induced activities. The curves are shown in Figures 4.1] and 4.5. From these curves the dose rate at H + 12 hr dj, for Shot 5 is: dy) = 5.58 x 27.4 x 10-" A roentgens hr7! = 1.53 x 10-5 A roentgens hr-! RELATIVE AcTivITY and for Shot6: dy. = 5.63 x 15.7 x 107? A roentgens hr=! = 8.85 x 10-8 A roentgens hr7! e005 enom t ' 3 THE AFTER DETONATION (HR) Figure 4.5 Calculated decay (d/m) for Shot 5 fallout. Results for Shots 5 and 6 are tabulated in Tables 4.6 and 4.7 respectively.’ In view of the close agreement between these results for Shot 5 and those calculated independently from the water survey data (Chapter 3), contours for the water sampling results have not been drawn. Instead a comparison of the two sets of data is shown in Table 5.1. Shot 6 results were plotted and contours drawn as shown in Figure 4.6. Aerial survey data (Reference 8) taken at H + 13 to H + 17 hours (Able flight) and H + 25 to H + 32 hours (Baker flight) were used as a rough aid in constructing contours, especially in areas where no water samples were taken. Relative intensities were read from aerial survey traces. Locations where aerial survey data and water sampling data coincide were used to normalize approximately the aerial survey traces to dose rate values calculated from water sample data. Drift corrections were applied to the latter. Baker flight traces were arbitrarily shifted 6 miles north and 6 miles east to improve the fit with Able flight and water sample data. The shift may be justifiable on the basis of errors in drift correction and position determinations. tions were made for the aerial survey data. No depth of mixing calcula- Contours across the lagoon area were taken from Proiect 2.5a data (Reference 4). 7 In this report no attempt has been made to apply a “terrain factor” to the calculated results to approximate more closely the dose rates which would have been observed over a real land area. A terrain factor has not been estimated for PPG site conditions. Ksanda (Reference 7) has estimated for Operation Jangle fallout area at NTS that observed dose rates = 0.6 x calculated dose rates. 69