a cnt at eae areIN TABLE OF CONTENTS TEXT Page It. INTRODUCTION. 2... cw ec cee wr re wr ee reer ere eee eee renee 1 INSTRUMENTATION, A. DATA COLLECTION AND ANALYSIS....... 4 Instrumentation... ce eee eee ee eee ee eee ene tenes 5 Tonization Chamber... ... ccc ee ee ee ees Portable Scintillation Detector..........2 cc eee G. M. Survey MetersS.... cc. .cc e et ne Thermoluminescent DoSimeterS....... eee ee ee eee 5 6 7 8 Spectrometer System... cece cece eee ee ee eee 5 B. Soil Sampling. . 1... ccc ccc cc eens 10 C. Error Estimates and Data Evaluation.......... 2+e.13 Error in Total Gamma-Ray Exposure Rates.......... 13 Error in Partial Exposure Rates for Major Q EMItters... ec ccc cee eee ee eee eee ee teens 13 Error in TLD Results... . ccc ccc ce eee ee ee eee ens 14 Overall Consistency of Data............ ee eee eee 14 IIIf. EXTERNAL ENVIRONMENTAL RADIATION ON BIKINI ATOLL....15 A. Bikini Island... cc cece ce eee ee ee ete eee 16 Total and Individual Isotope Exposure Rates Along the 0 TransSect..... cc cee ee ee eee ee ee 17 Total and Individual Isotope Exposure Rates Along the Village Road Transect..........0.0ee05 Total Exposure Rates Along the 1 Transect........ Total Exposure Rates Along the South and North End TYanSects. .. ec ccc eee eee ee eee te tees Total and Individual Isotope Exposure Rates at the Clearing Experiment Site... ..... ccc ce eee eee 22 23 24 24 Summary of Exposure Rates on Bikini Island....... 28 of Enersy Depar tment Historian’s Oifice B. Eneu C. Bokantuak, ARCHIVES Iomelen, Rojkere, Eonjebi............. 31 e) -~ive-