Last May, green peace had seaweed from offshore Fukushima analysed by Acro and SCK・CEN.
They measured highly concentrated Iodine 131 from the samples.
Acro
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
SCK・CEN
Kelp (Yotsukura port, 35km South West from Fukushima plants) Iodine 131 : 107,000Bq/kg
Iori Mochizuki