CONTENTS ADSETACE cece ccc cee rc ccc nec c cena secre cee s eee ceser sens seeecesenes Acknowledgments. .ccccccccccccccccsccsccscccsscesesancsssessessses IMNCrOduclion..cscscccccccccccccrsseneessseccccsesessenesssesesseen Methods and Results... .ccccnccccccvevevcccvccnccssescnssensescesce I. I-131 Thyroid Burden at Rongelap Island Based on Urine BIOASSAY ce ecccsccncc ccc ccc ccc e secs ee cee eeeeeenesseesecssees II. Radioiodine Air Concentrations Based on Meteorological Data III. and Term Data rcoccccsccveacaesesscveseseseccereces Radioiodine Surface Activity Based on Archival Soil Analysis IV. Source for TH129 . Crew c ccc ccc ccc mec e scene ee ccneesccctceces Thyroid Absorbed Dose Estimate Based on Bikini Ash Results and Results from I, IT, and LIL. .ccccccsscccccceces A. Surface Radioactivity And Exposure Rate Estimates...... B. Radioactivity In Food, Water Supplies and Air.....ceees C. Absorbed Dose for Individuals. ...cccsscscccccscccsccese Discussion. ..cccccsccccccvacrccscnccecssesssescsssseesscecececece CONCLUSION. ccccccccveccccaccccccen ences ctescececccecscessceeccece