If the characteristic scale of the random inhomogeneities is much larger than the wavelength of the incident wave, multiple forward scattering becomes dominant at large travel distances.
For channels with even higher Δ j, that are not probed in this work, scattering becomes predominantly backward scattered.
Therefore, at energies greater than ∼30 keV, Compton scattering becomes the dominant interaction.
In this situation, light scattering becomes stronger and its spatial distribution becomes more strongly fluctuated.
Even though the diffusion approximation is a very effective way of approximating multiple scattering, this sampling technique becomes expensive for highly translucent materials.
In the DA, one assumes that the light becomes nearly isotropic due to strong multiple scattering.
Although the method only evaluates the diffuse approximation (due to multiple scattering) and ignores the single scattering term (due to single scattering), the diffuse term dominates when reduced scattering coefficient is much larger than absorption coefficient.
Random lasers get gain from multiple scattering.
In our case; a higher turbidity of the sample led to more multiple scattering events and the diffusively illuminated area towards the back end of the sample became bigger.
