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Multigroup discrete ordinates modeling of 125I 6702 seed dose distributions using a broad energy-group cross section representation

Medical Physics, 2002
Our purpose in this work is to demonstrate that the efficiency of dose-rate computations in 125I brachytherapy, using multigroup discrete ordinates radiation transport simulations, can be significantly enhanced using broad energy group cross sections without a loss of accuracy.
Daskalov, G. M. +3 more
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Energy conservation and H-theorem in the scalar nonlinear Boltzmann equation and in its multigroup representation

Physics Letters A, 1990
Abstract A multigroup representation of the scalar nonlinear Boltzmann equation is given. In analogy to the properties of a well-formulated scattering kernel of the Boltzmann equation, the symmetries of the scattering coefficients, governing energy conservation and the H -theorem in the multigroup model, are discussed and illustrated by two examples.
Georg Kügerl, Ferdinand Schürrer
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SECOND-ORDER MULTIGROUP MODEL FOR CALCULATING LOW-ENERGY ELECTRON TRANSPORT IN WEAKLY IONIZED GASES

Физика плазмы / Plasma Physics Reports
Proceeding from the Boltzmann kinetic equation for electrons, the system of multigroup equations for the zeroth, first and second moments of the electron distribution function is derived. The system includes equations for the balance of concentration, flux density and momentum flux density of electrons, and it is intended for numerical simulations of ...
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Multigroup system of constants for calculating high-energy neutron transport