90~r_90y ~od ~urdcn ~li~tor Curves for Former Bikini Residents A statistical analysis, based on demonstrated variance in the Bikini resident’s urine activicy concentrations and on the small-~ample size, indicated that a 60-70% confidence level applies to the estimated true value for the mean body burden for adult”population groups. Children and adolescent mean body burdens were estimated at the 40-50% confidence level. In addition, post departure urine samples required a 20-fold Inrli.vidual sample increase j.nradioactivity measuremcntrs ensitivity. processing indicated 40% of the samples were below the minimum detection limit. Increased sensitivity was aci>ievedby c.ompositingthe samples. The ran~e of the post departure body burden estimate was derived from the individual urine sampl.cmeasurements and the minimum detection limit of the composite. Due to the uncertainty in measurement, the small sample size and the normal variance in urine ac~ivi.tyconcentrations, the post departure estimated true value for mean body burden does not correlate well with the expected value for adult female and child/adolescent groups.