Fukushima local government collected dosimeters from 25,000 children.
The average monthly dose was 120 microSv/h, but the max was 450 microSv/h.
Because even people who did not submit the dosimeter received “a result” for some reason, it’s highly likely to be manipulated as well.
450 microSv/m is known to cause severe damage to unborn babies.
According to the research of Radiation Effects Research Foundation, 0.005 Gy of total exposure increases severely intellectual disabled people by 4.4%.
(450 microSv/m = 0.005 Gy/y)
Because this is about external exposure, the actual ratio may be much more than 4.4% if they take into consideration internal exposure.