Crystal growth, luminescence and scintillation properties of Ba co-doped CsI:Tl crystal scintillator

초록

This study primarily focuses on the effect of Ba2+ co-doping on the luminescence and scintillation properties of the CsI:Tl crystal to assess its feasibility for detecting X- and gamma-rays in various fields. The Ba (0.05 and 0.10 mol%) co-doped CsI:Tl crystals were successfully synthesized by using the Bridgman method. As-grown crystals exhibited a single-crystalline phase, as determined by XRD analysis. At the room temperature, both photoluminescence and radioluminescence emission spectra of the single-doped CsI:Tl and Ba co-doped CsI:Tl crystals exhibit the characteristics of CsI intrinsic luminescence and Tl-center luminescence. The scintillation properties, including light yield, energy resolution, decay time, and non-proportionality, were studied under gamma irradiation. Light yield, energy resolution, and non-proportionality of CsI:Tl crystal are improved with Ba2+ co-doping. The energy resolution of CsI:Tl crystal at 662 keV gamma-rays is improved from 7.9 % to 5.5 %, and the light yield shows an approximately 13 % improvement with 0.10 mol% Ba co-doping. To summarize, the improved scintillation performance of the CsI:Tl crystal via Ba2+ co-doping indicates that the developed crystal is a good candidate for radiation detectors.

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