AbstractSpectral neutron and photon fluxes from iron assemblies irradiated with 14 MeV neutrons were measured. The geometry of the experiment was chosen so as to be sensitive to shield penetration problems of fusion reactor design. The results are compared with Monte Carlo calculations (code MCNP) based on the data libraries EFF-1, EFF-2 and FENDI-l. A solid iron slab, as well as a slab with a vertical gap at different positions, were investigated. Systematic tendencies are discussed.