PMID: 11318309Apr 25, 2001Paper

Determination of percentage depth-dose curves for electron beams using different types of detectors

Medical Physics
G X Ding, C W Yu

Abstract

According to the new AAPM TG-51 dosimetry protocol, reference dosimetry for electron beams is performed at depth of d(ref)=0.6R50-0.1 (cm) instead of d(max) recommended in TG-21. In clinical practice most electron beams are normalized at d(max). Therefore it becomes more important to get an accurate percentage-depth-dose (%dd) curve particularly for higher-energy electron beams in which the depth d(ref) is away from d(max). When ionization chambers are used in determining %dd curves the water-to-air stopping-power ratios and the fluence correction factors are required. The TG-51 recommends that the stopping-power ratios for realistic electron beams be used instead of the monoenergetic stopping-power ratios used in TG-21. This investigation aims to study the effects of those correction factors on the determination of %dd curves. We observed 1% deviations in the value of %dd at d(ref) for 15 and 18 MeV beams between a plane-parallel NACP and a cylindrical IC-10 chamber without considering the fluence correction factors P(fl). We explored a method to derive the fluence correction factors at any depth by using the existing fluence correction data at d(max) and tested its feasibility. We compared %dd curves measured by a diode detec...Continue Reading

References

Apr 21, 1998·Medical Physics·D W Rogers

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Citations

Jun 9, 2007·Medical Physics·Lilie L W Wang, David W O Rogers
Jul 21, 2009·Medical Physics·Paul A Jursinic
Mar 9, 2017·Medical Physics·Mehran YarahmadiOtto A Sauer
Aug 1, 2007·Physics in Medicine and Biology·James C L Chow, Grigor N Grigorov
Jun 15, 2006·Radiation Protection Dosimetry·Haijun SongRavinder Nath
Sep 25, 2021·Journal of Radiation Research·Yuichi AkinoKazuhiko Ogawa

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