Improved pulse shape discrimination in EJ-301 liquid scintillators

Lang, R. F.; Masson, D.; Pienaar, J.; Röttger, Stefan

doi:10.1016/j.nima.2017.02.090

Cited by 14 publications

(9 citation statements)

References 24 publications

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“…Some organic scintillators, including stilbene scintillators and a few commercial liquid scintillators, offer excellent PSD performances because slow components of the light emission will appear differently depending on the incident radiation particles [1,16]. Therefore, we can use various PSD methods utilizing the difference between decay times of gamma-ray and neutron pulses from the stilbene scintillator and the EJ-301 liquid scintillator.…”

Section: Methodsmentioning

confidence: 99%

Digital n-γ Pulse Shape Discrimination in Organic Scintillators with a High-Speed Digitizer

2019

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Background:As neutron fields are always accompanied by gamma rays, it is essential to distinguish neutrons from gamma rays in the detection of neutrons. Neutrons and gamma rays can be separated by pulse shape discrimination (PSD) methods. Recently, we performed characterization of a stilbene scintillator detector and an EJ-301 liquid scintillator detector with a highspeed digitizer DT5730 and investigated optimized PSD variables for both detectors. This study is for providing a basis for developing fast neutron/gamma-ray dual-particle imager. Materials and Methods:We conducted PSD experiments using stilbene scintillator and EJ-301 liquid scintillator and evaluated neutron and gamma ray discriminability of each PSD method with a 137 Cs gamma source and a 252 Cf neutron source. We implemented digital signal processing techniques to apply two PSD methods -the charge comparison (CC) method and the constant time discrimination (CTD) method -to distinguish neutrons from gamma rays. We tried to find optimized PSD variables giving the best discriminability in a given experimental condition. Results and Discussion:For the stilbene scintillator detector, the charge comparison method and the constant time discrimination method both delivered the PSD FOM values of 1.7. For the EJ-301 liquid scintillator detector, both PSD methods delivered the PSD FOM values of 1.79. With the same PSD variables, PSD performance was excellent in 300 ± 100 keVee, 500 ± 100 keVee, and 700 ± 100 keVee energy regions. This result shows that we can achieve an effective discrimination of neutrons from gamma rays using these scintillator detector systems. Conclusion:We applied both PSD methods to a stilbene and a liquid scintillator and optimized the PSD performance represented by FOM values. We observed a good separation performance of both scintillators combined with a high-speed digitizer and digital PSD. These results will provide reference values for the dual-particle imager we are developing, which can image both fast neutrons and gamma rays simultaneously.

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Section: Methodsmentioning

confidence: 99%

Digital n-γ Pulse Shape Discrimination in Organic Scintillators with a High-Speed Digitizer

2019

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“…The response of these detectors to 2.45 MeV neutrons has previously been characterized [12]. Furthermore, the functional dependence and absolute flux were measured at PTB with the Long Counter at a radial distance of 1569 mm and a polar angle of 90…”

Section: Methodsmentioning

confidence: 99%

Characterization of a deuterium–deuterium plasma fusion neutron generator

Lang

Pienaar

Hogenbirk

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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We characterize the neutron output of a deuterium-deuterium plasma fusion neutron generator, model 35-DD-W-S, manufactured by NSD/Gradel-Fusion. The measured energy spectrum is found to be dominated by neutron peaks at 2.2 MeV and 2.7 eV. A detailed GEANT4 simulation accurately reproduces the measured energy spectrum and confirms our understanding of the fusion process in this generator. Additionally, a contribution of 14.1 MeV neutrons from deuterium-tritium fusion is found at a level of 3.5%, from tritium produced in previous deuterium-deuterium reactions. We have measured both the absolute neutron flux as well as its relative variation on the operational parameters of the generator. We find the flux to be proportional to voltage V 3.32±0.14 and current I 0.97±0.01 . Further, we have measured the angular dependence of the neutron emission with respect to the polar angle. We conclude that it is well described by isotropic production of neutrons within the cathode field cage.

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“…The time interval ∆t is used to distinguish particle events, for which reported their improvement on PSD study with EJ-301 [23]. After amplified by the PMT, scintillation signals were digitized by CAEN DT5751, which records the response curve at 1 GHz with a resolution of 10 bits.…”

Section: Configuration For Fast Neutron Resonance Radiographymentioning

confidence: 99%

“…After amplified by the PMT, scintillation signals were digitized by CAEN DT5751, which records the response curve at 1 GHz with a resolution of 10 bits. Figure 3 in citation [23] present the response to neutron and the fast portion of a neutron event is suggested to be about 20 ns in width. Similar result is also shown in Figure 2 in citation [24] .…”

Section: Configuration For Fast Neutron Resonance Radiographymentioning

confidence: 99%

Energy-resolved fast neutron resonance radiography at CSNS

Tan

Tang

Jing

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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The white neutron beamline at the China Spallation Neutron Source will be used mainly for nuclear data measurements. It will be characterized by high flux and broad energy spectra. To exploit the beamline as a neutron imaging source, we propose a liquid scintillator fiber array for fast neutron resonance radiography. The fiber detector unit has a small exposed area, which will limit the event counts and separate the events in time, thus satisfying the requirements for single-event time-of-flight (SEToF) measurement.The current study addresses the physical design criteria for ToF measurement, including flux estimation and detector response. Future development and potential application of the technology are also discussed.

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Improved pulse shape discrimination in EJ-301 liquid scintillators

Cited by 14 publications

References 24 publications

Digital n-γ Pulse Shape Discrimination in Organic Scintillators with a High-Speed Digitizer

Digital n-γ Pulse Shape Discrimination in Organic Scintillators with a High-Speed Digitizer

Characterization of a deuterium–deuterium plasma fusion neutron generator

Energy-resolved fast neutron resonance radiography at CSNS

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