The serious nuclear disaster in the Fukushima Daiichi nuclear energy plant was occurred by the Tsunami on March 11, 2011. The radioactive materials leaking from the power plant were widely diffused in and around Fukushima prefecture including the Pacific Ocean by wind, rain and river flow. It can't be always said that there is no risk of the condensation of radioactive materials in human body by ecological chain if fish take in radiation in the ocean contaminated by the radioactive materials.

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... wever the decontamination is less-advanced. The establishment of a new decontamination method is urgent need. Thus, in this study, it is aimed to establish a new decontamination technology of radioactive materials deposited on seabed or lake bed. In particular, the new adsorption material which can adsorb radioactive materials is developed and the new method which can move them from the bottom sediment to the adsorption material is proposed. It is expected that the proposed method and the developed adsorption material are efficient to remove radioactive materials from seabed or lake bed when they are expansively applied to the real decontamination.