Nuclear Science and Techniques ›› 2019, Vol. 42 ›› Issue (3): 30502-030502.doi: 10.11889/j.0253-3219.2019.hjs.42.030502

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Review of the activity concentration of 14C and 210Pb in the atmosphere of Beijing by dendrochronology

Yongle WU,Bin TAN,Qiaofeng LIU,Jie HOU,Bin YANG,Huiguo YUE,Jiacheng LIU()   

  1. 1. Nuclear and Radiation Safety Center, Ministry of Environmental Protection, Beijing 100082, China
  • Received:2018-12-04 Revised:2019-01-09 Online:2019-03-10 Published:2019-03-14
  • Contact: Jiacheng LIU E-mail:liucheng@chinansc.cn;liujiacheng@chinansc.cn
  • About author:<named-content content-type="corresp-name">WU Yongle</named-content>, male, born in 1984, graduated from China Institute of Atomic Energy with a doctoral degree in 2013, focusing on radiation protection|<named-content content-type="corresp-name">WU Yongle</named-content>, male, born in 1984, graduated from China Institute of Atomic Energy with a doctoral degree in 2013, focusing on radiation protection|LIU Jiacheng, E-mail:<email>liucheng@chinansc.cn</email>
  • Supported by:
    Supported by National Natural Science Foundation of China(No.11405071);Supported by National Natural Science Foundation of China (No.11405071)

Abstract: Background

With the development of urbanization and industrialization, the ways of energy consumption and lifestyle of normal people have changed dramatically. The problem of air pollution has become increasingly prominent and has attracted widespread attention, but few studies have been reported on the effects of atmospheric radioactivity.

Purpose

This study aims at the changes of atmospheric radioactivity levels in Beijing during industrialization and urbanization by analysis of the radioactivity concentrations of 14C and 210Pb in tree rings in two areas of Beijing.

Methods

Dendrochronology was applied to reconstruction the historical concentration of 210Pb and 14C in the atmosphere of Beijing. The activity concentration of 210Pb and 14C in tree rings was measured by well-HPGe γ spectrometry and accelerator mass spectrometry, respectively.

Results

The activity concentration of 14C in poplar rings near Zicaowu in Fangshan District decreased gradually since 1977. The activity concentration of 210Pb in the rings shows an increasing trend from 1977 to 1985, followed a downward trend year by year. The activity concentration of 210Pb in phoenix tree rings near the west gates of Tsinghua University does not increase with the development of industrialization and urbanization of Beijing. On the contrary, it decreases gradually since 2007.

Conclusions

One of the main reasons for the trend of 14C activity concentration is that a large amount of carbon dioxide releases into the atmosphere due to the burning of fossil fuels during the industrialization process, and the activityconcentration of 14C is diluted. The change of the activity concentration of 210Pb in the tree rings in Fangshan district may be caused by the petrochemical processing company nearby. There is no large fossil fuel consumption plant near the West gate of Tsinghua University, which could reflect the changes of the activity concentration of 210Pb in the local atmosphere.Key words Atmospheric radioactivity, Industrialization and urbanization, Tree rings, 14C, 210Pb

CLC Number: 

  • TL99