Radioactivity Dynamics in forests
（2014）
ＱIn what 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 Example for land use around main river systems in eastern Fukushima Prefecture
Table 1 Area and initial 137Cs deposition amount for main land uses
| Land Use | Area [ km2 (%) ] | Amount of initial 137Cs deposition [TBq (%)] | ||
|---|---|---|---|---|
| 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 are | 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 | 8,365 | ― | 1.3×1015 | ― |
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Reference
- Yamaguchi, M. et al, Development of a model to predict a radionuclide distribution based on soil migration after Fukushima Dai-ichi Nuclear Power Plant accident Journal of Nuclear Fuel Cycle and Environment, vol. 20, no.2, 2013, p.53-69.(In Japanese)
- Kitamura, A. et al., Predicting Sediment and Cesium-137 Discharge from Catchments in Eastern Fukushima, Anthropocene, vol.5, 2014, p.22-31.