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    Enhanced gamma-ray shielding capabilities of Bi-Se-Ge chalcogenide glasses: analytical and simulation insights
    (Institute of Physics, 2024) Issa, Shams A. M.; Khandaker, Mayeen Uddin; Badawi, Ali; Zakaly, Hesham M H
    This study investigates the gamma-ray shielding properties of Bi-Se-Ge chalcogenide glasses using advanced computational tools. The Phy-X/PSD and FLUKA programs were utilized to determine critical shielding parameters such as linear attenuation coefficient ( G LAC ), mass attenuation coefficient ( G MAC ), half-value layer ( G HVL ), mean free path ( G MFP ), and effective atomic number ( Z eff ). Our findings reveal that these glasses exhibit superior shielding capabilities compared to traditional materials. For instance, the G MAC values for the glasses ranged from 101.472 cm2/g to 177.475 cm2/g at a photon energy of 0.015 MeV. Additionally, the G HVL values decreased significantly with increasing Bi content, from 4.082 cm to 3.104 cm at an energy level of 15 MeV. The effective atomic number ( Z eff ) also increased from 36.12 to 53.23 with higher Bi concentrations. These insights, derived from precise computational analysis, highlight the potential of Bi-Se-Ge glasses for applications in radiation protection. The discussion also examines the impact of substituting Bi atoms with Se on the shielding capabilities of the original Bi-Se-Ge glass. Future work will focus on experimental validation of these results to further substantiate our findings. © 2024 IOP Publishing 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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    Radiometric and petrographic characterization of El-Yatima granite: Evaluating radiological risks and mineralogical features
    (Pergamon-elsevier science, 2024) Zakaly, Hesham M. H.; Awad, Hamdy A.; Lasheen, El Saeed R.; Issa, Shams A. M.; Elsaman, Reda; Khandaker, Mayeen Uddin; Al-awah, Hezam; Fathy, Douaa; Sami, Mabrouk
    The current investigation aims to assess the potential of El-Yatima granitic pluton as a decorative stone by examining its natural radioactivity and mineralogical elements. Specifically, the study aims to determine the concentrations of radionuclides 40K, 232Th, and 226Ra, perform petrographic analyses, and evaluate the associated radiological risks to determine the safety and usability of the granite in construction and decoration, as well as to assess the potential of these granitic rocks as a safe and effective decorative stone for various applications. It has a 12 km2 surface area of 812 m above sea level. It is situated in the Eastern Central Desert. Its hypidiomorphic texture, medium-to-coarse grain size, and predominant composition of K-feldspars, quartz, and plagioclase are observed, along with minute amounts of muscovite and biotite. By employing NaI (Tl) gamma-ray spectroscopy, the natural radionuclide concentrations of 40K, 232Th, and 226Ra in El-Yatima granitic rocks were ascertained. Additionally, radiological concerns were identified for the materials that were examined. The average concentrations of radionuclides 40K, 232Th, and 226Ra are 178 Bqkg-1, 44 Bqkg- 1, and 41 Bqkg- 1, respectively. The following are the computed values: 117 Bqkg- 1, 0.43, 0.32, 53 nGyh-1, average radium equivalent (Raeq), hazard indices (Hin and Hex) and dose rate (D), respectively. When compared to levels typically indicated, it was discovered that its values were within the worldwide standard. The study's findings could be a starting point for radiometric data for upcoming surveillance and epidemiological research.