CONTENTS ABSTRACT iii ACKNOWLEDGMENTS. INTRODUCTION Part 1—FALLOUT MONITORING AND DOCUMENTATION 1 DEPOSITION 1.1 1.2 1.3. 1.4 2 36 38 Surface Air High-altitude Samples 48 WATER 3.1 3.2 3.3 4 36 AIR. 2.1 2.2 3 Pot Fallout Collections . Precipitation Collections for Radiostrontium and Radiobarium Sr™ in Soil . Summary of Gummed Film Fallout Measurements Through June 1957 Tap Water River, Precipitation, and Reservoir Water Sea Water UPTAKE OF Sr® AND Cs!3? 4.1 4.2 Milk Other Food and Herbage | 4.3 4.4 Sr® in Urine Bone 4.5 48 48 48 57 Whole-body Measurements of Cs!3? 57 60 61 61 62 Part 2—EXPERIMENTAL INVESTIGATIONS 5 125 UPTAKE STUDIES 5.1 5.2 5.3 HASL Pasture Site Surveys Chicago Milkshed Area Survey Uptake of Sr®° by Bean Plants vil 125 125 125