SLIDE 35 Internal thyroid absorbed dose. The product of age specific intake and age specific thyroid absorbed dose per unit intake was compiled for different hypothetical ages. These results were applied to the age and location of persons exposed during the acute phase and doses to population groups are listed here. The thyroid absogbed dose from all todine and tellurium nuclides as 7.7 times the dose FUT to I at Rongelap Island for adults. It was 13, times the dose due to I at Sifo Island and 4. 7 times the dose due to I at Utirik Island. The most probable ingestion dose evaluation by James (Ja64) for a 3.5 year old Rongelap girl was given as 14.45 gray (1,445 rad). James assumed the total thyroid absorbed dose from ingesfton of all todine isotopes in fallout was 2.6 times the thyroid dose due to I. This factor is dependent upon the age of the fallout and the age of the individual and differs f5g™ ratios given here by us. Since James based the total thyroid dose on I measurements in urine and this factor of 2.6, a significant difference in thyroid dose derived from the Bikini Ash method versus the James method occurs. Several methods were used to estimate a range of fallout material ingested. One was to ingest known quantities of drug grade CaCO; with meals and subjectively arrive at similar descriptions of taste as given by the Rongelap people at the time of evacuation in March, 1954. A group of five adult white males at BNL reported that 200 mg of CaCO, when mixed with food, could not be sensed by taste at all. About 70 mg per meal were assumed to be ingested for the mean dose estimate. Another method to estimate a range of dose was to assume the range associated with the weight of the contents of the stomach in cases of sudden death (Ev66). This range, 0 to 380 grams, mean 82 grams, implies a maximum intake of ghgue 5 times the mean value. Another method was to examine the rage of Cs daily activity intake from 1957 to 1983 for Rongelap and Utirik people. The intake rate was estimated from whole-body counting results. The range of Cs intake rate was about 5 fages the mean value (Le84). Another method was to examine the range of Cs body burdens exhibited by the population inhabiting Bikini Island from 1974 to 1978 (Mi83). The range was 3.2 times the mean value. Based on the above range considerations, a value of 4 times the intake and thus 4 times the mean thyroid absorbed dose was assumed by us for estimates of maximum thyroid dose, . - Age at Exposure Total Number External Whole Body Dose Gray RONGELAP in Utero <10 3 21 19 1.9 10-18 >18 SIFo In Utero <10 12 31 1 7 >18 11 Utirik In Utero <10 8 56 10-18 >18 19 84 i) 1.9 1.1 ll 1.1 0.11 0.11 0.11 0.11 Internal Emitter Thyroid Dose Gray Internal Emitter Dose 4.5 38 8.1 8.3 15 il 1 Dose 7.7 7.7 5.0 ll 3.0 10 9.9 1,2 4.8 2.1 1.5 ll 4.9 49 4.8 4.7