The Occurrence of Strontium-90, Iodine-131, and Other Radionuclides in Milk—May, 1957, Through April, 1958

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Abstract
Analyti-cal procedures used in the sampling of 10 milk sheds are described. The radionuclide of greatest potential hazard in milk is strontium-90, followed by iodine-131; the others are relatively unimportant. A quart of milk contains about 3.3% of the presently estimated "maximum permissible" amount of Sr , and 2.3% of the "maximum permissible" amount of I131. The amounts of Sr90 and Cs137 do not vary with concurrent weapons testing, as do Sr89, I131, and Ba40. Significant differences between Sr90 levels in various geographical locations (more than twice as much at St. Louis as in Salt Lake City) have not yet been explained.