JpGU-AGU Joint Meeting 2026

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[J] Oral

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

[M-AG42] Environmental Radioactivity Dynamics - Challenges Following the Fukushima Daiichi NPS Accident -

Fri. May 29, 2026 3:30 PM - 5:00 PM 201A (International Conference Hall, Makuhari Messe)

Chairperson:Otosaka Shigeyoshi(Atmosphere and Ocean Research Institute, The University of Tokyo), Tsuji Hideki(Fukushima Institute for Research, Education, and Innovation)

Over fourteen years have passed since the Fukushima Daiichi Nuclear Power Station (F1NPS) accident. While the environmental dynamics of the vast quantities of radionuclides released into the environment by the accident are becoming clearer, challenges remain to be resolved, such as the transfer processes linking different spheres: atmosphere, forests, urban areas, cultivated land, rivers, groundwater, and the ocean. Research into environmental radioactivity dynamics not only contributes to preparedness for future severe accidents at nuclear facilities but also plays a vital role as a tracer for understanding environmental dynamics.
To further advance research related to the F1NPS accident, understanding the chemical reactions occurring during these transfer processes is essential. Furthermore, alongside radioactive caesium, which has been the primary focus of research to date, it is also necessary to grasp the dynamics of trace, rare long-lived nuclides and naturally occurring radioactive nuclides, and to organise these as sustainably usable radioactive isotope tracers. Furthermore, the ocean release of ALPS-treated water, being advanced as part of the F1NPS decommissioning work, is scheduled to continue for over 30 years. Continuous and highly transparent information dissemination from Japan to the international community is indispensable.
This session aims to deepen cross-disciplinary discussions on new challenges in research concerning environmental radioactivity dynamics following the F1NPS accident.

3:30 PM - 3:45 PM

[MAG42-07] Simulation study on 137Cs behavior in brackish lake, Matsukawa-ura Lagoon

★Invited Papers

*Kazuyuki Sakuma1, Toshiharu Misono1, Hironori Funaki1, Yusuke Watanabe1, Hiroshi Kurikami1,5, Susumu Yamada1, Masahiko Machida1, Kazuya Yoshimura1, Takahiro Nakanishi1, Daisuke Tsumune2,3, Hideki Tsuji4,5, Seiji Hayashi4,5 (1. Japan Atomic Energy Agency, 2. University of Tsukuba, 3. Central Research Institute of Electric Power Industry, 4. National Institute for Environmental Studies, 5. Fukushima institute for Research, Education and Innovation)

4:30 PM - 4:45 PM

[MAG42-11] Construction of Climate-Responsive Oceanic Radiological Baselines - Analysis of 137Cs Response to the Pacific Decadal Oscillation -

*Daisuke Tsumune1, Frank Bryan2, Lindsay Keith2, Kazuhiro Misumi3, Takaki Tsubono3, Yayoi Inomata4, Katsumi Hirose5 (1. Center for Research in Radiation, Isotopes, and Earth System Sciences, University of Tsukuiba, 2. NSF National Center for Atmospheric Research, 3. Central Research Institute of Electric Power Industry, 4. Research Center for the Japan Sea Region, Kanazawa University, 5. Certified Nonprofit Organization, Laboratory for Environmental Research at Mt.Fuji)

Discussion (4:45 PM - 5:00 PM)

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