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Proceedings Paper

Growth and characterization of calcium-doped cesium iodide (CsI:Ca) optical crystals for radiation detection
Author(s): Imron Wadeng; Phannee Saengkaew; Visittapong Yordsri; Chanchana Thanachayanont; Noppadon Nuntawong
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Paper 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.

Paper Details

Date Published: 11 April 2019
PDF: 11 pages
Proc. SPIE 11028, Optical Sensors 2019, 1102838 (11 April 2019); doi: 10.1117/12.2523311
Show Author Affiliations
Imron Wadeng, Chulalongkorn Univ. (Thailand)
Phannee Saengkaew, Chulalongkorn Univ. (Thailand)
Visittapong Yordsri, National Science and Technology Development Agency (Thailand)
Chanchana Thanachayanont, National Science and Technology Development Agency (Thailand)
Noppadon Nuntawong, National Science and Technology Development Agency (Thailand)

Published in SPIE Proceedings Vol. 11028:
Optical Sensors 2019
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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