[1H08-12] Environmental Safety Assessment 1

[1H11] Temporal variation of atmospheric radioactive cesium and the variation trend

Analysis of NRA’s monitoring data

*tomohisa abe¹, Kazuya Yoshimura¹, Yukihisa Sanada¹ (1. Japan Atomic Energy Agency)

Keywords:Fukushima nuclear plant accident, radioactive cesium, re-suspension factor

In this study, we analyzed the variation trend of cesium concentration in the atmosphere using a data set that the Nuclear Regulation Authority regular measured the atmospheric radioactivity after the Fukushima nuclear plant accident. In addition, we calculated re-suspension factor in Fukushima using the initial fallout map of cesium by the third airborne monitoring survey.