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We investigated Ocean sediments and seawater from inside the Fukushima exclusion zone and found radiocesium ( 134 Cs and 137 Cs) up to 800 Bq kg -1 as well as 90 Sr up to 5.6 Bq kg -1 . This is one of the first reports on radiostrontium in sea sediments from the Fukushima exclusion zone. Seawater exhibited contamination levels up to 5.3 Bq kg -1 radiocesium. Tap water from Tokyo from weeks after the accident exhibited detectable but harmless activities of radiocesium (well below the regulatory limit). Analysis of the Unit 5 reactor coolant (finding only 3 H and even low 129 I) leads to the conclusion that the purification techniques for reactor coolant employed at Fukushima Daiichi are very effective.

journal of radioanalytical and nuclear chemistry

Fukushima-derived radionuclides in sediments of the Japanese Pacific Ocean coast and various Japanese water samples (seawater, tap water, and coolant water of Fukushima Daiichi reactor unit 5)