Abstract

A diffusion-based 3-D transport code DIF3D is employed to model the spatial distribution of radiative energy density due to a collection of volumetric, isotropic sources. The results are presented in the form of 3-D isosurface plots, which give the surfaces of constant energy density. It is shown that as the detector sensitivity decreases, the individual sources cannot be spatially distinguished, thus leading to a false target effect. A comparison of DIF3D with the discrete-ordinates finite-element code ONEDANT¹ indicates that the diffusion approximation holds for a single-scattering albedo of 0.97 or higher. The significance of the optical depth and asymmetry parameters is also investigated.

© 1985 Optical Society of America