Development of a Large-Volume Fast-Neutron Detector for Environmental Neutron Monitoring

Kim, H. J.; Lee, Sanghoon

doi:10.3938/jkps.53.3182

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…1(a), one can see that pulses of neutrons and gamma rays can be discriminated, but the discriminating effect is not good, and some neutron and gamma instances cannot be discriminated, such as neutron and gamma-ray signals with PSD values near 0.33. The mean gamma/electron equivalent energy of thermal neutrons is ~3.2 MeVee, which is due to the 6 Li(n,α) 3 H reaction with Q value of 4.78 MeV as well as the quenching effect within the scintillator [7]. Fig.…”

Section: Neutron-gamma Discrimination Of Charge Comparison Methodsmentioning

confidence: 97%

“…In our experiment, we used the CLLB scintillator (Φ 21mm × 25 mm length) by China Jiliang University with 17% 6 Li abundance. The CLLB scintillator is capable of detecting neutrons based on 6 Li(n, α) 3 H reaction and has a high thermal neutron capture cross-section (940 barn). The Hamamatsu R580 PMT was coupled with the CLLB for gamma and neutron detection.…”

Section: Methodsmentioning

confidence: 99%

“…To investigate the discrimination capability of the CLLB scintillator for neutron and gamma rays, the experiment used a AmBe neutron source with an activity of about 50 kBq is moderated by paraffin wax with 5cm thick to obtain thermal neutrons. To further investigate the response of CLLB to fast neutron, the 2.0 MeV deuteron beam was injected on a D/Ti target to generate a 5.2 MeV neutron beam by D(d, n) 3 He reaction from the 3MV tandem accelerator in Sichuan University [6].…”

Section: Methodsmentioning

confidence: 99%

“…Neutron detection has a wide range of applications as homeland security [1], neutron imaging systems [2], and environmental monitoring [3]. The lithium-containing scintillator Cs2LiLaBr6: Ce (CLLB) belongs to the elpasolite family, which exhibits good thermal neutron detection efficiency and excellent energy resolution (<5% for 662keV gamma rays), and high light yield (180,000) [4].…”

Section: Introductionmentioning

confidence: 99%

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The Neutron-Gamma Pulse Shape Discrimination of CLLB Detector

Song,

Peng,

Tong

et al. 2024

EPJ Web of Conf.

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Cs2LiLaBr6: Ce (CLLB) scintillator with the size of Φ 21mm × 25 mm coupled with PMT was used to detect neutron and gamma rays. The pulse shape discrimination (PSD) of neutrons and gamma rays by charge comparison method, the neutrons and gamma rays from AmBe source and fast neutron beam can be separated with figure-of-merit (FOM) values of 0.9 and 1.3, respectively. However, some neutron and gamma rays are difficult to distinguish, so new algorithms need to be investigated to improve the PSD performance of neutron and gamma. Artificial neural networks (ANN) have a very good image recognition capability, thus the ANN model was constructed to discriminate the waveforms of neutron and gamma rays. After ANN model training, the neutron and gamma signals of the CLLB detector were recognized with an accuracy of 98%, and the FOM value of the ANN method was calculated to be 19.4. This result is much higher than the charge comparison method, indicating better discrimination between neutrons and gamma rays with the ANN method.

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Section: Neutron-gamma Discrimination Of Charge Comparison Methodsmentioning

confidence: 97%