Browsing by Author "Rammah, Y. S.,"

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Evaluation of radiation shielding capacity of vanadium–tellurite–antimonite semiconducting glasses
(ELSEVIER, 2021) Rammah, Y. S.,; OLARINOYE, OYELEKE; El-Agawany, F. I., Mahmoud, K. A., Akkurt, I., & Yousef, E.
Effects of antimony trioxide (Sb2O3) on the shielding features of ternary tellurite-vanadium- antimonite glasses were investigated. The glasses chemical composition are described by 40TeO2-(60-x) V2O5-xSb2O3: 0 ≤xSb2O3 ≤10 mol%. The mass attenuation coefficients (MAC) were simulated using Monte Carlo simulation code (MCNP- 5) and estimated theoretically via WinXcom program for 15 keV up to 15 MeV photon energy. Alpha and proton stopping power and projected range were computed utilizing the SRIM program. Furthermore, other effective shielding parameters like linear attenuation coefficient (LAC), desired shield thickness, and effective atomic number were calculated relying on the estimated MAC values. The photon’s accumulation within the studied glasses in terms of buildup factors has been estimated via the EXABCal program. The MAC shielding capacity’s output findings revealed an increment from 28.9 to 31.3 cm2/g with increasing the Sb2O3 ratio from 0 to 10 mol %, respectively. The glass samples coded TVS0 recorded the largest (ΣR) among all studied samples. Results concluded that raising the Sb2O3 insertion ratio is significantly enhances the TVS shielding capacity. Thus, the investigated glass samples are good candidates for several nuclear protection applications.
Investigation of mechanical, photon buildup factors, and neutron-sensing properties of B2O3–Al2O3–Li2O–CuO glasses.
(ELSEVIER, 2022) Rammah, Y. S.,; El-Agawany, F. I., Hessien, M. M.,; OLARINOYE, OYELEKE; Abdelghany, A. M., & Shams, M. S.
This study aims to investigate the utility of using 15PbF2–(60x)TeO2–25WO3–xNd2O3 (0.1 ≥ x ≥ 1.5) glasses in the nuclear shielding applications for mixed radiation fields at energies ranging from 15 keV to 15 MeV. The effect of Nd3+ ions on gamma attenuation properties of the present glass system was discussed in detail. The radiation attenuation features were investigated for the present glass system by using Monte Carlo radiation transport simulation via Geant4 toolkit. The simulation results were theoretically approved by using Phy-X approach over the entire considered energy range. The obtained results indicate that the values of Zeff and Neff were both highest in the in the τ/ρ dominated energies due to the atomic number dependence of the cross sections of the τ/ρ absorption processes. Moreover, FNRCS values were 0.1152, 0.1152, 0.1153, and 0.1153 cm−1 for PWTN1, PWTN2, PWTN3, and PWTN4 respectively. Finally, an extensive comparative study is also presented between the studied glass system and standard traditional shielding materials. The study suggests PWTN4 is the best photon shield amongst the studied PWTN-glasses.
Photon and neutron absorbing capacity of titanate - reinforced borate glasses: B2O3 – Li2O – Al2O3 – TiO2.
(ELSEVIER, 2021) Rammah, Y. S.,; OLARINOYE, OYELEKE; El-Agawany, F. I., Akkurt, I., & Yousef
The photon and neutron absorbing capacity of titanate-doped borate glasses: 65B2O3–30Li2O–5Al2O3–xTiO2: x = 0–30 mol% coded as G1–G7 were investi gated via WinXCOMandEXABCalcomputercodes. Mass(lm)andlinear (LAC) attenuation coefficients, mean-free path (MFP), half-value thickness (HVT), buildup factors (EABUF and EBUF), and the relative fast neutron absorbing efficacy were investigated. The maximum value of lm at 15 keV was 1.68, 2.976, 4.119, 5.134, 6.042, 6.856, and 7.593 cm2/g for G1, G2, G3, G4, G5, G6, and G7, respectively. For energies below 0.1 MeV and above 10 meV, lm values vary according to the order (G1)lm\(G2)lm\(G3)lm\(G4)lm\(G5)lm\(G6)lm\(G7)lm. Values of LAC followed the order: (G7)LAC[(G6)LAC[(G5)LAC [(G4)LAC[(G3)LAC[(G2)LAC[(G1)LAC. The trend of the MFP increases among the glasses follows a reverse order as that of LAC: (G1)MFP[(G2)MFP [(G3)MFP[(G4)MFP[(G5)MFP[(G6)MFP[(G7)MFP. The HVT of the glasses follow the order: (G1)HVT[(G2)HVT[(G3)HVT[(G4)HVT[(G5)HVT[(G6)HVT[(G7)HVT. EABUF and EBUF increase in the order (G1)(EABUF, EBUF)[(G2)(EABUF, EBUF)[(G3)(EABUF, EBUF)[(G4)(EABUF, EBUF)[(G5)(EABUF, EBUF)[(G6)(EABUF, EBUF)[(G7)(EABUF, EBUF). The investigated glasses (G1–G7) are better fast neutron absorbers compared to ordinary concrete and water. Results revealed that higher titanate doping concentrations produced better photon and fast neutron shielding capacities. Therefore, the investigated glasses showed superior shielding efficacy when compared with some traditional shielding materials; consequently, the G1–G7 glasses are recommended for use as ionizing radiation shields.
Photon, proton, and neutron shielding capacity of optical tellurite-vanadate glass systems: Theoretical investigation.
(ELSEVIER, 2021) Rammah, Y. S.,; OLARINOYE, OYELEKE; El-Agawany, F. I., & El-Adawy, A.
The influence of density and molar concentration of Ag2O on photon, proton, neutron, and alpha particle shielding capacity of tellurite-vanadate-silver glass systems with the form 40TeO2+(60-x)V2O5+xAg2O: x = 0–50 mol% (encoded as TVAg0- TVAg50) was evaluated and analyzed in a wide range of energy (0.015–15 MeV). Linear and mass attenuation coefficients (μ, μm), half value thickness (HVT), mean free path (MFP), and effective atomic number (Zeff) were evaluated via the free online program–Phy-X/PSD, while EBF and EABF were computed via EXABCal software. The maximum μm was obtained at the least photon energy (15 keV) with values equal to 29.702, 31.371, 32.949, 34.443, 35.86, and 37.205 cm2g-1 for TVAg0, TVAg10, TVAg20, TVAg30, TVAg40, and TVAg50, respectively. Generally, The μm of the glass’s trends in the order: (μm)TVAg0 <(μm)TVAg10 <(μm)TVAg20 <(μm)TVAg30 <(μm)TVAg40 <(μm)TVAg50. The trend of μ amongst the glasses is like that of the mass attenuation coefficient. The values of the maximum MFP varied from 9.757 to 4.53 cm for TVAg0 and TVAg50, respectively. The HVT trend of TVAg-glasses obeys the order: (HVT)TVAg0 >(HVT)TVAg10 >(HVT)TVAg20 > (HVT)TVAg30 >(HVT)TVAg40 >(HVT)TVAg50. The range of Zeff for the glasses varied from: 14.8 to 42.38 for TVAg0 glass and from 26.06 to 47.63 for TVAg50 glass. The f-factor of the TVAg-glasses were lower than unity except that of TVAg50 at 5 MeV. The variations in buildup factors with photon energy is alike for all glass materials and depth of penetration (mfp). The projected range (PR) followed the order: (PR)TVAg0 >(PR)TVAg10 >(PR)TVAg20 > (PR)TVAg30 >(PR)TVAg40 >(PR)TVAg50 for both proton and α-particle. Mass stopping power (MSP) is inversely proportional to the atomic number of the target (TAVg-glasses). Results confirmed that density and molar concentration of Ag2O plays an important role for improving the radiation shielding capacity of the investigated TAVg-glasses.
SrO-reinforced potassium sodium borophosphate bioactive glasses: Compositional, physical, spectral, structural properties and photon attenuation competence
(ELSEVIER, 2021) Rammah, Y. S.,; OLARINOYE, OYELEKE; El-Agawany, F. I., Ibrahim, S., & Ali, A. A.
The melt quenching process is assumed in making the glass system 45P2O5-15B2O3-22Na2O-(18-x) K2O: xSrO where x =0-12 mol%, namely as S1-S5. Compositional, physical, spectral, structural properties and radiations attenuation competences of S1-S5 bioglasses have been investigated compared to ordinary concrete (OC) cortical bone (CB) and soft tissue (ST). The density of the prepared bioactive glasses has been found to increase with an increase in the SrO content, whereas an opposite trend has been observed in the molar volume. FTIR study shows the existence of different structural groups such as BO3, BO4 and BPO4 units in the network. Optical absorption spectra of the glasses revealed that the cutoff wavelength decreases with increased in SrO content. The maximum (minimum) MAC values were 7.986 (0.021), 7.925 (0.0214), 7.863 (0.0217), 7.865 (0.0217) and 8.837 (0.022) cm2/g for S1, S2, S3, S4, and S5, respectively. The maximum value of LAC was also obtained at 15 keV with values equal to: 18.528, 18.942, 19.343, 19.898, and 20.144 cm1 respectively for S1-S5. At 0.1, 1.0, and 10 MeV, values of HVT of the glasses were 1.72, 1.54, 1.38, 1.34, and 1.14 cm for S1-S5, respectively, however, the HVT of S1–S5 were less than that of ordinary concrete (OC). The MFP was reduced as SrO content of the S1-S5 glasses increased. Results of the calculated radiation interaction parameters showed that S5 is a better photon, proton and electron absorber compared to the other four bioactive glasses in this study. Improving in photon absorption of the glasses was recorded for higher SrO content. The effect of SrO addition on photon (energy) absorption is more significant for photon energies less than 0.2 MeV. The studied bioactive glasses can function better than ordinary concrete for photon shielding applications.