Decay Rate and Decay Heat Data from Fission Products

Decay rate data of mixed fission products are presented from thermal neutron fission of ²³³U, ²³⁵U, and ²³⁹Pu and from fast fission of ²³⁸U and ²³²Th in the absence of neutron absorption by the fission products. The effect of neutron absorption by the fission products on decay rate is shown to be relatively small for conditions that exceed current light water reactor conditions. Decay heat data from fission products of ²³³U and ²³²Th in the absence of neutron absorption are provided which supplement similar data for ²³⁵U, ²³⁸U, and ²³⁹Pu given in the new American National Standards Institute/American Nuclear Society 5.1 Standard.