We have been evaluating exposure dose of the workers at Fukushima Daiichi 
Nuclear Power Station in two categories, or "Internal exposure" as well 
as "External exposure" doses. 
 
The results have been submitted to the Ministry of Health, Labor and 
Welfare in the order of the due date and announcements were at each time. 
                                (Previously announced on January 31, 2011) 
 
Today we submitted a report regarding the exposure dose evaluation as of 
end of January, 2012 to the Ministry of Health, Labor and Welfare, 
 
-The number of newly engaged workers in January was 587, of which the 
 maximum external exposure dose was 18.98 mSv, while no significant value 
 was measured for the internal exposures 
-We have reprinted the exposure dose states of "Specific high radiation 
 dose workers" and "Provisional measures applied workers". 
 
By March 30, we will report to the Ministry of Health, Labor and Welfare, 
regarding the status of exposure dose evaluated as of end of February. 
 
* The workers who applied Emergency dose limit (100mSv) shown in 
 "Ordinance on Prevention of Ionizing Radiation Hazards, chapter 7." 
 Specifically, it means the workers who engaged in the work to maintain 
 the function that cooling reactor facility or spent fuel tank at the area 
 where the radiation dose exceed 0.1 mSv /h and reactor facility, steam 
 turbine and related facilities and surrounding area in the power plant or 
 the work to maintain the function to control or prevent release of huge 
 amount radioactive material due to trouble or break of reactor facility. 
 
* The workers who are applied dose limit (250mSv) based on ministerial 
  ordinance relating to special provision of "Ordinance on Prevention of 
  Ionizing Radiation Hazards, chapter 7" until April 30, 2012 even after 
  repealing of the ministerial ordinance on December 16, 2011. 
 
<Annex> 
 Distribution of Exposure Dose etc(PDF 18.6KB)