Experimental determination of beam quality factors, kQ, for two types of Farmer chamber in a 10 MV photon and a 175 MeV proton beam

Physics in Medicine and Biology
J MedinJan-Erik Grindborg

Abstract

Absorbed doses determined with a sealed water calorimeter operated at 4 degrees C are compared with the results obtained using ionization chambers and the IAEA TRS-398 code of practice in a 10 MV photon beam (TPR(20,10) = 0.734) and a 175 MeV proton beam (at a depth corresponding to the residual range, R(res) = 14.7 cm). Three NE 2571 and two FC65-G ionization chambers were calibrated in terms of absorbed-dose-to-water in (60)Co at the Swedish secondary standard dosimetry laboratory, directly traceable to the BIPM. In the photon beam quality, calorimetry was found to agree with ionometry within 0.3%, confirming the k(Q) values tabulated in TRS-398. In contrast, a 1.8% deviation was found in the proton beam at 6 g cm(-2) depth, suggesting that the TRS-398 tabulated k(Q) values for these two ionization chamber types are too high. Assuming no perturbation effect in the proton beam for the ionization chambers, a value for (w(air)/e)(Q) of 33.6 J C(-1) +/- 1.7% (k = 1) can be derived from these measurements. An analytical evaluation of the effect from non-elastic nuclear interactions in the ionization chamber wall indicates a perturbation effect of 0.6%. Including this estimated result in the proton beam would increase the determine...Continue Reading

References

Apr 1, 1992·Physics in Medicine and Biology·R J SchulzN Venkataramanan
Sep 1, 1987·Medical Physics·R J SchulzM S Weinhous
Oct 1, 1985·Physics in Medicine and Biology·R J Schulz, M S Weinhous
Sep 1, 1984·Medical Physics·C K RossG D Smith
Mar 1, 1980·Medical Physics·S R Domen
Aug 1, 1995·Physics in Medicine and Biology·J V SiebersM F Moyers
Jan 1, 1996·Physics in Medicine and Biology·C K Ross, N V Klassen
Jan 1, 1996·Medical Physics·S M VatnitskyD W Miller
Feb 1, 1997·International Journal of Radiation Oncology, Biology, Physics·S DelacroixJ L Habrand
Mar 4, 1998·Physics in Medicine and Biology·H Palmans, F Verhaegen
Aug 31, 1999·The Veterinary Record·W L LoeffenF G van Zijderveld
Dec 1, 2000·Physics in Medicine and Biology·J MedinS Vynckier
Sep 28, 2004·Physics in Medicine and Biology·Hugo PalmansFrank Verhaegen
Oct 9, 2004·Physics in Medicine and Biology·J MedinJ P Seuntjens
Jul 13, 2006·The Journal of Physical Chemistry. a·Jintana Meesungnoen, Jean-Paul Jay-Gerin
Jan 1, 2002·Journal of Research of the National Institute of Standards and Technology·Norman V Klassen, Carl K Ross
Jan 1, 1997·Journal of Research of the National Institute of Standards and Technology·Norman V Klassen, Carl K Ross

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Citations

Sep 21, 2011·Medical Physics·B R MuirD W O Rogers
Nov 14, 2018·Medical Physics·Simona Giordanengo, Hugo Palmans
Oct 19, 2010·Physics in Medicine and Biology·Christian P KargerTatsuaki Kanai
Oct 19, 2019·Physics in Medicine and Biology·J RenaudJ Seuntjens
Jan 22, 2020·Physics in Medicine and Biology·Kilian-Simon BaumannKlemens Zink
Aug 19, 2016·Physics in Medicine and Biology·Hugo Palmans, Stanislav M Vatnitsky
Aug 16, 2019·Physics in Medicine and Biology·Carles Gomà, Edmond Sterpin
Aug 19, 2016·Physics in Medicine and Biology·Carles GomàSairos Safai
Mar 31, 2015·Physics in Medicine and Biology·Carles GomàSándor Vörös
Aug 12, 2014·Physics in Medicine and Biology·C GomàS Safai
Jul 17, 2020·Physics in Medicine and Biology·Kim Marina HolmSteffen Greilich
Oct 1, 2020·Physics in Medicine and Biology·Ianik Plante
Jun 22, 2021·Physics in Medicine and Biology·Kim Marina HolmAchim Krauss
Aug 12, 2021·Physics in Medicine and Biology·Kilian-Simon BaumannKlemens Zink

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