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Nagao , S. ., Kanazawa University, Nomi, Japan, s_nagao@llrl.ku-unet.ocn.ne.jp
Hamataka, K. ., Kanazawa University, Kakuma, Japan, hamakou1121@gmail.com
Iwata, M. ., Aquamarine Fukushima, Iwaki, Japan, iwatamasa.amf@gmail.com
Tanaka, K. ., The University of Tokyo, Kashiwa, Japan, ktanaka@aori.u-tokyo.ac.jp
Hayakawa, K. ., Kanazawa University, Kakuma, Japan, hayakawa@p.kanazawa-u.ac.jp
Yoshida, S. ., Kanazawa University, Kakuma, Japan, ysyota@stu.kanazawa-u.ac.jp
Inoue, M. ., Kanazawa University, Nomi, Japan, mutsuo@llrl.ku-unet.ocn.ne.jp
Hamajima, Y. ., Kanazawa University, Nomi, , hama@cacheibm.s.kanazawa-u.ac.jp
Yamamoto, M. ., Kanazawa University, Nomi, Japan, pluto@llrl.ku-unet.ocn.ne.jp

SPATIAL DISTRIBUTION OF RADIOACTIVITY OF CS-134 AND CS-137 IN SEAWATERS FROM COASTAL AREA OFF THE FUKUSHIMA IN JAPAN TO NORTHWESTERN PACI

Nuclear accident at the Fukushima Daiichi Nuclear Power Plant (NPP) was occurred after the 2011 Tohoku Earthquake and Tsunami. Large amount of radionuclides have also been released into the ocean area. The short and long term dispersion of radioactive cesium (Cs) in the sea has been simulated by several models and assesses the impact of radioactive pollution on living species. Therefore, it is important to understand dispersion of Cs-134 and Cs-137 in seawaters from coastal to pelagic ocean on the basis of monitoring research. The aim of this study is to describe spatial distribution of radioactivity of Cs-134 and Cs-137 in western Pacific Ocean, which ranges from 30˚N to 46˚N, and from 141˚W to 165˚W. The 15-20 L of seawater samples were collected at surface and/or down to 100 m depth during the cruises of Mirai (MR11-5), Hakuho-Maru (KH-11-7) and Tansei-Maru (KT-11-22 and KT-11-27) in 2011. The Cs-134 and Cs-137 were separated by coprecipitation with AMP and measured by gamma-ray spectrometry using low BKG Ge detector at LLRL and Ogoya URL of Kanazawa University for 1-3 days. The radioactivity of Cs-134 and Cs-137 was about 1 Bq/L for the coastal seawater samples from Onahama (36˚56’N, 140˚54’W) and almost three orders higher than those before the Fukushima accident. In this presentation, we will show you the preliminary results for spatial variation of these radionuclides in western Pacific Ocean.

Session #:088
Date: 2/21/2012
Time: 14:15
Location: Ballroom E

Presentation is given by student: No