. te APPENDIX F DETERMINATION OF MATERIAL BALANCE FOR SHOT 1 FALLOUT PATTERN (r/hr at 1 hr) ‘In determining the meterial talence for a eiven fallout pattern, it is necessary to relate the amount of activity acecunted for cithin the fallout contours to that produced in the detongtion. The gamma field surveys of the outer islands were made from & to 10 days after Shot 1. The following material balance was calculated for - time t = 0 +S ceys. Selection of this time eliminated the introduction of any possible errors due to extr:.noletion of the field measurements ‘*oearly times. Furthermore, experimental data on the gamma energy spectrum were availetle for this time period. F.il PER CENT OF DEVICEACTIVITY AT TILE (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 N= d/s/1M¢fissions at time (t) mF heta particle to gamma photon ratio then y, s F = 90004 1000 KT A = 165% 1023 Ko o= 4.93 x 1072 r = 0.45 FAN, x 1074 Te, et time (t) photons/sec