130,000 Bq/Kg of Iodine 131 was measured from seaweed in May of 2011
Last May, green peace had seaweed from offshore Fukushima analysed by Acro and SCK・CEN.
They measured highly concentrated Iodine 131 from the samples.
Sargassum horneri (52km South East from Fukushima plants) Iodine 131 : 119,000Bq/kg
Sargassum horneri (Ena port, 51km South West from Fukushima plants) Iodine 131 : 127,000Bq/kg
Kelp (Yotsukura port, 35km South West from Fukushima plants) Iodine 131 : 107,000Bq/kg