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. Eight sites in the Fukushima contaminated area weresurveyed for long-term changes in D-shuttle dose equivalent rate above thesoil surface during 2015–2017. D-shuttle readings in most cases decreasedfaster than if due to radioactive decay only. More rapid decrease can beexplained by natural attenuation processes, such as erosion of the topsoil,the vertical migration of radionuclides in the soil and the deposition ofcleaner sediments transported by surface runoff. According to the timedependencies of D-shuttle dose rate readings integral rate constants of thenatural attenuation were estimated using the exponential trend-line.Estimated rate constants of natural attenuation ranged from 7.3×10-3 to 0.48 yr−1, while the correspondent ahalf-dose rate decrease was 1.4–95 years.

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