We have been evaluating the exposure dose of the workers at Fukushima Daiichi Nuclear Power Station in two categories, internal and external exposure doses.

The evaluation results have been submitted to the Ministry of Health, Labor and Welfare in the order of the due dates of announcements.
(Previously announced)

Today we submitted a report on the exposure dose evaluation as of the end of May 2012 to the Ministry of Health, Labor and Welfare,

-The number of workers newly engaged in May was 602.
The maximum external exposure dose was 16.85mSv, and no significant value was measured for the internal exposure.

-The exposure dose status of the "workers exposed to specially high radiation dose^*1" is provided separately. As for the "workers applicable for the provisional measures^*2", the exposure dose status will no longer be provided as the applicable period has ended at the end of April.

The exposure dose evaluation result as of the end of June will be reported to the Ministry of Health, Labor and Welfare by the end of July.

*1 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.
*2 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.

Attachment: Exposure Dose Distribution(PDF 18.4KB)