Luminescence and scintillation behaviors of Sr co-doped CsI(Tl) Crystal Scintillator: Application to synchrotron and medical X-rays imaging

초록

The CsI(Tl) and CsI(Tl:xSr) were synthesized and grown using the Bridgman technique. The present work aims to study the effect of Sr co-doping on the scintillation performance of CsI(Tl) crystals to determine the potential applications in X-ray imaging systems. In the X-ray induced luminescence study at room temperature, emission spectra exhibit features characteristic of intrinsic CsI luminescence and Tl+ center emission. The presence of the co-dopant has no significant effect on the spectral characteristics. The scintillation performance study, including light output, energy resolution, and scintillation decay profile, was characterized by irradiating the grown crystals under a137Cs gamma-ray source. It was found that Sr co-doping in CsI(Tl) crystals resulted in a degradation of both light output and energy resolution, with an approximate 12% reduction in light output compared to the single-doped CsI(Tl) crystal. However, a suppression of afterglow was observed in the co-doped crystals, showing a reduction of approximately 1.5% relative to the single-doped crystal. This finding suggests that Sr can effectively suppress afterglow in CsI(Tl) crystal. We investigated X-ray imaging using diagnostic X-ray and Synchrotron X-ray as a source to study the performance of the grown crystal for practical applications. This study represents the first investigation of X-ray imaging obtained by Sr co-doped CsI(Tl) crystal. The above experiment results suggest that the developed crystal is a promising candidate for the X-ray imaging system, especially medical imaging and synchrotron X-ray computed tomography applications.

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