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B2O3–Bi2O3–TeO2–BaO and TeO2–Bi2O3–BaO glass systems: a comparative assessment of gamma-ray and fast and thermal neutron attenuation aspects
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B2O3–Bi2O3–TeO2–BaO and TeO2–Bi2O3–BaO glass systems: a comparative assessment of gamma-ray and fast and thermal neutron attenuation aspects
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B2O3–Bi2O3–TeO2–BaO and TeO2–Bi2O3–BaO glass systems: a comparative assessment of gamma-ray and fast and thermal neutron attenuation aspects
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Journal Article
B2O3–Bi2O3–TeO2–BaO and TeO2–Bi2O3–BaO glass systems: a comparative assessment of gamma-ray and fast and thermal neutron attenuation aspects
2020
Overview
For Pb-free 35B
2
O
3
‒35Bi
2
O
3
‒(30–
x
)TeO
2
‒(
x
)BaO (
x
= 5, 10, 15, 20, and 25 mol%) and (90–
x
)TeO
2
‒10Bi
2
O
3
‒(
x
)BaO (
x
= 10, 15, and 20 mol%) glass systems, gamma and neutron (both fast and thermal neutron) radiation shielding features were examined and compared. Within 0.015–15 MeV photon energy, mass attenuation coefficients (
μ
/
ρ
), for all samples, which have been assessed using WinXCOM program are in fair agreement with deduced MCNP5 simulation code
μ/ρ
results. For all selected samples, at the lowest energy,
μ
/
ρ
has bigger values whereas at higher energy regions possess lower values. Furthermore, by employing
μ
/
ρ
values, effective atomic number (
Z
eff
), effective electron density (
N
eff
), half-value layer (HVL), tenth-value layer (TVL), and mean free path (MFP) are figured out for both glass systems. For studied samples, with the gradual replacement of TeO
2
content with BaO, the derived values of
Z
eff
, HVL, TVL, and MFP revealed improved γ-ray shielding potentiality. Besides, within photon energy range of 0.015–15 MeV, exposure build-up factors (EBFs) and energy absorption build-up factors (EABFs) were estimated for all samples by utilizing G‒P fitting method as a function of different penetration depths (0.5, 1, 2, 3, 4, 5, 6, 7, 8, 10, 15, 20, 25, 30, 35, and 40 mfp). The 35B
2
O
3
–35Bi
2
O
3
–5TeO
2
–25BaO (mol%) glass relatively larger
μ
/
ρ
and
Z
eff
values, lower HVL, TVL, and MFP values, and minimal EBF and EABF values confirm its superior γ-ray attenuation competence among all samples. Additionally, in comparison, HVL and MFP values of 35B
2
O
3
–35Bi
2
O
3
–5TeO
2
–25BaO (mol%) sample are lower than the respective values of some commercial γ-ray shielding glasses and different types of standard concretes, signifying its better shielding features than them. Moreover, macroscopic removal cross-section for fast neutrons (
Σ
R
), coherent scattering cross-section (
σ
cs
), incoherent scattering cross-section (σ
ics
), absorption cross-section (
σ
A
), and total cross-section (
σ
T
) for thermal neutrons absorption were derived for both glass systems. Among all selected glasses, 35B
2
O
3
–35Bi
2
O
3
–5TeO
2
–25BaO (mol%) sample possesses relatively higher
Σ
R
(0.106 cm
−1
) and ‘
σ
T
’ (8.809 cm
−1
at 0.0253 eV neutron energy) values for fast and thermal neutrons attenuation, respectively, demonstrating its favorable absorption capability for neutrons.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
Subject
