A neutron facility at the University of Ontario Institute of Technology (UOIT) is described. Radiation fields around a DT neutron generator have been simulated. Spectral distributions of neutron emissions as well as radiation dose rates have been calculated for a neutron generator of 1.1010 n/s intensity and 14.2 MeV energy. The simulations have been performed at different locations around the neutron generator inside and outside a heavily shielded room. Additional shielding composition around the generator has been optimized to meet the regulatory requirements. A modern Monte Carlo code (MCNPX 2.7.E) has been used for simulations. Special features of the MCNPX code as variant reduction techniques to improve the simulation quality have been used and described. A linear motion system to control the position of the generator is also described.

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