Performance Characterization of a Plastic-Scintillator Sensor for Fast-Neutron, Thermal-Neutron, and Gamma-Ray Discrimination
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911735396433920 |
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| author | Liu, Yuhang An, Fengpeng Luo, Guang Wang, Wei Zhang, Xuesong Lu, Dixiao Yin, Xiaohao |
| author_facet | Liu, Yuhang An, Fengpeng Luo, Guang Wang, Wei Zhang, Xuesong Lu, Dixiao Yin, Xiaohao |
| contents | Discrimination of fast neutrons, thermal neutrons, and $γ$ rays in mixed radiation fields is important for radiation monitoring, reactor-related measurements, and background suppression in nuclear experiments. In this work, we investigate a compact plastic-scintillator sensor composed of EJ276 or EJ200 optically coupled to an EJ426 thermal neutron screen and read out by a single photomultiplier tube (PMT). The $γ$ equivalent energy response of the detector assemblies was calibrated using $^{137}$Cs, $^{22}$Na, and $^{60}$Co sources through Compton edge analysis, and pulse shape discrimination was evaluated with an AmBe neutron source under different moderator thicknesses. The EJ200+EJ426 assembly provides a well separated discrimination between thermal-neutron capture events and $γ$ dominated events over the measured range, with a figure of merit greater than 5. In contrast, the EJ276+EJ426 assembly produced three identifiable signal populations associated with $γ$ rays, fast neutrons, and thermal neutrons. These results show that the proposed sensor architecture is a promising compact approach for mixed field radiation applications |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_15585 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Performance Characterization of a Plastic-Scintillator Sensor for Fast-Neutron, Thermal-Neutron, and Gamma-Ray Discrimination Liu, Yuhang An, Fengpeng Luo, Guang Wang, Wei Zhang, Xuesong Lu, Dixiao Yin, Xiaohao Instrumentation and Detectors High Energy Physics - Experiment Discrimination of fast neutrons, thermal neutrons, and $γ$ rays in mixed radiation fields is important for radiation monitoring, reactor-related measurements, and background suppression in nuclear experiments. In this work, we investigate a compact plastic-scintillator sensor composed of EJ276 or EJ200 optically coupled to an EJ426 thermal neutron screen and read out by a single photomultiplier tube (PMT). The $γ$ equivalent energy response of the detector assemblies was calibrated using $^{137}$Cs, $^{22}$Na, and $^{60}$Co sources through Compton edge analysis, and pulse shape discrimination was evaluated with an AmBe neutron source under different moderator thicknesses. The EJ200+EJ426 assembly provides a well separated discrimination between thermal-neutron capture events and $γ$ dominated events over the measured range, with a figure of merit greater than 5. In contrast, the EJ276+EJ426 assembly produced three identifiable signal populations associated with $γ$ rays, fast neutrons, and thermal neutrons. These results show that the proposed sensor architecture is a promising compact approach for mixed field radiation applications |
| title | Performance Characterization of a Plastic-Scintillator Sensor for Fast-Neutron, Thermal-Neutron, and Gamma-Ray Discrimination |
| topic | Instrumentation and Detectors High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2512.15585 |