Table 21 Radioiodine and Radiotellurium Thyroid Absorbed-Dose Commitment per Unit Activity Intake and Corresponding Age rad uci7l4 Age 135, 134, 133, 132, 131, 132,, 131m, Adult Male Adult Female 0.056 0.067 0.0025 0.0035 0.26 0.31 0.013 0.015 1.4 1.7 0.22 0.25 0.16 0.19 Twelve-Year-Old Nine-Year-Old Six-Year-Old 0.12 0.16 0.21 0.0053 0.0077 0.011 0.56 0.75 1.0 0.027 0.036 0.048 2.9 3.8 4.8 0.46 0.61 0.81 0.33 0.43 0.55 In Utero, 3rd tri.? In Utero, 2nd tri.? In Utero, Ist tri.® 0.042 0.12 0.00 0.0021 0.0050 0.00 0.21 0.54 0.00 1.0 2.5 0.00 0.15 0.37 0.00 Fourteen-Year-Old One -Year~-Old Newborn 0.10 0.49 0.62 0.0041 0.46 0.026 0.032 2.3 3.0 0.022 0.11 0.14 0.0089 0.022 0.00 2.5 11 15. 0.38 1.9 2.4 0.29 1.3 1.7? 0.11 0.29 0.00 Multiply by 2.7 x 107? to obtain Gy Bq@!. Per unit activity intake of the mother. b. Thyroid Absorbed Dose. We compiled the product of age-specific in- take (see Table 20) and age-specific thyroid absorbed dose per unit intake (see Table 21) for several specific ages (Table 22). The thyroid absorbed dose from all iodine and tellurium nuclides was 7.7 times the dose due to 13ly at Ronge lap Island for an adult male. It was 10 times the dose due to !3!1 at Sifo Island and 4.7 times the dose due to !3!1 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 (1445 rad). James chose this age because three teenage females were the first to develop thyroid nodules, 10 years after the acute exposure. James assumed the total thyroid absorbed dose from ingestion of all iodine isotopes in fallout was 2.6 times the thyroid dose due ¢.. 1317. this factor of 2.6 is dependent upon the age of the fallout and the age of the individual and differs considerably from our estimates. Since James based the total thyroid dose on 1311 measurements in urine and this factor of 2.6, there is a significant difference in thyroid dose derived by our method and that derived by James. Adjusting the James ingestion dose estimate by multiplying by the ratio of 8.6 (our factor for a 3.5-year-old person) to 2.6 increases the total thyroid absorbed dose estimate of James to 47.8 gray (4780 rad). The comparable result for a 3.5-year-old, using our method and Johnson's (Jo81) dose conversion factor, was 37 gray (3700 rad). - 58 -