. Radioactivity of the thermal waters of Yellowstone National Park . WASHINGTON GOVERN M E NT PRINTING OFFICE 1909 CONTENTS. Page Introduction 5 Purpose of the report 5 Waters in Yellowstone Park -. 5 Scope of the investigation 0 General plan of work 6 Acknowledgments 7 Apparatus 7 Description of electroscopes 7 Standardizing the electroscopes 9 Electric capacity 12 Methods of procedure 13 Field examination of gases 13 Field tests of waters 16 Testing of solids 17 Results of the experiments 18 General statement 18 Example showing method 18 Radioactivity of gases 20 Radioactivity of waters 22 R
. Radioactivity of the thermal waters of Yellowstone National Park . WASHINGTON GOVERN M E NT PRINTING OFFICE 1909 CONTENTS. Page Introduction 5 Purpose of the report 5 Waters in Yellowstone Park -. 5 Scope of the investigation 0 General plan of work 6 Acknowledgments 7 Apparatus 7 Description of electroscopes 7 Standardizing the electroscopes 9 Electric capacity 12 Methods of procedure 13 Field examination of gases 13 Field tests of waters 16 Testing of solids 17 Results of the experiments 18 General statement 18 Example showing method 18 Radioactivity of gases 20 Radioactivity of waters 22 Radioactivity of water residues, spring deposits, and rock samples 25 Summary of radioactivities 27 Discussion of results 28 Gas activities 28 Thorium emanation 28 Relative activity 28 Gases from European springs 29 Helium not determined 29 Activity of waters 30 Inferences from different results 30 Comparison with European waters 31 Radium content of deposits of rocks 32 Comparative activities of different rocks 32 Radioactive equilibrium 33 Estimate of age of depo
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