics of the glass samples. An increase in Gd2O3 and SiO2 content, substituting B2O3, was observed to augment the bond dissociation energy and adjust the packing density, consequently improving the elastic moduli. These mechanical enhancements were quantified through measurements of Young's modulus, bulk modulus, shear modulus, and longitudinal modulus. Acoustic properties were also calculated, including Longitudinal and Transverse velocities, mean velocity, and acoustic impedance. These parameters demonstrated a consistent improvement correlating with the increasing rigidity and mechanical strength of the glass samples, particularly for the GL-3 composition. The study concludes that the GL-3 glass sample exhibits superior performance regarding gamma photon attenuation, mechanical robustness, and acoustic properties. This underscores its potential as an effective material for radiation shielding in various industrial applications, benefiting from its enhanced mechanical and acoustic features.