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Related Experiment Videos

Neutron Flux Intercomparison at NBS.

Kenneth C Duvall1, Michael M Meier1, Oren A Wasson1

  • 1Center for Radiation Research, National Bureau of Standards, Washington, DC 20234.

Journal of Research of the National Bureau of Standards (1977)
|September 27, 2021
PubMed
Summary

The National Bureau of Standards compared neutron flux measurement techniques using two detectors. Results provide crucial data for international standards in neutron metrology.

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Conference Reports: CONFERENCE ON FIFTY YEARS WITH NUCLEAR FISSION Washington, DC and Gaithersburg, MD April 25-28, 1989.

Journal of research of the National Institute of Standards and Technologyยท2017
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Area of Science:

  • Nuclear physics
  • Metrology
  • Neutron detection

Background:

  • Accurate neutron flux measurements are critical for nuclear applications and research.
  • International intercomparisons ensure consistency and accuracy of standards across laboratories.
  • The National Bureau of Standards (NBS) participated in a BIPM-sponsored neutron flux intercomparison.

Purpose of the Study:

  • To determine the efficiencies of two neutron transfer detectors.
  • To compare NBS measurements with those from other international standards laboratories.
  • To validate measurement techniques for neutron flux intercomparisons.

Main Methods:

  • Utilized a gas-filled Helium-3 (3He) proportional counter and a Boron-10 Trifluoride (BF3) counter in a polyethylene sphere.
Keywords:
Calibration standardsefficiencyinternational comparisonsneutron detectorsneutron flux

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  • Determined detector efficiencies at specific neutron energies (250 keV and 560 keV).
  • Employed an NBS "black" detector for flux monitoring and a secondary BF3 counter for normalization due to detector shadowing.

    • Main Results:

    • Reported the determined efficiencies for both the 3He and BF3 detectors.
    • Quantified the performance of the transfer instruments at the specified neutron energies.
    • Provided comparative data against results from other participating standards laboratories.

    Conclusions:

    • The study successfully determined and reported detector efficiencies for neutron flux intercomparison.
    • The results contribute to the international standardization of neutron metrology.
    • Validated NBS participation and measurement capabilities within the BIPM framework.