The maximum permissible body burden of Radium 226, 0.1 uc, increases the apparent Potassium content by 160 grams (assuming 30% Radon retention). In no person measured was there an indication that their computed value of Potassium was excessively high. Hence, in the persons thus measured there is no evidence of contamination with the gamma emitters with which we work. Summary 1. Our whole body gamma counter has been used effectively to measure humans. 2. Potassium content is approximately proportional to body weight and is Slightly greater in men than women. 3. The average Cesium content measured in people living in Salt Lake City, Utah, is higher than the average for people in other parts of the United States. 4. No evidence of radioelement poisoning has been detected in personnel at the Radiobiology Laboratory. Addendum: On April 5, 1958, it was possible to measure four adult male residents of St. George, Utah. This area is close to the Nevada Test Site and received appreciable fallout from atomic tests in 1953. Measured values are as follows: Subject Glasses of Milk upc cs}37 grams K C.G. 0 58 S.B. 2 69 L.G. 2 54 C.T. 2.5 56 AVERAGE 1.6 . -10- 59

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