TABLE OF CONTENTS TEXT Page Il. Iii. INTRODUCTION... .. cc ccc ce ee ee ee ee ee ee eee ee eee 1 INSTRUMENTATION, DATA COLLECTION AND ANALYSIS....... 4 A. Instrumentation... ... ec eee tenes Spectrometer System... .... cece ce ee ee ee cee Tonization Chamber. ........ cee ee ee eee es Portable Scintillation Detector.............c0008 G. M. Survey Meters... ccc cece ccc cc eres eens csane Thermoluminescent DoSimetersS..... ce. eee cece eee nes 5 5 5 6 7 8 B. Soil Sampling... .. cc. ewe e cee we ee ee eee ew twee eee 10 C. Error Estimates and Data Evaluation.............. Error in Total Gamma-Ray Exposure Rates.......... Error in Partial Exposure Rates for Major EMIttersS... ccc eee eee ee tee eee eee ee eee eee eee Error in TLD ResultsS......... ccc cece eee een cence Overall Consistency of Data............0. 02 ee eee 13 13 13 14 14 EXTERNAL ENVIRONMENTAL RADIATION ON BIKINI ATOLL....15 A. Bikini Island... .. cee cece cee eter eee e eee ees Total and Individual Isotope Exposure Rates Along the O Transect...... eee cee te wee wee eee Total and Individual Isotope Exposure Rates Along the Village Road Transect..........250006. Total Exposure Rates Along the 1 Transect........ Total Exposure Rates Along the South and North End TranSectS... 2... cence eee ete eee eee eee ws eae Total and Individual Isotope Exposure Rates at the Clearing Experiment Site......... ee eee eee 16 17 22 23 24 24 Summary of Exposure Rates on Bikini Island.......28 B. Eneu C. Bokantuak, Iomelen, Rojkere, -~ iv- Eonjebi............. 31 DOP ARG HIVES