Case of Juman Mountain Forest Fire in 2017
（2017）
ＱCs released to the environment by the forest fire?
ＡRelease of radioactive material during Juman-Mtn fire event was limited, and even if existed, the concentration in air is significantly smaller than the usual airborne dust concentration.
- Radio-cesium concentration and levoglucosan (plant combustion index) concentration in the airborne dust were analyzed.
- Levoglucosan concentration indicated high value during the fire event, but low after the event, and it reflected the effect of event.
- On the other hand, definite correlation between radio-cesium concentration and levoglucosan was not observed (highest radio-cesium concentration was found after the fire event)
⇒ Origin of radio-cesium in airborne dust is considered to be other item than the fire.
Fig.1 Cs concentration (upper fig.) and levoglucosan concentration (lower fig.) during and after the fire event
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- What is the source of radio-cesium in the airborne dust sampling?
- How much does additional internal dose exposure would be if we assume highest concentration during the fire event was exposed? How harmful for the health?
- Where were radioactive materials deposited and in what quantities?
- What kinds of radioactive materials were released into the atmosphere and the sea and how much?
- Will clean areas be contaminated due to radioactive cesium flowing out of forests?