eeccca J THYROID LESIONS IN MARSHALLESE EXPOSED TO FALLOUT (AS OF SEPT. 1972)® Marshall Island group (radiation dose-gamma) } Rongelap (175 rads gamma exposure) Rongelap (on Ailingnae Island-69 rade gamma exposure) Utirik? (14 rads gamma exposure) i Rongelap unexposed Likiep unexposed Age at exposure < 10 Estimated thyroid dose-rads! 500-1400 11-20 > 20 all 335-500 335 - < 10 200-500 all - > 10 < 10 > 10 all < 10 > 10 all < 10 > 10 all 1323 40-80 224 - - - - - Thyroid lesions percent? 89.5 (17/19) 12.5 (1/8) 16.5 (3/26) 39.6 (21/53) Thyroid surgery 15 0 2 17 Ma Lignant lesions __percent? 5.3 (1/19 7.7 (2/26 5.7 (3/53) 16.6 (1/6) 0 - 14.3 (2/14) 1 - 12.5 (1/8) l - 0.0 (0/55) 5.8 (4/69) 0 1 0.0 (0/61) 0 - 0 - 3.2 (4/124) 3.8 (5/133) 2.6 (5/194) 0.0 (0/31) 4.7 (5/106) 3.6 (5/137) 1 1 lL 0 0 1.4 (1/69) 0.8 (1/124 - loose from 131, 132, 133, 135, plus gamma dose 2 nased on number living. 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. +Pifteen children 10-17 years of age at exposure in this group received estimated thyroid doses between 22 and 40 rads. Sthe 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 biologleal effectivenena af the thyroid dona per rad would ba lesa in that 4 bo ‘ x Hg t group. fra 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 ag 235