Correcting the temperature dependence of the SiPM scintillation detector

Abstract

The article presents a method to stabilise the output pulse for the SiPM scintillation detector, which uses CLYC(Ce) scintillation crystal coupled with a silicon photomultiplier (SiPM) to measure gamma and neutron radiation. This method is based on the characteristic of SiPM that its gain increases with increasing bias voltage and decreases with increasing temperature. A bias voltage supply was designed for SiPM that uses a microprocessor to manage and control the output voltage value according to the operating ambient temperature. The corrected data on the temperature dependence of the 662 keV peak energy of 137Cs radioactive source are stored in the memory. Depending on the measured ambient temperature, the microprocessor controls the bias voltage value for SiPM. The results show that in the operating temperature range of the detector from 0.5 to 45^oC, the change of 662 keV peak energy position when uncorrected and corrected is 247 and 5 channels, respectively. Thus, the method of correcting the temperature dependence of the SiPM output pulse amplitude in this study can be widely developed in scintillation detectors using SiPM to replace the photomultiplier tube (PMT).