Article ID Journal Published Year Pages File Type
8176977 Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 2014 9 Pages PDF
Abstract
The pulse height spectra (PHS) determined from the curves of experimental efficiency as a function of the detector's high voltage (HV) and the MCNPX-simulated PHS were compared using a fitting routine that finds the best match between the experimental and simulated PHS by assuming a parametric model for the relation between HV (that determines the detector's gain) and the energy deposited in the gas. This led to express the experimental neutron efficiency as a function of the discrimination level set on the deposited energy (energy threshold). The detector sensitivity to γ-rays was also analyzed and the operational range in which the γ-ray contribution to the signal is not negligible was determined. It is found that this detector can reach a maximum neutron efficiency of ~1×10−3 counts/n at 2.5 MeV (UDD sub-unit) and of ~4×10−3 counts/n at 14 MeV (UDT and UDD sub-units).
Related Topics
Physical Sciences and Engineering Physics and Astronomy Instrumentation
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