CONTENTS Torre V.—Internal Emitters... ...0..0..00.0..0-. 20-0000 Internat Dose From Snort-Livep Raptonuciipss............Karl Z. Morgan Urraxe or lopins—131 1n Human anp Bovine Tuynroips Fotiowing Detonation or NuceBar Warons.....0 0... cee eee Margaret R. White and Hardin B. Jones Tue Excrenmon or Raproactive Fission Fragments py Man Page 147 149 161 INTRODUCTION On December 12, -13, and 14, 1956, a Symposium on the Shorter-Term Biological Hazards of a Fallout Field was held at the Pentagon, Washington, D. C., under the joint sponsor- Dunne ContinentaL AND Overseas Weapons Trsts........ Ariel G. Schrodt, James B. Hartgering and Kent T. Woodward Merasouic Srupiss Wits Srrontivm—-90 in THE Ransvs Monkey. Patricia W. Durbin, Marshall W. Parrott, Marilyn H. Williams, Muriel G. Johnston, C. Willet Asling, and Joseph C. Hamilton Puvuronrum Contamination Founp Orrsrre Foutowine OnsPont DBTONATIONS. 0.0.6... 0 000 ec eee eee M. W. Carter and O. R. Placak 165 185 and to suggest new research approaches to the many unresolved problems. “ TORY TRACT. ce tee tenet eee J. N. Stannard and P. E. Morrow 189 headings: 1. Decay Constants, Weathering and Shielding Rerenvion or Sus-Mricron Amrosots in THE Human Rusrrra- Tur Snort Term Biovoaica, Fare ano Prrstsrance or Ranroactive Fautout as Meastreo at Various Locations Wrrnin Paunovr PArTerns. 000.0 eee tenet e eee R. G. Lindberg and K. H. Larson 173 were to review the basic information related to the more immediate effects of fallout, both 197 Resrpvat Contamination or Pianrs, ANIMALS, Soi, AND WATER H. V. Weiss S. H. Cohn Pusiic Hearra Impuications or Saort Term Hazarps........J. G. Terrill, Jr. Discussion on Topic V.......... Peete teen eee ete eens Gosine REMARKS. ...0.0 00000 e cee eee eee Eugene P. Cronkite biological and physical, laboratory and field, The papers were presented under five topic Chairman, Dr. Louis B. Werner, U. S. Naval Radiological Defense Laboratory 2. Gamma Energy Spectra and Geometry Factor Chairman, Dr. Eugene P. Cronkite, Brookhaven National Laboratory or tar Manssat. Istanps Two Yuars Fotuowirne Orrration CASTLE FAULOUT. 00.0000 ce ee eee enter ene Parsistrence or Rapioactive Contamination IN ANIMALS OF Mansuaty Isuanps Two Years Arran OPERATION CastLe.... ship of the Atomie Energy Commission and the Department of Defense. The purposes 211 219 223 233 3. External Beta Radiation Chairman, Lt. Col. James T. Brennen ’ Walter Reed Army Medical Center 4. Biological Repair Factor Chairman, Dr. Nathaniel I. Berlin, Na- tional Institutes of Health 5. Internal Emitters Chairman, Dr. Wright H. Langham, Los Alamos Scientific Laboratory Whatever success the Symposium may have achieved was due to theefforts of the chairmen, speakers and diseussants. Appreciation is expressed especially to Colonel Roy D. Maxwell and Commander Thomas E. Shea, Jr., Armed Forces Special Weapons Project, and to Mr. George T. Anton of the Atomic Energy Commission, for their able assistance in planning and conducting the Symposium, and to Mrs. Violet M. MeC'arthy of the Atomic Energy Commission for her invaluable secretarial assistance.