Comparative neutron detection efficiency in He-3 proportional counters and liquid scintillators

S. A. Pozzi, S. D. Clarke, M. Paff, A. Di Fulvio, R. T. Kouzes

Research output: Contribution to journalArticlepeer-review


We present new results on the neutron detection efficiency of detection systems based on He-3 proportional counters compared to organic liquid scintillators. The experiments were conducted using a well-characterized Cf-252 neutron source, measured bare, and shielded with slabs of polyethylene. The results show that the intrinsic neutron detection efficiency for the bare source is approximately 25% for the He-3 system, and 67% for the liquid scintillator system. When polyethylene sheets were used to shield the source in 2.54 cm increments, the neutron detection efficiency of both systems decreased exponentially to approximately 10% for the case of 25.4 cm. Experimental results were simulated using MCNPX-PoliMi and good agreement was found between measurement and simulation results for all the cases considered here.

Original languageEnglish (US)
Pages (from-to)107-112
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
StatePublished - Jun 11 2019
Externally publishedYes


  • Detector characterization
  • Efficiency
  • He-3
  • Neutron detection
  • Organic scintillator

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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