The loss of radiance from a beam of radiance L traversing a thickness ds of a medium is and the single scattering albedo is thus the ratio of the scattering coefficient to the extinction coeff...The loss of radiance from a beam of radiance L traversing a thickness ds of a medium is and the single scattering albedo is thus the ratio of the scattering coefficient to the extinction coefficient. Single scattering albedo is the property of a surface or a layer, and may be regarded as the fundamental albedo, since all albedos that will be derived here from a given definition or reflectance rule will contain at least one instance of ϖ 0 .