24 element composed of 1 kg each of 2354) 238) | and Pu. The fission product yield distribution was not that of a nuclear device, so the values in this decay matrix were corrected by the factor R(A). RA) = where R(A) FYO(A) FY(A) = b tay relative fractionated fission yield fission yield used by the ORIGEN computer program. Curies of fractionated fission products The ORIGEN computer program followed the decay of each of the 152 fission products from zero time to 50 years postshot. There were 30 decay intervals, 10 from zero time to 21 hours, 10 from zero time to 300 days, and 10 from zero time to 50 years. The elements of this matrix were then multiplied by 10° to give the correct values for each fission product for 1 kt of fission yield. This new matrix was incorporated into the computer program for this work. (See D(A), below. ) The curies of each fractionated fission product as a function of time was given by CICA), = D(A), * R(A) + KT, where CI(A), = curies of mass chain A (fractionated) present