The main pathway for thyroid exposure was cows grazing on contaminated grass, and incorporating the iodine into milk that was fed to children.
2.
The results of a scientific survey conducted in March show that about 45 percent of 1, 080 children in three Fukushima communities tested positive for thyroid exposure to radiation.
3.
And another government agency, a branch of the Public Health Service, studying thyroid exposures around a government nuclear bomb factory at Hanford, Wash ., has recommended medical monitoring for adults who absorbed 10 rads or more as children.
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