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The following analysis was performed using NJOY 2021 with ENDF/B.VII.0 cross section library.
Figure 1. Neutron damage function in Bi as a function of neutron energy for selected displacement energy thresholds (from 5 eV to 50 eV)
The neutron damage function in Bi, in case of displacement threshold energy above 45 eV, exhibits a different behavior for energy lower than 2x10-3 MeV with respect to those obtained at other (lower) energy thresholds.
Figure 2. Neutron damage function in Si as a function of neutron energy for selected displacement energy thresholds (from 5 eV to 50 eV)