同位素2026，Vol.39Issue(4)：340-348,9.DOI:10.7538/tws.2026.youxian.036
基于GEM的热中子探测器的优化设计研究
Optimized Design and Experimental Validation of a GEM-Based Thermal Neutron Detector
摘要
Abstract
The increasing demand for high-flux neutron detection,driven by next-generation neutron sources,necessitates alternatives to conventional 3He proportional counters,which are limited by space charge effects.This paper presents the development and experimental validation of a thermal neutron detector based on Gas Electron Multiplier(GEM)technology.Key detector parameters were systematically optimized using Monte Carlo simulations(Geant4,Garfield++,SRIM).An Ar/CO2 mixture with Ar>90%was selected as the working gas,an approximately 1 μm thick 6LiF coating was employed as the neutron conversion coating,and the electric field settings were optimized to EDrift≈150 V/cm,VGEM≈400 V,and EInduction>1.0 kV/cm.A prototype detector featuring a two-dimensional readout structure with an active area of 44 mm×44 mm was fabricated based on these optimized parameters.Preliminary performance tests conducted in a thermal neutron field demonstrated that the detector achieves measurement uniformity comparable to that of a 3He proportional counter,while providing millimeter-level geometric resolution in a single measurement.The counting rates in the"X"and"Y"directions are in good agreement with the theoretical values,laying a solid foundation for subsequent measurement applications under high-flux neutron beams.关键词
GEM/热中子探测/蒙特卡罗模拟/6LiF转换层Key words
GEM/thermal neutron detection/Monte Carlo simulation/6LiF converter分类
能源科技引用本文复制引用
何逾洋,李春娟,刘蕴韬,刘毅娜,吴会寅,王志强,张海贤..基于GEM的热中子探测器的优化设计研究[J].同位素,2026,39(4):340-348,9.基金项目
国防技术基础项目(BC202312000312) （BC202312000312）
