Cooperative Field Studies on Environmental Factors Influencing I131 Levels in Milk

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Abstract
Data collected by the Division of Radiological Health, U.S. Public Health Service, were examined and showed geographic variation in radionuclide concentration in milk. These data show that milk is an excellent indicator of I131 from specific intrusions which occur anywhere in the country, depending upon meteorological and climatological conditions. Observed I131 levels in milk may be reduced by removing animals from pasture and substituting previously harvested and stored hay for contaminated pasture. More detailed studies of pasture versus stored feeding support quantitative finds in a qualitative way and indicate a period of rapid elimination (half life of 16 hr for 2 days) followed by a period of slow elimination (effective half life of about 7 days). Fertilization of pasture land can increase pasture yields and reduce radioactive concentrations in the feed and milk.

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