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