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| Titel |
Does the Fukushima NPP disaster affect the caesium activity of North Atlantic Ocean fish? |
| VerfasserIn |
G. Kanisch, M.-O. Aust |
| 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. 8 ; Nr. 10, no. 8 (2013-08-13), S.5399-5410 |
| Datensatznummer |
250085292
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| Publikation (Nr.) |
 copernicus.org/bg-10-5399-2013.pdf |
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| Zusammenfassung |
| Fillet samples of marine fish collected from the East/West Greenland currents
(GC) and from the Baltic Sea (BS) have been investigated by gamma-ray
spectrometry within the regular German monitoring programme. In samples of the
second half of 2011, 134Cs traces have been detected that are suggested to
originate from the Fukushima fallout that was deposited in March/April 2011
over the northern North Atlantic and accumulated by fish. The radionuclide
134Cs (half-life 2 yr) was indeed detected with quite small
activities at about 0.0036 Bq kg−1 w.w. Existing box models
describing the transport of Cs within seawater boxes of the northeast Atlantic
allowed for estimation of 134Cs contributions from other sources, i.e.
from the Chernobyl fallout and from discharges by the two major European
nuclear reprocessing plants; both were negligible around Greenland, while
for the Chernobyl fallout a small 134Cs background contribution to BS
fish was estimated. Model results confirmed the level of 134C measured
in BS fish and showed its maximum to have occurred in winter 2011/2012
followed by a continuous decrease. It was also determined that 134Cs
activity, but not that of 134Cs, showed a significant negative
correlation with sampling depth (150–400 m) of GC fish; this strengthens
our Fukushima fallout assumption. As a result, the Fukushima fallout in
these sea areas only marginally enhanced (GC: 4%; BS: 0.1%)
pre-Fukushima levels of individual dose rates received by human fish
consumers; the addition was around 0.001 μSv following the
consumption of 10 kg of fish per year, which is not expected to cause concern
according to present guidelines for radiation protection. |
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