JpGU-AGU Joint Meeting 2020

Presentation information

[J] Poster

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-P03] Contribition of bioaerosols to the atmospheric resuspension of radioactive cesium in summer and autumn

*Kazuyuki Kita1, Naho Hayashi1, Koutaro Minami1, Teruya Maki2, Kentaro Hosaka3, Yasuhito Igarashi4 (1.Faculty of Science, Ibaraki University, 2.Kanazawa university, 3.National musium of nature and science, 4.Institute for Integrated Radiation and Nuclear Science, Kyoto University)

Keywords:radioactive cesium, atmospheric resuspension, bioaerosols

Radio-cesium emitted by the TEPCO FDNPP accident has been deposited on soil and vegetation after transpiration in the atmosphere. Re-suspension of the deposited radio cesium is increased atmospheric concentration of its radioactivity even now. Quantitative understanding of re-suspension processes of radio-cesium is essential for the modelling of radio-cesium transition from soil and vegetation via the atmosphere.
Our group showed the seasonal variation of atmospheric radio-cesium sampled in a polluted area in Fukushima (Kinase et al., 2018) and possibility that bioaerosols such as fungal spores bring radioactive cesium into the atmosphere especially in summer and autumn near forest area (Igarashi et al., 2019). In this study, quatitative estimation of contribution of bioaerosol to the atmospheric resuspenstion of atmospheric radio-cesium.
Atmospheric radio-cesium samples were obtained at a site in polluted area in Fukushima in september, 2017, on a quartz fiber filters using high volume air samplers. The radioactivty were measured with Ge-detercters, and number and volume of bioaerosols were estimeted using optical/fluorescence microscope. Radioactivity of cesium included in fungal spore was measured with fungi sampled around the observation sites. The atmospheric radio-cesium activity showed a good positive colleration with the nu,ber and volume of the bioarerosols.