About a third of the 225 youngsters who were evacuated from around the Fukushima No. 1 nuclear plant last March but still reside in the prefecture say the disaster made them aware of radiation dangers for the first time, a new survey says.

According to the results of the survey, released Sunday, the youngsters were either 11 or 14 years old.

Only three said they were mindful of radiation before the disaster, while 138 said they haven't bothered to worry about it since, according to the poll, which covered fifth-grade elementary school and second-year middle school students.