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, the Nuclear Regulation Authority monitored the atmospheric radiocesium concentration as a national project to assess its temporal changes from August 2011 till November 2017. The concentration ranged from 10–1 to 100 Bq m–3 during the first two years but from 10–5 to 10–1 Bq m–3 approximately seven years following the accident. Additionally, the resuspension factor (RF) fell between 10–7 and 10–6 m–1 at the beginning of the third year but eventually declined to values between 1011 and 10–7 m–1. To investigate the effect of anthropogenic activities on the temporal change in this parameter, we categorized the monitoring data into those from within and without the entry-restricted zone. The latter exhibited a higher rate of decrease in the RF, which agrees with the previously reported data on the time dependence of the air dose rate and suggests that anthropogenic activities promote environmental remediation and reduce atmospheric radiocesium. Finally, as the rate observed in this study exceeds that reported for the Chernobyl Nuclear Power Plant accident over the corresponding period, it warrants ongoing assessment based on current monitoring data.

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

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