2013—2020年四川省地表γ辐射水平及所致居民剂量分析

Analysis on the surface gamma radiation levels and residents exposure dose in Sichuan Province from 2013 to 2020

目的 检测四川省21个市(州)地表γ辐射剂量率水平,分析其所致居民的辐射剂量负担,了解2013—2020年四川省地表γ辐射剂量率现状水平和分布,初步建立四川省地表γ辐射剂量率数据库,为辐射防护提供科学、全面的基础数据。方法 根据国家相关标准,2013—2020年对四川21个市(州)地表γ辐射剂量率水平进行了现况检测,并估算其致居民的辐射剂量负担。Excel 2007软件建立数据库,采用SPSS 21.0软件分析其γ辐射剂量率水平。结果 四川省地表γ辐射剂量率水平在21.6 nGy/h~614.0 nGy/h之间,平均值为91.7 nGy/h;不同市(州)、不同监测点类型、不同海拔间的地表γ辐射剂量率不同;四川省环境γ辐射对居民产生的人均年有效剂量在0.13 mSv~3.77 mSv之间,均值为0.56 mSv。结论 四川省地表γ辐射剂量率高于全国平均水平,居民所受年有效剂量略高于全国水平和世界典型值,属于正常放射性的天然本底水平,人居环境不受影响。

Objective To detect the level and distribution of the surface gamma radiation dose rate of21 cities(prefectures) in Sichuan Province in recent years,analyze the radiation dose burden on the residents,and initially establish the surface gamma radiation dose rate database of Sichuan Province,so as to provide scientific and comprehensive basic data for radiation protection.Methods According to the relevant national standards,the surface gamma radiation dose rate of 21 cities(prefectures) in Sichuan province was detected,and the radiation dose burden of residents caused by gamma radiation was estimated.The database was established by using Excel 2007,and the γradiation dose rate was analyzed by using SPSS 21.0 software.Results The level of surface gamma radiation dose rate was between 21.6 nGy/h and 614.0 n Gy/h in Sichuan Province,with an average of 91.7 nGy/h.There were significant differences of the surface gamma radiation dose rate among different cities(states),monitoring points,and altitudes.The per capita annual effective dose equivalent of environmental gamma radiation to residents is between 0.13 mSv and 3.77 mSv,with an average value of 0.56 mSv.Conclusions The surface gamma radiation dose rate is higher than the national average in Sichuan Province.The annual effective dose equivalent of residents is slightly higher than the national level and the typical value in the world,which belongs to normal radioactivity and natural background level,and the human settlement environment is not affected.