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Report No.

Investigation on distribution of radioactive substances in Fukushima, 9; Analysis of temporal changes in ambient dose equivalent rates in forests over 6 years following the FDNPP accident

Malins, A.  ; Imamura, Naohiro*; Niizato, Tadafumi ; Kim, M. ; Sakuma, Kazuyuki  ; Shinomiya, Yoshiki*; Miura, Satoru*; Machida, Masahiko 

We analyzed changes in ambient dose equivalent rates ($textit{.{H}}$*(10)) between 2011 and 2017 in forests in Fukushima Prefecture. PHITS was used to calculate the effects of changes in the distribution of $textsuperscript{134}$Cs and $textsuperscript{137}$Cs within forests on $textit{.{H}}$*(10). The transfer of radiocesium from the crowns of evergreen coniferous trees to the forest floor appeared to cause slower decreases in $textit{.{H}}$*(10) at 1 m height in early years than expected by the rate of $textsuperscript{134}$Cs and $textsuperscript{137}$Cs decay.



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