Siyu HUANG, Wuhui LIN, Xianwen HE, Xiaodong LIN. Spatiotemporal characteristics and mechanisms of 7Be and 210Pb in the atmosphere[J]. NUCLEAR TECHNIQUES, 2025, 48(3): 030301
- NUCLEAR TECHNIQUES
- Vol. 48, Issue 3, 030301 (2025)
Fig. 1. Seasonal variation trends of 7Be activity concentration (a) and 210Pb activity concentration (b) in Nanning city (yellow area: winter-spring, December-May; green area: summer-autumn, June-November; red solid line: winter-spring average; blue solid line: summer-autumn average) (color online)
Fig. 2. Box plots of seasonal variations in activity concentrations of 7Be (a) and 210Pb (b) in Nanning city (The highest values of 7Be and 210Pb are in spring and winter, respectively)
![Distribution of 7Be and 210Pb sampling sites in 17 areas of China [Revision Number: GS(2016)1609]](/Images/icon/loading.gif){kind=icon}
Fig. 3. Distribution of 7Be and 210Pb sampling sites in 17 areas of China [Revision Number: GS(2016)1609]
Fig. 4. Box plots of seasonal averages of 7Be (a) and 210Pb (b) activity concentrations in 17 areas of China (source areas for the 7Be mean include Mt. Waliguan[12], Mt. Guanfeng[13], Mianyang[14], Beijing[15], Qingdao[16], Lanzhou[17], Xi'an[18], Hefei[19], Wuhan[20], Kunming[21], Guangzhou[22], Shenzhen[23], Nanning; source areas for the 210Pb mean include Mt. Waliguan[24], Mt. Guanfeng[13], Beijing[15], Hefei[19], Mianyang[14], Shanghai[25], Wuhan[20], Hangzhou[26], Kunming[21], Guangzhou[22], Shenzhen[27], Nanning; the highest values of 7Be and 210Pb are in spring and winter, respectively)
Fig. 5. Changes of monthly mean activity concentrations of PM2.5 and PM10 in Nanning city from February 2014 to November 2023(blue area: winter, December-February; green area: spring, March-May; red area: summer, June-August; yellow area: autumn, September-November) (color online)
Fig. 6. Correlation analyses between 7Be and PM2.5 (a), 7Be and PM10 (b), 210Pb and PM2.5 (c), 210Pb and PM10 (d) (color online)
Fig. 7. Correlation analyses between 7Be and O3 (a), 210Pb and O3 (b) (color online)
Fig. 8. 7-day inverse trajectory clustering map of winter and summer air mass sources in Nanning City in 2021 (dashed line is the inverse trajectory; solid line is the result of clustering analysis; red is the winter from December 2021 to January 2022; blue is the summer from June to August 2021) (color online)
Fig. 9. Box plots of 210Pb activity levels in 14 areas (Beijing[15], Qingdao[40], Mt. Waliguan[24], Hefei[19], Mianyang[14], Shanghai[25], Wuhan[20], Hangzhou[26], Mt. Guanfeng[13], Kunming[21], Xiamen[35], Guangzhou[22], Shenzhen[27], Nanning) of China (red area: area north of about 40°N; green area: areas south of about 40°N) (color online)
Fig. 10. Box plots of 7Be activity levels in 14 areas (Mt. Waliguan[41], Mt. Guanfeng[13], Mianyang[14], Beijing[42], Qingdao[16], Lanzhou[17], Xi'an[18], Hefei[19], Wuhan[20], Kunming[21], Xiamen[35], Guangzhou[22], Shenzhen[23], Nanning) of China: (a) Box plot of 7Be activity levels in areas subject to latitudinal effects; (b) Box plot of 7Be activity levels in areas subject to altitudinal effects (red areas: areas north of about 35°N; green areas: areas south of about 35°N; blue areas: areas subject to altitudinal effects) (color online)
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Table 1. Annual cumulative effective doses of 7Be to humans in 17 areas of China
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Table 2. Annual cumulative effective doses of 210Pb to humans in 17 areas of China
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