20 Tabie 12 Iodoprotein Levels (IP) in Populations Under Study (ug%) 1966 - 1969 Nonexposed and low-dose groups (no thyroxine treatment) Ailingnae Subject No. 6 8 70 39 Curik Age (1969) & sex IP 16 i6 30 40 5.8 2.8 1.9 2.5 M F F F Subject Age & No. Sex 2101 2146 2119 2166 Av. 3.2 Rongelap nonexposed 62 51 33 54 2125 M F F M 32 M Subject IP Age & No. sex 7.9 7.0 8.1 79 813 816 822 833 15 19 22 36 M F M M 1.9 6.4 1] 1.5 Av. 7.9 843 855 40 F 64 M 3.2 7.3 8.5 835 35 M 858 74 F 914 931 932 938 956 34 15 34 30 60 1532 Rongelap people not on thyroxine With thyroid lesions ( before surgery ) Subject No. 3 3 2 23 IP Subject No. 16M 16M 17M 19M 1.3 1.3 2.0 1.8 32 27 74 68 72 15 21 F 22 F 9.2 10.2 18 64 - 36 F 45 F 1.0 4.5 36 22 M 1.0 34 I F M F F F 19 F 2.3 14.5 9.2 0.7 6.7 1.9 6.4 3.5 Av. £.8 Thyroidectomy No thyroid lesions Age & sex IP Subrotal Total Age & sex iP Subject No. Age & sex IP Subject No. Age & Sex IP 18 M 27M SIM 59 M 1.7 3.3 1.7 3.7 17 23 33 34 17M 19M 16 F 16M 3.5 1.7 1.3 0.9 17 21 64 3* i8F 18 F 45 F 16M 2.9 17 4.1 1.3 18 F 4.2 60 F 65 M 3.4 3.6 Av. 2.9 Av. 3.6 65 19 16 F 18M 20 61 22M 23 F 42 3.3 0.9 5* 16 M 1.3 Av. 2.6 1.3 6.7 Av. 2.6 *Placed in this category because of nearly complete atrophy ofthe thyroid gland. dose from the various iodine isotopes to the child’s gland was about 1000 rads, with a range of 700 to 1400 rads. The glands received an extra 175 rads from external gamma radiation. Previous Thyroid Studies Even before the developmentof thyroid nodules was noted, the evaluation of thyroid status of exposed individuals received considerable attention, since it was recognized thatthe slight growthretardation noted in someof the children might be related to radiation effects on that gland. However, on the basis of physical examinations and serum PBI and cholesterol determinations each individual examined at that time was believed to be euthyroid. It soon became apparent that the average serum protein boundiodine in the Marshallese of both Rongelap and Utirik was higher than