The measurement of neutron flux within a reactor is crucial for the safe operation of reactors.Scintillator fiber neutron detectors play a significant role in the online monitoring of in-pile neutron flux due to their stable operation,strong anti-interference capability,and the ability to probe into narrow spaces.This paper combines 6LiF/ZnS(Ag)mixed materials with optical fiber bundles to design a miniature high-temperature resistant neutron detector.The optimization design of the probe structure was completed using the Monte Carlo software Geant4 and the optical simulation software TracePro;the limitations of the powdered scintillation material for shape applications were solved using capillary glass tubes,significantly improving the light yield.Performance testing was conducted using the zero-power experimental reactor of the Nuclear Power Institute of China(NPIC)and the neutron experimental radiation source of the University of South China(USC).The results show that the detector has good high-temperature working stability,high counting rate,sensitive response,and strong γ-suppression capability,providing online monitoring capacity for relative neutron flux.This lays a solid foundation for the future development of high-count rate miniature scintillator neutron detectors suitable for higher temperature environments.
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