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PHOTON FIELD OF ~100-200 KEV FOR ENVIRONMENTAL DOSEMETER CALIBRATION.

S M Tajudin1, Y Namito2, T Sanami2

  • 1Faculty of Health Sciences, Universiti Sultan Zainal Abidin (UniSZA), 21300 Kuala Nerus, Terengganu, Malaysia.

Radiation Protection Dosimetry
|January 18, 2020
PubMed
Summary
This summary is machine-generated.

A novel backscattered photon field utilizing a 137Cs gamma source provides a uniform 190 keV energy spectrum. This method effectively calibrates environmental survey meters for accurate low dose rate measurements.

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Area of Science:

  • Nuclear Physics
  • Radiation Detection and Measurement

Background:

  • Radionuclides like 241Am, 137Cs, and 60Co are standard reference photon fields for dosemeter calibration.
  • Photon energies from tens of keV to MeV are crucial for environmental and medical dosimetry.
  • A 200 keV energy range is particularly important for environmental scattering photons and medical X-ray generators.

Purpose of the Study:

  • To develop a uniform photon field with a specific energy spectrum for dosemeter calibration.
  • To investigate the energy-dependent features of environmental survey meters.
  • To validate dosemeter readings using a newly developed backscattered photon field.

Main Methods:

  • Utilized a backscattered layout with an affordable 137Cs gamma source to generate a quasi-monoenergetic photon field.
  • Achieved a primary photon energy of 190 keV with a uniform spectra and dose rate.
  • Employed calibrated environmental CsI(Tl) survey meters (Horiba PA-1000, Mr. Gamma A2700) for measurements.

Main Results:

  • The developed backscattered layout successfully produced a uniform photon field at 190 keV.
  • Measurements confirmed the sensitivity of scintillator instruments to low dose rates at this energy.
  • Energy-dependent features of the survey meters were understood in the 100-200 keV range.

Conclusions:

  • The backscattered photon field is effective for calibrating environmental survey meters.
  • The method provides accurate readings for low dose rates at 190 keV.
  • This technique enhances the reliability of radiation detection instruments in environmental applications.