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High sensitivity radiochromic film dose comparisons
Martin J Butson1, Peter K N Yu, Tsang Cheung
1Department of Physics and Materials Science, City University of Hong Kong, Kowloon Tong, Hong Kong. butsonm@iahs.nsw.gov.au
Physics in Medicine and Biology
|December 13, 2002
Summary
Gafchromic HS film offers improved dose response compared to older Gafchromic films. While sensitivity decreases at lower x-ray energies, its dose characteristics are valuable for radiochromic dosimetry.
Area of Science:
- Medical Physics
- Radiation Dosimetry
- Radiological Imaging
Background:
- Radiochromic films are crucial for accurate radiation dose measurement.
- Gafchromic films, particularly the high sensitivity (HS) variant, are increasingly used.
- Understanding their dose and energy response is vital for clinical applications.
Purpose of the Study:
- To investigate the dose characteristics of Gafchromic HS film.
- To compare the dose and energy response of Gafchromic HS film with other Gafchromic types (MD-55-1, MD-55-2) and EDR-2 film.
Main Methods:
- Comparative analysis of dose and energy response across different film types.
- Evaluation of film sensitivity at various x-ray energies, including low energies.
- Measurement of optical density changes to determine dose response.
Main Results:
- Gafchromic HS film shows similar energy response to MD-55-1 and MD-55-2 films.
- HS film exhibits decreased sensitivity at lower x-ray energies (e.g., 28 keV effective energy).
- HS film is significantly more sensitive than MD-55-1 and MD-55-2 at peak absorption, but less sensitive than EDR-2 film.
Conclusions:
- Gafchromic HS film presents distinct dose and energy response characteristics.
- Its performance at low x-ray energies requires careful consideration in dosimetry applications.
- HS film offers a valuable alternative for specific radiochromic dosimetry needs.