APPENDIX F DETERMINATION OF MATERIAL BALANCE FOR SHOT 1 FALLOUT PATTERN (r/hr at 1 hr) In determining the m*terial talence for a civen fallout pattern, it is necessary to relate the amount of activity aencunted for stithin the fallout contours to that produced in the detonztion. The pamma field surveys of the outer islands were made from & to 10 days after Shot 1. time t e 04S cevs, The follovinr material balance was calculated for Selection of this time eliminated the introduction of eny possible errors due to extr:.-olstion of the field measurements to early times. Furthermore, experimental data on the gaonma energy spectrum were avuiletle for this time period. F.1 PER CENT OF DEVICE ACTIVITY AT TIME (t) Let Y, = total No. of photens/sec at time (t) F = fission yield of the device in KT A = No. of fissions/KT of yield Ny = a/s/1fissions at time (t) mF beta particle to gamma rhoton ratio et time (t) then 7%, = F = 90004 1000 KT A = 1.5 ~% 1023 * hoo: 4.93 2.9 x r OO, 45 = FAN x 1074 ————t——— Tt 107? 143 nhotens/see