The Influence of BaO on the Mechanical and Gamma / Fast Neutron Shielding Properties of Lead Phosphate Glasses

The mechanical features evaluated theoretically using Makishima-Mackenzie's model for glasses xBaO-(50-x) PbO–50P2O5 where x = 0, 5, 10, 15, 20, 30, 40, and 50 mol%. Wherefore, the elastic characteristics; Young's, bulk, shear, and longitudinal modulus calculated. The obtained result showed an increase in the calculated values of elastic moduli with the replacement of the PbO by BaO contents. Moreover, the Poisson ratio, micro-hardness, and the softening temperature calculated for the investigated glasses. Besides, gamma and neutron shielding ability evaluated for the barium doped lead phosphate glasses. Monte Caro code (MCNP-5) and the Phy-X/PSD program applied to estimate the mass attenuation coefficient of the studied glasses. The decrease in the PbO ratio has a negative effect on the MAC. The highest MAC decreased from 65.896 cm2/g to 32.711 cm2/g at 0.015 MeV for BPP0 and BPP7, respectively. The calculated values of EBF and EABF showed that replacement of PbO with BaO contents in the studied BPP glasses helps to reduce the number of photons accumulated inside the studied BPP glasses. © 2021 Korean Nuclear Society.Taif University, Saudi Arabia is kindly acknowledged for Supporting our work through the Project number (TURSP-2020/84)

Multiple characterization of some glassy-alloys as photon and neutron shields: In-silico Monte Carlo investigation

In the present work, the nuclear radiation shielding proficiency of eight glassy alloys (Gd25RE25Co25Al25 (RE = Tb, Dy and Ho)) containing different amounts of rare earth elements was investigated with MCNPX simulation codes. Mass attenuation coefficients (μ/ρ) of the glassy alloys were simulated in the energy interval of 0.2-20 MeV by exploiting MCNPX codes, and the generated data were found to match with theoretical WinXCOM results. Next, other crucial photon attenuation parameters, effective atomic number (Zeff), Half Value Layer (HVL), and Mean Free Path (MFP), were gotten out using μ/ρ values. It was seen that Er20Tm20 and Er20Tb20 samples replaced with Er by Gd had the highest Zeff and μ/ρ values, whereas HVL and MFP values were the smallest among the other glassy alloys. Geometric progression (GP) procedure was enjoyed to achieve the exposure and energy absorption buildup factors (EBF and EABF) for the glassy alloys proposed. EABFs and EBFs took the largest and lowest values for Gd25Tb25 and Er20Tm20, respectively, to the other samples. Furthermore, the glassy alloys' neutron reduction abilities were estimated by acquiring fast neutron removal cross-sections (∑R). It was noticed that the ∑R values of the glassy alloys are increased with the rising sample density and seen to be comparable to ∑R values of water and ordinary concrete. The results obtained from this study are important in that they show that glassy alloys can be used as radiation shielding. © 2021 The Author(s). Published by IOP Publishing Ltd

SnO-reinforced silicate glasses and utilization in gamma-radiation-shielding applications

The influence of tin (II) oxide (SnO) on the g-ray radiation-protection characteristics of binary silicate glass samples with the form (100 - x)SiO2-xSnO, 40 mol% SiSn55 > SiSn50 > SiSn45 > SiSn40. The results showed that the half-value layers of the investigated samples were in the order SiSn40 > SiSn45 > SiSn50 > SiSn55 > SiSn60. The values of EBF and EABF show proportionate variations with the photon energy and chemical composition of the glasses. Therefore, the investigated glasses can be considered satisfactory materials for gamma ray protection, particularly the SiSn60 sample, with 60 mol% tin (II) oxide

FT-IR, ultrasonic and dielectric characteristics of neodymium (III)/ erbium (III) lead-borate glasses: experimental studies

Lead-borate glasses reinforced by Er3+ and Nd3+ ions with the form 50B2O3–30CaO–20PbO-0.5Er2O3-x (Nd2O3), where x = 0–1.50 mol% labelled as S1–S7 were fabricated utilizing the traditional melt quenching technique. Physical, structure, ultrasonic mechanical, and dielectric properties of the proposed glasses were investigated. The density of the glass system showed a decrement from 3757 to 3646 kg/m3. The molar volume increased from 2.566 × 10−5 m3 for glass sample S1 to 2.831 × 10−5 m3 for glass sample S7. Introduction of Nd3+ and Er3+ ions induced amplified changes in the local field on the lead ions giving rise to occur the forming of [PbO4] units. The average boron–boron separation (dB–B) varied from 3.49 × 10−10 to 3.61 × 10−10 Å for samples S1 and S7, respectively. The Nd3+ ions concentration takes values from 0 for S1 glass sample to 10.7 × 1025 ions m−3 for S7 glass sample. The N4 decreased with increasing rare earth ions content in glass composition. In contrast, the N3 which refers to the absorption band area related to the [BO3] group, increased. VL and VS increased from 5289 to 5529 ms−1 and from 2906 to 3093 ms−1, respectively with addition of Er3+ and increasing of Nd3+ ions from 0 (S1 sample) to 1.5 (S7 sample) mol%. The enhancement in dielectric constant was clearly observed. It increased from 25.4 to 55.3 with the change in composition from S1 to S7 at 50 kHz frequency. The ac conductivity was enhanced with increasing applied frequency especially at the high-frequency range