Lingering concerns about radiation a year into the Fukushima nuclear crisis have prompted people even as far away as the Tokyo area, some 100 to 250 km from the Fukushima No. 1 power plant, to move away.

Mamiko Joosten, who has lived for seven years in Kamakura, Kanagawa Prefecture, has now decided to move to Okinawa with her 6-year-old daughter out of fear of radiation, leaving her husband behind.

"I do not want to regret later on exposing my daughter to the threat of radiation. The government's limit does not guarantee absolute safety, so I would rather choose to leave," she said.