CONTENTS Page wo ABSTRACT © INTRODUCTION. 1.1 Previous Fall-out Studies . 1.1.1 At Operation Greenhouse 1.2 Objectives . 1.1.2 CHAPTER 2 2.1 2.2 2.3 . OPERATIONS 11 14 14 14 15 17 Land Stations Lagoon Stations Sea Stations . 2.3.1 Shipboard Stations . 2.3.2 2.3.3 CHAPTER 3 3.1 At Operation Jangle ow oo CHAPTER 1 Free-floating Stations Operational Success INSTRUMENTS. 18 Design Criteria . 3.1.1 Collecting Requirements . 3.1.2 Mechanical and Electrical Restrictions . 3.1.3 . Pressure and Thermal Effects Expected from the Bomb Burst . 3.1.4 Environmental Requirements . Total Fall-out Collector . Differential Fall-out Collector . Incremental Liquid Fall-out Collectors Rain Gage . . . . Ion-exchange Columns Gum-paper Collector. 3.2 3.3 3.4 3.5 3.6 3.7 3.8 Air Sampler 3.9 Design of Stations : 3.10 Evaluation of Instruments . 3.10.1 Rain Gage 3.10.2 Incremental Collector . 3.10.3 Differential Fall-out Collector 3.10.4 Trigger Mechanism . 3.10.5 Total Collector 3.10.6 Ion-exchange Collector . 3.10.7 Gum-paper Collectors . . 3.10.8 Résuméof the Operation of the Instruments . 5 ee 18 18 18 18 19 19 19 19 19 25 25 25 25 31 31 31 31 31 32 32 32 32