Japan Geoscience Union Meeting 2019

Presentation information

[J] Poster

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

[M-AG41] Dynamics of radionuclides emitted from Fukuchima Dai-ichi Nuclear Power Plant in the environment

Sun. May 26, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

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

[MAG41-P07] Eight-year monitoring study of radiocesium transfer in forest environments after the FDNPP accident

*Hiroaki Kato1, Yuichi Onda1, Zul Hilmi Saidin1, Momo Kurihara1, Tomoki Shinozuka2, Satoru Akaiwa2 (1.Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 2.College of Geoscience, School of Life and Environmental Sciences, University of Tsukuba)

Keywords:Fukushima Dai-ichi Nuclear Power Plant accident, Forest, Radiocesium

This study investigated temporal changes in 137Cs concentrations in environmental samples collected from various forests over 8 years following the accident, in Yamakiya district of Kawamata town. Cesium-137 was detected in all forest environmental samples; however, the concentration in most samples decreased exponentially with time. The decreasing trend of 137Cs concentrations varied between needles/leaves and the outer bark of Japanese cedar and konara oak trees, suggesting that self-decontamination processes and internal recycling of 137Cs varied among tree species and different tree parts. We selected a cedar stand in the highly contaminated area of Namie Town, the mechanisms of radiocesium leaching from forest canopy to rainwater and those influences to temporal trend of self-decontamination processes were examined by measuring particulate and dissolved radiocesium concentrations in throughfall.