A.A. Gui, J.K. Shultis and R.E. Faw "Response Functions for Neutron Skyshine Analyses," Nuclear Science & Engineering, 125, 111-127, 1997.

Neutron and associated secondary photon line-beam response functions for point monodirectional neutron sources are generated using the MCNP Monte Carlo code for use in neutron skyshine analyses employing the integral line-beam method. The LBRFs are evaluated at 14 neutron source energies ranging from 0.01 to 14 MeV and at 18 emission angles from 1 to 170 degrees, as measured from the source-to-detector axis. The neutron and associated secondary-photon conical-beam response functions for azimuthally symmetric neutron sources are also evaluated at 13 neutron source energies in the same energy range and at 13 polar angles of source collimation from 1 to 89 degrees. The response functions are approximated by an empirical three-parameter function of the source-to-detector distance. These response function approximations are available for a source-to-detector distance up to 2500~m and, for the first time, give dose equivalent responses that are required for modern radiological assessments. For the conical-beam response functions, ground correction factors for neutrons and secondary photons are calculated and also approximated by empirical formulas for use in air-over-ground neutron skyshine problems with azimuthal symmetry. In addition, simple procedures are proposed for humidity and atmospheric density corrections.

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