Although nothing wrong was found in the health check in Fukushima, 32% of medical staff turned out to have had their thyroid irradiated at a follow-up health check.
Nagasaki University conducted Whole Body Counting (WBC) for 170 medical staff who were in Fukushima from 311 to 4/11/2011.
As a result, 55 of them (32%) turned out to have their thyroid positive for radioactive iodine.
The Fukushima Prefecture conducted health checks for the citizens after June, but they did not measure iodine from anyone supposedly.
It’s a mystery what caused this difference of the results.
Nagasaki University says, “It’s not the harmful amount of exposure.”
(Source)