펠티어 냉각을 이용한 고온 환경 중성자·감마 동시 검출기 열안정성 연구
Feasibility Study of Neutron-Gamma Coincidence Measurement Technology Using a High-Temperature Scintillation Detector
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Precise measurement of neutron-gamma mixed fields is essential for safety monitoring in hightemperature nuclear facilities (e.g., power plants, spent-fuel storage, and SMRs). Conventional detectors optimized forroom temperature suffer gain drift, noise increase, and degraded pulse-shape discrimination (PSD) under heat. Thisstudy develops and validates a compact scintillation system that preserves simultaneous neutron-gamma detection upto 80oC. A CLLBC (Cs2LiLa(Br,Cl)6: Ce) scintillator was coupled to a silicon photomultiplier (SiPM) and integratedwith temperature-aware scintillation characterization, a thermal-management package using aluminum/polyurethanemultilayer insulation with optional Peltier cooling, and a digitally optimized PSD algorithm robust to temperatureinduced pulse variation. The prototype was evaluated from 20 to 80oC in 10oC steps using a 10 µCi 137Cs source at 20cm, comparing uncooled passive shielding, multilayer insulation, and insulation plus cooling. Performance metricsincluded dose-rate stability, energy resolution at 662 keV, signal-to-noise ratio, and PSD figure of merit (FOM). Thecombined passive-and-active thermal design maintained detector temperature within ±1oC and suppressed SiPM darkcurrent growth, yielding over 30× lower thermal sensitivity than the uncooled case. Energy-resolution degradationwas limited to ~20% (3.4 to 4.1%), and PSD FOM remained ≥0.97 at 80oC. Passive insulation delayed heat ingress,while Peltier cooling prevented gain drift. These results demonstrate a practical high-temperature neutron-gammamonitoring framework and provide a basis for AI-assisted PSD and autonomous mixed-field sensing in extremenuclear environments.
Abstract
Precise measurement of neutron-gamma mixed fields is essential for safety monitoring in hightemperature nuclear facilities (e.g., power plants, spent-fuel storage, and SMRs). Conventional detectors optimized forroom temperature suffer gain drift, noise increase, and degraded pulse-shape discrimination (PSD) under heat. Thisstudy develops and validates a compact scintillation system that preserves simultaneous neutron-gamma detection upto 80oC. A CLLBC (Cs2LiLa(Br,Cl)6: Ce) scintillator was coupled to a silicon photomultiplier (SiPM) and integratedwith temperature-aware scintillation characterization, a thermal-management package using aluminum/polyurethanemultilayer insulation with optional Peltier cooling, and a digitally optimized PSD algorithm robust to temperatureinduced pulse variation. The prototype was evaluated from 20 to 80oC in 10oC steps using a 10 µCi 137Cs source at 20cm, comparing uncooled passive shielding, multilayer insulation, and insulation plus cooling. Performance metricsincluded dose-rate stability, energy resolution at 662 keV, signal-to-noise ratio, and PSD figure of merit (FOM). Thecombined passive-and-active thermal design maintained detector temperature within ±1oC and suppressed SiPM darkcurrent growth, yielding over 30× lower thermal sensitivity than the uncooled case. Energy-resolution degradationwas limited to ~20% (3.4 to 4.1%), and PSD FOM remained ≥0.97 at 80oC. Passive insulation delayed heat ingress,while Peltier cooling prevented gain drift. These results demonstrate a practical high-temperature neutron-gammamonitoring framework and provide a basis for AI-assisted PSD and autonomous mixed-field sensing in extremenuclear environments.