Evacuees from Fukushima prefecture have been tested for exposure to high levels of radiation after the emergency at the Fukushima plant.
The plant’s operators said radiation had risen above permissible levels, although the Japanese government has played down the dangers.
With weather forecasters saying winds would continue blowing north from the Fukushima plant, people are taking no chances
The government has warned a possible meltdown process may have begun in the two quake-hit reactors, among more than 50 nuclear reactors in Japan.
Around the Fukushima sites, at least 140,000 people have been evacuated. Iodine was being distributed to protect locals against radiation.
On Saturday Japan’s nuclear safety agency said the number of people exposed could reach 160.