双通道高灵敏放射性气溶胶在线监测仪的研制

Abstract

Abstract: To address the demand for rapid warning capability and laboratory-comparable sensitivity in radioactive aerosol monitoring at nuclear facilities, a high sensitive online radioactive aerosol monitor has been developed. The instrument features a dual-channel (real-time/delayed) detection structure, achieving performance enhancements through:(1)Extended sampling track length;(2)Optimized real-time channel response (1 min data refresh);(3)Integrated radon interference suppression combining decay correction, energy spectrum discrimination, and α/β ratio compensation techniques. This single device simultaneously achieves both rapid response (1 minute response time for real-time channel) and high sensitivity (detection limits of 10^-4 Bq/m³(α) and 10^-2 Bq/m³ (β) in delayed channel), resolving the contradiction between these two parameters in aerosol monitoring. Compared with conventional online aerosol monitors, the α and β detection limits have been improved by two orders of magnitude, while also reducing both the workload of laboratory analysis for offline sampling and radiation exposure risks.

Key words: high sensitivity, on-line monitoring, radioactive aerosol, response time, radon compensation

CLC Number:

TL75+2.3

SHANG Jie, MAO Xueyong, YANG Yi, ZHANG Yanting, ZHANG Fuguo, YANG Liu. Development of a dual-channel high sensitive on-line monitor for radioactive aerosol[J].RADIATION PROTECTION, 2025, 45(4): 337-342.

References

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Development of a dual-channel high sensitive on-line monitor for radioactive aerosol

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