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Long term OSLD reader stability in the ACDS level one audit.

Andrew D C Alves1, Jessica Lye, John Kenny

  • 1Australian Clinical Dosimetry Service, Yallambie, VIC, 3085, Australia, andrew.alves@arpansa.gov.au.

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The Australian Clinical Dosimetry Service (ACDS) assessed optically stimulated luminescence dosimeters (OSLD) for radiotherapy audits. Readout stability varied, influenced by mechanical wear and OSLD stock, impacting audit scoring levels.

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Area of Science:

  • Medical Physics
  • Radiotherapy Dosimetry
  • Quality Assurance

Background:

  • The Australian Clinical Dosimetry Service (ACDS) conducts national radiotherapy clinic audits.
  • Optically stimulated luminescence dosimeters (OSLD) are used for these audits, requiring mailed exposure and return for analysis.

Purpose of the Study:

  • To investigate the stability of the OSLD readout process under the high workload of a national dosimetry audit.
  • To identify factors contributing to readout uncertainty and their impact on audit scoring.

Main Methods:

  • Analysis of OSLD readout data from 13 audit batches, each containing 200-400 dosimeters.
  • Measurement of readout standard deviation and element correction factor (ECF) distributions.
  • Investigation of potential causes for readout variability, including mechanical wear.

Main Results:

  • OSLD readout standard deviation varied between 0.5% and 0.9% across audit batches.
  • Mechanical wear on the readout adapter was identified as a potential cause of variability.
  • Fluctuations in ECF distributions were observed, not directly linked to readout uncertainty.

Conclusions:

  • Readout stability of OSLDs is crucial for accurate radiotherapy dosimetry audits.
  • Variability in OSLD stock, not readout uncertainty, appears to drive fluctuations in ECF distributions.
  • Future audits must monitor readout stability to ensure continued accuracy and appropriate scoring.