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 journalArticle

Abstract

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
Volume929
DOIs
StatePublished - Jun 11 2019
Externally publishedYes

Fingerprint

Proportional counters
proportional counters
Phosphors
scintillation counters
Neutrons
neutrons
Polyethylenes
Liquids
liquids
polyethylenes
Neutron sources
organic liquids
neutron sources
slabs
Experiments
simulation

Keywords

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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

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title = "Comparative neutron detection efficiency in He-3 proportional counters and liquid scintillators",
abstract = "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.",
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author = "Pozzi, {S. A.} and Clarke, {S. D.} and M. Paff and {Di Fulvio}, A. and Kouzes, {R. T.}",
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T1 - Comparative neutron detection efficiency in He-3 proportional counters and liquid scintillators

AU - Pozzi, S. A.

AU - Clarke, S. D.

AU - Paff, M.

AU - Di Fulvio, A.

AU - Kouzes, R. T.

PY - 2019/6/11

Y1 - 2019/6/11

N2 - 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.

AB - 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.

KW - Detector characterization

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KW - He-3

KW - Neutron detection

KW - Organic scintillator

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