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Author: search.filters.author.Kothan, S.Subject: search.filters.subject.Shielding

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    Fabrication luminescence and radiation shielding properties of Gd2O3–La2O3–ZnO–B2O3–Sm2O3 glasses
    (2023-01-01)
    Kaewjaeng, S.
    ;
    Kothan, S.
    ;
    Wantana, N.
    ;
    Kim, H. J.
    ;
    Rajaramakrishna, R.
    The purpose of developing high transparency radiation shielding materials and luminescence materials with stoichiometric ratio of xGd<inf>2</inf>O<inf>3</inf>:10La<inf>2</inf>O<inf>3</inf>:10ZnO:(79-x) B<inf>2</inf>O<inf>3</inf>: 1Sm<inf>2</inf>O<inf>3</inf> where x = 0, 5, 10, 15, and 20 mol% using melt quenching technique. The physio-optical properties such as molar volume, density, concentration of rare-earth ions, polaron radius, inter-ionic radius, optical basicity, average distance between rare-earth ions, and optical packing density of the present glasses has been evaluated. The glass samples obtained show high density which is vital factor for radiation shielding. The absorption spectra show significant of bands Sm<sup>3+</sup> ions. The FTIR results of Gd-La-Zn-B-Sm (Gd-1Sm) glass samples show signature borate BO<inf>3</inf> and BO<inf>4</inf> vibrational units in Gd-1Sm glass samples. The μ, μ<inf>m</inf>, HVL, TVL, and MFP were evaluated and showed that the values decrease with increasing X-ray energy whereas increase with an increase in Gd<inf>2</inf>O<inf>3</inf> content suggesting their potential use in X-ray diagnosis regions. The HVL value was compared with commercial windows, concrete, Serpentine and X-ray windows and found that the glasses doped with 10 mol%, 15mol%, and 20 mol% Gd<inf>2</inf>O<inf>3</inf> content showed better results than X-Ray windows at 10 kVp. The emission and excitation spectra of glass samples were studied and emission spectra show orange emission bands. The experimental lifetime analysis shows that the glass samples show decreasing trend from 1.161 to 1.128 ms with an increase in Gd<sup>3+</sup> ions exhibiting single exponential nature.
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    Effect of Gd2O3 on the radiation shielding, physical, optical and luminescence behaviors of Gd2O3–La2O3–ZnO–B2O3–Dy2O3 glasses
    (2021-08-01)
    Kaewjaeng, S.
    ;
    Wantana, N.
    ;
    Kothan, S.
    ;
    Rajaramakrishna, R.
    ;
    Kim, H. J.
    The present work focuses on lead-free glasses, their shielding behavior, and other optical studies. The glass composition with xGd<inf>2</inf>O<inf>3</inf>+10La<inf>2</inf>O<inf>3</inf>+10ZnO+(79-x) B<inf>2</inf>O<inf>3</inf>+1Dy<inf>2</inf>O<inf>3</inf>, x = 0, 5, 10, 15, 20 mol% were prepared to the characterization on physical, absorption spectra, photo-, radioluminescence, and radiation shielding properties. In the experimental results, the density of Gd-1Dy glass samples increases with the increase of Gd<sup>3+</sup> ions concentrations. The ten-strong peak in the 5Gd-1Dy glass of absorption spectra in UV–Vis–NIR regions. The white photoluminescence spectra base of Gd-1Dy glass samples can be generated under excitation at 351 nm makes the strongest emission of Dy<sup>3+</sup> ions and excitation through energy transfer from Gd<sup>3+</sup> in Gd-1Dy glass samples with 275 and 351 nm. This strong white emission of Dy<sup>3+</sup> ions also strong in x-ray luminescence and performs the integral scintillation efficiency of 33% when compared with BGO crystal. The radiation shielding properties in the diagnostic medicine energies region are correlated, the values of glass samples better than commercial windows, bricks, and concrete. The HVL values of glass sample at 15 and 20 mol% of Gd<inf>2</inf>O<inf>3</inf> has been found better than X-ray windows. The corollaries of Gd-1Dy glass samples can be a candidate for radiation detector and lead-free radiation shielding materials in future.