“…In recent years it has been observed a growing interest towards the stochastic Monte Carlo method for the solution of the direct problem (Maurente et al, 2007;Chen and Liou, 2006;Battaglia and Mantovani, 2005;Postylyakov, 2004Postylyakov, , 2004a, as well as towards variations of the Discrete Ordinates Method (Çayan and Selçuk, 2007;Chalhoub, 2003Chalhoub, , 2005 which was originally proposed by Wick (1943) and Chandrasekhar (1944Chandrasekhar ( , 1950. Moreover, some researchers have performed comparisons of different solution strategies in order to identify accurate and fast methods to be used both in the direct and inverse radiative transfer problems (Jensen et al, 2007;Bulgarelli and Doyle, 2004;Chalhoub et al, 2003).…”