Extrapolated endpoint for the uniform source half-space problem

The Wiener-Hopf technique is applied to obtain the solution for the extrapolated endpoint for an infinite half-space problem containing a uniform isotropic source, and this endpoint is compared to the Milne extrapolated endpoint. Another definition of extrapolated endpoint for use in diffusion theory based on the interior flux for the uniform source half-space problem is given and compared to the equivalent uniform source diffusion theory endpoint.