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TABLE OF CONTENTS
TEXT
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I.
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II.
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CALIBRATION OF NEW 4"
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x 4" NaI(T1)
DETECTORS.........
Photopeak Area Method... ... cece cee ee eee eee ewes
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Energy Band Method........ cece cece eee eee eee ete e eae 5
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INTRODUCTION, 2... ccc we ee eer ee eee ee teem ete te tte tees
III.
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Total Spectrum "Energy" Method... .... ccc eee ee ee eee
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MAJOR FIELD
INVESTIGATIONS-1965......... 200 cc eee ecene
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Resurvey of 1962 and 1963 SiteS...... cc eee eee ees
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Preface... ccc ee ee we eee ee ee eee eee ees
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Studies of Cosmic Ray Ionization... 1... cc eee eee wenn 10
Spectrometric Determination of 137¢s Concentrations
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in SOULS... cc ee ee ee ee ee tee eee eens 12
Measurements over Solid Rock... .... cece eee ee ee eee 14
Measurements of Low Level Radiation............0-e-0008. 15
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Study of B-ray Ionization Intensity...............00- 16
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Special Studie€S..... ccc eee ee eee ee ee ee eee 16
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Correlation with Neonatal Death Rate “and Birth
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Weight... . ccc cee ee eee et ee ees 16
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Comparison with Continuous Monitoring Experiment...17
Measurement in High Uranium Area......... eee eee eee 17
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Correlation with Aerial Survey Data.............64. 17
Intercalibration of Detectors... .. cc ewe eee ees 17
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IV.
CONTINUING ENVIRONMENTAL RADIATION STUDIES........... 18
Beta Radiation... . ccc ee we te ee eee eet eee 18
Variation of Natural Dose Rates with Time............ 20
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High Pressure Ionization Chambers..........0.eeeeeeee 23
Theoretical
Investigation of Gamma Ray Transport..... 26
ACKNOWLEDGEMENTS... ... cc ee eee eee ee ee ee ees vee ee ewe 28
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REFERENCES. .....000 00000 cece cece eee eeeeeteneeeeeenenees 29
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APPENDIX
APPENDIX 1.
CALCULATION OF
IONIZATION CHAMBER RESPONSE... .33
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