Quantitative Analysis of Energy Resolution and Pulse Shape Discrimination of CLYC Detector with Integrated Digitizers

The recent dual gamma and neutron detector Cs2LiYCl6 (CLYC) scintillator has gained great interest and been developed in both scientific research and applications. CLYC has been used in radiation-monitoring device, imaging system, detection system in security check instruments at customs, ports, etc. With the rapid development of ADC (Analog-to-Digital Converter) and FPGA (Field Programmable Gate Array), the amplitude resolution and sampling frequency of an integrated digitizer has been improved dramatically. Generally, a higher performance digitizer will cost more and have more power dissipation, it is necessary to know how does the resolution and sampling frequency of a digitizer effect the Energy Resolution and PSD (Pulse Shape Discrimination) FOM (Figure-Of-Merit), while FOM is related to the GRR (Gamma Rejection Ratio). This paper will perform the quantitative analysis according to ADC quantized error theory at first, and then make the verification by several integrated digitizers with different sample speed and amplitude resolution. It will help to design or choose reasonable digitizers for different applications.