超大流量气溶胶自动连续采样分析系统监测方法研究

Abstract

Abstract: Due to different Placement decay time of aerosol samples, the detection limit of automatic continuous sampling and analysis system for ultra-large flow aerosol will be greatly affected. High detection limit may cause the fact that very low content of artificial radioactive substances in the air can not be detected. In order to develop an optimized and perfect monitoring method, this experiment studies natural radionuclides that mainly affect the background and their changes with the placement time, and further analyzes the changes of the detection limit of artificial radionuclides around nuclear facilities with sample placement time, by measuring the samples in different weather conditions for different placement time. The results show that for routine environmental monitoring, the samples on sunny day need to be placed for 2 days after collection; On rainy days, the collected samples shall be placed for 1 day before measurement; For emergency monitoring , direct measurement after sampling is required, the detection limit of sunny day samples are about 4-5 times of the minimum value and rainy day samples are about 2 times. It can be considered to measure the samples directly first and then conduct verification measurement after sufficient decay time.

Key words: aerosol, continuous monitoring, natural radionuclide, placement time, detection limit

CLC Number:

X830

CAO Longsheng, LIAO Yuhang, LV Anbiao, ZHOU Ying, ZHOU Feng. Study on monitoring method of automatic continuous sampling and analysis system for ultra-large flow aerosol[J].RADIATION PROTECTION, 2023, 43(3): 235-242.

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Study on monitoring method of automatic continuous sampling and analysis system for ultra-large flow aerosol

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