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Published October 2018 | public
Journal Article

Slow Scintillation Component and Radiation-Induced Readout Noise in Undoped CsI Crystals


Because of its fast scintillation and low cost, undoped CsI crystal has been used to construct crystal calorimeters for high-energy physics experiments. Undoped CsI crystal samples from three vendors were investigated at the Caltech Crystal Laboratory. In addition to the 30-ns fast scintillation peaked at 310 nm, a slow scintillation component peaked at 450 nm was found with a decay time of a few microseconds. The intensity of the slow component may be varied from the seed to the tail end, so it affects crystal's light response uniformity. It was also found that the slow component is highly correlated with the radiation-induced readout noise and may be eliminated spectroscopically by using an optical filter. The slow component is believed to be related to impurities and/or defects in the crystal.

Additional Information

© 2018 IEEE. Manuscript received July 17, 2018; accepted August 30, 2018. Date of publication September 6, 2018; date of current version October 17, 2018. This work was supported in part by the U.S. Department of Energy through the Office of High Energy Physics Program under Award DE-SC0011925, in part by the Fundamental Research Funds for the Central Universities of China, and in part by the Natural Science Funds of China under Grant 11775120.

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August 19, 2023
October 19, 2023