As discussed in Section 3.1.2, the distribution of gamma energies was estimated from the visual observations of a meter on the gamma Spectrometer. Observations at 500 and 800 feet above Site Sally on Mohawk D + 2 showed a general response where the predominant portion of the energy spectrum fell between 350 and 600 kev. 3.3 DISTRIBUTION OF FALLOUT The isodose charts contained in this section have been referred to H + 24 hours and gamma dose rate at 3 feet above the surface. The decay correction is based ont~'** The flight altitude was 300 feet for all surveys, so the altitude correction is based on a factor of 2.5. r X BIKINI! RONGELAP | AILINGINAE Noutca! Miles A 1 '65* 1 ‘ L 166° 1 167° Figure 3.5 Flight pattern, Shot Cherokee D-day. The EOB is based on a minimum detectable limit by the detector of 0.01 mr/hr. This converts to 0.025 mr/hr at the surface. Where there are no flight legs in a position to close an isodose plot, dotted lines indicate the estimated position. The estimates are based on previous days’ results wherever possible. Contamination enclosed within an isodose bounded area is calculated on the basis of the average gamma intensity between consecutive isodose lines, anda contamination density of 0.4 megacurie/naut mi* for 1 mr/hr of gamma dose rate (Section 1.3.1). DOE ARCHIV 3.3.1 Shot Cherokee. The D-day flight encountered no radiation intensities above the detectable limit. The flight pattern is included to show the area searched (Figure 3.5). The D+1 flight was used for instrument check, because no contamination was found on the previous day. 3.3.2 Shot Zuni. The D-day flight examined the region in the vicinity of the atoll (Figure 3.6). Because there was not enough datato develop isodose plots, radiation profiles have been plotted along the flight legs. 28 a rs ~