People have been arriving at a hastily-installed testing centre in Koriyama, to find out if they have been exposed to harmful levels of radiation.
The city is the largest in Fukushima Prefecture and is only 48 kilometres away from the devastated nuclear power plant.
One woman said she was nervous, but the result was clear. She said the feeling she is left with now is anger, because if there had not been a disaster at the plant there would have been no need to be scared or get tested.
In Nigata, people have also been offered voluntary checks for radiation exposure. The city is 200 kilometres north-west of Fukushima.
Many of those who have taken up the offer are people who have been evacuated from the Fukushima area.