超大流量气溶胶自动连续采样分析系统监测方法研究

辐射防护 ›› 2023, Vol. 43 ›› Issue (3): 235-242.

超大流量气溶胶自动连续采样分析系统监测方法研究

曹龙生, 廖宇航, 吕安标, 周颖, 周峰

生态环境部辐射环境监测技术中心,国家环境保护辐射环境监测重点实验室,浙江省辐射环境安全监测重点实验室,杭州 310012

收稿日期:2022-01-26 出版日期:2023-05-20 发布日期:2023-06-07
通讯作者: 周峰。E-mail:zhoufeng150027@163.com
作者简介:曹龙生(1987—),男,2009年毕业于兰州大学核科学原子核物理专业,获学士学位,2012年毕业于东华理工大学核技术及应用专业,获硕士学位。E-mail:525467701@qq.com
基金资助:
浙江省生态环境科研和成果推广项目(2022HT0059)。

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

CAO Longsheng, LIAO Yuhang, LV Anbiao, ZHOU Ying, ZHOU Feng

Radiation Monitoring Technical Center of Ministry of Ecology and Environment, State Environmental Protection Key Laboratory of Radiation Environmental Monitoring, Key Laboratory of Radiation Environmental Safety Monitoring of Zhejiang Province, Hangzhou 310012

Received:2022-01-26 Online:2023-05-20 Published:2023-06-07

摘要/Abstract

摘要： 超大流量气溶胶自动连续采样分析系统因样品静置衰变时间不同,会对探测下限产生较大影响,可能导致空气中人工放射性物质含量极低时,因探测下限较高而无法监测到。为了研究出一套较为优化完善的监测方法,该实验通过对不同天气情况的样品进行不同放置时间的测量,研究主要影响其本底的天然放射性核素,及其随放置时间的变化情况,并进一步分析核设施外围主要关心的人工放射性核素探测下限随放置时间的变化情况。结果表明常规环境监测时,晴天样品采集完成需放置2天后再进行测量;雨天情况下样品采集完成放置1天后再进行测量;应急情况下需要采样后直接测量时,晴天样品的探测下限大约为最低值的4~5倍,雨天样品的探测下限大约为最低值的2倍,可以考虑先直接测量后,再静置衰变充分后进行复测验证。

关键词: 气溶胶, 连续监测, 天然放射性核素, 放置时间, 探测下限

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

中图分类号:

X830

曹龙生, 廖宇航, 吕安标, 周颖, 周峰. 超大流量气溶胶自动连续采样分析系统监测方法研究[J]. 辐射防护, 2023, 43(3): 235-242.

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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