CONTENTS (Continued) Biological Factors in the Radiation Problem Relating to Society 277 Entry of Radioactive Fallout into the Biosphere and Man 282 Discussion of Meteorological Factors and Fallout Distribution . 310 Meteorological Interpretation of Sr® Fallout 327 A Study of Fallout in Rainfall Collections from March Through July 1956 339 A New Method for Collection of Fallout Material from Nuclear Detonations 355 LIST OF ILLUSTRATIONS™ 1 2 3 4 5 6 Sr®® in New York City Fallout (High-walled Stainless-steel Pot Collections) Srin Pittsburgh Fallout (Galvanized Tub Collections) Location of Lamont Geological Observatory Soil Sampling Sites, 1955 Histogram of Sr® Per Square Foot for New York Soils Cumulative sr® Deposition in United States as of June 1957, Gummed Film Measurements Cumulative World-wide Sr® Deposition as of June 1957, Gummed Film Measurements Ta Variation of Sr® and Cs'*" Activity with Altitude Tb Variation of Sr® Activity with Latitude 8 9 10 11 12 13 14 15 Sr®*° in New York City Tap Water Monthly Sr® Levels in New York City Liquid Milk Monthly Sr®® Levels in Perry, N. ¥., Powdered Milk Monthly Sr®® Levels in Mandan, N. Dak., Powdered Milk . : Monthly Sr® Levels in Columbus, Wisc.+ Powdered Milk . . . Histogram of sr” Concentration in Bones Pot Fallout Collections in the Hartford Area New York State Department of Health Milk Powdering Plant Survey eth 10 12 37 37 48 58 58 59 59 62 137 151 LIST OF TABLES” 1 2 Pot Fallout Collections, New York City Monthly Pot Fallout Collections at Other 13 3 United States Locations Monthly Pot Fallout Collections. at Locations Outside the United States 17 4 Rainfall Sample Analyses, Pittsburgh, Pa. 19 23 28 5 Rainfall Sample Analyses, Chicago, Ill. *For Parts 1 and 2.