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Your search keyword '"Dong, M.G."' showing total 31 results
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31 results on '"Dong, M.G."'

29. Shielding properties of 80TeO2–5TiO2–(15−x) WO3–xAnOm glasses using WinXCom and MCNP5 code.

Author

Dong, M.G., El-Mallawany, R., Sayyed, M.I., and Tekin, H.O.

Subjects
*GAMMA rays, *MASS attenuation coefficients, *NEUTRONS, *MONTE Carlo method, *PHOTONS
Abstract

Gamma ray shielding properties of 80TeO 2 –5TiO 2 –(15−x) WO 3 –xA n O m glasses, where A n O m is Nb 2 O 5 = 0.01, 5, Nd 2 O 3 = 3, 5 and Er 2 O 3 = 5 mol% have been achieved. Shielding parameters; mass attenuation coefficients, half value layers, and macroscopic effective removal cross section for fast neutrons have been computed by using WinXCom program and MCNP5 Monte Carlo code. In addition, by using Geometric Progression method (G-P), exposure buildup factor values were also calculated. Variations of shielding parameters are discussed for the effect of REO addition into the glasses and photon energy. [ABSTRACT FROM AUTHOR]

Published
2017
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31. Physical, structural, thermal, and mechanical features combined with neutron and gamma radiation attenuation qualities of Sm2O3doped transparent borate-rich glasses

Author

Lakshminarayana, G., Dong, M.G., Al-Buriahi, M.S., Rekik, Najeh, Lee, Dong-Eun, Yoon, Jonghun, and Park, Taejoon

Abstract

Current work presents the synthesis of B2O3–Gd2O3–Li2O–Na2O–LiF‒Sm2O3glass system viamelt-quench approach and scrutiny of its mechanical, thermal, structural, physical, and nuclear radiation attenuation aspects. Raman scattering and Fourier transform infrared spectra revealed B–O stretching modes of BO4groups linked to BO3units with nonbridging oxygen atoms and BO3and BO4units' existence in the glass structure. By differential scanning calorimetry, glass transition and crystallization temperatures are identified. Relevant analysis showed all glasses' good thermal stability where glass transition temperature varied at 372–407 °C range. ΣR(fast neutron removal cross-section) and for energy 0.025 eV neutrons σT(total cross-section) are computed. In all glasses, 49.25 B2O3–10Gd2O3–10Li2O–10Na2O–20LiF-0.75Sm2O3(mol%) sample holds higher ΣR(= 0.10207 cm−1). 48B2O3–10Gd2O3–10Li2O–10Na2O–20LiF–2Sm2O3(mol%) glass possesses greater σT(= 736.675 cm−1) for thermal neutrons, hinting at added Sm2O3's favorable influence as Sm owns a better ability for neutron absorption than B. By Phy-X/PSD, μ/ρ(mass attenuation coefficient) is obtained at photon energy extent 15 keV‒15 MeV. Sm2O3inclusion from 0 to 2 mol% minorly enhanced the μ/ρvalues. Buildup factors estimated viageometric progression fitting method at 1–40 mean free path and energy 0.015–15 MeV span are maximal at medium energy region owing to Compton scattering process. 48B2O3–10Gd2O3–10Li2O–10Na2O–20LiF–2Sm2O3(mol%) sample shows superior γ-ray blocking capacity in all glasses, suggesting Sm2O3's positive effect. Elastic moduli and Poisson's ratio are computed theoretically by bond compression and Makishima–Mackenzie models. It is identified that all glasses could tolerate longitudinal stress over shear stress.

Published
2022
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