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目的调查某县拟建核电站周边环境放射性本底,为核电站建设提供放射性本底资料和建成后改善环境提供依据。方法采用梅花采样法以核电站拟建地址为中心,按东西南北各5、10和20 km设立13个点开展放射性元素监测。结果拟建核电站周边土壤中放射性核素钾40、钴60、镭226、钍232、铀238及人工放射性核素铯137含量均值分别为461.18 Bq/kg、未检出、29.13 Bq/kg、45.23 Bq/kg、71.36 Bq/kg和2.51 Bq/kg;空气放射本底值在(7.07~11.44)×10-8Gy/h范围内,均值为9.24×10-8Gy/h,人均年有效剂量为0.57 m Sv。结论拟建核电站周环境中放射性本底值处于较低水平。
Objective To investigate the radioactive background of the surrounding environment of a planned nuclear power station in a county, to provide radioactive background information for the construction of the nuclear power station and to provide the basis for improving the environment after its completion. Methods Plum blossom sampling method was used to monitor the radioactive elements based on the proposed address of the nuclear power plant. 13 points were set up at 5, 10 and 20 km from east, west, south and north respectively. Results The average contents of potassium 40, cobalt 60, radium 226, thorium 232, uranium 238 and artificial radionuclide cesium 137 in the soil around the proposed NPP were 461.18 Bq / kg, 29.13 Bq / kg, 45.23 Bq / kg, 71.36 Bq / kg and 2.51 Bq / kg respectively. The mean value of air emission background was (7.07 ~ 11.44) × 10-8Gy / h with mean of 9.24 × 10-8 Gy / m Sv. Conclusion The radioactive background value of the planned nuclear power plant environment is at a low level.