6LiF:ZnS(Ag) Neutron Detector Performance Optimized Using Waveform Recordings and ROC Curves

We used Gaussian separation and receiver operating characteristic (ROC) curves to optimize the neutron sensitivity and gamma rejection of an ultra-thin 6 LiF:ZnS(Ag)-scintillator-based neutron detector paired with a silicon photomultiplier (SiPM). We recorded the waveforms while operating the detect...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2020-01, Vol.67 (1), p.414-421
Main Authors: Pritchard, K., Osovizky, A., Ziegler, J., Binkley, E., Tsai, P., Hadad, N., Jackson, M., Hurlbut, C., Baltic, G. M., Majkrzak, C. F., Maliszewskyj, N. C.
Format: Article
Language:English
Subjects:
Algorithms
Cesium 137
Cesium isotopes
Cesium radioisotopes
charge comparison (CC)
Chromatic analysis neutron diffractometer or reflectometer (CANDOR)
Cold neutrons
Detectors
LiF:ZnS(Ag)
Microsoft Windows
Neutron beams
Neutron counters
neutron detector
Neutrons
Nuclear capture
Optimization
Particle beams
pattern recognition
Photomultiplier tubes
Photonics
pulse shape
radiation detector
receiver operating characteristic (ROC) curve
Scintillation counters
Scintillators
Sensors
Shape
silicon photomultiplier (SiPM)
support vector machine (SVM)
Waveforms
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Summary:We used Gaussian separation and receiver operating characteristic (ROC) curves to optimize the neutron sensitivity and gamma rejection of an ultra-thin 6 LiF:ZnS(Ag)-scintillator-based neutron detector paired with a silicon photomultiplier (SiPM). We recorded the waveforms while operating the detector in a monochromatic cold neutron beam and in the presence of isotopic 137 Cs and 60 Co gamma sources. We used a two-window charge comparison (CC) pulse-shape discrimination (PSD) technique to distinguish the neutron capture events from other types of signals. By feeding the recorded waveforms through variants of this algorithm, it was possible to optimize the duration of the integration windows [(0-100 ns) for the prompt window and (100-2300 ns)] for the delayed window. We then computed the detector's ROC curve from waveform recordings and compared that with the experimental performance. We also used this procedure to compare a series of detector configurations to select the optimal bias voltage for the SiPM photosensor.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2019.2953875