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Development of a Bonner Sphere neutron spectrometer from a commercial neutron dosimeter

  • Author(s): Chu, MC;
  • Fung, KY;
  • Kwok, T;
  • Leung, JKC;
  • Lin, YC;
  • Liu, H;
  • Luk, KB;
  • Ngai, HY;
  • Pun, CSJ;
  • Wong, HLH
  • et al.
Abstract

Bonner Spheres have been used widely for the measurement of neutron spectra with neutron energies ranged from thermal up to at least 20 MeV . A Bonner Sphere neutron spectrometer (BSS) was developed by extending a Berthold LB 6411 neutron-dose-rate meter. The BSS consists of a 3He thermal-neutron detector with integrated electronics, a set of eight polyethylene spherical shells and two optional lead shells of various sizes. The response matrix of the BSS was calculated with GEANT4 Monte Carlo simulation. The BSS had a calibration uncertainty of ± 8.6% and a detector background rate of (1.57 ± 0.04) × 10-3 s-1. A spectral unfolding code NSUGA was developed. The NSUGA code utilizes genetic algorithms and has been shown to perform well in the absence of a priori information.

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