CONTENTS Page ADSETACE cece ccc r ccc w cee r ea reene esr sere csseresecsrenseetesscees Acknowledgments. ..cececcrcnnscccccccccersen seen aanccweseeneesvene IMNCTOMUCE LOM sce se reer cac ccc necar seven seer scecesscereesseeesseces Methods and Results... cc cccccscccccccccccc cece v veces recess snacsen I. II. 1-131 Thyroid Burden at Rongelap Island Based on Urine BiOASSAY. reece cece nc veccereccccereenccevecesreeescenccssene Radioiodine Air Concentrations Based on Meteorological Data and Source Term Data..crcccscsescccnccccnscssserecseses III. Radioiodine Surface Activity Based on Archival Soil Analysis for T-l29. ccc ccc ccc cece ence reer cee c er sccsccecces IV. Thyroid Absorbed Dose Estimate Based on Bikini Ash Results and Results from I, IT, and IIL... cece ccc cncccecee A. Surface Radioactivity And Exposure Rate Estimates...... B. Radioactivity In Food, Water Supplies and Air....sseeee C. Absorbed Dose for Individuals.....cececsceccnccsccccvce DISCUSSION... cece cece renee nese e meer e nee nensen cesses resets ssenese CONCLUSLON cc cece r cece verve ne rarer erences sereseressvecetsereces