TABLE OF CONTENTS TEXT INTRODUCTION, *es @ #8 @# ees & ee see¢eseetpeeu5nese#eetepesesee#es#eenrpeeee SURVEY TECHNIQUES ...ccccnccecresevccnee Choice of Site... ccwcnnnvcvecccccscnces Instrumentation and Field Measurements, DOSE RATE DETERMINATIONS .....ccceecceen Total Terrestrial........ ec eee ec cee cece. Natural Gamma Fallout Gamma eeepee48sse s o os o¢4«808 uo 8 @ @ s s o s a e e e ee s . s # ¢ @ uveeet#teersernetrnte*eeaertrteentetesterhmieuase#e VALIDITY OF DOSE RATE VALUES......ese00 RESULTS AND DISCUSSION. ...cccnceceeceecnas Southeastern United States.,.....c.ccecsees Central and Western United States........ Sundance, Wyoming and Vicinity....... Olympic Peninsula, Washington,........ San Francisco Bay Area... ..cecescccece Denver and Colorado Springs, Colo.... SUMMARY... ccc REFERENCES vce AND ner cee crn NOTES... ents ew tte w neues cecesvenecsene TABLES TABLE I. DOSE RATE CALIBRATION OF SPECTROMETER. TABLE II. MEASUREMENTS ON THE OLYMPIC PENINSULA, WASHINGTON, OCTOBER 1-2, 1962.......... LEGEND TABLE FOR Ill. TABLE SURVEY »L5 x Ss DATA... 2 ccccecvcunncnesecseccvers iii ~.17