The total detector efficiency and the efficiencies of individual rings. The detector efficiency curves were simulated by neutron-evaporation spectra and monochromatic neutrons. The red dots are given by the neutron spectrum described by the Maxwell-Boltz (IMAGE)

Nuclear Science and Techniques

The total detector efficiency and the efficiencies of individual rings. The detector efficiency curves were simulated by neutron-evaporation spectra and monochromatic neutrons. The red dots are given by the neutron spectrum described by the Maxwell-Boltz

Caption

Based on the described detector structure, Geant4 simulations were conducted. The total detector efficiency increased from 35.6% at 50 keV to 42.3% at 1.65 MeV for the average neutron energy, then gradually decreased to 40.7% at 3 MeV. Notably, calibration with a 252Cf source yielded an efficiency of 42.1 ± 1.3% at 2.13 MeV, corresponding to the average energy of the 252Cf neutron spectrum, which is marked on the curve.

Credit

Chun-Wang Ma

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