THYROID LESIONS IN MARSHALLESE EXPOSED (AS OF SEPT. 1972)® TO FALLOUT Marshall Island group Age at Estimated thyroid Thyroid lesions Thyroid Malignant lesions (vadiation dose-pamma) exposure dose -rads percent surpery percent Rongelap (175 rads gamma exposure) Rongelap (on Ailingnae Island-69 rads gamma exposure) Utirik? (14 rads gamma < 10 11-20 > 20 all 500-1400 335-500 335 - < 10 200-500 1323 - 12.5 (1/8) 14.3 (2/14) < 10 40-80 0.0 (0/55) 0 ~ 5.8 (4/69) 3.2 (4/124) s 10 all 22 89,5 12.516.5 39.6 (17/19) (1/8) (3/26) (21/53) 16.6 (1/6) 15 0 2 17 0 1 L. - - - exposure) + 10 all Rongelap unexposed < 10 > 10 all - 0.0 (0/61) 3.8 (5/133) 2.6 (5/194) 0 1 l - Likiep unexposed < 10 > 10 - 0.0 (0/3i) 4.7 (5/106) 0 0 - all lnose from 2 131, 132, 133, 135 I Based on number living. - 3.6 (5/137) L l 5.3 (1/19) 7.7 (2/26) 5.7 (3/53) _ 0 1.4 (1/69) 0.8 (1/124) - plus gamma dose , In parentheses number of cases/total number in group. Fone child 10-17 years of age at exposure received estimated thyroid doses between 132 and 200 rads. +Pifteen children 10-17 years of age at exposure in this group received estimated thyroid doses between 22 and 40 rads. >the more energetic shorter-lived isotopes of todine contributed less to the total thyroid dose in the Utirik people due to later fallout. One might surmise therefore that the blologleal effectLvenesa of the thyredd dona per vad would he leva tn thae group. Orn addition to thyroid lesions, one case of acute myelogenous leukemia was discovered in a 19-year-old Rongelap boy who had received 175 rad gamma radiation at 1 year of age. 235 0505