公众活动区域辐射异常的发现与思考
Detection and consideration of radiation abnormalities in public areas
杨金政 1房江奇 1张文峰 1刘林峰 1武明洋 1牛国臣1
作者信息
- 1. 核工业航测遥感中心,河北石家庄 050002;中核核应急航空监测工程技术研究中心,河北石家庄 050002
- 折叠
摘要
目的 开展公众活动区域γ辐射空气吸收剂量率水平调查,评价当地辐射环境状况.方法 采用无人机载大体积NaI(Tl)γ能谱探测系统,在西南某公众活动区域开展扫面式大比例尺空中辐射监测,获取地表 1m高度空气吸收剂量率.结果 通过对辐射环境航空监测结果分析,查明了当地区域的辐射环境现状,地面 1m高度空气吸收剂量率为(43.6±12.9)nGy/h;筛选辐射异常点 7处,其中 2处位于公众正在进行建筑施工的区域;在辐射异常点一带采用FH40G剂量率仪检查,其中一处地表 1m高度空气吸收剂量率最大值达 22.0 μGy/h;经现场土壤取样,实验室HPGeγ能谱仪分析,232Th核素活度浓度达 96.0 kBq/kg,226Ra核素活度浓度为 9.9 kBq/kg.结论 采用大体积NaI(Tl)γ能谱探测系统进行大比例尺空中扫面式航空监测是拉网式评价公众活动区域辐射现状水平快速有效的方法.
Abstract
Objective To measure the air-absorbed dose rate of gamma radiation in public areas for the situation of the local radiation environment.Methods Using a large-volume γ spectrometer system with a NaI(Tl)detector mounted on a UAV,we conducted large-scale airborne radiation monitoring in public areas in southwestern China,to measure the air-ab-sorbed dose rate at a height of 1 m from the earth's surface.Results The airborne radiation monitoring data were used to analyze the local radiation environment.The mean air-absorbed dose rate at a height of 1 m was 43.6±12.9 nGy/h.Seven abnormal radiation points were detected,and two of them were located where construction was ongoing.At one of the abnor-mal radiation points,FH40G meter measurements showed that the air-absorbed dose rate at a height of 1 m was up to 22.0 μGy/h.Field soil samples were collected for HPGe γ spectrometer analysis:the 232Th radionuclide activity concentration was 96.0 kBq/kg,and the 226Ra radionuclide activity concentration was 9.9 kBq/kg.Conclusion Using the UAV-mounted large-volume γ spectrometer system with NaI(Tl)detectors for large-scale airborne monitoring is a fast and effective method for dragnet monitoring of the level of radiation in public areas.
关键词
无人机/辐射异常/航空监测Key words
Unmanned aerial vehicle/Radiation abnormality/Airborne monitoring引用本文复制引用
基金项目
2021-2024年核能开发项目([2023]336号)
出版年
2024
NETL
NSTL
万方数据