北京地区空气悬浮颗粒物放射性水平检测评价
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摘要
采集北京地区不同空气质量指数下的大气总悬浮颗粒物样品,用γ谱仪对样品中的放射性核素浓度进行分析,并将分析结果与空气TSP、PM_(2.5)和PM_(10)浓度数据进行关联性研究。结果表明,空气总悬浮颗粒物的采样量与空气质量有明显的强相关性,影响采样量的主要是PM_(2.5);空气总悬浮颗粒物样品的放射性水平含量均较低,7Be活度浓度范围在2.18～4.84 m Bq/m3,7Be浓度与TSP、PM_(2.5)、PM_(10)浓度相关性极弱;210Pb活度浓度范围在0.65～3.36 m Bq/m3,210Pb浓度与PM_(2.5)浓度高度正相关;40K活度浓度范围在0.149～0.395 m Bq/m3,40K浓度与粒径大于_(2.5)μm的颗粒物浓度高度正相关;其他核素结果均低于探测限。
The samples of total suspended particulates were collected under different air quality in Beijing,the concentration of radionuclides in the samples was analyzed by gamma spectrometer,the correlation between the analysis results and the concentration of TSP or PM_(2.5) or PM_(10) was studied. The results show that there is a strong correlation between the weight of total particulate sample and the air quality,and the main influence of sample weight is PM_(2.5) . The levels of The radionuclides concentration of all samples were lower. The concentration of7 Be is between 2.18 and 4.84 m Bq/m3,The correlation between the concentration of7 Be and the concentration of TSP or PM_(2.5) or PM_(10) was very weak; The concentration of210 Pb is between 0. 65 and 3. 36 m Bq/m3,The concentration of210 Pb was correlated highly positively with the concentration of PM_(2.5); The concentration of40 K is between 0. 149 and0.395 m Bq/m3,The concentration of40 K was highly positive correlated with the particle with size greater than _(2.5) μm. The results of other Radionuclides are below the detection limit.
The samples of total suspended particulates were collected under different air quality in Beijing,the concentration of radionuclides in the samples was analyzed by gamma spectrometer,the correlation between the analysis results and the concentration of TSP or PM_(2.5) or PM_(10) was studied. The results show that there is a strong correlation between the weight of total particulate sample and the air quality,and the main influence of sample weight is PM_(2.5) . The levels of The radionuclides concentration of all samples were lower. The concentration of7 Be is between 2.18 and 4.84 m Bq/m3,The correlation between the concentration of7 Be and the concentration of TSP or PM_(2.5) or PM_(10) was very weak; The concentration of210 Pb is between 0. 65 and 3. 36 m Bq/m3,The concentration of210 Pb was correlated highly positively with the concentration of PM_(2.5); The concentration of40 K is between 0. 149 and0.395 m Bq/m3,The concentration of40 K was highly positive correlated with the particle with size greater than _(2.5) μm. The results of other Radionuclides are below the detection limit.
引文
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[7]UNSCEAR 2016 Report to the General Assembly,with Scientific Annexes[R]. New York:United Nations,2017.
[2]June C E. Air chemistry and radioactivity[M]. New York:Academic Press,1963:1-382.
[3]朱厚玲,汤洁,郑向东.天然放射性核素铍-7和铅-210在大气示踪研究中的应用[J].气象科技,2003,31(3):131-135.
[4]曲松.扬尘粒径分布测试方法研究进展[A].中国环境科学学会,2014:7.
[5]白云生.美国本土地表空气中的铀浓度评估[J].国外铀金地质,2000,17(2):172-179.
[6] UNSCEAR 2008 Report to the General Assembly with Scientific Annexes[R]. New York:United Nations,2010.
[7]UNSCEAR 2016 Report to the General Assembly,with Scientific Annexes[R]. New York:United Nations,2017.