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The LaBr3:Ce scintillator has been widely studied for nuclear spectroscopybecause of its optimal energy resolution (<3%@ 662 keV) and time resolution(~300 ps). Despite these promising properties, the intrinsic radiationbackground of LaBr3:Ce is a critical issue, and pulse shape discrimination(PSD) has been shown to be an efficient potential method to suppress the alphabackground from the 227Ac. In this paper, the charge comparison method (CCM)for alpha and gamma discrimination in LaBr3:Ce is quantitatively analysed andcompared with two other typical PSD methods using digital pulse processing. Thealgorithm parameters and discrimination efficiency are calculated for eachmethod. Moreover, for the CCM, the correlation between the CCM feature valuedistribution and the total charge (energy) is studied, and a fitting equationfor the correlation is inferred and experimentally verified. Using theequations, an energy-dependent threshold can be chosen to optimize thediscrimination efficiency. Additionally, the experimental results show apotential application in low-activity high-energy {\gamma} measurement bysuppressing the alpha background.

Quantitative Analysis and Efficiency Study of PSD Methods for a LaBr3:Ce Detector