Newly developed BGO glasses: Synthesis, optical and nuclear radiation shielding properties

Tekın, H.O.; Kassab, L.R.P.; Issa, Shams A.M.; Martins, Michelle Márcia Viana; Bontempo, L.; Mattos, Guilherme Rodrigues da Silva

doi:10.1016/j.ceramint.2020.01.221

Cited by 29 publications

(4 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Transparent radiation shielding materials, as opposed to opaque radiation shielding materials, serve an essential role in nuclear engineering research because they provide substantial radiation protection while still being visible [1]. Recently, glasses have been considered as an alternative radiation shielding material due to properties such as their transparency, ease of manufacturing, nontoxicity, and high density [1][2][3][4][5][6][7][8]. Glass must be uniform in density and composition when used as a radiation shielding material.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Radiation Shielding Properties of a Tellurite Glass System Modified with Sodium Oxide

et al. 2022

View full text Add to dashboard Cite

In this study, the X-ray and gamma attenuation characteristics and optical properties of a synthesized tellurite–phosphate–sodium oxide glass system with a composition of (85 − x)TeO2–10P2O5–xNa2O mol% (where x = 15, 20, and 25) were evaluated. The glass systems we re fabricated by our research group using quenching melt fabrication. The shielding parameters of as-synthesized systems, such as the mass attenuation coefficient (MAC), linear attenuation coefficient (LAC), effective atomic number (Zeff), half-value layer (HVL), tenth value layer (TVL), mean free path (MFP), and effective electron density (Neff) in a wide energy range between 15 keV and 15 MeV, were estimated using well-known PHY-X/PSD software and recently developed MIKE software. Herein, the optical parameters of prepared glasses, such as molar volume (VM), oxygen molar volume (VO), oxygen packing density (OPD), molar polarizability(αm), molar refractivity (Rm), reflection loss (RL), and metallization (M), were estimated using MIKE software. Furthermore, the shielding performance of the prepared glasses was compared with that of commonly used standard glass shielding materials. The results show that the incorporation of sodium oxide into the matrix TeO2/P2O5 with an optimum concentration can yield a glass system with good shielding performance as well as good optical and physical properties, especially at low photon energy.

show abstract

Section: Introductionmentioning

confidence: 99%

Evaluation of the Radiation Shielding Properties of a Tellurite Glass System Modified with Sodium Oxide

et al. 2022

View full text Add to dashboard Cite

show abstract

“…[9] and https://phy-x.net/PSD web page. Moreover, the applied MCNPX (Monte Carlo N-Particle eXtended) [48] simulation set-up and process (Figure 1), Geant4 (for GEometry ANd Tracking) code [49][50][51], and PENELOPE ® (Penetration and ENErgy LOss of Positrons and Electrons) code [52] descriptions are the same as those we have given in our recent works [22,45,53,54], and they are not reproduced here.…”

Section: Methodsmentioning

confidence: 99%

Detailed Inspection of γ-ray, Fast and Thermal Neutrons Shielding Competence of Calcium Oxide or Strontium Oxide Comprising Bismuth Borate Glasses

Lakshminarayana

Elmahroug

Kumar³

et al. 2021

Materials

View full text Add to dashboard Cite

For both the B2O3-Bi2O3-CaO and B2O3-Bi2O3-SrO glass systems, γ-ray and neutron attenuation qualities were evaluated. Utilizing the Phy-X/PSD program, within the 0.015–15 MeV energy range, linear attenuation coefficients (µ) and mass attenuation coefficients (μ/ρ) were calculated, and the attained μ/ρ quantities match well with respective simulation results computed by MCNPX, Geant4, and Penelope codes. Instead of B2O3/CaO or B2O3/SrO, the Bi2O3 addition causes improved γ-ray shielding competence, i.e., rise in effective atomic number (Zeff) and a fall in half-value layer (HVL), tenth-value layer (TVL), and mean free path (MFP). Exposure buildup factors (EBFs) and energy absorption buildup factors (EABFs) were derived using a geometric progression (G–P) fitting approach at 1–40 mfp penetration depths (PDs), within the 0.015–15 MeV range. Computed radiation protection efficiency (RPE) values confirm their excellent capacity for lower energy photons shielding. Comparably greater density (7.59 g/cm3), larger μ, μ/ρ, Zeff, equivalent atomic number (Zeq), and RPE, with the lowest HVL, TVL, MFP, EBFs, and EABFs derived for 30B2O3-60Bi2O3-10SrO (mol%) glass suggest it as an excellent γ-ray attenuator. Additionally, 30B2O3-60Bi2O3-10SrO (mol%) glass holds a commensurably bigger macroscopic removal cross-section for fast neutrons (ΣR) (=0.1199 cm−1), obtained by applying Phy-X/PSD for fast neutrons shielding, owing to the presence of larger wt% of ‘Bi’ (80.6813 wt%) and moderate ‘B’ (2.0869 wt%) elements in it. 70B2O3-5Bi2O3-25CaO (mol%) sample (B: 17.5887 wt%, Bi: 24.2855 wt%, Ca: 11.6436 wt%, and O: 46.4821 wt%) shows high potentiality for thermal or slow neutrons and intermediate energy neutrons capture or absorption due to comprised high wt% of ‘B’ element in it.

show abstract

“…One of the most studied material used as scintillator is the Bismuth germanate (BGO) 8 . First synthesized in 1957, BGO is a cubic crystal with space group I43d possessing eulytine-type structure with octahedron and tetrahedron, an arrangement that can accommodate defects 1 , 9 . It has been extensively studied as a scintillator for various applications and found to emit light in the visible region upon exposure to ionizing radiation 10 .…”

Section: Introductionmentioning

confidence: 99%

First-principles studies of defect behaviour in bismuth germanate

Akande

Bouhali

2022

Sci Rep

View full text Add to dashboard Cite

Intrinsic defects are known to greatly affect the structural and electronic properties of scintillators thereby impacting performance when these materials are in operation. In order to overcome this effect, an understanding of the defect process is required for the design of more stable materials. Here we employed density functional theory calculations and the PBE0 hybrid functional to study the structural, electronic,defect process and optical properties of $$\hbox {Bi}_4\hbox {Ge}_3\hbox {O}_{{12}}$$ Bi 4 Ge 3 O 12 (BGO), a well know material used as scintillator. We examined possible intrinsic defects and calculated their formation energy and their impact on the properties that affect the scintillation process. Furthermore, we investigated the effect and role of rare earth element (REE = Nd, Pr, Ce and Tm) doping on the properties of the BGO system. While the PBE functional underestimated the band gap, the PBE0 was found to adequately describe the electronic properties of the system. Out of all the defects types considered, it was found that $$\hbox {Bi}_{{Ge}}$$ Bi Ge antisite is the most favourable defect. Analysis of the effect of this defect on the electronic properties of BGO revealed an opening of ingap states within the valence band. This observation suggests that the $$\hbox {Bi}^{3+}$$ Bi 3 + could be a charge trapping defect in BGO. We found that the calculated dopant substitution formation energy increases with increase in the size of the dopant and it turns out that the formation of O vacancy is easier in doped systems irrespective of the size of the dopant. We analyzed the optical spectra and noted variations in different regions of the photon energy spectra.

show abstract

Newly developed BGO glasses: Synthesis, optical and nuclear radiation shielding properties

Cited by 29 publications

References 38 publications

Evaluation of the Radiation Shielding Properties of a Tellurite Glass System Modified with Sodium Oxide

Evaluation of the Radiation Shielding Properties of a Tellurite Glass System Modified with Sodium Oxide

Detailed Inspection of γ-ray, Fast and Thermal Neutrons Shielding Competence of Calcium Oxide or Strontium Oxide Comprising Bismuth Borate Glasses

First-principles studies of defect behaviour in bismuth germanate

Contact Info

Product

Resources

About