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Effect of X-ray High-voltage Variations on the Conversion Coefficients.

B Behnke1, O Hupe1, R Behrens1

  • 1Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, D-38166 Braunschweig, Germany.

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Summary

This study determined the maximum allowable deviation in high-voltage (HV) tube potential for X-ray fields to meet ISO 4037 standards. Results propose new upper limits for HV deviation to ensure accurate radiation dose determination.

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Area of Science:

  • Medical Physics
  • Radiation Dosimetry
  • Metrology

Background:

  • Conversion coefficients (CCs) are crucial for radiation protection dose determination.
  • International standard ISO 4037 specifies X-ray field reference criteria based on CCs.
  • Deviations in high-voltage (HV) tube potential affect X-ray spectra and CCs.

Purpose of the Study:

  • To investigate the maximum allowable deviation of HV tube potential from its nominal value.
  • To ensure adherence to the ISO 4037 standard for reference X-ray fields.
  • To propose updated upper limit values for HV deviation in future ISO 4037 revisions.

Main Methods:

  • Utilized synthetic X-ray spectra generated via software simulation.
  • Employed measured spectra from Physikalisch-Technische Bundesanstalt X-ray facilities.
  • Analyzed the impact of HV potential variations on X-ray spectra and CCs.

Main Results:

  • Quantified the relationship between HV deviation and CCs.
  • Identified the maximum permissible HV deviations to maintain CCs within the 2% ISO 4037 tolerance.
  • Established new proposed upper limit values for HV deviation.

Conclusions:

  • HV tube potential stability is critical for accurate X-ray dosimetry.
  • The proposed upper limits for HV deviation will enhance the reliability of reference X-ray fields.
  • Implementation of these findings in ISO 4037 will improve radiation protection practices.