CONTENTS FOREWORD ----------------------- 2-2 ene eee ee eee eee ee eee 4 ABSTRACT - ------------------- ee eee ee ee ee er eee ee eee ee ee eee 5 PREFACE------------ 2 eee ee ee ee ee ee ee ee ee ee eee ee ee ee eee 6 CHAPTER 1 INTRODUCTION-- -----------------------------woceceeee 11 1.1 Objectives- -----------------+-------+------- ++ ee ee ee ee eee 11 1.2 Background -----------+-----+-------+-------- ee eee ee eee ee tl 1.3 Theory------------+------------ +--+ --- ee ee ee ee ee eee 12 1.3.1 Fallout Contamination of a Water Volume--------------~--------- 12 1.3.2 Fallout Contamination of a Land Surface ------------------------ 13 1.3.3 Radioactive Decay --~------------+----------- ee eee eee eee 14 1.3.4 Distribution of Fallout -----------------------------------+- 15 CHAPTER 2 PROCEDURE------------------------ ee eee eee eee eee eee 16 2.1 Shot Participation- --------------------------------------+---2.2 Operations ----------------------------------------------2.2.1 Aerial Surveys -----~--------------+---- eee eee ee ee ee eee 2.2.2 Altitude Absorption -----------------------+--------+-------2.3 Instrumentation ----------------+-------+------- ee eee ee eee 2.3.1 Aerial Survey --~---------------------------- ee ee ee ee 2.3.2 Altitude Absorption -------------------------------------+2.4 Required Data ---------+------------------------------- eee 16 uw 16 19 19 19 20 20 2.4.1 Distribution of Contamination in the Sea ------------------------ 23 2.4.2 Altitude Absorption --------------------------+--+------+---- 23 2.4.3 Stability of Contaminated Area------------------------------- 23 CHAPTER 3 RESULTS ---------------------+------------- +e ee - eee 24 3.1 Instrumentation Performance ------------------------+----------$.1.1 Aerial Surveys ----~-------------------------- ee e ee 3.1.2 Altitude Absorption ---------+--------------+------ +--+ eee 3.2 Altitude Absorption Measurements -----~----~---+---+--+-------+---3.3 Distribution of Fallout- ----------------------------------+---3.3.1 Shot Cherokee-----------------------+---+-- +--+ --- - e e eee 24 94 24 25 28 29 8.3.2 Shot Zuni ------------------ eee ee ee ee ee ee ee ee ee ee eee 28 3.3.3 Shot Flathead ------------------------------------------ 31 3.3.4 Shot Mohawk -------------------------------+---+----+- eee 35 3.3.5 Shot Navajo ------~-------+---------+------------- eee 35 3.3.6 Shot Tewa---------+----- ere rere ere re re re tere 45 3.4 Samples of Contaminated Sea Water-----------+--------+-------+---- 45 3.4.1 Gamma Radiation as a Function of Beta Activity ---------------+---- 45 3.4.2 Depth of Mixing - === +0200 2020 reso ern ec e essen oe Sage aBCHIVES CHAPTER 4 DISCUSSION ------------------------------------eee 55 1 v\ 4.1 Operational Performance ----------------------------+---+------ 55