Table 6 Risk Coefficients? for Marshall Islanders, 5~Year Latent Period Excess Group Years Thyroid Total at Risk Cancers Person-Rad Risk Coefficient Age 1954 Number <10 10-18 >18 85 32 120 2.2 2.7 1.9 120,000 21,000 56,000 17.2 22.7 11.2 L.ix107® 5.8x107° 3.0x1076 237 6.8 200,000 14.9 2.3x107° Tocal 4Thyroid cancers per person-rad~-years at risk, based on thyroid dose from internal plus external sources. Table 7 Estimated Risk Coefficient? for Internal and External Exposure 10-Year Latent Period 5-Year Latent Period External Internal External Internal Risk Risk Risk Risk Coefficient Coeffictent Coefficient Coefficient 85 32 120 3.31076 3.3x107° 1.0x1078 1.4x10786>) 8 .0x1075 6.1x1076 2.5x1076 2.5x1076 1.3x1076 1.0x107° 6.3x107° 3.3x107° 237 2.1x1078 4.7x107° 1.9x107° 2.9x107° Group age 1954 <10 10-18 >18 Total Number “Thyroid cancers per person-rad-years at risk. ba value of 1.3x1076 results when 4.9x107° is used for the external risk coefficient. 26