期刊
出版社
ELSEVIER
DOI: 10.1016/j.nima.2018.09.039
关键词
Scintillators; Pulse shape discrimination; PSD; Pulse pileup; Pileup rejection; Gamma-rejection; Gamma-rejection ratio; Stilbene; Liquid scintillator; EJ309; Active interrogation
类别
资金
- U.S. Department of Energy for Lawrence Livermore National Laboratory [DE-AC52-07NA27344, DHS/DNDO IAA HSHQDC-15-X-B0006]
- Domestic Nuclear Detection Office in the Department of Homeland Security
We compare the pulse-shape-discrimination performance of a large Stilbene detector, manufactured at the Lawrence Livermore National Laboratory, to a similarly sized liquid scintillator, made by Eljen Technologies, Inc. (type EJ309), under various high-count-rate scenarios, such as can be expected during Active Interrogation of objects using an electric neutron generator for detecting the presence of Special Nuclear Materials and contraband. Pulse Shape Discrimination (PSD) is performed with an extension of previously described wavelet and event fitting algorithms, which are also used to reject pileup events and to correct the energy calibration for event signals clipped during digitization. We find that strong PSD and pileup rejection cuts are required to function in this high-count-rate environment. Whereas the Stilbene detector has intrinsically better pulse-shape discrimination performance, the pulses of events from the liquid scintillator are somewhat narrower, reducing pileup. We use an event fitting cut that provides simultaneous PSD identification and pileup rejection. When applying the same cut to data taken with both detectors, we find that Stilbene has higher event use efficiency by about a factor of two and retains a better gamma rejection ratio compared to EJ309.
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