JpGU-AGU Joint Meeting 2020

Presentation information

[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-AG Applied Geosciences

[M-AG44] Dynamics of radionuclides emitted from Fukushima Dai-ichi Nuclear Power Plant in the environment

convener:Daisuke Tsumune(Central Research Institute of Electric Power Industry), Yoshio Takahashi(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), Yuichi Onda(Center for Research on Isotopes and Environmental Dynamics, University of Tsukuba), Kazuyuki Kita(Faculty of Science, Ibaraki University)

[MAG44-05] 237Np and Pu isotope ratios in soil, riverbed and reservoir sediments after the Fukushima accident

*Miho Fukuda1, Jian Zheng1, Shinnosuke Yamazaki1, Tatsuo Aono1 (1.National Institute for Quantum and Radiological Science and Technology, National Institute of Radiological Science)

Keywords:Fukushima Dai-ichi Nuclear Power Station accident, Neptunium, Plutonium, Caesium

In this study, we report 237Np and Pu isotopes in soil, riverbed and reservoir sediments after the Fukushima Dai-ichi Nuclear Power Station (FDNPS) accident. 237Np activities in these samles were (0.013±0.02)~(5.7±1) mBq/kg-dry and were one to three orders of magnitudes low compared to these previous reports before the FDNPS accident even considering radiation decay. 237Np activities were generally three orders of magnitude lower than those of 239+240Pu activities. We will also report 237Np and Pu isotopes activity and atomic ratio and what we learn from them and relationship between these transuranic elements and Cs isotopes.
This work was partially supported by Research and Development to Radiological Sciences in Fukushima Prefecture.