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Author: search.filters.author.Wantana, N.Subject: search.filters.subject.Radiation shielding

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    Structural, optical, luminescence spectroscopy and radiation shielding properties of Eu3+:borophosphotellurite glasses
    (2024-10-01)
    Masthanaiah, E.
    ;
    Basavapoornima, Ch
    ;
    Lokanadham, R.
    ;
    Pecharapa, Wisanu
    ;
    Kaewkhao, J.
    Recently much effort is being paid to study the rare earth ions in multi component glass formers as they exhibit high enhancement in the efficiency of luminescence properties. In this direction, the present study focuses on the preparation and analysis of novel glass batches with composition of (in mol %) BPTCZEu: 40B<inf>2</inf>O<inf>3</inf>+20P<inf>2</inf>O<inf>5</inf>+15TeO<inf>2</inf>+ 10CaO+(15−x)ZnO + xEu<inf>2</inf>O<inf>3</inf>, x = 0.1, 0.5, 1.0, 1.5, 2.0 and 2.5. The important spectroscopic techniques such as optical absorption, luminescence, excitation and decay curves are taken to analyse the BPTCZEu glasses. Luminescence spectrum of BPTCZEu comprise of emission from excited (<sup>5</sup>D<inf>0</inf>) to the lower multiplets (<sup>7</sup>F<inf>J</inf> (J = 0−4)), among these, <sup>5</sup>D<inf>0</inf> → <sup>7</sup>F<inf>2</inf> (red luminescence) at 612 nm found to be very intense. Judd−Ofelt characteristics, Ω<inf>2</inf>, Ω<inf>4</inf> and Ω<inf>6</inf>, were derived from different constraints. To know the site symmetry around Eu<sup>3+</sup>, the fluorescence intensity ratio of <sup>5</sup>D<inf>0</inf> → <sup>7</sup>F<inf>2</inf> vs. <sup>5</sup>D<inf>0</inf> → <sup>7</sup>F<inf>1</inf> were analysed. Exciting <sup>7</sup>F<inf>0</inf> → <sup>5</sup>L<inf>6</inf> and monitoring <sup>5</sup>D<inf>0</inf> → <sup>7</sup>F<inf>2</inf>, the lifetime of <sup>5</sup>D<inf>0</inf> level is determined to be 2 ms which is independent of Eu<sup>3+</sup> content. The colour coordinates for all the Eu<sup>3+</sup> concentrations are estimated to fall in the reddish−orange region. Theoretical radiation shielding results showed that substituting Eu<inf>2</inf>O<inf>3</inf> for ZnO in the glasses lowers photon number that can pass via the material, enhancing the glass system's trend to shield high energy radiation. These stimulated results are compared with experimental measurements of mass attenuation coefficient with respect to energy up to 662 KeV using Cs−137 source. All these findings obtained from title glasses are compared and discussed with respect to reported Eu<sup>3+</sup>:glasses and no systematic variation has been noticed either with single, bi− or multi−component glass formers and therefore needs further systematic work to relate Eu−radiation−ligand interaction.
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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.