论文部分内容阅读
目的了解2014—2015年宁夏食品中放射指标污染状况,掌握食品中放射性平均活度水平基础资料。方法主要依据《食品中放射性物质检验(总则)》(GB14883.1-94)、《高纯锗γ能谱分析通用方法》GB/T11713-2015。采用Canberra公司BE3830高纯锗γ谱仪对采集的食品中的放射指标进行检测。检测结果依据GB 14882-94《食品中放射性物质限制浓度标准》的限量规定进行评价。结果 32份样品中均未检出131I、134Cs、137Cs、60Co、58Co等人工放射性核素。其中有5份菠菜样品,全部检出了微量的人工放射性核素90Sr,检出率达100%;天然放射性核素238U、232Th、226Ra的比活度值2015年的检测结果比2014年的明显降低;天然放射性核素40K在所有被检食品中均有检出,2015较2014略有变化。结论虽然不同食品中放射性含量有一定差异,但均低于国家标准GB 14882-1994《食品中放射性物质限制浓度标准》规定的限值范围。
Objective To understand the status of radioactive contamination in food from 2014 to 2015 in Ningxia and to get basic information on the average level of radioactivity in food. The method is mainly based on “Radioactive material test in foodstuffs (General)” (GB14883.1-94), “General Method for Energy Spectrum Analysis of High-purity Germanium γ” GB / T11713-2015. Canberra’s BE3830 high purity germanium gamma spectrometer was used to detect the radioactivity in the collected food. Test results based on GB 14882-94 “limit concentration of radioactive materials in food” limit the amount of evaluation. Results No artificial radionuclides such as 131I, 134Cs, 137Cs, 60Co and 58Co were detected in 32 samples. Among them, there were 5 spinach samples, all detected a small amount of artificial radionuclides 90Sr, the detection rate of 100%; natural radionuclides 238U, 232Th, 226Ra specific activity values in 2015 test results than in 2014 obvious Decreased; natural radionuclide 40K detected in all the food were seized, 2015 slightly changed from 2014. Conclusion Although the radioactive content of different foods are different, they are all lower than the limits of GB 14882-1994, “Limits of Concentration of Radioactive Substances in Foods”.