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Author: search.filters.author.Kaewnuam, E.Subject: search.filters.subject.X-ray imaging

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    Item type:Publication,
    Novel Tb3+ doped borophosphate glass scintillator for X-ray imaging
    (2024-10-01)
    Khrongchaiyaphum, F.
    ;
    Wantana, N.
    ;
    Kaewnuam, E.
    ;
    Pakawanit, P.
    ;
    Phoovasawat, C.
    In this study, we introduce an efficient green-emitting material made from Tb<sup>3+</sup> doped borophosphate scintillating glass for X-ray imaging. An influence of Tb<inf>2</inf>O<inf>3</inf> concentration on the physical, optical, luminescent, and scintillation properties of glasses were investigated. The glass density and refractive index increase, while the molar volume and Tb<sup>3+</sup> inter-ionic distance decreases with Tb<inf>2</inf>O<inf>3</inf> addition. These glasses absorb the photons in range of UV, Vis, and NIR. The excitations by UV and X-ray on glasses causes the strong green emission centered around 545 nm by the <sup>5</sup>D<inf>4</inf> → <sup>7</sup>F<inf>5</inf> transition of Tb<sup>3+</sup>. The energy transfer from Gd<sup>3+</sup> to Tb<sup>3+</sup> was occurred in this emission. The glass doped with 4 mol% of Tb<inf>2</inf>O<inf>3</inf> demonstrates the highest emission intensity at 545 nm due to the concentration quenching. The decay time of glasses are in few milliseconds. The integral X-ray scintillation efficiency of 4 mol% doped glass is 52% compared to that of BGO crystal. Additionally, this glass was proceeded in the X-ray imaging and yielded the image with satisfied resolution, characteristics and MTF values, compared to that obtained from YAG:Ce crystal. The developed glass has a potential for X-ray imaging applications, especially in the medical imaging, flaw detection, and security inspection.
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    Na2O-Gd2O3-Al2O3-P2O5 glass scintillator doped with Dy3+: X-rays and proton responses
    (2023-01-01)
    Wantana, N.
    ;
    Kaewnuam, E.
    ;
    Tariwong, Y.
    ;
    Quang, Nguyen Duy
    ;
    Pakawanit, P.
    Dy<sup>3+</sup>:Na<inf>2</inf>O-Al<inf>2</inf>O<inf>3</inf>-Gd<inf>2</inf>O<inf>3</inf>-P<inf>2</inf>O<inf>5</inf> (Dy:NAGP) glasses were fabricated to investigate the capability for radiation responses. The influence of Dy<inf>2</inf>O<inf>3</inf> concentration on glass properties was studied. The density and effective atomic number of glass increased with the addition of Dy<inf>2</inf>O<inf>3</inf> content. The glasses absorbed the photons in the ultraviolet, visible light, and near-infrared region. In photoluminescence (PL) spectra, the obvious yellow emission at 574 nm and blue emission at 482 nm of Dy<sup>3+</sup> were both generated by the direct excitation and the Gd-Dy energy transfer. The PL decay time of glasses was in the millisecond order. There was thermal quenching observed in temperature-dependent luminescence (TDL). The radioluminescence (RL) and protonluminescence (PrL) represented the emission pattern of Dy<sup>3+</sup> similarly to PL spectra. The concentration quenching caused 0.50Dy:NAGP glass with the highest PL and RL emission intensity. The X-ray imaging of developed glass using a synchrotron light source was successfully imaged for the first time.