SLIDE 57 Declining continuous intake. The intake removal rate constant calculated for each nuclide in the Rongelap and Utirik adult populations is given here. In the cases of the Rongelap and Utirik people for who sequential body~burden a we avajlable he constant was fo to have a positive value for 1370," oS on, 80. 235 and s65r. The 336, data for urine of three adult males at Rongelap in 1973 and 1976provided a single tentatiye estimate. The value of the constant was 7.5 x 10 + 9.1 x10 d For Fe, only one bioassay estimate was published as a result of studies by the BNL medical program (BeZ2, Co75); thus an estimate was not possible. For the estimate of gymlated Fe intake, the constant was assumed equal to zero. Thus, for Fe, radioactive decay was assumed by us to be the only cause of reduced daily activity intake during the residence interval. 137 Where data were available for comparison, the values of the constant for Cs and Sr were found to be similar for both males and females as well as for residents of both Rongelap and Utirik. The yearly percent decrease in the atom ingestion rate was computed. A 9% reduction in dietary Cs was computed for each year at Rongelap and Ugirik. For dietary 9205p, an 8% reduction was estimated. The Co and Zn intakes were reduced rapidly during the first years post-return to Rongelap Atoll. An 80% per £gat reduction in dietary ~~Zn and a 60% per year reduction in dietary ~~Co were observed for adults. Also, for aguyyt males at Rongelap, a tentative value of 3% per year reduction in dietary Pu was estimated from sparse data. DECLINING CONTINOUS INTAKE Nuclide wo? C8 52 Sr Intake Removal Rate Constant 2.0x10% q? 2.0x104d" 1.3x10°% da? 1.7x10% d7? 55