| Budget Amount *help |
¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
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| Outline of Final Research Achievements |
After the accidents of Fukushima Daiichi Nuclear Power Plant, radioactive material deposited and formed locally contaminated area even in the underwater sediments. Sediment samples were collected in Dec. 2012, Sep. 2013 and Oct. 2014 from 77 sites which covers whole lake surface. Maps of radiocesium in the bottom sediment were provided in this study.
In the first observation, the concentration of radiocesium in the sediment was relatively high in the western part of the lake, and deposition at the river mouths whose watershed showed high air dose rate was found. In the second and third observations, concentrated radiocesium was mixed and moved toward the deeper layer of the sediment. Cumulated amount of radiocesium in the lake bottom was almost constant throughout the observation period.
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