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Related Experiment Video

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Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
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Evaluation of ionization chamber stability checks using various sources.

Autumn E Walter1, Jon B Hansen1, Larry A DeWerd1

  • 11111 Highland Ave, Department of Medical Physics, School of Medicine and Public Health, University of Wisconsin, Madison, WI 53705, USA.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
|November 29, 2020
PubMed
Summary

Ionization chamber stability can be effectively monitored using common clinical tools like strontium-90 (Sr-90) check sources or linear accelerator beams, offering comparable precision to cobalt-60 (Co-60) irradiators.

Keywords:
Check sourceIonization chambersLinear acceleratorQA

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Dosimetry

Background:

  • Regular calibration and stability checks of ionization chambers are crucial for accurate radiation therapy.
  • Traditional stability checks often rely on cobalt-60 (Co-60) irradiators, which are not universally available in clinical settings.
  • Alternative methods using more common clinical equipment are needed to ensure reliable dosimetry.

Purpose of the Study:

  • To compare the precision and efficiency of using strontium-90 (Sr-90) check sources versus linear accelerator (LINAC) beams for monitoring ionization chamber stability.
  • To evaluate these methods against the established benchmark of Co-60 irradiator measurements.
  • To provide clinical physicists with data to inform their choice of stability monitoring techniques.

Main Methods:

  • Ionization chamber stability was assessed using a Sr-90 beta-emitting check source and a 6 MV photon beam from a LINAC.
  • Measurements were performed using a Constancy Check Phantom with three ionization chambers: Exradin A28, Wellhofer IC69, and Exradin A12.
  • Stability was evaluated by individual charge readings and charge ratios, with results compared to Co-60 measurements using NEL 2571, PTW N30001G, and Exradin A12 chambers.

Main Results:

  • Individual charge reading stability was within ±1.0% for Sr-90 measurements and ±0.5% for external beam measurements (including Co-60).
  • The standard deviation of mean charge ratios ranged from 0.15% to 0.40% for Sr-90 and 0.10% to 0.30% for external beam measurements.
  • Both Sr-90 and LINAC external beam methods demonstrated high precision for assessing ionization chamber stability.

Conclusions:

  • Strontium-90 (Sr-90) check sources and linear accelerator (LINAC) beams are precise and efficient methods for monitoring ionization chamber stability in clinical settings.
  • These commonly available tools offer a viable alternative to less accessible Co-60 irradiators for routine chamber quality assurance.
  • The findings support informed decision-making for clinical physicists regarding ionization chamber stability monitoring protocols.