Accumulated contamination of Fukushima workers is still high

Tokyo Electric Power Company (TEPCO) said on March 1 that the cumulative radiation exposure of workers at the Fukushima No.1 Nuclear Power Plant for a period of one year from March 2012 was four times higher than with before the disaster in March 2011.

The total number of workers' exposure doses is displayed in units of 'man-sievert .' According to TEPCO calculations, cumulative exposure doses from March 2012 to January 2013 amounted to 60.1 man-sievert. or the average annual exposure of 65.6 man-sievert, which is four times higher than the 14.9 man-sievert measured in 2009.

Workers check the reactor indicators at Fukushima Nuclear Power Plant 1.

Compared to 246.9 man-sievert in the first year from March 2011 to February 2012, the second year fell to just one-fourth the first year after the disaster. However, this level is still high compared to the specified level in other commercial nuclear power plants in Japan, currently at 46.3 man-sievert in fiscal year 2011.

At the Fukushima nuclear complex, the average exposure dose was about 12,100 workers at 4.6 millisievert (mSv) during the period from April 2012 to January 2013, while the highest dose of them reached 46, 59mSv.

The maximum radiation dose for power plant workers is 100mSv within 5 years and 50mSv / year. However, the annual allowable exposure limit was pushed to 250mSv after the March 2011 disaster, but it was brought back to 50mSv in December 2011.