Pulse-shape discrimination and energy quenching of alpha particles in Cs2LiLaBr6:Ce3+
Pulse-shape discrimination and energy quenching of alpha particles in Cs2LiLaBr6:Ce3+
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DOI：
10.1016/j.nima.2016.10.033
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发表时间：
2016-09
影响因子：
1.4
通讯作者：
K. Mesick;D. Coupland;L. Stonehill
中科院分区：
文献类型：
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作者：
K. Mesick;D. Coupland;L. Stonehill
Cs2LiLaBr6：Ce3+(CLLB)是一种具有良好的线性度、伽马射线能量分辨率和对热中子的灵敏度，能够进行脉冲形状分辨(PSD)来区分伽马和中子的钙铝石闪烁体。我们对CLLB的研究表明，存在本征放射性阿尔法本底，我们已经确定这是由于镧组分中的铍污染所致。我们测量了伽马、热中子和阿尔法事件的脉冲形状，并确定PSD可以用来分离阿尔法背景，中等优劣系数为0.98。我们还测量了CLLB中α粒子的电子等效能，并模拟了227Ac的本征α背景，以确定α粒子的猝灭因子。在α粒子能量大于5 MeV时，发现了Lα=Eα×Q+L 0的线性猝灭关系，猝灭因子Q=0.71 MeVee/MeV，偏移量L 0=−1.19 MeVee。
Abstract Cs 2 LiLaBr 6: Ce 3+(CLLB) is an elpasolite scintillator that offers excellent linearity and gamma-ray energy resolution and sensitivity to thermal neutrons with the ability to perform pulse-shape discrimination (PSD) to distinguish gammas and neutrons. Our investigation of CLLB has indicated the presence of intrinsic radioactive alpha background that we have determined to be from actinium contamination of the lanthanum component. We measured the pulse shapes for gamma, thermal neutron, and alpha events and determined that PSD can be performed to separate the alpha background with a moderate figure of merit of 0.98. We also measured the electron-equivalent-energy of the alpha particles in CLLB and simulated the intrinsic alpha background from 227 Ac to determine the quenching factor of the alphas. A linear quenching relationship L α= E α× q+ L 0 was found at alpha particle energies above 5 MeV, with a quenching factor q= 0.71 MeVee/MeV and an offset L 0=− 1.19 MeVee.