Tomohisa Abe This email address is being protected from spambots. You need JavaScript enabled to view it., Kazuya Yoshimura, Yukihisa Sanada 

Remote Monitoring Research Group, Fukushima Environmental Monitoring Division, Collaborative Laboratories for Advaced Decomissioning Science, Japan Atomic Energy Agency, Fukushima, 975-0036, Japan


Received: November 25, 2020
Revised: February 3, 2021
Accepted: March 1, 2021

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

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Abe, T., Yoshimura, K., Sanada, Y. (2021). Temporal Change in Atmospheric Radiocesium during the First Seven Years after the Fukushima Dai-ich Nuclear Power Plant Accident. Aerosol Air Qual. Res.


  • The resuspension factor was reduced by approximately half due to human activities.
  • The reduction in the radiocesium was facilitated by anthropogenic activities.
  • The reduction of the resuspension factor was faster than that reported for Chernobyl.


After the Fukushima Daiichi Nuclear Power Plant accident, atmospheric radiocesium concentration has been monitored by the Nuclear Regulation Authority as a national project to assess its temporal change from August 2011 to November 2017. During the first two years, the atmospheric radiocesium concentration ranged from 10−1–100 Bq m−3, while concentrations of 10−5–10−1 Bq m−3 were detected about seven years after the accident. Moreover, two years after the accident, the resuspension factor (RF) ranged from 10−7–10−6 m−1 and gradually decreased to 10−11–10−7 m−1 over time. Furthermore, to investigate the impact of anthropogenic activities on the temporal change of RF, the monitoring data were classified into two groups, namely inside and outside the Fukushima entry-restricted zone. The RF decreased faster in the second than in the first group, which was consistent with the reported data on the time dependence of the air dose rate, suggesting that anthropogenic activities promote environmental remediation and reduce atmospheric radiocesium content. Besides, the observed RF reduction in this study tends to be faster than that reported for the Chernobyl Nuclear Power Plant accident for the same period. Hence, this reduction rate should be assessed based on ongoing monitoring data in the future.

Keywords: Atmospheric radiocesium, Resuspension factor, Fukushima Daiichi nuclear power plant accident, Time dependency

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