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Talking about Radiation

"Radiation is frightening because you can't see it, it's mysterious."
"What effect does it have on your health?"
"What about the safety of food and water?"

Since the accident at Fukushima Daiichi Nuclear Power Station, anxieties and questions of this type have been heard frequently.
With so much confusing information around, we have decided to offer some facts about the nature and effects of radiation.

Here you will find information on the meaning of terms and the units that radiation is measured in.

We are exposed to radiation every day.

Radiation and radioactivity have three main characteristics.

Radiation has an effect on the human body when a dose of more than 100 millisieverts is received all at once.

  • Overview of accident
  • The radioactive materials released by the accident
  • The level of radiation in the nearby area
  • Progress in decontamination

Food, health...... There are so many concerns

Radiation management at Hamaoka Nuclear Power Station

Strict target values have been set.

The target value for the level of radiation in the vicinity of a nuclear power station is 0.05 millisieverts per year, which is less than 1/40 of the 2.4 millisievert figure for naturally occurring radiation. Actual figures at Hamaoka are in fact significantly below this target figure. However, in order to be absolutely certain, we work to make the invisible visible, for example by constantly measuring and monitoring the level of environmental radiation, and making the results public.

We make information available to the public in real time.

To enable us to monitor the effects of radioactive materials on the environment surrounding Hamaoka Nuclear Power Station, we have set up monitoring posts at seven locations around the perimeter of the complex, and monitoring stations in 14 locations around the exterior of the complex. We also have 57 monitoring points, where we measure cumulative radiation over three-month periods.

You are able to view our monitoring data for yourself.

Monitoring post

Monitoring station