CONTENTS INTRODUCTION Ime SummaryoF Past FInpDincs w Penetrating Radiation . qi Beta Irradiation of the Skin Internal Irradiation Other Studies Other Background Information Comparison Populations ORGANIZATION The 1965 Survev The 1966 Survey FINDINGS Interval Medical History [lnesses Deaths Births Congenital Anomalies Sex Ratio Miscarriages and Stillbirths Vital Statistics on the Utirik People Physical Examinations.. Adult Examinations... ...... .... Pediatric Examinations Thyroid Findings The Radiation Dose to the Thyroid Glands.. Previous Thyroid Studies. .. Protein-BoundIodine... Dietary Iodine and Urinary Excretion of Iodine. Thyroid Uptake of Radioiodine Serum Cholesterol. .... Discussion of Previous Thyroid Studies. . Developmentof Thyroid Abnormaalities.. Ml