CHAPTER 4 ANALYSIS OF CONTAMINATED SEA WATER-~- ---~----~--- 53 4.1 Sample Analysis- --<-- --~-- 7-7 otter rrr rtm 55 e eee ee- 58 to Gamma Counts -- ~~ - - or rt nr er ee ne ee ee ee 63 Per Unit Area -- 7 roe rrr rr rr re ree eee 63 4.6 Calculation of Dose Rate, d ~----- 7 tr rr rn re ne ee 4.7 Calculation of Dose Rate d From Observed Gamma 68 4.2 Calculation of A~Gamma Activity Received Per Unit Area of the Ocean Surface ---- ~~~ - -- - e o 4.3 Calculation of I/A--Ratio of GammaIonization Readings 4.4 Calculation of R/I-Ratio of Gamma Energy Emission Rate Per Unit Area to GammaIonization Reading 4.5 Calculation of Reference Dose Rate, dp -------~----------------- 67 Field—Sample Activity Ratio --------------------------4.8 Fraction of Shot 5 and Shot 6 Devices in Fallout --~-----~----------- 70 71 REFERENCES ~ - 33 wrt ttt rt en re rece eteee 16 SUMMARY, DISCUSSION AND CONCLUSIONS -~---------~-~--- 17 5.1 Summary -- 9-0 + rere nce re re re en ee ee eee 5.2 Discussion and Conclusions --~--- -~----~---~----~----=+----~--- 17 27 CHAPTER 5 APPENDIX A COMPARISON OF COMPUTED DOSE RATE OVER THE SEA WITH CERTAIN ACTUAL MEASUREMENTS -----~---- 79 APPENDIX B PROCEDURE USED IN CHAPTER 3 FOR ESTABLISHING THE CALIBRATION OF THE TOWED INSTRUMENTS FOR MEASURING GAMMA RAYS UNDERWATER --~------~--7" B.1 Calibration of Instruments in Air -~---------~-------~--------= B.2 Estimation of the Response to Underwater Radiation ~-~-------~~---B.2.1 Estimates of the Source Spectra~~-~---~~----------------B.2.2 Calculations of the Underwater Dose Spectra Corresponding to the Assumed Fallout Source Spectra---~--------------:~--B.2.3 Instrument Response Variation Due to Photon Energy Variation Alone -----~----~-- esr rr rrr re errr B.2.4 Instrument Response Variation Due to Angle of Incidence Alone ~ -- rrr rn rrr rr rr rrr rr rrr rere B.2.5 Estimates of 4 Pi Monochromatic Sensitivity ---------~----~---B.2.6 Response of Mark II to Distributed Sources Comprised of Mixed Fallout Materials ----~--- 7-7 r rere rrr rere cern B.2.7 Derivation of Complete Response Curves for the Instrument 81 81 83 83 83 83 83 83 87 Mark II WhenIt is Used Submerged in Fallout Contaminants ---~-- 87 COMPUTATION OF DOSE AT THREE FEET ELEVATION ~rerr rrr rr rrr rss 88 C.1 Computation of Dose at Three Feet Elevation From Measurements of Dose in Water ~~~ -- rr rrr ttt tte terre 88 C.3 Conclusion Regarding Hypothetical Dosage at 3 Feet Elevation~-----~-~ 91 APPENDIX C C.2 Numerical Computations ~-- ---~ -7-™~-Tosa tata 12 91 ,