嘉兴市天然γ辐射水平瞬时监测与评价

Instantaneous Monitoring and Evaluation of NaturalγRadiation Level in Jiaxing City

为了解嘉兴市天然γ辐射水平、分布及其规律,估算公众受照剂量,为放射性事故预报预警及事故评估提供可靠、全面的数据。采用瞬时监测方法,使用便携式X、γ辐射剂量率仪(FH40G+FHZ672E-10)对全市136个点位进行了监测。结果表明:室内、室外γ辐射剂量率均值分别为12.2×10^-8 Gy/h和6.8×10^-8 Gy/h,不同材料路面的γ辐射剂量率均值为12.4×10^-8 Gy/h,花岗岩路面最高,天然γ辐射所致公众年有效剂量均值为683.2μSv/a。嘉兴市天然γ辐射处于良好水平,预计在未来几年内仍将保持稳定和良好的状态。

This paper analyzes the level,distribution and regularity of naturalγradiation in Jiaxing City,and estimates the public exposure dose,so as to provide reliable and comprehensive data for the prediction and early warning of radioactive accidents and accident assessment.By using the method of instantaneous monitoring,the portable X andγradiation dose rate meter(FH40G+FHZ672E-10)is used to monitor 136 points in the city.The average values of indoor and outdoorγradiation dose rates are 12.2×10^-8 Gy/h and 6.8×10^-8 Gy/h respectively.The averageγradiation dose rates of different pavement materials are 12.4×10^-8 Gy/h.The Granite pavement is the highest,and the average annual effective dose of the public caused by natural gamma radiation is 683.2μSv/a.The naturalγradiation in Jiaxing City is at a good level,which is expected to remain stable and good in the next few years.