CONTENTS ABSTRACT- - ---~----------------------- 22-7 - 5+ ----------- 1 PREFACE -----~---- rrr nr rrr rrr rss 8 FOREWORD ------~-- srr rr rr rrr rrr rrr ree 9 CHAPTER 1 INTRODUCTION ~----------- -- 7-37 r enn re rr rrr ern 15 1.1 Objectives ~------------ oe rrr rrr rrr rae 15 1.2 Background ~----------- 3-2-0 tr rrr reece CHAPTER 2 15 DESIGN OF THE FIELD EXPERIMENT ----~-------------- 17 2.1 Radiation Measurements --~-~------~-------- Re ree ee ee ee nee 2.1.1 Instrumentation -------------~ --- tre ne er een re nee 17 17 2.1.2 Calibration of Instruments ~------~--~---------- eo ree rn 2.1.8 Measurements Made --~------~ errr rr ere rt re rere 2.2 Water Sampling ----------- eo re rr rer rene 2.2.1 Sampling Devices-~--------~--~-------- ne ee tr cnr 18 20 21 21 2.2.2 Samples Collected ---------------- nnn nr eer rn rn 22 2.3 Supplementary Oceanographic Measurements ~------------------2.4 Plankton Sampling ----------- wrt cer er em er serene CHAPTER 3 23 25 RESULTS OF SURFACE AND SUBSURFACE SURVEY BY RADIATION DETECTING INSTRUMENTS --- 2-9 ene ee me re re er eee 26 3.1 Problems Involved in Computing a Synoptic Fallout Picture ------~---3.2 Raw Measurements of Surface Gamma Intensity-------------------+ 26 26 8.3 Reduction of Readings to Roentgens Per Hourin Situ--~---------~---3.3.1 Correction for Instrument Contamination -------------------3.3.2 Running Plot of Relative Gamma Intensity In Situ--------------- 3.3.3 Computation of Absolute Magnitude of In Situ Intensity --------~-+- 3.4 Computation of Synoptic Picture - ----~------ 2-6 rr me mre eee 3.4.1 Vertical Extent of Activity--~-----~----------------- oe 3.4.2 Conclusions Regarding Penetration Progress ----------------- 3.4.3 Computations of Total Local Fallout ----------------------3.4.4 Estimate of Radioactive Decay ---~---------- reno nnn nen 3.4.5 Local Dose at 3 Feet Elevation at the Synoptic Time H + 12 Hours----------~------------a meen eee 3.4.6 Local Dose at 3 Feet Elevation at the Synoptic Time H +1 Hour -----------~--------- 24-2 3.4.7 Effect of Time of Arrival and of Ocean Currents on Synoptic Presentation —--- ---~--~------3--- er rere 3.4.8 Plotting Fallout Contours of Iso-Dose-Rate -~----------~-----3.4.9 Plotting Fallout Contours of Total Dose -~------------------i1 27 27 27 32 32 32 35 35 35 46 46 46 46 52