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PARTICIPANTS W. M. Alexander National Aeronautics and Space Administration Goddard Space Flight Center 8719 Colesville Road Silver Spring, Maryland Edward Anders Enrico Fermi Institute University of Chicago Chicago 37, Illinois James R. Arnold University of California La Jolla, California Wallace S. Broecker Lament Geological Observatory Palisades, New York A. G. W. Cameron California Institute of Technology Pasadena, California Samuel Epstein California Institute of Technology Pasadena, California E. L. Fireman Smithsonian Astrophysical Observatory Cambridge, Massachusetts Robert A. Fish Enrico Fermi Institute University of Chicago Chicago 37, Illinois Paul W. Cast Department of Geology University of Minnesota Minneapolis 14, Minnesota Gordon Goles Enrico Fermi Institute University of Chicago Chicago 37, Illinois Albert R. Hibbs Jet Propulsion Laboratory California Institute of Technology Pasadena, California Patrick M. Hurley Department of Geology Massachusetts Institute of Technology Cambridge, Massachusetts Mark G. Inghram Department of Physics University of Chicago Chicago 37, Illinois Truman P. Kohman Department of Chemistry Carnegie Institute of Technology Pittsburgh 13, Pennsylvania A. O. C. Nier Department of Physics University of Minnesota Minneapolis, Minnesota Stanislaw Olbert Massachusetts Institute of Technology Cambridge, Massachusetts George W. Reed, Jr. Argonne National Laboratory Argonne, Illinois
John H. Reynolds Department of Physics University of California Berkeley 4, California Oliver Schaeffer Chemistry Department Brookhaven National Laboratories Upton, Long Island, New York Peter Signer Department of Physics University of Minnesota Minneapolis, Minnesota Heinz Stauffer University of California La Jolla, California Hans Suess University of California La Jolla, California Anthony Turkevich Enrico Fermi Institute University of Chicago Chicago 37, Illinois J. A. Van Allen University of Iowa Iowa City, Iowa George W. Wetherill Department of Terrestrial Magnetism Carnegie Institution of Washington 5241 Broad Branch Road Washington, D. C. vi
CONTENTS FOREWORD iii THE ORIGIN OF THE SOLAR SYSTEM 1 A. G. W. Cameron, Mount Wilson and Palomar Observatories COMMENTS ON THE TIME DEPENDENCE OF NUCLEO- SYNTHESIS 7 Truman P. Kohman, Carnegie Institute of Technology XENON IN STONE METEORITES 9 John H. Reynolds, University of California at Berkeley PRIMORDIAL ARGON AND NEON IN STONE METEORITES . . 15 Heinz Stauffer, University of California at La Jolla COSMIC RAY AGES OF IRON METEORITES 22 Oliver A. Schaeffer, Brookhaven National Laboratory ARGON-37, ARGON-39 AND TRITIUM IN RECENT METEORITE FALLS 28 E. L. Fireman, Smithsonian Astrophysical Observatory THE DISTRIBUTION OF RARE GASES IN IRON METEORITES . 31 Peter Signer and Alfred O. Nier, University of Minnesota COSMIC RAY PRODUCTION OF RADIOACTIVE NUCLIDES IN IRON METEORITES 45 J. R. Arnold, University of California at La Jolla COSMOGENIC NUCLIDES IN THE HAMLET METEORITE ... 51 Anthony Turkevich, Enrico Fermi Institute for Nuclear Studies, University of Chicago THE HIGH ENERGY COSMIC RAY SPECTRUM 53 S. Olbert, Massachusetts Institute of Technology LOWER ENERGY COSMIC RAYS AND THE SOLAR CYCLE . . 58 P. Meyer, Enrico Fermi Institute for Nuclear Studies, University of Chicago vu
ON THE GEOPHYSICAL AND GEONUCLEAR SIGNIFICANCE OF THE EARTH'S RADIATION BELTS 63 James A. Van Allen, State University of Iowa MICROMETEORITE STUDIES FROM EARTH SATELLITES . . 69 W. M. Alexander, National Aeronautics and Space Administration EXPLORATION OF THE MOON AND PLANETS 73 A. R. Hibbs, Jet Propulsion Laboratory, California Institute of Technology DIAMONDS IN METEORITES 77 Edward Anders, Enrico Fermi Institute for Nuclear Studies, University of Chicago HEAVY-ELEMENT ACTIVATION ANALYSES OF METEORITES 82 George W. Reed, Jr., Argonne National Laboratory STRONTIUM AND RUBIDIUM IN STONE METEORITES .... 85 Paul W. Cast, University of Minnesota SECULAR CHANGES IN THE CONCENTRATION OF ATMOS- PHERIC RADIOCARBON 90 Hans E. Suess, University of California at La Jolla RADIUM-URANIUM AGE DETERMINATIONS ON MARINE SHELLS 96 Wallace S. Broecker, Lamont Geological Observatory, Columbia University OXYGEN ISOTOPE MEASUREMENTS IN GLACIAL ICE . ... 102 S. Epstein, California Institute of Technology Vlll