TABLE OF CONTENTS FACT SHEET PREFACE ILLUSTRATIONS 21 TABLES Chapter 1 OVERVIEW 25 Introduction Purpose 25 Historical Background 26 Report Organization 26 Nuclear Tests and Radiation Exposures 27 Experimental Program 31 Weapon Development - 29 31 Yield Measurements 32 Diagnostic Measurements 33 Effects Experiments 35 Environmental Measurements 35 Systems Response Experiments 36 Oceanic Testing Operations 37 Marshall Islands Setting 37 Physical Conditions in 1954 42 Radiological Conditions in 1954 47 Special Problems in Oceanic Testing 51