so te * body burden méans for edults:on Utirik and the observed K, rate ‘constant from Rongelap. | It was observed on Rongelap that .031% of 65 “Zn diet pathway each day in addition to radioactive decay. was removed from tle Additionally, reduciion pee - 137 in dietary radioactivity on Rongelap had been observed for ~ Cs, to be greater than that predicted by radioactive decay alone. 90 Sr, and 8005 Instantaneous re- duction fractions very.slabipe&6) phbde! gtBonga apvere joobserved at Utirik for the sr, and 137 c4 nuclides. The lower curve pn‘Pigure/16: reflects the dose equivalent, dose equivalent rate, and body burden which yould have occurred liad radioactive decay alone accounted: forithe removal of a from the Utirik envi i ronment. Since additional!mechanisus could be measured for other nuclides at AAV \MI y poe Utirik and for the 6575 nuclideon a nearby ato}l,* the upper,curve was chosen as the most likely body burden history for adults post return Utirik Atoll. Figure 17 indicates the Ucirik adult mean total body gue equivalent rate for each nuclide. An obvious difference relative to the Rongelap history exists; 6575 not 1370, was the major nuclide contributing to the dose equivalent rate, This was due to the Utirik population returning 3 to 4 months after the initial contaminating event, and the Rongelap population returning after 3 years. The age of the fallout had a dramatic influence on the importance of each nuclide contributing to the internal dose equivalent. In face 600, and 655, played major roles during the first 3 years, a time interval that QB were being developed at Brookhaven National Laboratory and when medical exaiina- td tions for people on Uririk Atoll were not done. Additionally, pooled and/ur in- eat corresponded to the period during which field whole body counting facilities dividual radiochemical analysis of urine was not performed during this periad. . The impact of 65 . . ?2n and 6005 was such that even if the least conservative rate 14 CORE LL A ater ee eg eee . the