深圳近岸海域海水及沉积物中放射性核素水平

采集并分析了深圳近岸海域海水和沉积物中放射性核素的水平。结果表明,海水中226 Ra、232 Th、40 K和137 Cs的活度浓度分别为12.8~42.6Bq/m3(平均值为(24.2±8.6)Bq/m3)、3.2~15.6Bq/m3(平均值为(8.8±3.6)Bq/m3)、529.7~974.1Bq/m3(平均值为(786.4±158.4)Bq/m3)和1.7~3.7Bq/m3(平均值为(2.6±0.7)Bq/m3);沉积物中226 Ra、232 Th、40 K和137 Cs的比活度分别为17.9~35.0Bq/kg(平均值为(26.5±5.4)Bq/kg)、32.9~59.8Bq/kg(平均值为(43.2±9.1)Bq/kg)、326.2~415.3Bq/kg(平均值为(364.2±32.4)Bq/kg)和0.9~3.5Bq/kg(平均值为(1.8±0.8)Bq/kg);海水及沉积物中110 Agm的含量均低于检测限。深圳近岸海域海水和沉积物中放射性核素水平与我国其它海域相当,未见大亚湾海域海水及沉积物放射性核素含量异常。

Radionuclides in Seawater and Sediments From Near-Shore Area of Shenzhen

In this study, seawater and sediment were collected from the near-shore area of Shenzhen and analyzed for radionuclides. The results indicate that, the radioactive concentration of ²²⁶Ra, ²³²Th, ⁴⁰K and ¹³⁷Cs in the seawater are in the range of 12.8-42.6 Bq/m³ (averaged (24.2±8.6) Bq/m³), 3.2-15.6 Bq/m³ (averaged (8.8±3.6) Bq/m³), 529.7-974.1 Bq/m³ (averaged (786.4±158.4) Bq/m³) and 1.7-3.7 Bq/m³ (averaged (2.6±0.7) Bq/m³), respectively. In the sediment, the specific activity are in the range of 17.9-35.0 Bq/kg (averaged (26.5±5.4) Bq/kg), 32.9-59.8 Bq/kg (averaged (43.2±9.1) Bq/kg), 326.2-415.3 Bq/kg (averaged (364.2±32.4) Bq/kg) and 0.9-3.5 Bq/kg (averaged (1.8±0.8) Bq/kg), respectively. The radioactive concentrations of ¹¹⁰Ag^m in the seawater and sediment are all below the detection limit. The radioactive concentration of these radionuclides fall in the range of those obtained from other near-shore areas of China, and no abnormal radioactivity nuclide level are observed in seawater and sediment samples from Daya Bay.