This is the result of the Japanese government, and the power company TEPCo, dragging their feet regarding the Fukushima Daiichi nuclear disaster: 80% of the people that used to live near the General Electric designed disaster reactors are contaminated with iodine!
The contamination was discovered after researchers tested their thyroids. At least five people have 50 millisieverts of contamination, and one person has 87 millisieverts. This study looked specifically at iodine contamination.
In February the government of Fukushima released their study, which looked at over all radiation contamination, it wasn’t good.