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(⁹³Nb(n,2n) ^92mNb), and silicon (²⁸Si(n,p) ²⁸Al)) have extremely large cross sections for the capture of neutrons within a very narrow band of energy. Use of multiple absorber samples allows characterization of the neutron energy spectrum. Activation also enables the reconstruction of historic neutron exposures (e.g., forensic reconstruction of neutron exposures during an accidental criticality).
* Elastic scattering

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