According to the Maritime Safety Agency, Strontium-90 and Cesium-137 density in seawater became the highest in past 40 years after 311. The sampling dates were June ~ December of 2011. They collected the seawater samples at 19 locations around in Japan. (The map below) The result showed Sr-90 and Cs-137 density significantly increased. The highest reading of Sr-90 was 30.9 mBq/L in Fukushima, which was the highest in past 40 years. The highest reading of Cs-137 was 1,225 mBq/L in … Continue reading Maritime Safety Agency, “Sr-90 and Cs-137 density in seawater became the highest in past 40 years”