Abstract
Detailed knowledge of fast neutron interactions is important for conceptual designs of blankets for thermonuclear reactors. A Monte Carlo calculation, based on a collision density approach, was made of the energy and spatial flux distribution in water from a 14.7 MeV neutron fusion source. The results are compared with an earlier moments method solution of the Boltzmann equation. A concurrent experimental study by a threshold detector technique proved relatively ineffective at determining accurate flux spectra near the neutron source because of the dominant influence of uncollided flux. Reasonable agreement between experiment and theory was found, however, in a comparison of measured activation integrals and ones computed from both the Monte Carlo and the moments method results.