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Baumann, Z. A., Stony Brook University, Stony Brook, USA, zosia@ravenblond.com
Baumann, H. ., Stony Brook University, Stony Brook, USA, hbaumann@ms.cc.sunysb.edu
Nishikawa, J. ., University of Tokyo, Tokyo, Japan, jn@aori.u-tokyo.ac.jp
George, J. ., Stony Brook University, Stony Brook, USA, jennifer.ayako.george@gmail.com
Miyamoto, H. ., University of Tokyo, Tokyo, Japan, miyamoto@aori.u-tokyo.ac.jp
Buesseler, K. O., Woods Hole Oceanographic Institution, Woods Hole , USA, kbuesseler@whoi.edu
Fisher, N. S., Stony Brook University, Stony Brook, USA, nfisher@notes.cc.sunysb.edu

BIOACCUMULATION BY ZOOPLANKTON AND MICRONEKTONIC FISH OF FUKUSHIMA RELEASED CESIUM AND SILVER RADIOISOTOPES IN JAPANESE COASTAL WATERS

The release of radioactive material from the damaged Fukushima Dai-ichi nuclear power plant into the ocean has raised concerns of possible radionuclide bioaccumulation in marine organisms. Here we present the first gamma analyses of biological samples collected in June 2011 as part of an international survey to Japanese waters. Bulk samples of zooplankton (>0.3mm) and micro nekton communities (>4mm) were obtained by oblique tows using Bongo and Methot nets. Biota concentrations of the released 137Cs, 134Cs and 110mAg were compared to 40K and other natural radionuclides. 137Cs, 134Cs and 110mAg were highest for samples collected nearest to the coast, and were higher for bulk zooplankton than for micronektonic fish, with concentrations up to 35 mBq g-1 dry wt. Concentration factors of Cs in zooplankton were comparable to those determined in other ocean regions. The 134Cs:137Cs ratios were ~1, consistent with values reported for ratios in the plant’s effluent and ambient surface water concentrations. Gamma radioactivity from naturally occurring radionuclides, primarily 40K, exceeded that from artificial radionuclides by about two orders of magnitude.

Session #:088
Date: 2/21/2012
Time: 12:00
Location: Ballroom E

Presentation is given by student: No