PowerPoint Presentation

1. I need to be efficient, energy discretization

Remember:

Energy discretization is realistic if cross sections do not vary considerably

within each group and appropriate f(E) is very important

Acuros (for

192

Ir) uses an adaptive G=37 group cross section set.

For the uncollided component all 37 groups are used, with

For the collided (scattered) component, this group is collapsed applying an appropriate

(proprietary) energy weighting function f(E).

Acuros uses cross section generated by CEPXS, a multigroup-Legendre cross-section

generating code.

CEPXS does not include coherent scattering and uses the Klein-Nishina incoherent

scattering cross sections.

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