[2H05-08] Environmental Radioactivity 2

[2H06] PHITS Models for Ambient Dose Equivalent Rates in Fukushima’s Radiocesium Contaminated Forests

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

Keywords:forest, ambient dose equivalent, radiocesium, modeling, simulation, PHITS, Monte Carlo, environmental radioactivity, Fukushima Dai-ichi accident, Fukushima

PHITS Monte Carlo models were used to assess factors affecting ambient dose equivalent rates (H*(10)) in forests of Fukushima Prefecture. Models with different levels of detail were used to understand how the distribution of radioactive cesium within forests, shielding by trees, soil composition and moisture rates affect H*(10). The models were parametrized using measurements from deciduous and evergreen coniferous forests in Fukushima Prefecture.