May 4, 2011
The radiation readings have risen to 100 to 1,000 times the normal level on the Pacific seabed near the crippled Fukushima Daiichi nuclear power plant, reported Japan’s Kyodo News.
The high levels of radioactive materials were detected from samples collected last Friday from the seabed at points 20-30 meters deep, according to Tokyo Electric Power Co.
The seabed samples collected 3 kilometers from Minamisoma and another 3 kilometres from Naraha, both in Fukushima Prefecture, contained 98 to 190 becquerels of radioactive iodine per kilogramme and 1,200 to 1,400 becquerels of radioactive cesium.
The normal readings for the materials can be up to several becquerels, the utility said.
TEPCO said that it believes the radioactive substances may have fallen into the sea after being released into the air from the plant or may have been carried by contaminated water that seeped from the plant.
Meanwhile, the science ministry said it had not detected radioactive substances i samples collected on Friday from the seabed at a depth of 117 meters at a point 10 km from a spot on the coast 50 km south of the Fukushima plant.