Integral Reaction Rate Determinations—Part I. Tailored Reactor Spectrum Preparation and Measurement

Four different epicadmium neutron flux spectra were produced by boron filter insertion in a beam port of the Cornell University 100-kW TRIGA reactor. The first spectrum was the unaltered (except for cadmium covers) fission slowing down spectrum; three hardened spectra were produced by the insertion of boron filters enriched in ¹⁰B. The shapes and amplitudes of the spectra were determined by the computer code SAND II to reproduce foil activation data obtained from a set of resonance and threshold detectors.