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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.
Radiation Protection Dosimetry
|October 22, 2016
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.
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.
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