In the calculation of flux weighted multigroup neutroncross-sections of a nuclide present in a homogeneous mixture ofseveral nuclides, by the well known Bondarenko approach, thecontributions from the other nuclides to the flux Weighting function,are contained in a parameter called 'dilution'. Under the narrowResonance approximation and with assumed non-overlap of resonances,the energy Fluctuations of the dilution are usually ignored within anenergy group.
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