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Light Transport in Tissue Conservative scattering (a=1), semi-infinite slab If the slab is semi-infinite, the diffuse average radiance must be bounded as $\zeta\rightarrow\infty$. Hence c2=0 (4.101) The other constant c1 is determined using the boundary condition (4.90) $$c_1 = - A_{\mathrm{top}}Q'(0)-c_3(1+A_{\mathrm{top}}h'/\mu_0)$$ (4.102) Equations (4.101) and (4.102) determine the solution for a semi-infinite slab with conservative scattering.

S. A. Prahl."Light Transport in Tissue," PhD thesis, University of Texas at Austin, 1988.