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Discrete Angle Biasing in Monte Carlo Radiation Transport

S. N. Cramer

Nuclear Science and Engineering / Volume 98 / Number 4 / April 1988 / Pages 279-298

Technical Paper / dx.doi.org/10.13182/NSE88-A23530

An angular biasing procedure is presented for use in Monte Carlo radiation transport with discretized scattering angle data. As in more general studies, the method is shown to reduce statistical weight fluctuations when it is combined with the exponential transformation. This discrete data application has a simple analytic form that is problem independent. The results from a sample problem illustrate the variance reduction and efficiency characteristics of the combined biasing procedures, and a large neutron and gamma-ray integral experiment is also calculated. A proposal is given for the possible code generation of the biasing parameter p and the preferential direction Ω0 used in the com-bined biasing schemes.