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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 understand the background activity concentration of ~ (133) Xe in radioactive atmosphere in the Beijing area, and provide the basic data for the scientific evaluation of air quality and effective response to radioactive contamination of the atmosphere. Methods A total of 117 inert gas samples of xenon in the Beijing area from July 7 to October 31, 2016 were collected. The concentration of ~ (133) Xe in the sample was measured by Canberra BE3825 high purity germanium γ spectrometer. Results In 117 samples of inert gases, the apparent concentration of ~ (133) Xe was detected in 9 samples, and its activity range was 0.25 ~ 5.01 mBq / m ~ 3. 133) Xe. Conclusion The background activity level of ~ (133) Xe in the atmosphere of Beijing can be used as a reference for airborne radioactive contamination and needs continuous monitoring.