SUMMARY

There are a variety of uses for reference neutron fields including detector response and dosimeter studies. The Georgia Institute of Technology has a Cf-252 spontaneous fission source and an AmBe (alpha, n) source available for use in its research programs. In addition, it has iron, lead, beryllium, tantalum, heavy water, and polyethylene spheres to modify the neutron energy distributions from these neutron sources. This research will characterize the neutron leakage spectra from the spherical shells using state-of-the-art neutron spectrometry techniques. All the measurements will be modeled with Monte Carlo codes. The calculations will be used to provide further insight into the neutron spectra as modified by the spheres. The characterization of these modified sources will provide the data needed to use the resulting neutron fields in other research activities.