CONTENTS Page eeseoueusaeeeeeeseeeneeeneee02020288ee898# ec seesesepeoescesceseueeeceeeeo ee seen seor Acknowledgments eeeneneovoveecueueevuevoevee List of Tables List of Illustrations Summary I. Il. eevee eseeepeoe eevee eet ccc ccccccccccccccccccccesceeveccscecseseseeceece and xi xLit Results cece ccc ceccccecccccccecccucecsecceccecscucces ‘'3lr Intake at Rongelap Island Based on Urine Bioassay eeeveeoueo eve seeoeenspewveesesvvpeveeevaeewveeseeseweaeznoeoseaesznesepseeseeaneeosaeaene Radioiodine Air Concentrations Based on Meteorology .....eeelL. 2. 3. 4. 5. Calculation of BRAVO Fallout Patterns .ccccsccscccscccese Comparison of Whole-Sfody Dose Estimates... ccccccccssecs Duration of Pallout wccccccccccccccccccnescsnesevesevccce Rate of Rise-of-Exposure Rate wcrcccsccccscescccscccseces Comparison of Airborne Activity Concentrations ..cccecees Radioiodine Surface Activity Based on Archival Soil Analysis for 1. Ze 3. 4. t eepeaeeevonaeveenvnevoseevosaeeveeeeoeveeneeaneeseeosveovenwesvenpeevueeaeseeaseanes 10 The Archival Soil Sample Collection ......c.ccceccscceces 10 10 12 Archival Soils ..cccccccccccsancccceccccccsnesscccscceres 12 Analysis of Samples ..ccccccccnccccccccccccvcvesesscceese Estimace of Initial Surface Activity ..cccccccccccccceccs Ratio of Nuclide Activity to Total Fallout Activity in The Ratio of Nuclide Activity to Fission Product Activity for Thermonuclear Fission wcccsccnccsccccccccscsscevess The Ratio of Nuclide Activity to Total Activity for Bikini ABW ceccccrcccsscccvcccccvccssscsscvcscscccecess D. ix eoeeepeeve4uaoevosvnevenvneeae eevee sveeaew eee eaeeeeoeaosv ecaevpeseeenweauevpeeaeaeaeeneene Results C. speneseeveveeesneaeeoteoue ®eeseseeeceeeeosneeessebteevneervrevnee ee eanee evn eev sae anoseeeveeveeveoseseeznenseasneaeneeee Methods R. eee ease esesesceneneasreenseeeeoeansreeeeeeeneeeeeoaseeeeeeseveseoese Introduction a. een Lii wwoa~w Preface 14 15 Comparison of Archival Soil Measurements to Thermonuclear Fission Data and Bikini Ash Estimates ......scccceecees Estimation of Radioiodine Activity per Unit Area Based on Soil Activity for 1297 JLo. cece ccc cee nee eeenes 18 Thyroid Absorbed Dose Estimate Based on Bikini Ash Results .. 19 Surface Activity and Exposure-Rate Estimates ..ccccsccens 19 19 21 Le Ae Nuc lide b. The Composition Decay of Fallout e@aaesnssvevseveneeevneevneeses espe neseoeaneeed eee c cence rec cc cece ese neeeeseses - vii - 17