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A detector efficiency model based on energy extraction from neutrons is described and used to compare 4 He detectors with liquid scintillators (EJ301/NE-213). Detector efficiency can be divided into three regimes: single neutron scattering, multiple neutron scattering, and a transition regime in-between. For an average fission neutron of 2MeV, the amount of 4 He needed would be about...
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