1 OID LESIONS IN MARSHALLESE EXPOs("TO FALLOUT (AS OF MAY, Marshall Island Group (vadiation dose-gamma}- Age at Exposure Rongelap (175 rads gamma exposure) In-utero <10 L1-16 >16 Estimated Thyroid 1 dose-rads Thyroid Lesions Percent Thyroid Surgery 175 + ? 675 - 1440 33.3 (1/3) 89.5 (17/19) 15 335 - 675 12.5 (1/83 335 all - Rongelap (on Ailingne In YEFG° Island -69 rads gamma [16 exposure) all Utirik? (14 rads gamma exposure) 2 1352, 1535, 9 390 : 480 132 - - <10 - all - - 4 0.6 (1/157) 1.6 (1/61) 0 3.6 (7/194) 2 4.7 (5/106) 3.6 (5/137) - 0 4 0.0 (0/31) - 2 5.8 (6/104) 4.5 (6/133) - 4.7 (3/64) 3 3.2 (5/157) - 17 22.2 (4/18) - . §.3 (1/19) 5.4 (2/37) 1 at all 22 1 Malignant Lesions Percent 3 33:3 ee 16.6 - >10 i153 32.8 (21/64) 0.0 (0/53) all 1nose from L351, - 40,- 80 <10 Likiep unexposed (1970) 8.1 (3/37) <10 >10 Rongelap unexposed 1974) 2 0 0 0 - - - - I plus gamma dose. Based on number of original people exposed. in group. In parentheses number of cases/total number Imhe thyroid is considered fully developed by age 16. “Di €ference of opinion as to whether or not one lesion was malignant. was that it was benign. . 1.0 (1/104) Majority opinion the more energetic shorter-lived isotopes of iodine contributed less to the total thyroid dose in the Utirik peopie due to later fallout. One might surmise also that the biological effectiveness of the thyroid dose per rad would be less in that group. Srifteen 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.