or 1 rf/hr at 0 + 9 days is produced by an infinitely sontaminated plane of uniformly denosited activity of 1.03 x 10° photons per sec per sq cm. — ; “ . } i 7 F.3 CALCULATION OF MATERIAL BALANCE The fallout pattern was evaluated out to the 100 r/hr at l hr contcur by measuring the areas between contours in sq cm and assuming the arithmetical average of the peripheral contours as the average level of activity for the area segment batween the contours, for Shot 1 are given in Table F.1. i " 4 ) , “ | There is some indication that the average value of activity between contours is not arithmetical, However, existing field data do not indicate any one cor.tinuous function that describes it precisely. Material balance data TABLE F,1 = Material Balance, Shot 1 f-——= ee ae ee ee Contours concidered in determination of areas (Fig. 6.6) (r/hr at 1 hr) Avercre levels between contours at O+ 9 days (r/nr) Area (sq ) q om Total rate (photo s/sec) P a 300C to center of pattern 3.42 5.3 x 1013 1.87 x 10 2000 to 3700 2.25 7.5x10'3 2.2 x 10° 1909 to 2000 1.71 1.0x 104 1.76 x 102° 0.96 0.342 1.56 x 10! 3.35 x 10 1,33 x 10°° 3,18 x 1029 509 to 1000 }200 to 500 20 2 Therefore, within the 100 r/hr at 1 hr contour 2.39 x 10*° photons per sec are accounted for at 0+ 9 days. &.39 x 1020 - 0.57 1.47 x 10° Thus, 57 per cent of the device activity is accounted for. F.e4 FRACTIUN OF THE DEVICE COLLECTED IN TOTAL CCLLECTOR, STATICN 251,03 A radiochemical analysist® on the fallout collected at Station 251.03, where the gamma field reading was 1 r/hr at 0+ 9 deys, yielded a value of the bomb fraction over a 1 sa ft area to be 1.35 x 107 3, U6 This