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目的掌握昌江核电站周围环境食品放射性本底水平。方法以核电站反应堆为中心,半径10 km范围内,按当地主导风向下风向45°扇型区域内采集食品样,共8个采样点,根据当地居民饮食习惯采集4类11种食品。结果食品总α、总β均值分别为(0.643 3±0.885 1)、(24.201 3±15.779 7)Bq/kg;放射性核素主要有天然核素238U、232Th、226Ra、40K和人工核素137Cs、134Cs,平均活度分别为(0.501±0.351)、(0.561±0.884)、(0.302±0.215)、(95.870±67.814)、(0.032±0.031)、(0.042±0.059)Bq/kg;居民食入放射性核素所致年有效剂量为183.81μSv/年,其中137Cs、134Cs分别为0.18、0.03μSv/年。结论核电站环境食品总α、总β在我国食品天然放射性本底水平内,与其它地区相比处于相对低的水平;放射性核素活度水平均低于国家标准限值。
Objective To grasp the radioactive background of environmental foods around Changjiang Nuclear Power Station. Methods Taking the reactor of the nuclear power plant as the center, within the radius of 10 km, food samples were collected in a 45 ° fan-shaped area under the prevailing wind direction and downwind direction. A total of 8 sampling points were collected, and 4 types of 11 kinds of food were collected according to the local residents’ eating habits. Results The total α and total β of food were (0.643 3 ± 0.885 1) and (24.201 3 ± 15.779 7) Bq / kg respectively. The main radionuclides were 238U, 232Th, 226Ra, 40K and 137Cs, 134Cs, the average activities were (0.501 ± 0.351), (0.561 ± 0.884), (0.302 ± 0.215), (95.870 ± 67.814), (0.032 ± 0.031), (0.042 ± 0.059) Bq / The annual effective dose of nuclide was 183.81μSv / year, of which 137Cs and 134Cs were 0.18 and 0.03μSv / year, respectively. Conclusion The total α and total β of environmental food products in nuclear power plants are relatively low at the natural radioactive background level of food in China. The activity levels of radionuclides are all below the national standard limits.