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Technical Note: Response time evolution of XR-QA2 GafChromic™ film models
Saad Aldelaijan1,2,3,4, Nada Tomic2,3, Pavlos Papaconstadopoulos2,3
1Department of Biomedical Engineering, Montreal Neurological Institute, Montréal, Québec, H3A 2B4, Canada.
Medical Physics
|November 23, 2017
Summary
The new XR-QA2 GafChromic™ film shows a significantly more stable postexposure response than the older XR-QA (Version 2) model, with minimal signal variation within hours of irradiation.
Area of Science:
- Medical Physics
- Radiation Dosimetry
Background:
- GafChromic™ films are widely used for radiation dosimetry.
- Understanding film response stability is crucial for accurate dose measurements.
Purpose of the Study:
- Compare the postexposure signal growth and energy response of the XR-QA2 film to the XR-QA (Version 2) model.
- Evaluate the stability of the newest GafChromic™ film for dosimetry applications.
Main Methods:
- Irradiated XR-QA and XR-QA2 films with various beam qualities (5.3-8.25 mm Al) up to 12 cGy.
- Measured net reflectance at different time points postirradiation (2 min to 5 months).
- Analyzed signal changes and energy response for both film models.
Main Results:
- XR-QA2 film signal saturated within 15 hours postirradiation.
- Net reflectance variation for XR-QA2 was within 3% for scans from 2 min to 3 h postexposure.
- After several months, XR-QA2 showed only a 1% difference in response, while XR-QA (Version 2) showed up to 8%.
Conclusions:
- The XR-QA2 film exhibits a significantly more stable postexposure response compared to the XR-QA (Version 2) model.
- Bismuth oxide in XR-QA2 contributes to improved signal stability over time.
- XR-QA2 is a more reliable radiochromic film for dosimetry due to its enhanced stability.
