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Public Health England (PHE) developed a method to test thermoluminescent dosemeters (TLDs) for neutron insensitivity. This ensures accurate radiation monitoring by thermalizing fast neutrons using water phantoms and an americium-beryllium source.

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Area of Science:

  • Medical Physics
  • Radiation Dosimetry

Background:

  • Public Health England (PHE) utilizes Harshaw™ thermoluminescent dosemeters (TLDs) for individual radiation monitoring.
  • The TLDs employ high-sensitivity lithium fluoride (LiF:Mg,Cu,P) and are read by Harshaw 8800™ automated readers.
  • PHE uses a (6)Li-depleted TLD material for neutron-insensitive photon dosimetry, requiring separate neutron and photon dosemeters.

Purpose of the Study:

  • To establish a reliable method for testing the neutron insensitivity of TLDs supplied annually.
  • To ensure the accuracy and reliability of radiation dose measurements for individual monitoring.

Main Methods:

  • A thermal neutron field is generated by sandwiching TLDs between two ISO water-filled slab phantoms.
  • Fast neutrons from an Americium-Beryllium (Am-Be) source are effectively thermalized within the water phantoms.
  • The method involves testing the TLDs' response to thermal neutrons, as (6)Li TLDs are sensitive to thermal neutrons.

Main Results:

  • The described method successfully thermalizes fast neutrons from an Am-Be source.
  • Supporting MCNP (Monte Carlo N-Particle) calculations validate the thermalization process.
  • Typical results demonstrating the effectiveness of the testing method are presented.

Conclusions:

  • The adopted method provides a simple and effective means to verify the neutron insensitivity of TLDs.
  • This quality control measure is crucial for maintaining the integrity of PHE's individual monitoring service.
  • Accurate radiation dosimetry relies on the precise calibration and testing of monitoring equipment.