Characterization of 1-inch CLYC scintillator coupled with 8×8 SiPM array

摘要

The performance of an 1-inch CLYC scintillator coupled with 8×8 array of 3 mm silicon photomultipliers (SiPMs, SensL ArrayJ-30035-64P) were evaluated. Voltage amplifier and transimpedance amplifier circuits were developed for SiPM array readout, and their timing performances were compared with LED. Neutron and gamma pulse shape discrimination was implemented with a 12-bit digitizer running at 500 MSPS sampling rate and off-line processing. The CLYC crystal combined with SiPM array, readout with properly designed single channel transimpedance amplifier, yields 6.5% energy resolution at 662 keV and a FOM of 4.0, close to the performance of a 2-inch Hamamatsu R6231-100 PMT with the same crystal. The response of SiPM array was well linear in the energy range up to 1408 keV. Readout with four channel transimpedance amplifiers improves the PSD performance slightly, mainly at low energy region. The experimental results show that CLYC crystal combined with SiPM array has excellent neutron/gamma-ray discrimination and reasonable energy resolution, making it an ideal choice for compact devices with gamma and neutron dual detection capabilities.