substantial number of researchers, and almost every radiation model has been applied to
this type of problem [eg, Monte Carlo method (Perlmutter and Howell1), flux method (Lowes
et al. 2), zone method (Steward and Tennankora3), discrete ordinates method (Fiveland4),
Galerkin finite element method (Fernandes and Francis5), and spherical harmonic method
(Mengiig and Viskanta6)]. As an additional small sample of the extensive recent literature on …