Real-Time Wavelength Discrimination for Improved Neutron Discrimination in CLYC

Technical Report · Fri May 01 00:00:00 EDT 2015

DOI:https://doi.org/10.2172/1210158· OSTI ID:1210158

Hornback, Donald Eric ^[1]; Hu, Michael Z. ^[1]; Bell, Zane W. ^[1]

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1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

We investigated the effects of optical filters on the pulse shape discrimination properties of Cs₂LiYCl₆:Ce (CLYC) scintillator crystals. By viewing the scintillation light through various optical filters, we attempted to better distinguish between neutron and gamma ray events in the crystal. We applied commercial interference and colored glass filters in addition to fabricating quantum dot (QD) filters by suspending QDs in plastic films and glass. QD filters ultimately failed because of instability of the QDs with respect to oxidation when exposed to ambient air, and the tendency of the QDs to aggregate in the plastic. Of the commercial filters, the best results were obtained with a bandpass interference filter covering the spectral region containing core-valence luminescence (CVL) light. However, the PSD response of filtered CLYC light was always poorer than the response exhibited by unfiltered light because filters always reduced the amount of light available for signal processing.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1210158
• Report Number(s): ORNL/LTR-2015/343
• Country of Publication: United States
• Language: English