0018933 2.6 DATA REDUCTION The analytical results were computed in the normal manner for the elemental analyses done for the project. However, the first, and more time-consuming phases of the data reduction were carried out on the IBM 650 computer at UCRL, Livermore, The radiochemical data were manually transcribed to IBM cards in the proper form for use by the computer, which was coded to apply a least-squares fit to the decay data and to make corrections for chemical yield, radioactive decay and the aliquot of the sample used, The output of the computer gave the counting rates for the individual radionuclides at zero time of the shots, Further computation was performed by hand to obtain the number of fissions, product-to-fission ratios or R-values, Determination of the R-values, defined in Section 1.2.1, required calibration values on fission preducts from the thermal neutron fission of 235, When these were not available, or only recently obtained, comparison analyses between LASL and NRDL provided the necessary factors, a AN BUENO v