PROBLEM TO BE SOLVED: To provide a method for removing a radioactive substance capable of rapidly collecting and removing the radioactive substance in radioactive contaminated water.SOLUTION: A method comprises the steps of capturing free radioactive ions in radioactive contaminated water 3 using chelating agent modified gel and making alga 5 in the radioactive contaminated water 3 grow rapidly by using the gel as a nutrient.COPYRIGHT: (C)2015,JPO&INPIT【課題】放射能汚染水中の放射性物質を、迅速に回収除去する放射性物質除去方法を提供すること。【解決手段】放射能汚染水3中の遊離放射性イオンを、キレート剤修飾ゲルで取り込み、放射能汚染水3中の藻5を、ゲルを栄養素として急成長生育させるステップを含む。【選択図】図1