For decommissioning of Fukushima Daiichi Nuclear Power Station (FDNPS), it is one of the biggest problems to treat the radioactive contaminated stagnant water in the building. It is difficult to remove H-3 from the contaminated water by only Advanced Liquid Processing System (ALPS) treatment. Thus, the Japanese Government announced to release the ALPS treated water containing H-3. To predict the alteration of the dose rate of the marine biota by the change of H-3 concentration in marine water after the release of ALPS water, it is necessary to understand the dynamics of H-3 in marine ecosystem and this nuclide pre-release level. In this study, we evaluated H-3 the marine biota around in the waters off Aomori and Iwate prefectures from 2003 to 2012, as the background data of the Pacific Ocean near North East Japan. In this study, the concentration of H-3 in seawater, tissue free water tritium (TFWT) and organically bound tritium (OBT) were measured. Concentration Ratio (CR), the ratio of the concentration of marine biota and seawater for TFWT, was almost 1.0, meaning the concentration of H-3 in marine biota was almost equal to seawater.

Primary Presenter: Satoru Ohtsuki, Fukushima University (s2271003@ipc.fukushima-u.ac.jp)

Authors:

Satoru Ohtsuki, Fukushima University  (s2271003@ipc.fukushima-u.ac.jp)

Yuhei Shirotani, Marine Ecology Research Institute  (shirotani@kaiseiken.or.jp)

Hyoe Takata, Fukushima University  (h.takata@ier.fukushima-u.ac.jp)