2019 Fall Meeting

Presentation information

Oral presentation

VII. Health Physics and Environmental Science » VII. Health Physics and Environmental Science

[1D09-14] Environmental Radioacitivty and Monitoring 2

Wed. Sep 11, 2019 2:45 PM - 4:25 PM Room D (Common Education Bildg. 1F D12)

Chair:Jun Goto(Niigata Univ.)

3:45 PM - 4:00 PM

[1D13] Investigation on distribution of radioactive substances in Fukushima

(9)Analysis of temporal changes in ambient dose equivalent rates in forests over 6 years

*Alex Malins1, Naohiro Imamura2, Tadafumi Niizato1, Minsik Kim1, Kazuyuki Sakuma1, Yoshiki Shinomiya2, Satoru Miura2, Masahiko Machida1 (1. JAEA, 2. FFPRI)

Keywords:forest, environment, ambient dose equivalent, radiocesium, 134Cs, 137Cs, FDNPP accident, PHITS, Monte Carlo, Simulation

We analyzed changes in ambient dose equivalent rates (H*(10)) between 2011 and 2017 in forests in Fukushima Prefecture. PHITS was used to calculate the effect of re-distribution of 134Cs and 137Cs over time within forests on H*(10). Transfer of radiocesium from the crowns of evergreen coniferous trees to the forest floor appeared to cause slower declines in H*(10) at 1 m height initially after March 2011 than expected by the rate of radiocesium decay.

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