Reference Material: Radiation Exposure Data for Nuclear Industry Workers (FY 2017)

The Nuclear Regulation Authority released the FY 2017 ‘Report on radiation management in nuclear facilities’ on 17 October 2018 ( This data was compiled from the section on ‘Management of radioactive waste and exposure of workers at nuclear reactor facilities for power generation, research and development facilities, fabrication facilities, reprocessing facilities, waste disposal facilities and waste management facilities.”
  In the 16 nuclear plants other than Fukushima Daiichi, a total of approximately 44,500 workers received a collective dose of 7.12 Person Sv, an average of 0.2 mSv per person. Compared to this, 13,900 workers at Fukushima Daiichi received a collective dose of 37.51 person Sv, an average of 2.7 mSv per person, a much higher exposure to radiation.
  On 6 June 2017, a plutonium release and exposure accident occurred at Japan Atomic Energy Agency (JAEA) Oarai Research and Development Center Fuel Research Building (see NIT No. 179). The 50 year committed effective dose of five exposed workers was: one received a dose of between 100 to 200 mSv, far exceeding the legal limit of 100 mSv in 5 years or 50 mSv in 1 year. Two of the workers received a dose of between 10 mSv to 50 mSv, which exceeds the recommended dose in the safety regulations of 20 mSv in 1 year or 13 m/Sv in 3 months. According to safety regulations, restrictions on radiation related work have been imposed on these three workers. The other two workers were exposed to less than 10 mSv. The exposure data for all five workers is considered to be personal information and has not been included in the table.
<Ryohei Kataoka, CNIC>
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