Study on the contents of 210Po in food and estimation of the internal irradiation dose of residents / 中国辐射卫生

ABSTRACT

Objective To investigate radioactive nuclide 210Po content in the diet of residents and internal irradiation dose caused by them. Methods The major food distribution market is selected, more than 50 kinds of food samples such as meat, vegetables, fruits, aquatic products, cereals, milk are collected, the combined method ofwet ashingand metal deposition is used to measure 210Po content of food samples, and analysis of monitoring data and estimationof irradiationexposure dose of residents caused by 210Po and their relative contribution are made. Results In the food samples, the specific activity of 210Po was 8.34 mBq/kg· fresh～16.9 Bq/kg· fresh, and the content of 210Po in hairtail was higher, its value was16.9 Bq/kg· fresh, which was higher than other freshwater fish. According to the data, the annual intake of residents was 108 Bq/person, and the annual effective dose of adult caused by 210Po was 129 μSv/a.The relatively large contribution were from flour (15.2%), eggs (22.0%), aquatic products (17.1%) and vegetable oil (18.1%). Conclusion The annual intake of 210Po for residents is lower than the current limit for adults of which the value is 2 200 Bq.