Page 2 In addressing the first of these questions, data presented to the TTG indicated that plutonium burdens of Bikini residents were 10 times greater than plutonium levels considered typical of residents of the continental United States. These estimates were derived from plutonium analysis of urine samples from Bikini residents and from residents of New York City. Unfortunately, the validity of both these sets of urine data is subject to question. The New York City data, based on pooled samples, were not confirmed by a carefully collected large sample from one individual. This individual single sample was 10-fold lower than the pooled samples, and is in agreement with model estimates based on fallout plutonium burdens from autopsy data. The Bikini data are highly suspect because the samples were not collected in a manner to avoid possible contamination of urine by plutonium- contaminated soil on the body and clothing of the person providing the sample, or from resuspended plutonium-contaminated soil in the air. Also, urine samples were generally pooled which prevented identification of possible sampling descrepancies. The TTG concludes that the first question cannot be answered with available data and recommends that an effort be made to obtain urine samples from selected representative residents of Bikini under carefully controlled