Growth and characterization of calcium-doped cesium iodide (CsI:Ca) optical crystals for radiation detection

Imron Wadeng; Phannee Saengkaew; Visittapong Yordsri; Chanchana Thanachayanont; Noppadon Nuntawong

doi:10.1117/12.2523311

11 April 2019 Growth and characterization of calcium-doped cesium iodide (CsI:Ca) optical crystals for radiation detection

Imron Wadeng, Phannee Saengkaew, Visittapong Yordsri, Chanchana Thanachayanont, Noppadon Nuntawong

Author Affiliations +

Proceedings Volume 11028, Optical Sensors 2019; 1102838 (2019) https://doi.org/10.1117/12.2523311
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic

Abstract

In this research, cesium iodide (CsI) optical crystals have been grown for radiation detectors by homemade Bridgman-Stockbarger method. CsI crystals have been innovated for optical properties by applying techniques of Ca doping and multiple doping of Ca and Tl. As a reference; CsI:Tl crystal was also grown in the identical growth system. The crystal growth was processed under argon atmosphere in a quartz crucible. The composition of dopant was kept a constant of 0.35%wt. X-ray diffraction measurements show that CsI:Tl and CsI(Tl,Ca) crystals have the cubic crystal structure with a dominant (110) plane. But CsI:Ca crystal has two dominant planes of (110) and (211). In addition, photoluminescence (PL) measurements were performed to investigate their optical properties: CsI:Ca and CsI(Tl,Ca) crystals emitted the blue light in a range of 420-450 nm wavelength with two dominant peaks but the orange light emission of 590-nm wavelength from CsI:Tl crystal. To evaluate the efficiency and energy resolution of radiation detection by coupling these CsI scintillators with a photomultiplier tube, the results reveal their different radiation performances due to the main difference in their optical properties about the light emission characteristics. In conclusion, the radiation performance of CsI:Ca scintillator has been still challenge to accomplish with the optimized growth condition and the suitable coupling devices.

Citation Download Citation

Imron Wadeng, Phannee Saengkaew, Visittapong Yordsri, Chanchana Thanachayanont, and Noppadon Nuntawong "Growth and characterization of calcium-doped cesium iodide (CsI:Ca) optical crystals for radiation detection", Proc. SPIE 11028, Optical Sensors 2019, 1102838 (11 April 2019); https://doi.org/10.1117/12.2523311

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