A record-high 25,800 becquerels per kilogram of radioactive cesium has been detected in fish caught within 20 km of the Fukushima No. 1 nuclear plant, according to Tokyo Electric Power Co., indicating there may be hot spots under the sea that need further investigation.
That level is 258 times the government limit for safe consumption. The cesium was found in two "ainame" (greenlings) caught Aug. 1 at a depth of 15 meters, Tepco said Tuesday. It was the most cesium found among seafood samples so far.
A person could get a dose of 0.08 millisieverts by eating 200 grams of the greenlings, Tepco said. A cumulative dose of 100 millisieverts increases the risk of dying from cancer by 0.5 percent.