Fukushima local government published the exposure data.
Last June, they distributed the query to ask their past behavior (location, staying inside/outside) to 29,103 people in Namie machi, Iidate mura, and Kawamata machi of Fukushima.
13,945 people ignored it and they managed to get the result of 10,468 people, from March to July.
The data shows
0~9 years old child had 8~9 mSv of external exposure from June to September.
10~19 years old child had more than 15 mSv of external exposure from June to September.