radioactivity will be 2 on or near the target. If many 2 KT bombs are used in a given campaign for area bombardment, rain scavenging mist be taken into consideration from the military and civilian defense point of view within the general battle area. VIz. ACCURACY OF THE 7ALL-OUT PLOTS SHOWN IN FIGURES 1 THROUGH 9 Figures 1 through 4 indicate the fall-out from the last four shots of TUMBLER/SNAPPER (R). It is believed that Mgures 1 and 3 indicate the fall-ert quite accurately, but Figures 2 and 4 are not as ~ 7 NES dg accurate. (R). Figure 2 shows the fall-out from Shot No. 6 of TUMBLER/SNAPPER During this shot the aircraft became contaminated, hence most of the air readings were unusable, No. 8 of TUMBLER/SNAPPER (R). Figure 4 shows the fall-out from Shot Since the radioactive contamination fell in areas where there are no usable roads, there is practically no information from the ground radiological monitoring teams. This means that the fall-out plot is based practically completely on air readings extrapolated te the greund. It should be noted that the percentage fall- out .rom this shot is well below the average for this series indicating that if only air readings are used the percentage fall-out is underesti- mated (see Table I for details). Figures * through 9 represent the fall-out from the large tower shots of UPSHOT/KNOTHOLE (R). represents the fall-out from U/K Annie Shot, Mure 5 It is believed that although the distant fall-out (50 miles to 120 miles from ground zero) ig quite accurate, the fall-out within the gunnery range itself is open to question because it is dependent upon air readings only and no ground died ote oe checks have been made, It is presumed that the fall-out isodose lines UNCLASSIFIED any D0 1290, _ oS quai: \epee moe oe