2021 Annual Meeting

Presentation information

Oral presentation

VII. Health Physics and Environmental Science » Health Physics and Environmental Science

[3M09-15] Environmental Dynamics

Fri. Mar 19, 2021 2:45 PM - 4:45 PM Room M (Zoom room 13)

Chair: Hiroko Yoshida (Tohoku Univ.)

3:00 PM - 3:15 PM

[3M10] Dynamics of radiocesium in Lake Pnuma on Mt.Akagi

(1)Seasonal variation on dissolved and particulate radiocesium in lake water

*YUKIKO OKADA1, Naoto Kumagai1, Haruaki Matsuura1, Shun Watanabe2, Seiichi Nohara3, Yoshikazu Kikawada4, Masanobu Mori5, Yoshitaka Minai6, Seiya Nagao7 (1. Tokyo City University, 2. Gunma Prefectural Fisheries Experiment Station, 3. National Institute for Environmental Studies, 4. Sophia University, 5. Kochi University, 6. Musashi University, 7. Kanazawa University)

Keywords:Lake Onuma on Mt. Akagi, Lake water, Radiocesium(Cs-137), Dissolved and Particulate, Re-elution

The decay of radioactive cesium in the lake water of Akagi Onuma has stopped declining since 2015. Based on the data from 2012 to 2016, we analyzed the seasonal variation of radioactive cesium contained in the dissolved state and particle state in lake water at depths of 0 m, 8 m, and 15 m. As a result, it was confirmed that more radioactive cesium was present in the suspended state than in the dissolved state at the surface layer 0 m. In addition, in the lake water at a depth of 15 m, an increase in dissolved cesium was observed around October before the full circulation period. This suggested the possibility of re-elution from the sediment.