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Dosimetry for Cell Irradiation using Orthovoltage 40-300 kV X-Ray Facilities
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SU-E-T-101: Dosimetry Intercomparison for a Synchrotron-Produced Monochromatic X-Ray Beam
Tad Brown1,2, K R Hogstrom1,2, D Alvarez1,2
1Mary Bird Perkins Cancer Center, Baton Rouge, LA.
Medical Physics
|May 19, 2017
Summary
This study validated ion chamber dosimetry for synchrotron X-ray beams used in cancer therapy research. Results show accuracy within 7% for energies between 25-35 keV, ensuring reliable cell irradiation calibration.
Area of Science:
- Medical Physics
- Radiological Dosimetry
- Synchrotron Radiation Applications
Background:
- Accurate dosimetry is crucial for targeted radiation therapies.
- Photoactivated Auger electron therapy requires precise dose calibration.
- Synchrotron-generated monochromatic X-ray beams offer unique therapeutic potential.
Purpose of the Study:
- To perform a dosimetry intercomparison for synchrotron-produced monochromatic X-ray beams.
- To validate ion chamber measurements against Monte Carlo simulations for cell irradiation calibration.
- To assess the accuracy of dosimetry for photoactivated Auger electron therapy research.
Main Methods:
- Ion chamber depth-dose measurements in a PMMA phantom were conducted at 25 and 35 keV.
- MCNP5 Monte Carlo simulations calculated dose per fluence.
- Incident photon fluence was determined using NaI detector scattering measurements.
Main Results:
- At 35 keV, MCNP5-fluence underestimated ion chamber measurements by 1.8-4.8%.
- At 25 keV, MCNP5-fluence overestimated ion chamber measurements by 6.6-1.9%.
- Discrepancies were observed across PMMA depths from 0.6-7.7 cm.
Conclusions:
- TG-61 ion chamber dosimetry is accurate within approximately 7% for 25-35 keV X-ray beams.
- This validates the dosimetry method for calibrating cell irradiations.
- The findings support the development of synchrotron-based Auger electron therapy.
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