scholarly journals Manufacture of a fast neutron detector using EJ-301 liquid scintillator

2019 ◽  
Vol 2 (2) ◽  
pp. 76-81
Author(s):  
Chuan Van Phan ◽  
Hoa Duc Nguyen ◽  
Hai Xuan Nguyen ◽  
Tan Duy Nguyen
Keyword(s):  
Energy Range ◽  
Fast Neutron ◽  
Gamma Rays ◽  
Neutron Detector ◽  
Figure Of Merit ◽  
Liquid Scintillator ◽  
Neutron Detection ◽  
Fast Neutrons ◽  
252Cf Source ◽  
Electron Equivalent

A fast neutron detector using the EJ- 301 scintillator was manufactured for study on detecting fast neutrons and gamma-rays. Detector characteristics include the energy linearity, the efficiency response and the neutron/gamma discrimination were guaranteed for neutron detection in the energy range from 50 to 3000 keVee. The ability discrimination of neutrons/gamma-rays of the detector was evaluated by the charge comparison (CC) method using an 252Cf source. The total efficiencies when measured on 22Na, 137Cs, 60Co and 252Cf sources were obtained 17.8%, 3.9%, 9.8% and 14.8%, respectively. The Figure of Merit (FoM) values of CC method were 0.4–1.55 for the range of energy 50–1000 keVee (keV electron equivalent).

scholarly journals Verification of He-3 proportional counters’ fast neutron sensitivity through a comparison with He-4 detectors

2020 ◽  
Vol 135 (7) ◽  
Author(s):  
Francesco Piscitelli ◽  
Giacomo Mauri ◽  
Alessio Laloni ◽  
Richard Hall-Wilton
Keyword(s):  
Neutron Scattering ◽  
Fast Neutron ◽  
Gamma Rays ◽  
Cold Neutron ◽  
Neutron Detection ◽  
Kinetic Studies ◽  
Ground Level ◽  
Fast Neutrons ◽  
Helium 4 ◽  
Helium 3

AbstractIn the field of neutron scattering science, a large variety of instruments require detectors for thermal and cold neutrons. Helium-3 has been one of the main actors in thermal and cold neutron detection for many years. Nowadays, neutron facilities around the world are pushing their technologies to increase the available flux delivered at the instruments; this enables a completely new science landscape. Complementary with the increasing available flux, a better signal-to-background (S/B) ratio enables to perform new types of measurements. For instance, in neutron reflectometry, the time resolution for kinetic studies is limited by the available S/B. An improved S/B opens the possibility of sub-second kinetic studies. To this aim, this manuscript re-examines the background sensitivity of today’s “gold standard” neutron detection. Fast neutrons and gamma rays are the main background species in neutron scattering experiments. The efficiency (sensitivity) of detecting fast neutrons, cosmic rays and gamma rays, for a Helium-3-based detector is studied here through the comparison with Helium-4 counters. The comparison with Helium-4 allows to separate the thermal (and cold) neutron from the fast neutron contributions in Helium-3-based counters which are otherwise entangled, verifying previous results from an indirect method. A relatively high sensitivity is found. Moreover, an estimate for the cosmic neutron fluence, also a source of background, at ground level at ESS is presented in this manuscript.

Application research on neutron-gamma discrimination based on BC501A liquid scintillator

Kerntechnik ◽  
2021 ◽  
Vol 86 (6) ◽  
pp. 437-444
Author(s):  
J. Luo ◽  
S. Hou
Keyword(s):  
Fast Neutron ◽  
Figure Of Merit ◽  
Gamma Ray ◽  
Liquid Scintillator ◽  
Comparison Method ◽  
Mean Value ◽  
Neutron Multiplicity ◽  
Nuclear Disarmament ◽  
Zero Crossing ◽  
Non Destructive

Abstract Liquid organic scintillators are widely used in non-destructive analysis, which plays an important role in nuclear disarmament verification. This paper focused on studying the neutron-gamma discrimination technology in the fast neutron multiplicity measuring counter based on BC501A liquid scintillation detector. First, the charge comparison method, the zero-crossing time method and the rise time method were compared via the Geant4 and Matlab algorithm, and the result shows that charge comparison has the highest Figure of Merit. Then, a neutron-gamma discrimination system based on the six-probe fast neutron multiplicity counter was built and tested with a conclusion that the mean value of Figure of merit is 1.08, which verify the satisfactory neutron-gamma discriminating capability of the system. Finally, for the uranium samples, the mass are detected by fast neutron multiplicity counter, and the enrichment are measured by the characteristic gamma-ray signals using the system. The experimental results are in good agreement with the actual data.

Simulations of Interactions between Fast Neutrons and 4H-SiC Detectors

2015 ◽  
Vol 821-823 ◽  
pp. 863-866
Author(s):  
Stephane Biondo ◽  
Wilfried Vervisch ◽  
Laurent Ottaviani ◽  
Vanessa Vervisch ◽  
Raffaello Ferrone ◽  
...  
Keyword(s):  
Fast Neutron ◽  
Gamma Rays ◽  
Response Strength ◽  
Semiconductor Materials ◽  
Fast Neutrons ◽  
Nuclear Area ◽  
Particle Detectors ◽  
Nuclear Detection ◽  
Wide Gap ◽  
Nuclear Detector

Among particle detectors, particle detectors based on the wide gap semiconductor materials are many used in the nuclear area. For the reliable uses in hard and severe environment, the 4H-SiC is mainly used to the realization of nuclear detector components. This is a part of the topic of the I_SMART European project which proposes to study the nuclear detection of the thermal and fast neutron and gamma rays. In this paper, we deal with the Monte Carlo simulation results of interactions between particles and 4H-SiC detector. In particular, simulation works present the results between fast neutron and 4H-SiC sensor with a comparison between the simulation and experimental results. This article tries to point out the effect of the space charge region depletion, in particular the electric field on the signal response strength.

scholarly journals THE USE OF FAST NEUTRON DETECTION FOR MATERIALS ACCOUNTABILITY

2014 ◽  
Vol 27 ◽  
pp. 1460140 ◽  
Author(s):  
L. F. NAKAE ◽  
G. F. CHAPLINE ◽  
A. M. GLENN ◽  
P. L. KERR ◽  
K. S. KIM ◽  
...  
Keyword(s):  
Thermal Neutron ◽  
Fast Neutron ◽  
Liquid Scintillator ◽  
Neutron Detection ◽  
Nuclear Material ◽  
Detector Response ◽  
Surprising Result ◽  
Neutron Detectors ◽  
Detection Techniques ◽  
Fast Neutron Detection

For many years at LLNL, we have been developing time-correlated neutron detection techniques and algorithms for applications such as Arms Control, Threat Detection and Nuclear Material Assay. Many of our techniques have been developed specifically for the relatively low efficiency (a few percent) inherent in man-portable systems. Historically, thermal neutron detectors (mainly 3 He ) were used, taking advantage of the high thermal neutron interaction cross-sections, but more recently we have been investigating the use of fast neutron detection with liquid scintillators, inorganic crystals, and in the near future, pulse-shape discriminating plastics that respond over 1000 times faster (nanoseconds versus tens of microseconds) than thermal neutron detectors. Fast neutron detection offers considerable advantages, since the inherent nanosecond production timescales of fission and neutron-induced fission are preserved and measured instead of being lost in the thermalization of thermal neutron detectors. We are now applying fast neutron technology to the safeguards regime in the form of high efficiency counters. Faster detector response times and sensitivity to neutron momentum show promise in measuring, differentiating, and assaying samples that have modest to very high count rates, as well as mixed neutron sources (e.g., Pu oxide or Mixed Cm and Pu ). Here we report on measured results with our existing liquid scintillator array and promote the design of a nuclear material assay system that incorporates fast neutron detection, including the surprising result that fast liquid scintillator becomes competitive and even surpasses the precision of 3 He counters measuring correlated pairs in modest (kg) samples of plutonium.

scholarly journals Hybrid Neutron Detector Consisting of an Organic Liquid Scintillator and a 6Li Glass Scintillator for Wide Energy Range

2002 ◽  
Vol 1 (3) ◽  
pp. 317-319
Author(s):  
Eunjoo KIM ◽  
Akira ENDO ◽  
Yasuhiro YAMAGUCHI ◽  
Michio YOSHIZAWA ◽  
Takashi NAKAMURA ◽  
...  
Keyword(s):  
Energy Range ◽  
Neutron Detector ◽  
Liquid Scintillator ◽  
Organic Liquid ◽  
Wide Energy Range ◽  
Wide Energy

Neutron Radiation Detection

2014 ◽  
Vol 668-669 ◽  
pp. 932-935
Author(s):  
Zhen Ni Xing ◽  
Yang Liu ◽  
Guo Zheng Zhu ◽  
Shao Bei Luo
Keyword(s):  
Neutron Detector ◽  
Radiation Detection ◽  
Neutron Detection ◽  
Neutron Radiation ◽  
Fast Neutrons ◽  
Semiconductor Detectors ◽  
Neutron Detectors ◽  
Gas Detectors ◽  
Working Principle ◽  
Scintillator Detector

The basic principle of neutron detection was proposed in the twentieth century, especially G.F.Knoll compiled Radiation Detection And Measurement in 1979, including detailed in principles and methods of radiation detection and measurement on a variety of hot and fast neutrons. In recent decades there is not have a big breakthrough on the principle of neutron detection development, but there is a great improvement in the performance and scope of neutron detectors. Depending on the working principle of neutron detector, it is roughly divided into the following three: Gas detectors, Semiconductor detectors and Scintillator detector.

Response Functions of a Cs2LiYCl6 Scintillator to Neutron and Gamma Radiation

2013 ◽  
Author(s):  
Nafisah Khan ◽  
Rachid Machrafi ◽  
Vitali Kovaltchouk
Keyword(s):  
Gamma Rays ◽  
Neutron Detection ◽  
Fast Neutrons ◽  
Incident Neutron ◽  
Neutron Spectrometry ◽  
Extended Code ◽  
Fast Neutron Detection ◽  
Proton Peak ◽  
No Sensor ◽  
Thermal And Fast Neutrons

A new scintillator, CLYC, has been investigated for possible use in neutron spectrometry. This sensor provides neutron detection for both thermal and fast neutrons from the reactions 6Li(n,α) and 35Cl(n,p), respectively. This work primarily focuses on the detection of fast neutrons since there is currently no sensor that can accurately and efficiently provide information about their incident neutron energy. Conventional methods of fast neutron detection have been based on utilizing materials that use the elastic scattering process of neutrons on 1H to create recoil protons or by thermalizing and capturing these neutrons at thermal energies. Both approaches have drawbacks and are complex in deriving the energy spectrum through the unfolding process. The CLYC scintillator uses a distinct proton peak, whereby the position on the spectrum is proportional to the energy of the incident neutron. The response function of this detector has been simulated using Monte Carlo N-Particle eXtended code (MCNPX) for gamma-rays and neutrons of different energies. The obtained data has been discussed and analyzed.

scholarly journals NaI(Tl+Li) scintillator as multirange energies neutron detector

2021 ◽  
Vol 16 (12) ◽  
pp. P12011
Author(s):  
D. Ponomarev ◽  
D. Filosofov ◽  
J. Khushvaktov ◽  
A. Lubashevskiy ◽  
I. Rozova ◽  
...  
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Energy Range ◽  
Neutron Detector ◽  
Neutron Detection ◽  
Detection Sensitivity ◽  
Wide Energy Range ◽  
Γ Radiation ◽  
Wide Energy

Abstract Novel NaIL detector (5 × 6 inch) was investigated for its neutron detection in wide energy range. It has been found that the detector together with its known ability to detect the γ-radiation it also allows to distinguish neutron signals in three quasi-independent ways. It is sensitive to neutron fluxes on a level down to 10-3 cm-2 s-1. In this work intrinsic α-background and neutron detection sensitivity for the NaIL detector were obtained. Experimental data was compared with results of Geant4 Monte Carlo (MC).

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