On 4 April 2011, radiation levels of 0.06 mSv/day were recorded in Fukushima city, 65 km northwest of the plant, about 60 times higher than normal but posing no health risk according to authorities.
Would you have ordered the evacuation of thousands of sick and elderly hospitalized people if they were all going to get an X-ray? a CT scan?
The amount of radiation from one adult chest x-ray (0.1 mSv). A chest CT delivers 7 mSv — 70 times as much.
0.4 mSv from a mammogram.
Radiation levels were about 2 chest x-rays every day.
6-16 mSv from CT scans.
The plant was still nowhere near under control on April 4 and needed constant attention.