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.
Distribution of Exposure Dose etc(PDF 18.6KB)