Fig.1　Map for air dose rate (Nov.7,2014) around Ukedo River system⁷⁾

【Forest investigation】Flow from forests: Amount of cesium flowing out with soil is on average about 0.1% in a year. (Map project^1),2), F-TRACE, NIES³⁾)
【Analysis of soil flow】Outflow from other than forests: Estimated from SACT (Soil (Sediment) and Cesium (Contaminants) Transport model) (F-TRACE ⁴⁾)
【Analysis of migration in river systems】Amount of radioactive cesium flowing out from Ogaki-dam at high water level is lower than 10% of that from forests. (Data by Ministry of Agriculture, Forestry and Fisheries⁵⁾, F-TRACE⁶⁾)
【River investigation】Measured data under the Map Project in 2013¹⁾

Reference： 1) Project entrusted by Nuclear Regulatory Agency, Report on the project “Establishment of the Methods for Long-term Effect of Radioactive Materials Released form Fukushima Daiichi Nuclear Power Station, TEPCO” (2013).　2) Yoshimura, K. et al., J. Environ. Radioact., 139, pp.362-369(2015).　3) T. Nishikiori et al., J. Jpn. Forest Soc. 97, 63-69 (2015).　4) A. Kitamura et al., Anthropocene, 5, 22-31(2014).　5) Tohoku Regional Agricultural Administration Office, Ministry of Agriculture, Forestry and Fisheries “Results for Investigation of Radioactive Cesium in Ogaki-dam” (September 18, 2014).　6) H. Kurikami, et al., J. Environ. Radioact., 137, 10-17(2014).　7) Map Zoom-in Site for Radiation Distribution/ The Geospatial Information Authority of Japan