An investigation has been carried out concerning the transmission of thermal and fast neutrons in air filled annular ducts through laminated Fe-D2O shields. Measurements have been made with annular air gaps of 0.5, 1.0, 1.5 and 2. 0 cm, at a duct length of half a meter the neutron fluxes was determined with a foil activation technique.nThe thermal flux was theoretically and experimentally divided into three components, a streaming, a leakage and an albedo component. The fast flux was similarly divided into a streaming component and a "leakage" component. A calculation model to predict the components was then developed and fitted to the data obtained by experiments.
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