论文部分内容阅读
目的分析北京地区蔬菜和原奶样品受日本福岛核事故放射性核素污染的监测结果,评价此次核事故对北京地区食品造成的放射性污染程度。方法启动核应急监测体系,使用高纯锗γ谱仪测量系统对北京地区的蔬菜和原奶样品的放射性污染水平进行监测。结果 2011年4月2日北京通州露天荠菜样品中首次检测出微量人工放射性核素131II,2011年4月2日—6月30日采集的蔬菜样品中131I活度的最大值为海淀野草样品(3.03 Bq/kg),原奶样品中未检测到人工放射性核素。结论监测到的露天蔬菜中131I来自福岛核事故释放,远低于1986年切尔诺贝利核电站事故对北京地区造成的放射性污染程度,其对公众所致有效剂量极其微小,未对该地区居民产生明显的健康影响。
Objective To analyze the monitoring results of vegetable and raw milk samples in Beijing from the radionuclide contamination of Fukushima nuclear accident in Japan and evaluate the radioactive contamination caused by this nuclear accident to food in Beijing. Methods The nuclear emergency monitoring system was started and the radioactive contamination of vegetables and raw milk samples in Beijing area was monitored by high purity germanium gamma spectrometer measuring system. Results On April 2, 2011, a small amount of artificial radionuclide 131II was detected in the samples of open chestnut shepherd’s purse in Tongzhou, Beijing. The maximum 131I activity in vegetable samples collected from April 2 to June 30, 2011 was Haidian weed sample 3.03 Bq / kg), no artificial radionuclides were detected in the raw milk samples. Conclusions 131I was detected in the open vegetables from the release of Fukushima nuclear accident far below the level of radioactive contamination caused by Beijing’s Chernobyl accident in 1986 and its effective dose to the public is extremely small. Residents have significant health effects.