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 June 2012 to the Ministry of Health, Labor and Welfare.

- The number of workers newly engaged in June was 647. The maximum external exposure dose was 12.11mSv, and no significant value was measured for the internal exposure.

- The exposure dose status of the "workers exposed to specially high radiation dose^*" is provided separately.

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

* 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.

Attachment: Exposure Dose Distribution (PDF 18.4KB)