TABLE OF CONTENTS TEXT Page TI. Tr. INTRODUCTION... ccc ec re ec coe ee ee twee eee tere tees tence 1 INSTRUMENTATION, DATA COLLECTION AND ANALYSIS....... 4 Instrumentation... ...c ccc ccc eee ee eee eee eee eee Spectrometer System. ... ccc cee ewer ener eres rveees Tonization Chamber. .... ccc ce cece ee ee ee ee eee eee 5 5 5 A. Portable Scintillation Detector. .....cceccceeecce 6 G. Survey Meters........ cece eee e cere eee eer ece 7 Thermoluminescent DosSimetersS.....cccecseecccvscvce 8 M. B. Soil Sampling, ..... ccc cece eee e crore ese seers eenes 10 Cc. Error Estimates and Data Evaluation............-¢. 13 Error in Total Gamma-Ray Exposure Rates.......... 13 Error in Partial Exposure Rates for Major Emitters... . ccc cere cc te tec ree wee eee ee tee ete es 13 Error in TLD Results. .... ccc eee cece revere vceveeees 14 Overall Consistency of Data... ec cece cece eee eee 14 III. EXTERNAL ENVIRONMENTAL RADIATION ON BIKINI ATOLL....15 A. Bikini Island... ... cc cc ce ee we ee ee eee eee eres 16 Total and Individual Tsotope Exposure Rates Along the 0 TransSect....... ce ccc eer ce rr ecvrveres Total and Individual Isotope Exposure Rates Along the Village Road Transect..........+0.8.Total Exposure Rates Along the 1 Transect........ Total Exposure Rates Along the South and North End TranSectsS.... cc cece ccc ree eee ee rete weer eens Total and Individual Isotope Exposure Rates at 17 22 23 24 the Clearing Experiment Site......... cc eee eee 24 Summary of Exposure Rates on Bikini Island....... 28 B. Eneu C. Bokantuak, Iomelen, Rojkere, EBonjebi............. 31