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Isotropic neutron scattering in the laboratory system is assumed.
Either a reflecting or vacuum boundary can be chosen. The velocity and space variables are replaced by discrete values. Scattering and collision probability matrices are computed and the neutron balance equation is solved by iterative techniques. A combination of a Gauss iteration, renormalization and extrapolation is used to accelerate convergence. An additional 10 isotopes can be specified for activation calculations and cross section averaging.