Physics

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Author: search.filters.author.El Sayed Yousef

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    Environment friendly La3+ ions doped phosphate glasses/glass-ceramics for gamma radiation shielding: Their potential in nuclear safety applications
    (ELSEVIER, 2020) Y.S. Rammaha,; OLARINOYE, OYELEKE; F.I. El-Agawany; A. El-Adawy,; El Sayed Yousef
    Gamma-photon, neutron, and proton shielding parameters of La3+ ions doped multicomponent phosphate glasses/glass-ceramics of composition 50P2O5–30Sb2O3–10CaO–5Al2O3–5TeO2+xLa2O3 (La0–La5): x = 0–5 in steps of 1 mol% have been evaluated. These parameters were evaluated utilizing the WinXcom and EXABCal computer codes. Results revealed that the maximum values of MAC were 25.72, 26.85, 27.39, 27.91, and 28.41 cm2/g for La0–La5, respectively. Furthermore, the maximum and minimum values of LAC were obtained at 15 keV and 10 MeV, respectively with values of 91.82 and 0.107 cm−1, 94.67 and 0.108 cm−1, 98.55 and 0.111 cm−1, 101.62 and 0.113 cm−1, 105.22 and 0.115 cm−1, 107.96 and 0.116 cm−1. Values of HVL and MFP were varied according to the order (La5)HVL < (La4)HVL < (La3)HVL < (La2)HVL < (La1)HVL < (La0)HVL for all energies. The Zeff values were found to be maximum at 0.06 MeV and varied from 29.08 to 30.28 for La0 to La5, while the least values of Zeff were recorded at 1.5 MeV and varied from 14.88 to 15.53 for La0 to La5 samples. The buildup factors (B) at 15 MeV followed the trend (La0)B < (La1)B < (La2)B < (La3)B < (La4)B < (La5)B. The values of Rfor fast neutrons were 0.0911, 0.0989, 0.1078, 0.1157, 0.1242, and 0.1316 cm−1 for La0– La5, respectively. The maximum range of proton was obtained at the maximum kinetic energy (10 MeV) having the values: 0.574, 0.569, 0.559, 0.553, 0.544, and 0.540 mm for La0– La5, respectively. Therefore, the increase of La3+ doping in La0–La5 samples has a positive influence on their radiation shielding capability. It can be concluded that, La0–La5 samples can attenuate photons, neutrons, alpha particles, and protons and as such, they can be applied successfully in nuclear shielding applications.
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    The f-factor, neutron, gamma radiation and proton shielding competences of glasses with Pb or Pb/Bi heavy elements for nuclear protection applications
    (2020) Y.S. Rammaha,; OLARINOYE, OYELEKE; F.I. El-Agawanya,; A. El-Adawya,; El Sayed Yousef
    In this article, proton, neutron, and gamma-ray shielding competences of six glasses with PbO or PbO/Bi2O3 heavy metal oxides namely as Glass 1 to Glass 6 have been investigated via WinXcom and EXABCal computer codes. The maximum values of μm were equal to 50.6, 53.06, 72.51, 80.67, 99.54, and 102.35 cm2 g-1 at 0.015 MeV for Glass 1 to Glass 6, respectively. The μm of the glass's trend in ascending order for Glass 1 to Glass 6. Results of HVL and MFP of the glass's were trend in descending order for Glass 1 to Glass 6. The Zeff of glasses varied from 14.49 (1.5 MeV) to 37.78 (0.1 MeV) and from 43.93 (2 MeV) to 65.62 (0.02 MeV) for Glass 1 and Glass 6, respectively. The f-factor of Glass 5 and Glass 6 was maximum for throughout the energy spectrum. The buildup factors are low and grow with the penetration depth rapidly up to the maximum depth of 40 mfp. The values of ΣR were varied from 0.0947 to 0.1155 cm−1 for Glass1 to Glass 6, respectively. Glass 2 and Glass 6 are preferred fast neutron shield when compared with ordinary concrete, water, and graphite. Generally, the molar concentration of PbO or PbO + Bi2O3 improved the shielding capacity of the investigated glasses
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    Elastic moduli, photon, neutron, and proton shielding parameters of tellurite bismo-vanadate (TeO2–V2O5–Bi2O3) semiconductor glasses
    (ELSEVIER, 2020) Y.S. Rammah; OLARINOYE, OYELEKE; F.I. El-Agawany; A. El-Adawya; A. Gamala,; El Sayed Yousef
    In this research, elastic moduli, photon, neutron, proton, and alpha particle shielding parameters for tellurite bismo-vanadate (TeO2–V2O5–Bi2O3) were estimated and theoretically presented. Makishima–Mackenzie's (M-M) model and Phy-X/PSD software were used to achieve the required calculations. Young's modulus varied from 72.68 to 59.41 GPa while shear modulus varied from 28.75 to 23.66 GPa. Bulk modulus changed from 51.34 to 40.51 GPa, while Poisson's ratio changed from 0.264 to 0.255. The trend of the projected range for alpha and proton particles follows the order: (TVB00)Range > (TVB05)Range > (TVB10)Range > (TVB15)Range > (TVB20)Range > (TVB25)Range. The mass attenuation coefficient of the TVB glasses follows the order: (TVB00)μm<(TVB05)μm < (TVB10) μm < (TVB15) μm < (TVB20) μm < (TVB25) μm at all energies. The MFP follows a similar trend as HVT, where TVB00 glass has the highest MFP and HVT among the considered glasses. The lowest range of Zeff was achieved TVB00 glass and the highest for TVB25 glass. The f-factor of the TVB-glasses were almost equal due to similar number of electrons per unit mass. The variations in buildup factors with photon energy were identical for all glass materials and penetration depth (mfp). Results revealed that the inclusion and increase of Bi in the TVB-glass systems improves its radiation shielding capacity.