| Li Lifan,Fan Xuebo,Li Huiping,et al.Analysis of variations in activity concentrations of 7Be, 137Cs and 210Pb in the air in Beijing[J].Chinese Journal of Radiological Medicine and Protection,2024,44(8):669-674 |
| Analysis of variations in activity concentrations of 7Be, 137Cs and 210Pb in the air in Beijing |
| Received:September 11, 2023 |
| DOI：10.3760/cma.j.cn112271-20230911-00084 |
| KeyWords:Air Beijing Activity concentration Meteorological parameters Correlation |
| FundProject: |
| Author Name | Affiliation | E-mail | | Li Lifan | China Institute of Atomic Energy, Beijing 102413, China
Nuclear and Radiation Safety Center of Beijing, Beijing 100089, China | | | Fan Xuebo | Beijing Meteorological Observation Center, Beijing 100176, China | | | Li Huiping | Nuclear and Radiation Safety Center of Beijing, Beijing 100089, China | 2228357247@qq.com | | Liu Qingyun | Nuclear and Radiation Safety Center of Beijing, Beijing 100089, China | | | Lyu Xuya | Nuclear and Radiation Safety Center of Beijing, Beijing 100089, China | | | Liu Hui | Beijing Emergency Medical Center, Beijing 100031, China | |
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| Abstract:: |
| Objective To discusses the variations of 7Be, 137Cs and 210Pb activity concentrations in the air in Beijing from March 16, 2021 to March 31, 2023, and their correlation with temperature, precipitation, relative humidity, barometric pressure, PM10 (only limited to 137Cs) and other meteorological parameters. Methods A total of 60 aerosol samples were collected using the HRHA01-SFS1000/A ultra-large flowair sampler in the automatic radiation monitoring station. The activity concentrations of 7Be, 137Cs and 210Pb in the aerosol samples were measured by GMX-60 low background anti-Compton high purity germanium gamma spectrometer. Pearson correlation coefficient was used to show the correlation of the relevant parameters. Results The seasonal mean values of 7Be activity concentration were spring 4.31 mBq/m3, summer 3.53 mBq/m3, autumn 3.09 mBq/m3 and winter 2.45 mBq/m3, respectively, ranging from 1.17 to 7.79 mBq/m3, with the overall mean of (3.36±1.33) mBq/m3. The activity concentration of 137Cs ranged from 0.39 to 8.49 μBq/m3, with an average of (0.59±1.47) μBq/m3. The average activity concentrations of 210Pb were spring 0.53 mBq/m3, summer 0.44 mBq/m3, autumn 0.72 mBq/m3 and winter 0.75 mBq/m3, respectively, ranging from 0.21 to 1.36 mBq/m3, with an average of (0.56±0.26) mBq/m3. The activity concentration of 7Be was correlated with temperature and pressure (r=0.38, -0.40), the activity concentration of 137Cs was correlated with precipitation (r=-0.41), and the activity concentration of 210Pb was correlated with temperature and pressure (r=-0.31, 0.37). The variation of 137Cs activity concentration in the air showed an obvious seasonal pattern, and the peak value generally appears in spring of each year (March to May), which was related to the frequent spring dust in Beijing. The activity concentration of 210Pb in the air was affected by coal combustion heating in winter, and has a peak value during November to March. Conclusions The activity concentrations of 7Be, 137Cs and 210Pb in the air in Beijing are within the normal range, showing a seasonal trend. |
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