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Related Experiment Videos

WENDI: an improved neutron rem meter.

R H Olsher1, H H Hsu, A Beverding

  • 1Health Physics Measurements Group, Los Alamos National Laboratory, NM 87545, USA. dick@lanl.gov

Health Physics
|July 26, 2000
PubMed
Summary

New neutron rem meters, Wide Energy Neutron Detection Instruments (WENDI), offer improved accuracy for real-time dose equivalent measurements across a wide energy range. These advanced instruments enhance high-energy response and sensitivity for diverse workplace environments.

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Area of Science:

  • Nuclear instrumentation
  • Radiation detection and measurement
  • Applied physics

Background:

  • Neutron rem meters are crucial for real-time neutron dose equivalent measurements, especially with unknown spectra.
  • Existing designs have limitations in accuracy at intermediate energies and lack high-energy response.
  • Angular dependence is an issue in some historical designs like the Andersson-Braun meter.

Purpose of the Study:

  • To develop and describe new neutron rem meter designs with enhanced accuracy from thermal energies to 5 GeV.
  • To improve the energy and angular response of neutron detection instruments.
  • To provide more accurate dosimetry for nuclear power plants and accelerator facilities.

Main Methods:

  • Design and optimization using Monte Carlo codes (MCNP, MCNPX, LAHET).

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  • Incorporation of tungsten or tungsten carbide powder in polyethylene moderator for neutron generation and absorption.
  • Development of two generations of Wide Energy Neutron Detection Instruments (WENDI-I and WENDI-II).

    • Main Results:

    • WENDI designs show improved accuracy over a wide energy range (thermal to 5 GeV).
    • WENDI-II exhibits significantly enhanced high-energy response (beyond 20 MeV) and increased sensitivity.
    • Measured energy response closely matches the Ambient Dose Equivalent per unit fluence function above 0.1 MeV.

    Conclusions:

    • The WENDI-II neutron rem meter is suitable for field use and has been commercialized.
    • The new designs overcome limitations of historical meters, offering superior performance.
    • Monte Carlo simulations accurately predicted the performance of the WENDI meters.