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In this paper an exposure build-up factor formulation is reported by solving the photon transport equation in a heterogeneous slab by the LTS N  method, assuming the Klein-Nishina scattering kernel as the scattering differential cross section as well as the multigroup model in the wavelength variable. Numerical simulations and comparisons with available results in the literature are presented for different compositions containing water, iron and lead.

Determination of the exposure build-up factor in a slab using the LTS N method