Search

• Newly developed Zinc-Tellurite glasses have been fabricated. • Nuclear shielding characterization of fabricated glasses was studied. • The experimental results then compared with simulated MCNPX and theoretical WinXCOM data. • ZTT3 glass sample with highest Ta 2 O 5 contribution has excellent nuclear radiation shielding ability. In this paper, the nuclear shielding properties of newly fabricated Zinc-Tellurite glasses doped with Ta 2 O 5 with a composition (25ZnO.75TeO 2) 100-x. (Ta 2 O 5) x (x=0, 1, 2, 3 mol%) were studied. Ta 2 O 5 doped Zinc-Tellurite glasses prepared by the traditional melt quenching method. The mass attenuation coefficients were achieved for prepared glasses at 0.081-0.383 MeV photon energies employing experimental transmission measurements, which were performed with 3 Ci Ba-133 point source and Ultra Ge detector. The experimental results were compared with simulated MCNPX and theoretical WinXCOM data. Moreover, another important nuclear shielding parameters such as mass attenuation coefficient, half value layer, effective atomic number, effective electron density, equivalent atomic numbers, alpha and proton projected ranges, mass stopping power in the protection of gamma, neutron, alpha and proton radiation were calculated. In addition, buildup factors of investigated glasses were determined by using the G-P fitting method. Moreover, effective removal cross section Σ R and transition factors were determined. According to the results, the addition of Ta 2 O 5 to the glass samples has a positive effect on the performance of nuclear shielding effects of the glass samples. It can be concluded that ZTT3 glass sample with the highest Ta 2 O 5 contribution has excellent nuclear radiation shielding ability among the other fabricated glass samples. [ABSTRACT FROM AUTHOR]

This paper focuses on the role of antimony oxide (up to 15 wt%) in the physical, structural, optical, and radiation attenuating characteristics of boro-bismuth glasses within B 2 O 3 -20Bi 2 O 3 - 20Na 2 O 2 - Sb 2 O 3 system. This glass system was prepared by melting at 1250°C and quenching into water. The physical properties were studied by measuring the density, molar volume, and x-ray diffraction for the prepared glass system. The structural features were investigated by determining packing density, passion ratio, oxygen packing density, and oxygen molar volume. The optical attributes were explored by evaluating bandgap, Urbach energy, refractive index, and other related parameters such as dielectric constant, reflection loss, molar polarizability, molar refractivity, optical dielectric constant, optical electronegativity, electron polarizability, optical basicity, metallization, and cut-off wavelength. On the other hand, the shielding properties of the prepared glasses were studied against different types of radiation such as gamma, electron, proton, and neutron beams. The radiation studies were carried out by utilizing Geant4 simulations and the newly developed Phy-X/PSD program. The radiation-shielding characteristics of the present samples were examined in terms of mass attenuation coefficient, stopping power, half value layer, removal cross section, mean free path, and effective atomic number of gamma, electron, and proton beams. The results showed that antimony oxide content had an important influence on the shielding ability against all of the types of radiations. Additionally, the obtained results were compared with those of standard radiation shields. It can be concluded that the present glasses have a promising future to be used as radiation shielding material, wherein the antimony oxide concentration can be balanced according to the desired application. [ABSTRACT FROM AUTHOR]

• Five samples of vanadyl boro-phosphate glasses V 2 O 5 -P 2 O 5 -B 2 O 3 have been synthesized. • Density, XRD, and UV–vis measurements have been performed. • The (E Gap) and n were evaluated by Tauc's, ASF, and DASF methods. • The (μ/ρ) has been computed using WinXCOM program. • Depending on the (μ/ρ), (HVL), (MFP), (Z eff) have been evaluated. In this paper, novel vanadyl boro-phosphate glasses with the chemical formula (100 − x)(0.5V 2 O 5 -0.5P 2 O 5)-xB 2 O 3 (x = 0, 2, 4, 6, 8 mol%) have been synthesized using melt-quenching method. The amorphous state of the glasses was checked through XRD measurements. UV–vis spectra were recorded in the range of 200–1100 nm wavelength. The optical energy band gaps via Tauc's model, absorbance spectrum fitting (ASF), and the first derivation of the absorption spectrum fitting (DASF) methods have been calculated for all glasses. Urbach's energy and refractive index of the prepared glasses also calculated. Gamma-photons shielding capability of the proposed glasses have been evaluated in terms of mass attenuation coefficient (μ/ρ) which calculated using WinXCOM software. Based the (μ/ρ), half value layer (HVL), mean free path (MFP), and effective atomic number (Z eff) were calculated. The results show that energy gaps for all glasses were close together, but the index of refraction was high around 4. Results of HVL, MFP, and Z eff confirmed that VPB0 glass sample (free with boron) has good attenuation capability compared to other VPB (with boron additions) glasses. Moreover, gamma-ray protection ability of the current glasses was compared with that of some commercial glasses. It can be concluded that the prepared glass samples could be useful to design or develop novel shields for radiation protection applications. [ABSTRACT FROM AUTHOR]