Study of n-γ discrimination for 0.4−1 MeV neutrons using the zero-crossing method with a BC501A liquid scintillation detector

Chen, Yonghao; Jiarong, Lei; Zhang, Xiaodong; Liu, An; Peng, Zheng; Wang, Xinhua; Chuanxin, Zhu; He, Tao

doi:10.1088/1674-1137/37/4/046202

Cited by 7 publications

(3 citation statements)

References 12 publications

(13 reference statements)

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“…Fortunately, in liquid scintillation detectors, the shape of the light signals induced by neutrons is very different with respect to signals induced by gammas so that it is possible to use pulse shape discrimination (PSD) techniques [5,6]. In the past, PSD properties of liquid scintillation detectors have been studied extensively through these three methods: the charge comparison method [7][8][9], the rise time method [10] and the zero-crossing time method [11,12]. These PSD techniques have been investigated mainly through analog circuits.…”

Section: Introductionmentioning

confidence: 99%

Digital pulse shape discrimination technique for liquid scintillation detector EJ-301

Wan¹,

Li²,

Liu³

et al. 2019

J. Inst.

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A digital pulse shape discrimination (PSD) system has been built using a high speed digital oscilloscope NI-5772 and tested with an EJ-301 liquid scintillation detector. The sampling frequency of this system is 1.6 Gs/s. In this work, the charge comparison method, the rise time method and the zero-crossing time method are used to perform neutron-gamma discrimination. Experimental results show that the studied digital PSD algorithms can discriminate neutron and gamma rays in mixed radiation fields. The digital rise time method shows the optimal neutrongamma discrimination with integration parameter RC of 10000 ns. Moreover, the zero-crossing time method is investigated through CR-R 1 C 1 and CR-R 1 C 1 -R 2 C 2 shaping networks. It is found that for the same pair of values for the two kinds of network, the CR-R 1 C 1 -R 2 C 2 shaping network presents better neutron-gamma discrimination with R 2 C 2 of 5 ns. In addition, through the investigation of the distribution of neutron and gamma peaks for different energy regions, the relationship between the ionization density of liquid scintillation detector and the contribution of slow component in the light outputs is demonstrated. K: Digital signal processing (DSP); Particle identification methods; Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators) 1Corresponding author.

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Section: Introductionmentioning

confidence: 99%

Digital pulse shape discrimination technique for liquid scintillation detector EJ-301

Wan¹,

Li²,

Liu³

et al. 2019

J. Inst.

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“…Aiming to discriminate neutrons from γ-rays for the EJ-301 liquid scintillation detector, two common pulse shape discrimination (PSD) methods can be used. One of these is the zero-crossing method, which extracts the zero-crossing time of suitably shaped bipolar pulses [4,5]. The other is the charge comparison method, based on independent measurements of the integrated charge over two different time regions of the pulse [6,7].…”

Section: Introductionmentioning

confidence: 99%

Digital pulse shape discrimination methods for n-γ separation in an EJ-301 liquid scintillation detector

et al. 2015

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A digital pulse shape discrimination system based on a programmable module NI-5772 has been established and tested with EJ-301 liquid scintillation detector. The module was operated by means of running programs developed in LabVIEW with the sampling frequency up to 1.6GS/s. Standard gamma sources 22 Na, 137 Cs and 60 Co were used to calibrate the EJ-301 liquid scintillation detector, and the gamma response function has been obtained. Digital algorithms for charge comparison method and zero-crossing method have been developed. The experimental results showed that both digital signal processing (DSP) algorithms could discriminate neutrons from gamma-rays. Moreover, the zero-crossing method shows better n-γ discrimination at 80 keVee and lower, whereas the charge comparison method gives better results at higher thresholds. In addition, the figure-of-merit (FOM) of two different dimension detectors were extracted at 9 energy thresholds, and it was found that the smaller one presented a better n-γ separation property for fission neutrons.

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“…Thus, discriminating neutrons against an γ-rays background plays an essential role. The use of BC501A liquid scintillation detectors gives an efficient way to discriminate between neutrons and γ-rays by means of pulse shape discrimination (PSD) [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Study of n-γ discrimination in low energy range (above 40 keVee) by charge comparison method with a BC501A liquid scintillation detector

Chen¹,

Chen²,

Zhang³

et al. 2014

Chinese Phys. C

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A VME-based experiment system for n-γ discrimination using the charge comparison method was established. A data acquisition program for controlling the programmable modules and processing data online via VME64X bus was developed through the use of LabVIEW. The two-dimensional (2D) scatter plots of the charge in the slow component vs. the total charge of recorded pulses from 241 Am-Be and 252 Cf neutron sources were presented. The 2D scatter plots of the energy vs. the ratio of the charge in the slow component to the total charge of the pulses were presented at the meantime. The quality of n-γ discrimination was checked by the figure-of-merit, and the results showed good performance of n-γ discrimination at low energy range. Neutrons and γ-rays were separated above 50 keVee (electron-equivalent energy). The quality of n-γ discrimination have been improved compared with others' results at 5 energies (150, 250, 350, 450, 550 keVee).

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Study of n-γ discrimination for 0.4−1 MeV neutrons using the zero-crossing method with a BC501A liquid scintillation detector

Cited by 7 publications

References 12 publications

Digital pulse shape discrimination technique for liquid scintillation detector EJ-301

Digital pulse shape discrimination technique for liquid scintillation detector EJ-301

Digital pulse shape discrimination methods for n-γ separation in an EJ-301 liquid scintillation detector

Study of n-γ discrimination in low energy range (above 40 keVee) by charge comparison method with a BC501A liquid scintillation detector

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