Radioactivity Dynamics in River System
（2014）
ＱWhat kinds of land use is radioactive cesium deposited? How much is deposited?
ＡIn the areas around Abukuma River and main river systems in Hamadori-District (east coast of Fukushima Prefecture), 70% of radioactive cesium is deposited in forests. The other radioactive cesium is deposited in mainly paddy fields and other farmlands.
Fig.1 Land use in the main river basins in the eastern part of Fukushima Prefecture
Table 1 Example for land use around main river systems in eastern Fukushima Prefecture Area and initial 137Cs deposition amount for main land uses
| Land Use | Area | Amount of initial 137Cs deposition | ||
|---|---|---|---|---|
| km2 | ％ | Bq | ％ | |
| Forest | 5,329 | 63.7 | 9.2×1014 | 70.8 |
| Paddy field | 1,157 | 13.8 | 1.6×1014 | 12.3 |
| Farmland | 852 | 10.2 | 1.3×1014 | 10.0 |
| Built-up area | 457 | 5.5 | 6.8×1013 | 5.2 |
| Others | 147 | 1.8 | 1.7×1013 | 1.3 |
| Wasteland | 152 | 1.8 | 1.6×1013 | 1.2 |
| River / Lake | 156 | 1.9 | 1.1×1013 | 0.8 |
| Road / Railway etc. | 67 | 0.8 | 1.0×1013 | 0.8 |
| Golf course | 47 | 0.6 | 3.5×1012 | 0.3 |
| Beach | 1 | 0.01 | 1.9×1011 | 0.01 |
| Total | 8,370 | ― | 1.3×1015 | ― |
Ref: M. Yamaguchi et al., J. Nucl. Fuel Cycle Env. 20, 53-70 (2013). http://dx.doi.org/10.3327/jnuce.20.53
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