A Comparison of Uranium Cases Showing Long Chest Burden Retentions

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Abstract
Routine in vivo gamma spectrum measurements have been made to estimate internal exposure to uranium for approximately 2500 persons at the United States Atomic Energy Commission's Y-12 Plant. With only five exceptions, all cases exhibited normal elimination patterns. The five exceptions showed extended biological half lives of from 380 to 1470 days. The detection of these cases was possible because of the use of the direct-measuring technique of in vivo spectrometry. In vivo, urine and fecal data on these persons have been obtained and evaluated. The uranium urine excretion rate was found to decrease more rapidly than the chest burden. The urine and fecal elimination rate on these employees after their removal from uranium exposure was determined to be about equal.

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