(AS OF MAY, 1974) / / | Estimated Age at Marshall Island Group Exposure (radiation dose-gamma) In-utero <10 Rongelap (175 rads gamma exposure) 11-16 >16 all In NES§O Rongelap (on Ailingne Island -69 rads gamma exposure) >16 all Utirik” (14 rads gamma exposure) Rongelap unexposed - 7.48 aan mr aan an Thyroid Lesions Percent dose-rads 175 + ? 675 - 1440 335 - 675 335 - 9+? 300 - 480 Thyroid Surgery - Lesions Percent 33.3 (1/3) 89.5 (17/19) 15 . 5.3 (1/19) 32.8 (21/64) 17 4.7 (3/64) 12.5 (1/8) 8.1 (3/37) 0.0 (0/1 33.3 (276 132 - Malignant 1 3 5.4 (2/37) 16.6 (2/1 22.2 (4/18) 1 2 3 - - 40,- 80 0.0 (0/53) 0 - all - 3.2 (5/157) 4 0.6 (1/157) <10 - 0 - 22 5.8 (6/104) 1.6 (1/61) >10 all - 4.5 (6/133) 3.6 (7/194) <10 > - 0.0 (0/31) 4.7 (5/106) all Dose from Thyroid , <10 >10 Likiep unexposed (1970) i TO FALLOUT eo LESIONS IN MARSHALLESE, EXPOSgm ; . / - 3.6 (5/137) 4 2 2 . 0 0 0 1.0 (1/104) - - - . rIhs 496, 297s *9"T plus gamma dose Based on number of original people exposed. in group. e In parentheses number of cases/total number 3mhe thyroid is considered fully developed by age 16. 4oifference of opinion as to whether or not one lesion was malignant. was that it was benign. Majority opinion >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 also that the biological effectiveness of the thyroid dose per rad would be less in that group. Fifteen children 10-17 years of age at exposure in this group received estimated thyroid doses between 22 and 40 rads. "tn addition to thyroid lesions, one case of acute myelogenous leukemia was discovered in September 1972 in a 19-year-old Rongelap boy who had received 175 rad gamma radiation at one year of age. He died November, 1972.