|【Index for the temporary radioactive iodine standard values】
This index for three food categories; drinking water, milk and vegetables (except root crops and corns) based on the thyroid (equivalent) dose 50 mSv/year.
Standard is based on the circumstances that continuous intake of food that has been polluted by one event like Chernobyl
Since this idea is valid only when radioactive pollution decreases based on the half-life, such standard value does not apply for the circumstances that radioactive materials are continuously released.
In case of Fukushima, there are 4 nuclear reactors that are still releasing radioactive materials.
It can be said that total amount of the radioactive material releasing are decreasing from the day of explosion, it does not mean that it's safe to keep on consuming the polluted food or beverage.
half-life .............. ( radioactivity of a specified isotope to fall to half its original value.)
(half-lives ) ( the time required for any specified property(e.g. the concentration of a substance in the body) to decrease by half.)
【Index for the temporary radioactive caesium standard values】
Temporary standard value is set on the basis that the target value of effective dose is less than 5mSv/year.
EU deducted the standard values as of April 12th, adapting to the temporary values in Japan.
<Radioactive iodine> food for infants: 100, milk: 300, others: 2000
<Radioactive caesium> food for infants: 200, milk: 200, others: 500