The LaBr3:Ce scintillator has been widely studied for nuclear spectroscopy because of its optimal energy resolution (<3%@ 662 keV) and time resolution (~300 ps). Despite these promising properties, the intrinsic radiation background of LaBr3:Ce is a critical issue, and pulse shape discrimination (PSD) has been shown to be an efficient potential method to suppress the alpha background from the 227Ac. In this paper, the charge comparison method (CCM) for alpha and gamma discrimination in LaBr3:Ce is quantitatively analysed and compared with two other typical PSD methods using digital pulse processing. The algorithm parameters and discrimination efficiency are calculated for each method. Moreover, for the CCM, the correlation between the CCM feature value distribution and the total charge (energy) is studied, and a fitting equation for the correlation is inferred and experimentally verified. Using the equations, an energy-dependent threshold can be chosen to optimize the discrimination efficiency. Additionally, the experimental results show a potential application in low-activity high-energy {\gamma} measurement by suppressing the alpha background.
@article{arxiv.1504.05346,
title = {Quantitative Analysis and Efficiency Study of PSD Methods for a LaBr3:Ce Detector},
author = {Ming Zeng and Jirong Cang and Zhi Zeng and Xiaoguang Yue and Jianping Cheng and Yinong Liu and Junli Li},
journal= {arXiv preprint arXiv:1504.05346},
year = {2021}
}
Comments
13 pages, 9 figures, accepted by NIM A (DOI:10.1016/j.nima.2015.12.045)