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Neutron-gamma pulse shape discrimination using organic scintillators with silicon photomultiplier readout

Journal Article


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Abstract


  • Neutron/Gamma pulse shape discrimination (PSD) was measured using stilbene and EJ-299-34 plastic scintillators with readout by silicon photomultipliers (SiPMs). The SiPM pulses were digitized and processed for energy and pulse shape information using a digital technique performing numerical weighted integrations on each pulse. A genetic algorithm (GA) was developed to optimize the weighting vectors used for the pulse shape discrimination. Efficient PSD was obtained down to an electron-equivalent energy of 127 keV with stilbene and 391 keV with the EJ-299-34 PSD plastic. Separation at lower energies was possible at reduced detection efficiency, down to 78 keV and 186 keV at 50% efficiency. The detectors were used to measure separated gamma and neutron spectra from an Americium-Beryllium neutron source and from a Na-22 gamma source. The GA-optimized weighted integration was compared with digital charge comparison (DCC). The GA exhibited slightly improved performance with a 400 MSps digitization rate and showed a significant advantage at sample rates below 100 MSps.

Authors


  •   Eberhardt, John E. (external author)
  •   Preston, Rhys M. (external author)
  •   Tickner, James R.

Publication Date


  • 2014

Citation


  • Preston, R. M., Eberhardt, J. E. & Tickner, J. R. (2014). Neutron-gamma pulse shape discrimination using organic scintillators with silicon photomultiplier readout. IEEE Transactions on Nuclear Science, 61 (4), 2410-2418.

Scopus Eid


  • 2-s2.0-84906781060

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3898&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2889

Has Global Citation Frequency


Number Of Pages


  • 8

Start Page


  • 2410

End Page


  • 2418

Volume


  • 61

Issue


  • 4

Abstract


  • Neutron/Gamma pulse shape discrimination (PSD) was measured using stilbene and EJ-299-34 plastic scintillators with readout by silicon photomultipliers (SiPMs). The SiPM pulses were digitized and processed for energy and pulse shape information using a digital technique performing numerical weighted integrations on each pulse. A genetic algorithm (GA) was developed to optimize the weighting vectors used for the pulse shape discrimination. Efficient PSD was obtained down to an electron-equivalent energy of 127 keV with stilbene and 391 keV with the EJ-299-34 PSD plastic. Separation at lower energies was possible at reduced detection efficiency, down to 78 keV and 186 keV at 50% efficiency. The detectors were used to measure separated gamma and neutron spectra from an Americium-Beryllium neutron source and from a Na-22 gamma source. The GA-optimized weighted integration was compared with digital charge comparison (DCC). The GA exhibited slightly improved performance with a 400 MSps digitization rate and showed a significant advantage at sample rates below 100 MSps.

Authors


  •   Eberhardt, John E. (external author)
  •   Preston, Rhys M. (external author)
  •   Tickner, James R.

Publication Date


  • 2014

Citation


  • Preston, R. M., Eberhardt, J. E. & Tickner, J. R. (2014). Neutron-gamma pulse shape discrimination using organic scintillators with silicon photomultiplier readout. IEEE Transactions on Nuclear Science, 61 (4), 2410-2418.

Scopus Eid


  • 2-s2.0-84906781060

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3898&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2889

Has Global Citation Frequency


Number Of Pages


  • 8

Start Page


  • 2410

End Page


  • 2418

Volume


  • 61

Issue


  • 4