bP T OID LESIONS IN MARSHALLESE, EXPOS” (AS OF MAY, 1974) Marshall [sland Group (radiation dose-gamma) Age at Exposure Rongelap (175 rads gamma exposure) Rongelap (on Ailingne Island -69 rads gamma In-utero <10 11-16 >16 all '™*EP§° - >16 exposure) all Estimated Thyroid dose-rads Percent2 Thyroid l 175 + ? 506 S deo 3328 (orcas 1 22.2 (4/18) 3 132 Rongelap unexposed <10 >10 all - - Likiep unexposed (1970) <10 - all - i 135i, i352, 135, 135 16.6 - -40,- 80 L 12.5 (1/8) 8.1 (3/37) 32.8 (21/64) 9 (2/12 0.0 (0/53) 22 - + 15 1 3 17 2 0 5.8 (6/104) 3.2 (5/157) 4 4 1.6 (1/61) 0 0.0 (0/31) 0 3.6 (5/137) 0 4.5 (6/133) 3.6 (7/194) - Lesions Surgery 33.3 (1/3) 335 - 675 335 - Malignant Thyroid 89.5 (17/19) <10 >10 all Lesions 675 - 1440 Utirik” (14 rads gamma exposure) TO FALLOUT 4.7 (5/106) 2 2 0 Percent2 5.3 (1/19) 5.4 (2/37) 4.7 (3/64) . - - 1.0 (1/104) 0.6 (1/157) - .° - - - I plus gamma dose. *Based on number of original people exposed. in group. In parentheses number of cases/total number 3ohe thyroid is considered fully developed by age 16. 4ptf ference 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. SFifteen children 10-17 years of age at exposure in this group received estimated thyroid doses between 22 and 40 rads. 7th 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.