. Radioactivity of the thermal waters of Yellowstone National Park . n with European waters 31 Radium content of deposits of rocks 32 Comparative activities of different rocks 32 Radioactive equilibrium 33 Estimate of age of deposits 33 Comparative test for uranium by analysis 34 Relation to hydrothermal activity 34 3 ILLUSTRATIONS. Page. Plate I. Grotto Geyser, Yellowstone National Park 5 II. Norris Geyser Basin 18 III. A, Old Faithful Geyser, Upper Geyser Basin; B, Hot Spring, Norris Geyser Basin, where thorium was first discovered in the United States 28 IV. Morning Glory Pool, Upper Geyser
. Radioactivity of the thermal waters of Yellowstone National Park . n with European waters 31 Radium content of deposits of rocks 32 Comparative activities of different rocks 32 Radioactive equilibrium 33 Estimate of age of deposits 33 Comparative test for uranium by analysis 34 Relation to hydrothermal activity 34 3 ILLUSTRATIONS. Page. Plate I. Grotto Geyser, Yellowstone National Park 5 II. Norris Geyser Basin 18 III. A, Old Faithful Geyser, Upper Geyser Basin; B, Hot Spring, Norris Geyser Basin, where thorium was first discovered in the United States 28 IV. Morning Glory Pool, Upper Geyser Basin 32 Figure 1. Electroscope 8 2. Apparatus for separating emanation from uraninite 10 3. Apparatus for qualitative tests in the field ! 13 4. Curves showing difference in the radioactivity of gases containing (A) thorium and radium emanation and (B) radium 14 5. Apparatus for collecting gas in the field 15 6. Detail of apparatus for collecting gas in the field 15 7. Decay curve of radium emanation 16 4 U. S. GEOLOGICAL SURVEY BULLETIN 395 PLATE I. GROTTO GEYSER. RADIOACTIVITY OF THE THERMAL WATERS OFYELLOWSTONE NATIONAL PARK. By Herman Schlundt and Richard B. Moore. INTRODUCTION. PURPOSE OF THE REPORT. Dunns; the summer of 1906 we conducted a series of field tests forthe United States Geological Survey with the object of determiningthe radioactive properties of the thermal waters of the YellowstoneNational Park. In connection with the field work, samples of depos-its formed by the springs, some typical rock specimens, and a numberof water residues were obtained. In this bulletin the quantitative dataof the investigation are presented in a series of tables. An accountof the methods of experiment in both field and laboratory precedesthe presentation of results, and a discussion follows. We have indi-cated a possible application of some of the data to a geologic ques-tion—the age of some of the spring deposits; but no systematicattempt has been made to relate t
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