Seabed samples collected some 15km from the Fukushima Daiichi nuclear plant contained 1400 becquerels of radioactive caesium-137 per kilogram, Tokyo Electric Power Company (TEPCO) said.
The level is more than 600 times higher than a maximum 2.3 becquerels per kilogram detected in the past off the northeastern prefecture of Fukushima.
The samples, taken on Friday, also contained 1300 becquerels of caesium-134 and 190 becquerels of iodine-131, according to a TEPCO statement issued late on Tuesday after the first analysis of seabed soil since the March 11 disaster.
Levels of the two materials were too low to be gauged in the past, a TEPCO spokeswoman said. The company did not say whether the levels were considered harmful.
Samples taken at another spot 20km away from the plant also showed similarly high radiation levels.
TEPCO said it would continue to examine radiation levels.
"We cannot say anything definite after just one probe. We will conduct more sample examinations and keep a watch," the spokeswoman said.
The samples were taken 20-30 metres deep and three kilometres from the coast.
The Fukushima plant has leaked radiation into air, soil and ocean since it was severely damaged by the massive quake and tsunami.
Greenpeace said on Tuesday it had begun independent tests of water samples from the ocean near Japan's crippled for radiation contamination.
The samples will be collected outside Japan's 12-mile territorial waters in line with government rules, Greenpeace said.
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