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目的调查桃花江核电站周边地区食品中放射性核素含量的本底水平,为评价核电站运行后可能对周边食品的影响提供参考数据。方法采集桃花江核电站周边地区典型食品为样品,依据标准方法进行样品预处理,并采用HPGe-γ谱仪进行检测分析。结果分别对14个样品中的9种放射性核素进行了检测,可检出的核素~(238)U、~(232)Th、~(226)Ra、~(40)K和~(137)Cs的活度浓度范围分别为(0.0~7.0×10~(-1))、(0.0~3.7×10~(-1))、(0.0~4.4×10~(-1))、(2.6×10~1.6×10~2)和(0.0~1.6×10~(-1))Bq/kg,均值分别为9.6×10~(-2)、1.5×10~(-1)、1.6×10~(-1)、1.0×10~2和3.0×10~(-2)Bq/kg;所致人均年有效剂量分别为4.0×10~(-1)、1.6、2.3、3.8×10和6.4×10~(-2)μSv/a。结论桃花江核电站周边20km范围内所检食品的放射性核素活度浓度在我国本底地区范围内,所致人均年有效剂量属于正常水平。
Objective To investigate the background level of radionuclide content in foodstuffs in the surrounding areas of the Peach River NPP and provide reference data for evaluating the possible impact on peripheral foods after the operation of nuclear power stations. Methods Typical food from the surrounding area of Taohuajiang Nuclear Power Station was collected as sample and pretreated according to the standard method and detected by HPGe-γ spectrometer. Results Nine kinds of radionuclides were detected in 14 samples respectively. The available radionuclides were ~ (238) U, ~ (232) Th, ~ 226, ~ 40 and K ) Activity range of Cs was 0.0 ~ 7.0 × 10 ~ (-1), 0.0 ~ 3.7 × 10 ~ (-1), 0.0 ~ 4.4 × 10 ~ (-1) × 10 ~ 1.6 × 10 ~ 2) and Bq / kg (0.0 ~ 1.6 × 10 ~ (-1)) respectively with the mean values of 9.6 × 10 -2, 1.5 × 10 -1 and 1.6 × 10 ~ (-1), 1.0 × 10 ~ 2 and 3.0 × 10 ~ (-2) Bq / kg, respectively. The annual effective dose per capita was 4.0 × 10 -1, 1.6, 2.3, 3.8 × 10 and 6.4 × 10 ~ (-2) μSv / a. Conclusions The radionuclide activity concentration of foodstuffs inspected within 20km around the Taohuajiang Nuclear Power Station is within the range of the background area of China. The annual effective dose per capita is normal.