Study on CeBr 3 Scintillation Detectors Used in Gamma-Ray Spectroscopy Measurements

Traditional scintillator detectors such as NaI(Tl) and LaBr₃(Ce) are widely used for gamma-ray energy spectrum measurements but face challenges in energy resolution, background interference, and temperature stability. The CeBr₃ scintillator, with its superior light yield and energy resolution, is a promising alternative, although its performance has not been thoroughly studied. This study evaluates the detection efficiency, luminescent and energy spectrum characteristics of CeBr₃ detectors under varying temperatures through Monte Carlo simulations and experimental comparisons. At 662 keV, the full-energy peak detection efficiency of the CeBr₃ detector was 55%, compared to 51% for NaI(Tl). The energy resolution of CeBr₃ was 4.10% versus 6.41% for NaI(Tl). Additionally, as the environmental temperature increased from -20 ° C to 50 ° C, the full-energy peak position of CeBr₃ shifted left by 21.43%, while NaI(Tl) showed a shift of 24.39% to the right from -20°C to 10°C, and then shifted left by 15.69% from 10 ° C to 50 ° C. The standard deviation of energy resolution variation due to temperature was only 0.12% for CeBr₃, compared to 1.13% for NaI(Tl). In comparison to LaBr₃(Ce), CeBr₃ exhibited minimal intrinsic background interference, showcasing superior low-level radioactivity detection capability. These results highlight the potential of CeBr₃ in gamma-ray energy spectrum measurements.