PAGE NO. ABSTRACT, , ) ee Se ee eee oe ee i INTRODUCTION . 2. 1 we we et ew et tw 1 SAMPLING PROGRAM. 2... 1. ee ee ee ee ee ee } ANAYLTICAL METHODS... 2... eee eee et ew 8 Gamma-ray Spectrometry, . 2... 2... 1 wee ee ee 8 Strontium-90 and Plutonium Analyses ........e64.. 9 Error Limits. .......008,wt wee ee 9 Limits of Detection. .. 2... 2... ww te eee 9 RESULTS. 2 2. 2 ee ee ee eeSk eee 10 Ailuk and Wotje Atolls. ........808 868088 10 Utirik Atoll]. . 2... 2... ee ee tee 13 Rongelap Atoll. » . 1... ee eee ee et ee 13 Bikini Atoll. . 2... 2. we ee ee te 14 DISCUSSIGN AND CONCLUSIONS . . . 2... ee ew we ew ee 14 Comparison Between Atolls ..... 2... we ew ee 14 Differences Due to Sample Type. ........e6-. 5 SUMMARY. 2 0. ee ee ee Se 5 REFERENCES . 2 1 1 1 6 we ee ee we et tt ew 16 APPENDIX TABLES. 2. 2... 2 ww ee ee ee eh ee ee 17 DISTRIBUTION LISTS . 2... 4... we ew ew ae eae. 36 FIGURES FIGURE 1. FIVE ATOLLS IN THE NORTHERN MARSHALL ISLANDS WHERE SAMPLES WERE COLLECTED SEPTEMBER-OCTOBER 1976 . . 2 2. SAMPLING SITES ON BIKINI ISLAND, BIKINI ATOLL, OCTOBER 1976 . 2 2. 1 ee ee ee es 3 3. SAMPLING SITES ON WORMEJ AND WOTJE ISLANDS, WOTZE ATOLL AND ON AILUK AND BIGEN ISLANDS, AILUK ATOLL, SEPTEMBER 1976. . 2... 2 2 es ee ee 4 Vi —~- TABLE OF CONTENTS