1. Chino M., Nakayama H., Nagai H., Terada H., Katata G. and Yamazawa H. (2011) Preliminary estimation of release amounts of 131I and 137Cs accidentally discharged from the Fukushima Daiichi Nuclear Power Plant into the atmosphere. J. Nucl. Sci. Technol., 48(7), 1129-1134.
2. FFPRI (2012) 8 ~ 10 Gatsuniokeru Keiryusuichuno Hosyaseibusshitsuno Kansokukekka (Observations of radioactive substances in stream water in August-October. Forestry and Forest Products Research Institute), Tsukuba, Japan. http://www.ffpri.affrc.go.jp/press/2012/20121220/ (accessed January 24, 2015). (in Japanese)
3. IAEA (2006) Environmental consequences of the Chernobyl accident and their remediation: twenty years of experience. International Atomic Energy Agency, Vienna, Austria. http://www-pub.iaea.org/mtcd/publications/PDF/Pub1239_web.pdf (accessed January 24, 2015).
4. JMA (2015) Kisyodeta (Meteorological data). Japan Meteorological Agency, Tokyo, Japan. http://www.jma.go.jp/jma/ (accessed January 24, 2015). (in Japanese)
5. Kubota T., Hitomi T., Hamada K., Yoshioka K., Sato M. and Saito T. (2013) Removal of radioactive Cs from irrigation water at the inlet of a paddy field using chaff or other materials. Tech. Rep. Nat. Inst. Rural Eng., 214, 123-133. (in Japanese)