Table One Thyroid Data Age Group At Exposure No. with & E Surgically gy § Total Proved Number Nodules .£ 2 & Expecte Nodules’ Expecte Cancers Mean Dose Rads Mean Years C At Risk, (Cancers) Nodule D Cancer Risk, Risk, 10-6rad-ly~! 10-6 rad ly- Rongelap In Utero 3 l 0 0.078 0.026 <10 19 14 1 0.49 0.17 10-18 li 2 1 0.84 >18 32 3 2 20 (-) 25 - 4000 13 (15) 14 0.73 0.14 1700 20 (22) 3.1 2.1 2.5 0.22 1300 17 (13) ‘0.71 3.3 65 20 4 3.9 0.56 2190 15 (16) 8.0 1.5 I 0 0 0.026 0.0087 610 - (-) - - <10 7 2 ) 0.18 0.0623 (-) 1] - 10-18 - ~ ~ ~ - - (-) - - >18 11 3 0 0.93 0.077 410 17 (-) 27 - All Ages 12 > 0 1.1 0.15 700 19 (-) 15 - . 4 0 O.21 0.069 130 - (-) - - <19 — 4 l 1.4 0.47 490 25 (21) 3.9 0.95 10-18 19 3 0 1.5 0.24 220 20 (-) >18 24 e l 6.7 9.59 170 23 (22) 3.9 1.3 All Ages 167 15 2 9.8 1.4 280 23 (21) 4.8 9.61 12 1 0 0.31 0.10 290 20 (-.) 9.9 - <10 80 20 2 2.1 0.70 1400 16 (18) 10-18 30 5 2 2.1 0.38 760 20 (22) 5.9 1.2 >18 129 14 3 10 0.80 470 20 (16) 3.3 2.2 All Ages 251 40 6 15 2.1 780 18 (18) 7.1 L.l All Ages 600 Ailingnae In Utero 1100 = 22 Uririk In Utero 18 - All Exposed In Utero 10 r ATiere were two infants with atrophy of thyroid which were not counted, B ‘Co 80. C Assumed to be time between March 1954 and time cf surgezy. Pabsolute Risk = No, of excess cases due to radiatior x 10 mean thyroid dose x No. of subjects at risk x mean years at risk 0.65