Does the photon beam quality factor depend on the type of ionization chamber?
basic_science · Level V
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- Record sourced from PubMed, PMID 7501813.
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Abstract
The photon beam quality factor Q of 6- and 15-MV photon beams has been measured using different types of thimble ionization chambers with various wall, electrode and insulator materials. Some types of chambers seem to overestimate the corresponding Q-value by 0.4% (6 MV) and 0.7% (15 MV), respectively. The effect on the stopping power ratio water to air and on the pertubation correction will be discussed.
Medical subject headings
- Photons
- Radiometry