Abstract
A 20 MeV electron Linac based neutron beam has been shaped for neutron activation analysis (NAA) technique. A beam shaping assembly (BSA) has been simulated using MCNPX2.6 code to increase the thermal neutron flux and decrease the epithermal and fast neutrons as much as possible at the beam port for NAA facility. Final BSA containing 1.5 cm tungsten as photoneutron target, 7 cm BeD2 and 4 cm polyethylen as moderators surrounded by BeO as reflector as well as 6 cm PE as collimator layer provides 1.67 × 1010 (n/cm2 mA) at the beam port. The results of final configuration show that the proposed system leads to increasing of thermal to epithermal and thermal to fast neutron flux up to approximately 5.29, 6.22, respectively.
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