Table 3 Age Group 10 to 18 Data Summary Number of PersonSerccsscccccee cence scene cece esse eee esses eraseeerereseesecee IS Internal Exposure, Person~Radsecveesesverencccesssseccessscccsssccenss 18,000 External Exposure, PersonRad..cesccscccscasssesessscccccscsccssscceneee 2900 Number of Observed CarcinomaS..cccesccccncectces en sscccnsasssesssssssneseees SF Average Years Post-Exposure to Onset of Carcinoma. ccssceseccssscsesssces 28 Assumed Latent Period, YearS..ceccccssaccecnesscnvesseseccvesensveses J and 10 Number of Expected Spontaneous Carcinomas. .csecccnseenaesesesesseseensee 0.30 Table 4 Age Group >18 Data Summary Number of PersonsSessscccsscccasceccnccrscncccsenn tte ssaseastsvscvesssscses Lag Internal Exposure, Person—Rads sssccccccscsccassccsnccccecscssevesesess 48,000 External Exposure, PersonRad.ssscccceccecccerencesoncesseesesesesereses 8,000 Number of Observed Carcinomas...cscscacceserccecs seme c ecw ete nese c ec esas ncese FG Average Years Post-Exposure to Onset of Carcinomacc.sescsccesrescceresece Assumed Latent Period, Y@aTSeccccensvaasccnssevcenesssevesccececnzese Number of Expected Spontaneous Carcinomas. ..ssceccsessesserensaccenes sae veneer 16 J and 10 1.1 Table 5 Risk Coefficients? for Marshall Islanders, 10-Year Latent Period Excess Group Age 1954 <10 10-18 >18 Total Number Years Thyroid Total at Risk Cancers Person-Rad Risk Coefficient a5 2.2 120,000 12.2 1.5x107° 32 2.7 21,000 17.7 7.4x10°° 237 6.8 200,000 11.3 3.0x107° 120 1.9 56,000 6.2 5.4%107° @"Thyroid cancers per person-rad-years at risk, based on thyroid dose from internal plus external sources. 20