摘要
针对当前海洋、湖泊、水库、河流等水体放射性在线监测和应急监测的实际需要,研制了一套水体γ放射性在线监测系统。监测系统由基于Na I探测器的γ射线监测装置、4G远程终端(4G Remote Terminal Unit,4G-RTU)通信单元、供电一体化防水抗压浮体装置以及配套软件组成。利用监测系统开展了γ射线监测装置的主要性能指标、系统的适应性和准确性以及软件功能等测试,采集了足量的原始能谱数据,进行了设计指标与实测指标的对比分析,并开展了初步应用研究。结果表明:在4G网络覆盖的范围内,该系统能够实现全天时远程操控设备,完成实时在线监测并上传数据,满足应用需求,达到预期功能。系统的可探测能量范围为30~3 000 keV,对^(137)Cs的662 keV γ射线的能量分辨率为7.3%;对^(208)Tl的2 614 keV γ射线的能谱漂移为0.33%,能谱能量线性度为0.999 970;系统在连续工作7 h条件下,能谱稳定性最大值为2.28%,最小值为-2.36%,对^(137)Cs的最小可探测活度(Minimum Detectable Activity,MDA)为0.75 Bq·L^(-1);系统的工作温度范围为-5~+50℃。该系统可用于海洋、湖泊、河流等水体的放射性在线监测和应急监测领域,具有重要的推广价值和应用前景。
[Background]With the rapid development of nuclear energy and the wide application of nuclear technology,the radioactivity level of bodies of water has become a highly concerning issue for the public and governments,especially after the Fukushima nuclear accident in Japan.[Purpose]This study aims to develop an onlineγradioactivitymonitoring system based on 4G Remote Terminal Unit(4G-RTU)to meet the needs of online and emergency monitoring of water radioactivity.[Methods]First,theγ-ray monitoring device based on sodium iodide detector,4G-RTU,an integrated power supply waterproof and compression resistant floating device and corresponding software were employed to compose an online monitoring.Second,Qt programming control software was used to realize the remote control of the system,real-time radioactivity monitoring,and data upload.Finally,the original data obtained by the system were used to test the performance indicators,applicability,accuracy,and software functions to verify the practicability of the system.[Results]Within the coverage of the 4G network,the system realizes remote control of equipment,real-time online monitoring,and data upload throughout the day.The detectable energy range of the system is 30~3000 keV,and the energy resolution of the system for ^(137)Cs at 662 keV is 7.3%with minimum detectable activity of 0.75 Bq∙L^(-1).The spectral drift for 208Tl at 2614 keV is 0.33%,and the linearity of the spectral energy is 0.999970.The maximum value of energy spectrum stability is 2.28%for 7 h continuous operating,and the minimum value is-2.36%.The operating temperature range of the system is in the range of-5℃to+50℃.[Conclusions]The on-line monitoring system meets the application demand and achieves the expected function.It has important popularization value and application prospects in the field of online radioactive monitoring of bodies of water such as oceans,lakes,and rivers.
作者
张胜
王永军
王瑞军
黄清波
张春雷
武明洋
ZHANG Sheng;WANG Yongjun;WANG Ruijun;HUANG Qingbo;ZHANG Chunlei;WU Mingyang(Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang 050002,China;China National Airborne Monitoring Technical Support Center for Nuclear Emergency,Shijiazhuang 050002,China;China Nuclear Emergency Aviation Monitoring Engineering Technology Research Center,Shijiazhuang 050002,China)
出处
《核技术》
EI
CAS
CSCD
北大核心
2024年第1期76-86,共11页
Nuclear Techniques
基金
核工业航测遥感中心自主科研项目(No.2019-01)资助。
