5:15 PM - 6:30 PM
[MAG24-P03] Resuspension processes of Fukushima radioCs: Could fungal spore play a significant role?
Keywords:the Fukushima Daiichi Nuclear Power Plant accident, Radioactive cesium, Resuspension, Bioaerosol, Dust
Supposed that only fungal spore can carry 137Cs, estimating the 137Cs amount per spore under various assumptions; the value would be 5×10-10-3×10-7 Bq/fungal spore particle, in that case, the spore needs to be released at a rate of 9×103-5×105 particle/m2/sec from forests to support the present 137Cs in the air. This value is surprisingly 1-3 digits larger than the forest maximum value (387 particle/m2/sec) of the fungal spore emission rate given in Table 2, Sesartic & Dallafior (2011), suggesting a potentially large environmental impacts of the spore. Actually, number concentration of bio-aerosol would be reaching 5-8×105 particle/m3 in our preliminary observation during past summer in 2015 in a forest in Fukushima Prefecture, revealing that more bio-aerosol release could be occurring from Japanese forests than our expectation. Further, based on this postulation that fungal spore would be a major source of atmospheric Cs especially during summer, 137Cs concentration would be ranging 2.5×10-4-0.15 Bq/m3 air in the forest, which almost fits to the actual 137Cs concentration level shown in Fig. 1.