JAEA releases new data estimating effect of measures taken to reduce radiation dose to public after nuclear accident

On Friday, the Japan Atomic Energy Agency released estimates which showed that rapid evacuations and the use of iodine pills reduce radiation exposures after a nuclear accident.  The estimates highlight special preparations for nuclear disasters which should be taken by people living within a 30-km radius of nuclear plants.

The data showed that without proper measures the population could be easily be exposed to 50 millisieverts in the first seven days — even if they were to seek indoors for two days before evacuating to outside the 30-km circle.

For those within 5 km distance

According to their findings, officials could help reduce radiation exposure to 1/100 of the level otherwise estimated would be received if they only ordered the immediate evacuation of areas within 5 kilometers of a crippled nuclear plant.

For those within 10 km distance

In areas between 5 and 10 kilometers, the dose was estimated to drop by 60%-80% if citizens remain inside concrete buildings for two days, and then evacuated.

For those within 30 km distance

For citizens within 30 kilometers of a crippled nuclear power plant who are forced to seek shelter indoors, the early intake of a stable iodine isotope 12 hours before the release of radioactive substances can help prevent thyroid levels of radiation from exceeding IAEA standards.

Source: JiJi Press

Source: The Mainichi

Source: The Japan Times


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  1. richardperrycolumbia@shaw.ca'

    Quote: “the early intake of a stable iodine isotope 12 hours before the release of radioactive substances can help prevent thyroid levels of radiation from exceeding IAEA standards”
    How is one to know when a release will happen or does everyone take stable iodine isotope every day in case. Who will supply it and when do we get it? This seems hard to manage. The 30 km range seems small as a good wind or storm could change the pattern from circular as this report assumes to 100 km by 20 km in any direction. This seems to be based on a fixed pattern type of release of radiation and I do not believe it would ever be a close circular pattern. So one can evaluate this info will you give us your assumed radiation at 1 km, 2 km, 4 km, 8 km, 16 km, 32 km ,64 km and 128 km?

  2. e.rightmyer@gmail.com'

    I concur with RichardPerry. Assuming an individual even had the preparative foresight to keep iodine tablets on hand, how could they take them 12 hours prior to a release of radioactive contaminants when the knowledge of such a release probably wouldn’t be communicated via the media about 12 hours ‘after’ such a release…if at all.

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