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| Titel |
Spatiotemporal distributions of Fukushima-derived radionuclides in nearby marine surface sediments |
| VerfasserIn |
M. Kusakabe, S. Oikawa, H. Takata, J. Misonoo |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 7 ; Nr. 10, no. 7 (2013-07-25), S.5019-5030 |
| Datensatznummer |
250018359
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| Publikation (Nr.) |
 copernicus.org/bg-10-5019-2013.pdf |
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| Zusammenfassung |
| Spatiotemporal distributions of anthropogenic radionuclides in marine surface
sediments off Miyagi, Fukushima, and Ibaraki Prefectures were analyzed on the
basis of data collected during the monitoring program launched by the
Japanese Ministry of Education, Sports, Science and Technology in 2011 right
after the Fukushima Dai-ichi Nuclear Power Plant accident began.
Concentrations of 137Cs in the surface sediments varied spatially by two
orders of magnitude, from 1.7 to 580 Bq kg-dry−1, and there was no
obvious correlation between 137Cs concentration and the proximity of the
sampling location to the accident site. The total inventory of 137Cs
accumulated in the upper 3 cm of surface sediments in the monitoring area
was estimated to be 3.78 × 1013 Bq, that is, 0.1–2% of the
total 137Cs flux from the plant to the ocean as a result of the accident
(the percentage depends on the model used to estimate the total flux). The
spatial variations of 137Cs concentration and inventory depended on two
main factors: the 137Cs concentration in the overlying water during the
first several months after the accident and the physical characteristics of
the sediments (water content and bulk density). The temporal variations of
the concentrations of other anthropogenic radionuclides (90Sr,
95Nb, 110 mAg, 125Sb, 129Te, and
129 mTe) in the sediments were also investigated. Activity
ratios of these nuclides to 137Cs suggest that the nuclides themselves
were not homogenized before they were removed from seawater to the sediments. |
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