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POLYETHYLENE FILTER FOR THE TNF2 THERMAL NEUTRON FACILITY.

Achilles Astuto1, Karla C S Patrão2, Evaldo S Fonseca2

  • 1Universidade Federal do Rio de Janeiro - COPPE/UFRJ. Av. Horácio Macedo, 2030, Bloco G/Sala 206 - Centro de Tecnologia - Cidade Universitária, Ilha do Fundão, Rio de Janeiro 21941-914, RJ, Brasil.

Radiation Protection Dosimetry
|December 15, 2022
PubMed
Summary

A new polyethylene filter enables external calibration of personal dosemeters and neutron survey meters using the Standard Thermal Neutron Flux Unit (TNF2). This modification overcomes previous limitations in calibrating neutron detection equipment.

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Area of Science:

  • Nuclear physics
  • Radiation detection and measurement

Background:

  • The Standard Thermal Neutron Flux Unit (TNF2) at LNMRI/IRD was established for calibrating neutron detectors and survey meters.
  • Initial design limitations, specifically small channel dimensions, prevented the calibration of personal dosemeters and survey meters for thermal neutrons.
  • The facility utilizes four 241Am-Be sources moderated by a graphite core and surrounded by paraffin/graphite blocks to achieve neutron fluence.

Purpose of the Study:

  • To modify the TNF2 facility to enable external irradiation of personal dosemeters and neutron survey meters.
  • To overcome the limitations of small channel dimensions for calibrating neutron detection devices.

Main Methods:

  • Construction of a polyethylene filter composed of 29 stacked discs with varying diameters (5 to 34 cm).
  • Simulation of different filter thicknesses to achieve the desired thermal neutron irradiation effects.
  • Experimental testing of the new irradiation configuration and comparison with MCNPX simulation results.

Main Results:

  • Development of a functional polyethylene filter system for external calibration.
  • Validation of the filter's performance through experimental testing and simulation.
  • Successful adaptation of the TNF2 facility for a broader range of neutron dosemeter and survey meter calibrations.

Conclusions:

  • The polyethylene filter effectively modifies the TNF2 facility to allow external calibration of personal dosemeters and neutron survey meters.
  • This enhancement significantly expands the utility of the TNF2 facility for neutron metrology.
  • The results confirm the reliability of the MCNPX simulations for predicting filter performance.