Home / Store / Journals / Electronic Articles / Nuclear Science and Engineering / Volume 116 / Number 2
Thomas E. Booth
Nuclear Science and Engineering
Volume 116 / Number 2 / February 1994 / Pages 113-124
Format:electronic copy (download)
Quantities that depend on the collective effects of groups of particles cannot be obtained from the standard Boltzmann transport equation. Monte Carlo estimates of these quantities are called non-Boltzmann tallies and have become increasingly important recently. Standard Monte Carlo variance reduction techniques were designed for tallies based on individual particles rather than groups of particles. Experience with non-Boltzmann tallies and analog Monte Carlo has demonstrated the severe limitations of analog Monte Carlo for many non-Boltzmann tallies. In fact, many calculations absolutely require variance reduction methods to achieve practical computation times. A description is given of how variance reduction techniques can be applied when non-Boltzmann estimates are desired.
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