aa THYROID LESIONS IN MARSHALLESE EXPOSED TQ FALLOUT (AS OF SEPT. 1972)8 Marshall Island group (radiation dose-gamma) Rongelap (175 rads eeee ey Ey ey pee gamma exposure) Rongelap (on Ailingnae Island-69 rads gamma exposure) Utirik? (14 rads gamma Age at exposure < 10 200-500 -6 (1/6) 0 - all - 23 (2/14) l - < 10 1323 1 -0 (0/55) 0 - 2 (4/124) 1 < 10 > 10 all - -0 (0/61) 8 (5/133) 6 (5/194) 0 1 1 < 10 > 10 all - .0 (0/31) -7 (5/106) 6 (5/137) 0 0 0 Rongelap unexposed Likiep unexposed all 131, 132, 133, 135 40-80 .5 (1/8) 15 0 2 17 Malignant lesions percent“ 5 5 5 -6 > 10 (17/19) (1/8) (3/26) (21/53) Thyroid surgery 500-1400 335-500 335 - > 10 2 pased on number living. Thyroid lesions percent < 10 11-20 > 20 all exposure) lnose from Estimated thyroid dose-rads 224 8 (4/69) l 5.3 (1/19 7.7 (2/26 5.7 (3/53 - - 1.4 (1/69 0.8 (1/12 - I plus gamma dose In parentheses number of cases/total number in group. Jone child 10-17 years of age at exposure received estimated thyroid doses between 132 and 200 rads. 4p ifteen children 10-17 years of age at exposure in this group received estimated thyroid doses between 22 and 40 rads. 5 The more energetic shorter-lived isotopes of iodine contributed less to the total thyroid dose in the Utirik people due to later fallout. One might surmise therefore that the biolagleal effectivenesa of the thyraid dena per rad would be lesa in chat group, 6 In 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 a, 235