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 were avajlable, the constant was fo to have a positive value for 1370," oS, adc. 33550 and S650. Th 2 8p data for urine of three adult males at Roagelap "in 1973 and 1976_grovided a spnels tentative estimate. The value of the constant was 7.5 x 10 + 9.1 x10 - For ~~Fe, only one bioassay estimate was published as a result of studies by the BNL medical program (BeZ2, Co/75); thus an estimate was not possible. For the estimate of gymulated 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 gata 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 percenf, gecrease in the atom ingestion rate was computed. A 9% reduction in dietary Cs was computed for each year at Rongelap and Yeirik. For dietary 905y, 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 year reduction in dietary “Zn and a 60% per year reduction in dietary Co were observed for adults. Also, for agygt males at Rongelap, a tentative value of 3% per year reduction in dietary Pu was estimated from sparse data. DECLINING CONTINOUS INTAKE Nuclide 709 55C5 wen Sr ose Intake Removal Rate Constant 20x10" 4” 2.0X10* a 1.3x10° d™ 1.7x10* a" _!