東京電力福島第一原子力発電所から放出された海の放射能汚染水は、２０１４年３月には薄まりつつ日本から約５３００キロ離れたハワイ諸島近くに到達することが日本原子力研究開発機構のシミュレーション結果でわかった。海水から受ける被曝（ひばく）量は低いという。原子力機構の小林卓也研究副主幹らが原発の放水口付近の海洋での放射能の実測値などをもとに、昨年３月２６日以降に直接海に流出した放射能量を推定した。これとは別に、大気から降下した放射能量もシミュレーションで推定した。
試算によると、福島第一原発から海へ直接放出された汚染水の放射能量は放射性のヨウ素とセシウム合わせて計１京８千兆ベクレルに上るという。
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