CONTENTS ABSTRACT - -----~------------- eer rr rr rrr 7 FOREWORD ------------~------ oer rt rr rrr rere 8 CHAPTER 1 INTRODUCTION- ~---------~----- errr cet reece 1.1 Objectives----------------- -- eee eer rr rrr re 1.2 Background ~--------~--------~--- +--+ re et rt rr tr eres 1.3 Theory ~-------- - + ere rr rr rr tr rr reer 1.3.1 Initial-Gainma Radiation ---------------+--r ee ete ere 1.3.2 Residual-Gan.ma Radiation --~------------------------1.3.3 Absorption in Air-----~+-~----~--- ee nee ee re er er ee eee 1.3.4 Hydrodynamic Effect -~------------- 2-2-7 - 2 e- e eeree 13 13 13 13 14 14 15 16 CHAPTER 2 PROCEDURE- --------------- 7 - rrr tree rrr cree 2.1 Operations ~--------~-- -------- ---+----- ee eo ee ee eee ee 2.2 Instrumentation -----~--------- e+ ee cer re ere er rer rere 2.2.1 The Residual Instrument System, Conrad I Detector ----------2.2.2 Residual Instrument System Recorder ----------~~-------2.2.3 Initial Instrument System, Gustave I Detector-----------~--2.2.4 Photomultiplier Feedback Circuit, Initial Instrument System - -~---~--------~---------- wate ee ene ---~ 2.2.5 Calibrution-----------------~--------+------~--------2.2.6 High-Range Initial-Gamma Station Culibration -------------2.0 Readout Error and Accuracy of the Gustave and Conrad SvstemS - ~ -------------- oe ee rr ee ere 18 18 18 18 21 22 22 22 25 25 2.4 Beach-Ball-Raciat:on-Detector-Telemeter Unit--------~-------- 26 2.5 VThermal-Radiation Detector---------------------+-- +r ee 27 CHAPTER 3 RESULTS AND DISCUSSION ---~--------------------- 28 3.1 Residual-Radiation Measurements- ----------------~-------- 28 3.2 Initial-Radiation sleasurements --~------ wee ee er tr rere 43 3.3 Beach-Ball Measurements - - - ---~-------~----~--------~---- 49 3.4 Thermal-Radiation Detector-- ~----------+-+---------- rere 49 CHAPTER 4 CONCLUSIONS- ~---------------~--------- +--+ ee 4.1 Residual-Gamma-Exposure Rate-~-~-------+--------+-------4.2 Initial-Gamma-~Exposure Rate ---~-~-----+--~------- ere ere 4.3 Beach-Ball Overation ~~-------+-----------------------4.4 Thermal-Radiation Detector- ------------~----- reer ere ere 4.5 Recommendations- -------------------+-------e---- --- 52 52 52 52 52 52 REFERENCES - ------------------ ---2--- re er re reer eee 53