双通道高灵敏放射性气溶胶在线监测仪的研制

辐射防护 ›› 2025, Vol. 45 ›› Issue (4): 337-342.

双通道高灵敏放射性气溶胶在线监测仪的研制

商洁¹, 冒学勇², 杨屹¹, 张艳婷¹, 张富国¹, 杨柳¹

1.中国辐射防护研究院辐射安全与防护山西省重点实验室中核集团辐射防护技术重点实验室,太原 030006;
2.苏州国家高新技术产业开发区(虎丘)固废管理与核辐射安全监督站,江苏苏州 215004

收稿日期:2024-12-06 发布日期:2025-07-28
作者简介:商洁(1986—),女,2012年毕业于河北大学光学专业,副研究员。E-mail:591238841@qq.com
基金资助:
放射性气溶胶动态辐射场重建测试创新平台建设(YDZJSX2024B015)。

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

SHANG Jie¹, MAO Xueyong², YANG Yi¹, ZHANG Yanting¹, ZHANG Fuguo¹, YANG Liu¹

1. China Institute for Radiation Proctection, Shanxi Key Laboratory for Radiation Safety and Protection, CNNC Key Laboratory for Radiation Protection Technology, Taiyuan 030006;
2. Suzhou National High-tech Industrial Development Zone (Huqiu) Solid Waste Management and Nuclear Radiation Safety Supervision Station,Jiangsu Suzhou 215004

Received:2024-12-06 Published:2025-07-28

摘要/Abstract

摘要： 针对核设施放射性气溶胶监测既可快速预警又可达到接近实验室离线分析的灵敏度的需求,研制了一款高灵敏放射性气溶胶在线监测仪。通过采取即时与延时双通道结构设计,增加采样轨道长度,优化即时道响应时间,综合应用衰变法、能量甄别和α/β比值的氡扣除技术,降低探测限值。一台设备可同时满足快速响应(即时道响应时间1 min)与高灵敏度(延迟道探测限值α为10^-4 Bq/m³,β为10^-2 Bq/m³)特性,巧妙地解决了常规气溶胶监测中两个参数相悖的问题。相比传统气溶胶在线监测仪,α与β探测限值均提高了2个量级,且降低了当前离线取样的实验室分析工作量和受照风险。

关键词: 高灵敏, 在线监测, 放射性气溶胶, 响应时间, 氡补偿

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

中图分类号:

TL75+2.3

商洁, 冒学勇, 杨屹, 张艳婷, 张富国, 杨柳. 双通道高灵敏放射性气溶胶在线监测仪的研制[J]. 辐射防护, 2025, 45(4): 337-342.

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.

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