Analysis on the surface gamma radiation levels and residents exposure dose in Sichuan Province from 2013 to 2020
LI Lin-yu;HE Liang-guo;Sichuan Center for Disease Control and Prevention;
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.