Abstract . . «6 List of Figures . I. II. .©« . 2. © «© © «© © © »8© 8 «© © «© © © 8 «© «© +2 «© 6 e e e . ° e e oe e . € e * e e ? ... . . INTRODUCTION «© 8 «© 8 © PHYSICAL ASPECTS OF THE FALL-OUI PROBLEM... «8 «© 6 A. B. C. Radioactive Materials Formed in a Nuclear Detonation . Radioactive Particle Formation. . . . . .« « e« e The Radioactive Cloud. .. . o 8 o 8 E. Mechanisms e ° e . oe F. G. H. Fractionation. . . «6 .« « «© « « Areas Involved and Material Available Evaluation of Fall-out Models . . . «© o . «© «© . «© © . «8 © 6 « «© 6 « « I. World-wide e e e e o BIOLOGICAL ASPECTS OF THE FALL-OUI PROBLEM... . . D. III. . A. Effect of Meteorological Conditions on the Cloud. . of Fall-out. Distribution e e e e e e e e e 8 e e ° B. .. . e * e e ° e e . e e « ° o e o ee . Internal. . . . «© «© © «© «© Tl 82 8h 89 . Evaluation of the Human Hazard Due to Radioactive Fallout: +2«© «© «© e ° . « -« Critical Assessment of Biological Significance . . Maximum Permissible Concentrations of Radioisotopes The Radio-strontium Problem . . . . .. . e . Pathway Through the Biosphere o © © © « . Hazard Calculations . . . ..« « « « e Evaluation of the SUNSHINE Model Calculations Evaluation of the Strontium-90 MFC e Effect of Higher Concentrations . The Iodine-131 Problem. . Operation CASTLE Experience IV. CONC LUSIONS e s e e e Cy e ° . ° . e oe . e ° ° e e e 62 63 70 e eo The Genetic Problem ° . Application of Physical Contour Lines to Lethality e 3h 50 35 62 Evaluation of the Human Hazard Due to Radioactive Fallout: External oe © 2 . . . Lethality Expectation for Total-Body Irradiation . Expectations . . . .. Radiation Injury Expectation Operation CASTLE Experience. The Beta Hazard . .. =. BSRBREU wp FE TABLE OF CONTENIS . . 95 95 oT 100 102 109 116 120 121 122 125 128