2020 Fall Meeting

Presentation information

Oral presentation

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

[2A01-07] Environmental Radioactivity and Monitoring 1

Thu. Sep 17, 2020 10:00 AM - 12:00 PM Room A (Zoom room 1)

Chair:Hiromi Yamazawa(Nagoya Univ.)

11:15 AM - 11:30 AM

[2A06] Investigation on distribution of radioactive substances in Fukushima

(6)Temporal changes in reduction factors by wooden residential houses within former/current evacuation areas

*Hiroko Yoshida1, Minsik Kim2, Alex Malins2, Masahiko Machida2, Kazuya Yoshimura2 (1. Tohoku University, 2. JAEA)

Keywords:Fukushima Daiichi Nuclear Power Plant accident, reduction factor, in and around residential houses, temporal changes, former/current evacuation areas

In order to more appropriately estimate the exposure dose for residents in an existing exposure situation, it is important to evaluate air dose rates in residential houses where residents spend large portion of their time. For this purpose, it is necessary to use a proper value for reduction factor. Since 2012, we have been investigating the distribution of radioactive materials in and around residential houses for about 150 wooden houses within former/current evacuation areas, and evaluated reduction factor from the values around the houses. In this study, the dose reduction factors evaluated in 2012-2013 (before decontamination and immediately after decontamination) and those obtained in 2019 are compared, and the temporal change is reported.