Monochromatic scattering is studied in a semi-infinite 0 ≥ z ≤ ∞ multicomponent medium with a scattering coefficient σ and an extinction coefficient k which are functions of z with σ/k≠const. The cases of large and small inhomogeneity gradients are analyzed. A perturbation theory is worked out in terms of the number of scattering events by the inhomogeneity, introduced into an originally homogeneous medium with σ/k=const. All the scattering events in the original medium are taken into account exactly.
Scientific-Research Institute of Nuclear Physics
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