The Tohoku Journal of Experimental Medicine
Online ISSN : 1349-3329
Print ISSN : 0040-8727
ISSN-L : 0040-8727
Regular Contributions
Stability of Electron-Beam Energy Monitor for Quality Assurance of the Electron-Beam Energy from Radiotherapy Accelerators
KOICHI CHIDAHARUO SAITOYOSHIHIRO TAKAIMASAYUKI ZUGUCHIMASATOSHI MITSUYAHIDEHARU SAKAKIDAMASAHIRO KOHZUKISHOGO YAMADA
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2002 Volume 198 Issue 3 Pages 197-201

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Abstract

Information on electron energy is important in planning radiation therapy using electrons. The Geske 3405 electron beam energy monitor (Geske monitor, PTW Nuclear Associates, Carle Place, NY, USA) is a device containing nine ionization chambers for checking the energy of the electron beams produced by radiotherapy accelerators. We wondered whether this might increase the likelihood of ionization chamber trouble. In spite of the importance of the stability of such a quality assurance (QA) device, there are no reports on the stability of values measured with a Geske monitor. The purpose of this paper was therefore to describe the stability of a Geske monitor. It was found that the largest coefficient of variation (CV) of the Geske monitor measurements was approximately 0.96% over a 21-week period. In conclusion, the stability of Geske monitor measurements of the energy of electron beams from a linear accelerator was excellent.

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© 2002 Tohoku University Medical Press
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