4. METHOD OF SOLUTION
In the case of gamma radiation the calculations are based on the Compton effect. The energy and angle dependency of the energy of the scattered photons and the albedo factors for the scattering is based on generally available literature.
In the case of neutrons the programs are valid only for fast neutrons. This is the range of validity of the albedo factors in the literature which describe the energy and angle dependencies of the scattered fast neutrons. The loss of energy of the neutrons due to scattering at the surface is neglected.