Limsuwan, Pichet

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Limsuwan, Pichet
Alternative Name
Limsuwan, P.
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Email
pichet.li@kmitl.ac.th

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    Item type:Publication,
    Ca co-doped CsI(Tl) crystal scintillator for γ- and X-ray detecting applications
    (2025-01-01)
    Tariwong, Y.
    ;
    Kim, H. J.
    ;
    Quang, Nguyen Duy
    ;
    Khan, Arshad
    ;
    Daniel, D. Joseph
    The vertical Bridgman method is used for the growth of single-doped CsI(Tl) and CsI(Tl:Ca) crystals, which has been evaluated for feasible applications in X-ray imaging and radiation detection. The powder XRD technique study reveals a single-crystalline phase of the grown crystal. The emission spectra show a broad emission band with a maximum of 540 nm under X-ray excitation, along with the characteristic emissions that arose from the Tl<sup>+</sup> intra-center transition. The scintillation qualities of the grown crystal were studied via the pulse height spectra, scintillation light yield, energy resolution, and scintillation decay time. Pulse shape discrimination (PSD) was investigated under γ-rays and α-particles excitation sources. Moreover, the X-ray imaging application was investigated by an X-ray synchrotron at the Synchrotron Light Research Institute to study the performance of the grown crystal. These preliminary investigations suggest that the grown CsI(Tl:Ca) crystal can be one of the promising crystals for γ- and X-ray detecting applications.
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    Radioluminescence properties of silicate-phosphate glass system based on “Huta Ginjang” quartz sand co-doped with Gd3+/Tb3+ ions for scintillation applications
    (2026-11-01)
    Rajagukguk, J.
    ;
    Hutahaean, Juniar
    ;
    Situmorang, Howard
    ;
    Sarumaha, C. S.
    ;
    Simanullang, E.
    A series of mixed silicate-phosphate glasses co-doped with Gd<sup>3+</sup>/Tb<sup>3+</sup> ions at varying Tb concentrations were successfully synthesized using the melt-quenching technique. Their physical, optical and luminescence properties were analyzed, with an emphasis on the role of Tb<sup>3+</sup> concentration. The photoluminescence (PL) spectra exhibit characteristic emission bands corresponding to Gd<sup>3+</sup> and Tb<sup>3+</sup> ions. A gradual decrease in the Gd<sup>3+</sup> emission intensity at 311 nm is observed, accompanied by the suppression of Tb<sup>3+</sup> emissions originating from the <sup>5</sup>D<inf>3</inf> level. In contrast, a significant enhancement of the green emission associated with the Tb<sup>3+</sup><sup>5</sup>D<inf>4</inf> → <sup>7</sup>F<inf>j</inf> transitions is clearly evident. Under X-ray excitation, the radioluminescence (RL) spectra of the glasses displayed multiple sharp emission peaks corresponding to Tb<sup>3+</sup> transitions, in contrast to the broad 478 nm emission band of the BGO crystal. Integral RL intensity ratios were demonstrated; all glasses exhibit significant radioluminescence intensity under X-Ray excitation compared to BGO, with QSPCaBaGd<inf>5</inf>Tb<inf>2.0</inf> showing the highest performance reaches up to 52.09% in the 350-800 nm range. These results, together with X-ray imaging capability, demonstrate that the developed glasses are promising candidates for cost-effective scintillation applications.