TABLE ] Thyroid Lesions in Marshallese, April 1976 Group Rongelap exposed (175 rads) Ailingnae exposed (69 rads) Age at exposure Est. thyroid dose, rads to Subjects” with] thyroid lesions] 810-1150 335-810 89.5 (17/19) 25.0 (3/12) 15 l 5.3 (1/19) All 556° 35.9 (23/64) 19 &.7 (3/64) < 10 275-450 < 10 10-18° > 18 10-18 > 18 All In utero exposed Utirik exposed (14 rads) 335 190 135 217 9.1 (3/33)4 33.3 (2/6) 0.0 (0/1) ~ 36.3 (4/11) 33.3 (6/18) 175+? 69+? < 10 10-18 > 18 All Rongelap unexposed < 10 10-18 > 18 All Likiep unexposed < 10 33.3 (1/3) 0.0 (0/1) 60-95. 27-60 1.7 (1/58) 9.5 (2/2%) | 27 - if 1 0 1.7 (1/58) 4.8 (1 21). 6.4 (10/157) 4 1.3 (2/157) 0.0-(0/72) 15.4 (2/15) 7.4 (9/122) 5.3 (11/209) 0 1 2 3 0.0 (0/31) 0 3.6 (5/137) 0 3 4.7 (5/106) < 10 > 10 3.4 (3/88) 5.7 (4/70) 0 0 1.6 (3/191) 0 < 10 > 10 All 6.1 (2/33) 0 3 4 > 10 All All unexposed 3 % Subjects? witt malignant lesior L 1 9.0 (7/78) 50¢ All Wotje unexposed No. subjects} with surgery| 4.4 (7/158) 6.4 (20/313) 4.6 (23/504) 0 0 0 0 4 Dose from 131, 132, 133, and 1335 plus gamma; mean dose extrapolated from calculations~° for adults and 3-year olds (see Section II). rh 0 ma A Based on number of people ex posed, excluding those in utero (number of cases/total number in group). The thyroid is considered to be fully developed by about age 18. One additional case of adenoma, found at autopsy, not included here, Weighted mean dose. Pathologists differed as to whether this lesion was malignant; it was scored as benign.