ha | CONTENTS Page ABSTRACT ii ACKNOWLEDGEMENTS iii SECTION INTRODUCTION 1 “Dut Historical The Computation Model Defects of System 10 EXPERIMENTAL DATA Comparison of Duplicate Stations Evaluation of Strontium 90 Data Evaluation of Infinity Gamma Dose Data il 14 23 SUMMARY 30 PROCEDURE FOR GUMMED FIIM 32 32 32 Sampling Sample Preparation Counting Data Handling 33 34, 36 BIBLIOGRAPHY SECTION IL MONTHLY SUMMARIES FOR INDIVIDUAL STATIONS - iv ~- 37