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Öğe Exploring the potential of bismuth-containing silicate borate glasses for optoelectronic devices and radiation protection(Elsevier B.V., 2024) Zakaly, Hesham M.H.; Issa, Shams A.M.; Ali A.S.; Almousa N.; Elsaman, Reda; Kubuki, Shiro; Atta M.M.This study studied novel bismuth silicate borate glasses with different bismuth oxide (Bi2O3) concentrations for their optical and γ-radiation shielding capabilities. The glass samples were characterized using UV–Vis–NIR spectroscopy to determine their optical properties, including the optical absorption spectra, absorption edge, and optical band gaps. The FLUKA algorithm was used to determine the radiation shielding parameters in the energy range of 0.01–15 MeV. The results revealed that the optical absorption edge and intensity were influenced by the Bi2O3 concentration, with the highest absorption observed in the sample with 35 mol% Bi2O3. The direct and indirect optical band gaps decreased with adding Bi2O3 up to 15 mol%, then increased at 25 mol%, and then reduced to the lowest value at 35 mol%. The system's crystallite size grew as the amount of Bi2O3 in the sample increased, as revealed by XRD. With increasing Bi2O3 content, it was discovered that the mass attenuation coefficient (μm) and radiation shielding effectiveness rose. The effective atomic number (Zeff) values increased as Bi2O3 content grew. T0.5 values of the glass samples increased as the energy increased and decreased as the Bi2O3 concentration increased. These findings suggest that prepared glasses with high Bi2O3 concentrations have potential applications in radiation shielding and optoelectronics. © 2024Öğe Natural radiological risk assessment around archaeological sites, El-Dakhla Oasis (EDO), egypt(Springer, 2024) Zakaly, Hesham M. H.; Elsaman, Reda; Kamal, Mohamed; Issa, Shams A. M.; Abbasi, Akbar; Shen, Jinsong; El-Taher, Atef; Yap, Chee Kong; Abdelbaky, Elsayed; Seleem, El-Montser M.The natural radionuclides in ancient El-Qasr village located in the El-Dakhla oasis (EDO), Egypt's Western Desert were measured using gamma-ray spectrometry equipped with a NaI (Tl) detector. The findings indicate that the samples' mean activity concentrations were 18.61 +/- 1.02, 16.67 +/- 0.9, and 137.67 +/- 6.9 Bq kg-1 for 226Ra, 232Th, and 40K, respectively. The values of Raeq, D, AED, Hex, Hin, I gamma, and ELCR for the samples ranged anywhere from 34.1 to 83.9 Bq kg-1, 15.7 to 37 nGy h-1, 19.26 to 45.384 Sv y-1, 0.09 to 0.23, 0.12 to 0.23, 0.25 to 0.59, and 6.74E-05 to 1.59E-04, respectively. These values are significantly lower than the international limit of 370 Bq kg-1 for Raeq, 59 nGy h-1 for D, 70 Sv y-1 for AED, 1 for Hex and Hin, 2 for I gamma, and 29E-03 for ELCR. According to the obtained data, none of the samples seemed to be a significant risk when it came to radiation exposure. Using these data, we will determine the baseline level of radionuclides that occur naturally in the area that is the subject of the inquiry.Öğe 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, MabroukThe 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.Öğe Unveiling the structural, optical, and electromagnetic attenuation characteristics of B2O3-SiO2-CaO-Bi2O3 glasses with varied WO3 content(Pergamon-Elsevier Science Ltd, 2023) Ali, Ahmed S.; Alrowaily, Albandari W.; Issa, Shams A. M.; Rashad, M.; Elsaman, Reda; Zakaly, Hesham M. H.This study provides insight into B2O3-SiO2-CaO-Bi2O3 glasses where novel results for the effects of WO3 content on its structural and optical properties have been demonstrated. Thus, provides useful data for developing new glasses for optical and electromagnetic shielding applications. The effect of WO3 content on the structural and optical properties of B2O3-SiO2-CaO-Bi2O3 glasses was investigated along with radiation shielding features which have been calculated by XCOM program. BSCB/W-00, BSCB/W-2.5, BSCB/W-5.0, BSCB/W-7.5, BSCB/W10, BSCB/W-15, and BSCB/W-20 refer to seven samples of bismuth borosilicate glass system doped with 0.0, 2.5, 5, 7.5, 10, 15, and 20% of WO3, respectively, synthesized using the melt quenching technique. The density of the glasses decreased with increasing WO3 content due to the replacement of Bi2O3 with lower-density WO3. It was found that the absorption coefficient decreased with increasing WO3 content up to 10 wt%, but showed an opposite trend for samples with higher WO3 content. The optical band gap and the transition type were affected as the WO3 content increased. The electromagnetic wave decay or skin depth was also calculated. Overall, the shielding effectiveness of investigated samples BSCB/W-00, BSCB/W-2.5, BSCB/W-5.0, BSCB/W-7.5, BSCB/W10, BSCB/W-15, and BSCB/W-20 has reduced with the enlargement of the WO3 concentration. BSCB/W-00, out of all the samples tested, has the highest shielding efficiency.
