Case of Juman Mountain Forest Fire in 2017

（2019）

ＱHow much did the amount or the concentration of Cs released to river water by forest fire? How did them change by time?

ＡThe release rate of radioactive cesium was higher in the burned area than that previously observed. It is assumeed that the release rate becomes same level of the unburned area with the plant coverage recovering in burned area.

JAEA has observed the release of radioactive cesium about a half year from 1 month after the extinguishment.
In the result of the monitoring, the release rate of radioactive cesium was higher in the burned area than that previously observed because the plant coverage decreased in the burned area.
For the reason above, it is considered that the release rate becomes same level of the unburned area with the plant coverage recovering in burned area.

Table 1　Other data of the release observation

Place	Vegetation	Release rate (covorage)	Reference
Upper area of Uda river	Japanese red pine, ceder, broad-leaved trees, Japanese cypress	0.086～1.1％ (Coverage 5～95％)	錦織 et al., 2015
Kawamata Town	Japanese ceder	0.07％ (Coverage 95％)	Yoshimura et al., 2015
	Broad-leaved trees	0.05～0.12％ (Coverage 86～99％)	Niizato et al.,2016
	Broad-leaved trees (decontaminated)	0.84％ (Coverage 30～50％)	渡辺et al., 2019

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