|
|||||
|
|
Distribution of local Cs anomalies on the seafloor near the Fukushima Dai-ichi Nuclear Power Plant |
|
| Authors: | Blair Thornton Seiki Ohnishi Tamaki Ura Naoteru Odano Shun Sasaki Tsuneo Fujita Tomowo Watanabe Kaoru Nakata Tsuneo Ono Daisuke Ambe |
| Institution: | 1. Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan;2. National Maritime Research Institute, 6-38-1 Shinkawa, Mitaka-shi, Tokyo 181-0004, Japan;3. Fukushima Prefectural Fisheries Experimental Station, 13-2 Aza-Matsushita, Shimokajiro, Onahama, Iwaki-shi, Fukushima 970-0316, Japan;4. National Research Institute of Fishery Science, Fisheries Research Agency, 2-12-4 Fukuura, Kanazawa, Yokohama, Kanagawa 236-8648, Japan;5. Fisheries Research Agency, 15F Queen’s Tower B, 2-3-3 Minatomirai, Nishi-ku, Yokohama, Kanagawa 220-6115, Japan |
| Abstract: | An estimated 3.5 ± 0.7 × 1015 Bq of 137Cs is thought to have been discharged into the ocean following the melt down at Fukushima Dai-ichi Nuclear Power Plant (F1NPP). While efforts have been made to monitor seafloor radiation levels, the sampling techniques used cannot capture the continuous distribution of radionuclides. In this work, we apply in situ measurement techniques using a towed gamma ray spectrometer to map the continuous distribution of 137Cs on the seafloor within 20 km of the F1NPP. The results reveal the existence of local 137Cs anomalies, with levels of 137Cs an order of magnitude higher than the surrounding seafloors. The sizes of the anomalies mapped in this work range from a few meters to a few hundreds of meters in length, and it is demonstrated that the distribution of these anomalies is strongly influenced by meter scale features of the terrain. |
| Keywords: | Fukushima Dai-ichi Nuclear Power Plant Radioactive cesium Marine sediment Terrain features Towed gamma ray spectrometer |
| 本文献已被 ScienceDirect 等数据库收录！ | |