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目的分析浙江省主要河流的水体中放射性核素水平。方法在2011-2015年期间,在浙江省范围内采集了7条主要河流的170个样品,按照国家标准方法测定了~(40)K、Th、U、~(226)Ra、~(90)Sr、~(137)Cs等核素。结果样品中天然放射性核素~(40)K、Th、U和~(226)Ra的平均放射性浓度分别为155 m Bq/L,166μg/L,0.60μg/L和10.0 mBq/L,人工放射性核素90Sr、137Cs平均放射性浓度分别为2.6 m Bq/L和0.2 m Bq/L。结论与1983-1990年的本底调查值相比,水体中天然放射性核素~(40)K、Th、U、~(226)Ra的浓度处于正常水平,人工放射性核素~(90)Sr、~(137)Cs活度浓度在2011年福岛核事故前后基本一致。
Objective To analyze the radionuclide levels in the main rivers of Zhejiang Province. Methods During the period of 2011-2015, 170 samples from 7 major rivers were collected in Zhejiang Province. According to the national standard method, ~ (40) K, Th, U, ~ (226) Ra and ~ (90) Sr, ~ (137) Cs and other nuclides. Results The average radioactive concentrations of ~ (40) K, Th, U and ~ (226) Ra of natural radionuclides were 155 m Bq / L, 166 μg / L, 0.60 μg / L and 10.0 mBq / L, respectively. The average radioactive concentrations of radionuclides 90Sr and 137Cs were 2.6 mBq / L and 0.2 mBq / L, respectively. Conclusion The concentrations of ~ (40) K, Th, U and ~ (226) Ra of natural radionuclides in water are at a normal level compared with the background data from 1983 to 1990. The concentrations of artificial radionuclide ~ (90) Sr The ~ (137) Cs activity concentration was basically the same before and after the 2011 Fukushima nuclear accident.