The triple disaster of the 11 March 2011 earthquake, tsunami, and
subsequent radiation releases at Fukushima Dai - ichi were, and continue to be, unprecedented events for the ocean and for society.
The additional exposures received by most Japanese people in the first year and
subsequent years due to the radioactive
releases from the accident are less than the doses received from natural background
radiation (which is about 2.1 mSv per year).