CALCULATED NEUTRON AND GAMMA-RAY ENERGY SPECTRA FROM 14 MeV NEUTRONS STREAMING THROUGH AN IRON DUCT: COMPARISON WITH EXPERIMENT.

To be confident of radiation transport calculations of neutrons and gamma rays streaming through the ducts and other penetrations in the blanket shield assembly of a fusion reactor, it is necessary to have experimental data against which the results of calculations may be compared. Integral experiments that measure the streaming of approximately equals 14-Mev neutrons through a 0. 30-m-diam iron duct (length-to-diameter ratio approximately equals 3) imbedded in a concrete shield have been carried out at the Oak Ridge National Laboratory. Calculated and measured neutron and gamma-ray energy spectra are compared at 16 detector locations on and off the cylindrical axis of the duct. Refs.