The Contribution of Sources to the Sustained Elevated Inventory of 137Cs in Offshore Waters East of Japan after the Fukushima Dai-ichi Nuclear Power Station Accident
| Autor: | Masashi Kusakabe, Hyoe Takata, Naohiko Inatomi, Kazuyuki Hasegawa, Takahito Ikenoue |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Hydrology
Water Pollutants Radioactive 010504 meteorology & atmospheric sciences Meteorology business.industry General Chemistry 010501 environmental sciences Nuclear power 01 natural sciences Japan Cesium Radioisotopes Radiation Monitoring Fukushima Nuclear Accident Environmental Chemistry Environmental science Submarine pipeline Water volume business 0105 earth and related environmental sciences |
| Zdroj: | Environmental Science & Technology. 50:6957-6963 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/acs.est.6b00613 |
| Popis: | We have evaluated the contribution of sources of (137)Cs to the inventory of radiocesium in waters (surface area: 6160 km(2), water volume: 753 km(3)) off Fukushima Prefecture and neighboring prefectures from May 2011 to February 2015. A time-series of the inventory of (137)Cs in the offshore waters revealed a clearly decreasing trend from May 2011 (283.4 TBq) to February 2015 (1.89 TBq). The (137)Cs inventory about four years after the accident was approximately twice the background inventory of 1.1 TBq. The magnitudes of the (137)Cs influxes from sources into offshore waters for periods of 182-183 days were estimated from the first period (1 October 2011 to 31 March 2012: 15.3 TBq) to the last period (1 October 2014 to 31 March 2015: 0.41 TBq). We assumed that three sources contributed (137)Cs: continuous direct discharge from the Fukushima Dai-ichi Nuclear Power Station (FNPS) even after the massive discharge in late March 2011, desorption/dissolution from sediments, and fluvial input. Quantification of these sources indicated that the direct discharge from the FNPS is the principal source of (137)Cs to maintain the relatively high inventory in the offshore area. |
| Databáze: | OpenAIRE |
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