2016年北京地区大气中放射性惰性气体^(133)Xe的监测与分析

Monitoring and Analysis of Radioactive Noble Gas ^(133)Xe in Atmosphere in Beijing Region in 2016

目的了解北京地区大气中放射性惰性气体^(133)Xe的本底活度浓度水平,为科学评价空气质量和有效应对突发大气放射性污染提供基础数据。方法采集2016年7月7日至10月31日期间北京地区大气中的117个惰性气体氙样品,使用Canberra BE3825型高纯锗γ谱仪测量样品中^(133)Xe的活度浓度。结果在所检117个惰性气体样品中,9个样品中检测出存在明显的^(133)Xe,其活度浓度范围为0.25~5.01 mBq/m^3,其余样品中均未检测出^(133)Xe。结论北京地区大气中^(133)Xe的本底活度浓度水平可作为空气放射性污染的参考,并需进行持续监测。

Objective To study the activity concentration background of the radioactive noble gas 133 Xe in the atmosphere in Beijing,and to provide fundamental data for scientific assessment of air quality and effective reply of unexpected atmosphere radioactive contamination in Beijing.Methods A total of 117 noble gas xenon samples of Beijing were collected during the period from July to October,2016,and the activity concentrations of 133Xe were analyzed and measured with the Canberra BE3825 HPGe γspectrometer system.Results The activity concentrations of 133 Xe were detected in 9 out of 117 samples with the range of 0.25 ～ 5.01 mBq/m3,while no radioactive xenon 133Xe were detectable in the other samples.Conclusion The 133 Xe activity concentration background in the atmosphere of Beijing can be used as reference of radioactive contamination of air,and should be monitored constantly.