Radiation Hardness of a Fast Neutron Scintillation Spectrometer with a Stilbene Crystal

Klimenkov, E. E.; Kashchuk, Yu. A.; Krasilnikov, A.; Олейников, А. А.; Sevast'yanov, V. D.; Trykov, L.A.; Semenova, N. N.

doi:10.1023/b:inet.0000025195.61810.11

Cited by 10 publications

(4 citation statements)

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“…Although its light output is as low as ∼50% compared with that of anthracene, which is also a pure organic scintillator and has the highest scintillation efficiency among organic scintillators, stilbene is more advantageous in terms of its decay time (4.5 ns versus 30 ns of anthracene) and its scintillation characteristics that can distinguish signals from charged particles from those from electrons [4,9]. These advantages make it possible to use the stilbene scintillator in a high gamma-ray field.…”

Section: Stilbene Single Crystalmentioning

confidence: 99%

Development of large-area composite stilbene scintillator for fast neutron detection

Lee

Son

et al. 2013

Journal of Nuclear Science and Technology

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Fast neutron applications have gained popularity with the growth of fast neutron production facilities. Covering a larger area and/or wider angle can be one of the advantages of a fast neutron detector. In the present study, a large-area composite stilbene scintillator with the dimensions of 200 mm (D) × 20 mm (H) was fabricated to examine its scintillation properties and to evaluate its applicability to fast neutron detection. The detector response of small-and large-area composite stilbene scintillators for neutrons and gamma rays was measured and compared with that of commercial and small single-crystal stilbene scintillators. To this end, the response of each scintillator was measured for radioisotopes as well as mono-energetic neutrons generated by a Tandem accelerator. The neutron-gamma separation performance of the largearea composite stilbene scintillator was evaluated in terms of figure-of-merit (FoM) using the digital pulse shape discrimination method. The composite stilbene scintillator showed good energy linearity, as determined from its recoil proton spectra, with reasonable n-γ separation capability. The results indicated that the composite stilbene scintillator could be applied to the field of fast neutron detection, especially when a large area and/or a wide angle is to be covered and could be a good alternative to liquid scintillators.

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Section: Stilbene Single Crystalmentioning

confidence: 99%

Development of large-area composite stilbene scintillator for fast neutron detection

Lee

Son

et al. 2013

Journal of Nuclear Science and Technology

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“…A stilbene scintillator's light output efficiency is low: about 30% of that of an NaI(Tl) scintillator's. In contrast, a stilbene scintillator is more advantageous when comparing the light output created by charged particles and electrons [12,13].…”

Section: Stilbene Crystal Scintillatormentioning

confidence: 99%

Performance improvement of neutron flux monitor at KSTAR

et al. 2012

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The evaluation of plasma performance in fusion reactors is carried out by various particle or ion detection systems. Neutron diagnostic systems are used to evaluate different aspects of plasma performance and are very important tools because they can directly detect the neutrons of D-D or D-T fusion reactions. Among them, the stilbene scintillator has good Pulse Shape Discrimination (PSD), a fast response of 10 ns and it can also evaluate neutron energy using an unfolding method. Because of these properties, it was proposed as a neutron flux monitor in the Korea Superconducting Tokamak Advanced Research magnetic fusion reactor (KSTAR). Under high radiation fields, specially designed electronics are necessary to measure only fast neutron spectra and to reject background gamma rays. In order to increase the data transfer rate for real-time evaluation of plasma performance, we have developed a Flash Analog to Digital Convertor (FADC) with a Field-Programmable Gate Array (FPGA) that implements a Digital Charge Comparison (DCC) algorithm. Performance evaluation of stilbene was conducted in a 2011 KSTAR campaign and it showed good results for measuring real-time neutron flux with temporal resolution of 1 ms, and it operated well under high magnetic field conditions.

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“…Stilbene crystals have all the advantages of organic scintillators, and they were applied in the earliest n-γ discrimination applications [3]. Their excellent pulse shape discrimination properties and fast decay time about 3-7 ns [4] have made stilbene crystals the most useful organic scintillator [5,6] in the fast neutron field of detection, although its light output is lower than that of anthracene crystal [7].…”

Section: Introductionmentioning

confidence: 99%

Application of stilbene crystals in neutron measurement for monoenergetic neutron beam

et al. 2018

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Stilbene crystals are used as neutron detectors connected with photomultiplier tubes. An online acquisition method assembled by CAMAC standard plug-ins, NIM plug-ins, a neutron-γ (n-γ) discrimination plug-in named Canberra-2160A, and an offline acquisition method, assembled with an oscilloscope, were developed to obtain nuclear signals from neutron detectors. The online and offline acquisition methods collected pulse signals simultaneously while n-γ discrimination and measurement of deuterium-deuterium (DD) and deuterium-tritium (DT) neutron beam were carried out by both acquisition methods. The resulting n-γ discrimination, detection efficiency, and neutron spectra of varying stilbene crystal sizes were obtained. The neutron events accounted for approximately 80% of the total events in this radiation field formed by DD neutron beam and 50% for DT neutron beam. The results of n-γ discrimination of the two acquisition methods matched very well. The figures of merit (FoM) of n-γ discrimination obtained by the online acquisition method were 2.158 for the radiation field formed by DD neutron beam and 1.802 for DT when over 10 5 pulses were used for analysis. The pulses acquired by the offline acquisition method were repeatedly used to obtain the best discrimination effects, neutron charge-amplitude spectrum, and pulse height spectrum after the particular waveform digitization process. It was shown that the offline acquisition method composed of stilbene crystals, a photomultiplier tube, and a digital oscilloscope could realize the same function and effect as the online acquisition method for monoenergetic neutron beam, but with fewer pulses. A feasible experimental method was obtained which have a good potential for the neutron flux monitoring of the pulsed-neutron radiation fields, in which the total number of events is small or the neutron propagation process is instantaneous. K: Neutron detectors (cold, thermal, fast neutrons); Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators); Particle identification methods; Digital signal processing (DSP)

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Radiation Hardness of a Fast Neutron Scintillation Spectrometer with a Stilbene Crystal

Cited by 10 publications

References 0 publications

Development of large-area composite stilbene scintillator for fast neutron detection

Development of large-area composite stilbene scintillator for fast neutron detection

Performance improvement of neutron flux monitor at KSTAR

Application of stilbene crystals in neutron measurement for monoenergetic neutron beam

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