CONTENTS (Cont'd) Page c. _The Buildup of BRAVO Fallout on the Ground .......... d. e. A Simple Model for Exposure-Rate History at Rongelap, Sifo, and Utirik Islands 2... ccc ccecccecccccvecsnes Activity and Exposure-Rate History Based on Bikini ASN woveccccvcreccsercccrnncccvcccecceresesescsseses i- Areal Activity and Exposure Rate from Nuclides Observed on Day 26 ..cccccrccccsscccccescsces ii. Areal Activity at Fallout Cessation .........6. iii. Areal Activity of Nuclides Without Descendants in Bikini Ash ceccrcccccccccccvcnsccccceccees iv. Non-Fission-Fragment Nuclides Not Accounted EOL seccccvccscnrccercaccvcssveesersscesscees v. vi. vii. Input Data to Kinetics Equations ....seeeseeee Exposure Rate on Day 0.5 and Surface Roughness BEFECES cece ecccrrecccnccccrcccvccscscevscecse Integrated Exposure and Whole-Body Absorbed Dose 2. 30 30 31 32 37 38 38 39 Radioactivity in Food, Water Supplies, and Air ....cseeee 39 b. Co Activity Ingested with Drinking Water ....ccccceeeees Activity im Food ....ccccccccccsccccvcccccccccscccces 42 44 Activity Concentrations in Air woccscccceccsccsvvsees Activity Intake by Inhalation ...cceevccccccesesceeee 52 52 a. Activity in Cistern Water ....cccscccccscecscccceeeee d. Activity Ingested with Meals .....ccccccccccccccccees g- h. Total Activity Intake ..cccccccccccrecsccessccceveess Deriving !3!r intake Based on Bikini Ash, 895, 39 45 54 and 14034 in Urine on Day 45 Post-Detonation ....-. 54 Absorbed Dose for Individuals .....ccncvccccccsvcevcecens a. Absorbed Dose per Unit Activity Intake ....cccereeees b. Thyroid Absorbed Dose wcsccsccsccccccsccncccesecsesss§ ce. Maximum Thyroid Absorbed Dose ..cscsesssccccccceseees d. External Sources of Thyroid Dose ...ccsecsccccccereess 57 57 57 60 60 i. LIL. 28 eeeoeeveeeresseeeeesreavneasoseeveneeeneeseneeneee e. f. 3. 22 Absorption Through Skin ...ccsccccccccnscccccccecvese 57 Thyroid Nodule Risk and Thyroid Cancer Risk from Exposure to Fallout eevee eeseeeeseeseeeneeeeaneseneeeeeouereeeessteeoseoeneseeesneeees 62 A. B. Tabulation of Thyroid Effects and Age at Exposure ..eseessee+ Tabulation of Risk of Thyroid Cancer ..ececcececseseceseccese 62 62 D. Estimate of the Uncertainty in the Derived Risk Estimate .... 65 C. Comparison to Other Estimates of Risk of Thyroid Cancer ..... - vili - 62