Effect of scattering anisotropy on the optimal choice of parameters for tracklength biasing

An approximate theoretical formulation is presented which leads to an analytical expression for the optimal tracklength biasing parameter as a function of the scattering probability and the scattering anisotropy. This shows the sensitive dependence of the optimal parameters on the scattering anisotropy. The implications of these findings on the Monte Carlo simulation of deep-penetration problems are discussed. (author)