ls T OID LESIONS IN MARSHALLESE, EXPO97” (AS OF MAY, 1974). ~~ TO FALLOUT te / Thyroid l dose-rads Thyroid Lesions Percent Estimated Marshall Island Group (radiation dose-gamma) Age at Exposure Rongelap (175 rads gamma exposure) In-utero <10 175 + ? 675 - 1440 33.3 (1/3) 89.5 (17/19) Rongelap (on Ailingne Island -69 rads gamma !P-YERE >16 88 t feo 132 3978 (2644 16.6 (2/12 11-16 >16 all - exposure) all 335 - 675 335 4 - Utirik’ (14 rads gamma <10 40,- 80 Rongelap unexposed <10 - all - exposure) >10 all >10 Likiep unexposed (1970) <10 all Lose fron LOL, LIZ, 259, Malignant Lesions Percent Thyroid Surgery - 12.5 (1/8) 8.1 (3/37) 32.8 (21/64) 15 1 3 17 §.3 (1/19) 5.4 (2/37) 4.7 (3/64) 22.2 (4/18) 2 3 .- 0.0 (0/53) 0 - 22 - - §.8 (6/104) 3.2 (5/157) 4 4 1.6 (1/61) 0 3.6 (7/194) 2 0.0 (0/31) 0 3.6 (5/137) 0 4.5 (6/133) - - 4.7 (5/106) - 2 0 1.0 (1/104) 0.6 (1/157) - - - - - jay plus gamma dose 2Rased on number of original people exposed. in group. In parentheses number of cases/total number 3the thyroid is considered fully developed by age 16. 4 Difference of opinion as to wnether or not one lesion was malignant. was that it was benign. o « . - . . Majority opinion >the more energetic shorter-lived isotopes of iodine contributed less to the total thyroid dose in the Utirik people due to late r fallout. One might surmise also that the biological effectiveness of the thyroid dose per rad would be less in that group. OF ifteen children 10-17 years of age at exposu re in this group received estimated thyroid doses between 22 and 40 rads. 7 In addition to thyroid lesions, one case of a cute myelogenous leukemia was discovered in September 1972 in a 19-year-old Rongelap b oy who had received 175 rad gamma radiation at one year of age. He died November, 1972.