shot, Flathead, 1 -hof the fallout remains airborne. Thus, .allout and mixing in the sea could be expected to persist well into D+], 3.3.6 Shot Tewa. A D-1 survey (Figure 3.20) defined the background status to the west of the atoll, prior to the shot. The D-day flight (Figure 3.21) located the upwind boundary, The TABLE 3.5 SUMMARY OF FALLOUT DISTRIBUTION, NAVAJO Isodose Area mr hr mi? Difference Area Average Contamination mr hr mec mit ht patt WL iby Water > Figure 3.19 Flig ace. et above surf H+ 24 hours an d 3 fe Numbers show e legs Lluwi wy ee D+1 1.25 158 0.25 0.125 958 1,788 0.025 10,490* 158 1.35 85 800 830 0.75 0.18 240 60 8,702 6.06 209 594 mc at H+ 24 hours Dt2 1.25 0.25 90 1,267 0.125 3,263 0.025 20,930* 90 1,177 1.35 0.75 49 353 1,996 0.18 144 17,667 0.06 424 970 me at H+ 24 hours * Based on estimate of isodose position. ao” D +1 survey (Figure 3.22) discovered a contaminated area extending over 200 miles west of : Bikini. The outside boundary could not be closed on this survey, because of the far-out sector contained active fallout from Shot Huron. position of the EOB. The D+2 survey (Figure 3.23) extended the estimated The isodose was still not completely closed. The aircraft was not allowed to lose radio contact, so the survey covered only the area out to 275 miles from Bixini. The 0.25 mr/hr isodose extended into the far northwest sector on D+1. By D+2, the position had shrunk to approximately a third of the enclosed area. The predicted pattern shows that this far-out material could not be expected to arrive before H+19 hours. Thus, it is probable that the readings in the area on D+1 were due to material that was not completely mixed. By D+2, some 30 hours had elapsed, and mixing was probably complete. The D+3 and D+4 surveys, Figures 3.24 and 3,25, delineated the hot area, permitting an examination of the shape and position of these inner areas from D+1 through D+4. Summarizes the fallout areas throughout the shot participation. Tabie 3.6 3.4 SAMPLES OF CONTAMINATED SEA WATER Duplicate samples of sea water were furnished to this project by the U.S. Naval Radiological Defense Laboratory (NRDL) and by Scripps Institution of Oceanography (SIO) from their seaSampling programs. After the close of Operation Redwing, these samples were analyzed for beta activity in the particulate and salt fractions at the HASL. 3.4.1 Gamma Radiation as a Function of Beta Activity. DOE ARCHIVE The analysis of each sample, the gamma intensity estimated at each sampling location, and the comparison of these results are contained in Appendix D. A straight averaging of the beta activity and the estimated gamma in- tensity yields a figure of 4 x 108(dis/min)/liter per mr/hr. The wide variability of the comparison for each sample obviates definite conclusions. However, much of the data falis within +50 percent of the theoretical calculation of 4.43 x 10°(dis/min)/liter of beta activity per mr/hr of Bamma activity 3 feet above the surface. Thus, these results may be considered indicative of validity of the assumption. 45 umm te