Fresh fluid milk is the principal source for human ingestion of I131 resulting from nuclear testing. Data were accumulated on average daily I131 concentrations per liter of composited milk in areas monitored by the Federal-State Pasteurized Milk Network during the 1961 and 1962 periods of atmospheric nuclear testing, and estimates of I131 dosages to the thyroid gland of infants consuming such milk were made. With three exceptions, all the 12-month doses were below the Radiation Protection Guide recommended by the Federal Radiation Council for normal peacetime operations of nuclear industry. Because of wide variation of I131 in milk from different herds, some children probably received somewhat higher doses. The National Advisory Committee on Radiation has studied various countermeasures for reducing I131 exposure, and the FRC has reported on health effects.
Terry LL, Chadwick DR. Current Concepts in Radiation ProtectionPart II: Radioiodine Intake, 1961-1962. JAMA. 1964;188(4):343–350. doi:10.1001/jama.1964.03060300005001
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