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 1350," oS. dee 2355 nd 565. The 338 data for urine of three adult males at Rongelap in 1973 and 1976_provided 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 (Be{2, 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 Ronge Lap and Yeirik. For dietary ~~Sr, 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 reduction in dietary Zn and a 60% per year reduction in dietary observed for adults. Also, for agyge males at Rongelap, a tentative value of 3% per year reduction in dietary Pu was estimated from sparse data. DECLINING CONTINOUS INTAKE Nuclide Intake Removal Rate Constant 2Co 2.0x10% 47 nen 1.3x10°% da! C8 Sr year Co were 2.0x10%d! 1.7104 a7 55