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information about Fukushima published in English in Japanese media info publiée en anglais dans la presse japonaise

Workers exposure doses

June 30, 2014

Press Release (Jun 30,2014)Exposure dose of Evaluation of the Workers at Fukushima Daiichi Nuclear Power Station



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 have submitted a report on the exposure dose evaluation as of the end of May 2014 to the Ministry of Health, Labor and Welfare.

-The number of workers newly engaged in May was 822 persons. The maximum external exposure dose to those workers engaged in the operation in May was 20.70 mSv, and no significant value was measured for the internal exposure.

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

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 2014.

* 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.

To see table of exposure dose distribution :




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