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| Titel |
Resuspension of deposited radioactive material from the Fukushima Daiichi NPP site |
| VerfasserIn |
Georg Steinhauser, Tamon Niisoe, Kouji H. Harada, Katsumi Shozugawa, Stephanie Schneider, Hans-Arno Synal, Clemens Walther, Marcus Christl, Kenji Nanba, Hirohiko Ishikawa, Akio Koizumi |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250123281
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| Publikation (Nr.) |
 EGU/EGU2016-2508.pdf |
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| Zusammenfassung |
| Releases of radionuclides from the Fukushima nuclear accident are typically associated with
the atmospheric discharges in the early phase of the accident in spring 2011. Analysis of
weekly air filters, however, has revealed sporadic releases of radionuclides long
after the Fukushima Daiichi reactors were stabilized. One major discharge was
observed in August 2013 in monitoring stations in the Minamisoma area north of
the Fukushima Daiichi nuclear power plant (FDNPP). During this event, an air
monitoring station in this previously scarcely contaminated area suddenly reported 137Cs
activity levels that were 30-fold above the background. Together with atmospheric
dispersion and deposition simulation, radionuclide analysis in soil indicated that
debris removal operations conducted on the FDNPP site on August 19, 2013 are
likely to be responsible for this late release of radionuclides. One soil sample in
the center of the simulated plume exhibited a high 90Sr contamination (78 ± 8
Bq kg−1) as well as a high 90Sr/137Cs ratio (0.04); both phenomena have usually
been observed only in very close vicinity around the FDNPP. We estimate that
through the resuspension of highly contaminated particles in the course of these
earthmoving operations, gross 137Cs activity of ca. 2.8 × 1011 Bq has been released. |
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