Proceedings of IAHS
Proceedings of IAHS
PIAHS
Articles | Volume 381
Articles | Volume 381
https://doi.org/10.5194/piahs-381-121-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/piahs-381-121-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 381
Post-conference publication
 | 
01 Aug 2019
Post-conference publication |  | 01 Aug 2019

Time changes of dose equivalent rate above the soil surface as indication of natural attenuation processes

Alexei V. Konoplev, Toshihiro Yoshihara, and Yoshifumi Wakiyama

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Short summary
A number of sites in the Fukushima contaminated area were surveyed for long-term changes in dose equivalent rate above the soil surface during 2015–2017 using D-shuttle dosimeters. D-shuttle readings in most cases decreased faster than if due to radioactive decay only. More rapid decrease can be explained by natural attenuation processes, such as erosion of the topsoil, the vertical migration of radionuclides in the soil and the deposition of cleaner sediments transported by surface runoff.
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