n ps ia Figure 25 demonstrates:the external exposure following the 1958 testing se~ Since return to Rongelap followed 3 years after the BRAVO contamination, ries. _oe ny de Ft this series contributed in large part to the external exposure post return. . CS weet - The Castle BRAVO shot of March 1954 caused the contamination of the mt have included increased use of imported foods and weathering of the source. SG HBSS wee + a radioactive decay of the source and a conglomerate of other factorawhich might i- 2 Dietary decline of radioactivity included - declining continuous uptake fesine. . gsed in this analysis were representative of a ” The dosimetric models coe 1 7 +t spectroscopy and by indirect radiochemical analysis of urine and blood. ao ea my throughout the residence interval post return primarily by direct ip vivo gamna . Se Body burden data for dosimetrically significant nuclides Were obtained IRL tively. y ae 1954 and June 1957 the return of the Utirikese and Rongelapese, occurred resper- ~ eat During June wales hours after detonation and from Utirik 55 hours after detonation. wt he Evacuation from RongeLap commenced 50 wt Teeth 4 wee oe inhabited atolls Rongelap and Utirik. Seepi Ssh ety . . Le SUMMARY ee “G SS etary loss rate constants were estimated from sequential body burden data ani a were comparable for both atolls. ‘e Variation in body burden history data for a particular nuclide on @ partic- ular atoll was observed in whole body counting data and urine bioassay results. o ery m This was attributed principally to the statistical variation encountered when es small groups are sampled from a heterogeneous group of body burdens in peopl+, “s and in the case of urine bioassay additional variation was introduced during the Sy laboratory analysis of samples. Daily activity ingestion rates were determined for all measured radionuclides. In general, infants, children, and adults between 20 and 40 50 ON ai ae a ee GE teeare