Radioactivity Level and Public Health Risk Assessment of Uranium in Surface Water in Sichuan Province in 2016-2021
To investigate the content of radioactive substance uranium(U)in surface water in Sichuan province,and to evaluate the health risk of residents taking U in surface water,a total of 23 monitoring sections were set up in the main surface water systems of Sichuan Province.The U radioactivity levels were detected during 2016-2021,and then the health risks of residents were assessed according to the health risk assessment model.Results showed that the radioactivity level of U in surface water in Sichuan province was 0.16～3.6 μg/L,which was all qualified according to"standards for drinking water quality"(GB 5749-2022).There was no statistical significance in the radioactivity level of U in different years and different surface waters(P＞0.05).There was statistical significance in radioactivity levels of U in different water periods(P＜0.05).The total annual effective dose caused by U intake through drinking water and water immersion was lower than 0.1 mSv in all age groups.The total carcinogenic risk for residents of all ages was 4.18 × 10-9～2.24 × 10-8,all lower than the strictest control limits issued by World Health Organization(WHO)and International Commission on Radiological Protection(ICRP).U in the main surface water bodies in Sichuan province is safe for all age groups.
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