PMID: 9533133Apr 9, 1998Paper

On the use of unshielded cables in ionization chamber dosimetry for total-skin electron therapy

Physics in Medicine and Biology
Z ChenRavinder Nath

Abstract

The dosimetry of total-skin electron therapy (TSET) usually requires ionization chamber measurements in a large electron beam (up to 120 cm x 200 cm). Exposing the chamber's electric cable, its connector and part of the extension cable to the large electron beam will introduce unwanted electronic signals that may lead to inaccurate dosimetry results. While the best strategy to minimize the cable-induced electronic signal is to shield the cables and its connector from the primary electrons, as has been recommended by the AAPM Task Group Report 23 on TSET, cables without additional shielding are often used in TSET dosimetry measurements for logistic reasons, for example when an automatic scanning dosimetry is used. This paper systematically investigates the consequences and the acceptability of using an unshielded cable in ionization chamber dosimetry in a large TSET electron beam. In this paper, we separate cable-induced signals into two types. The type-I signal includes all charges induced which do not change sign upon switching the chamber polarity, and type II includes all those that do. The type-I signal is easily cancelled by the polarity averaging method. The type-II cable-induced signal is independent of the depth of the ...Continue Reading

References

Jan 1, 1972·Physics in Medicine and Biology·J Van Dyk, J C Macdonald
Mar 1, 1984·Physics in Medicine and Biology·P C Williams, T J Jordan
Mar 1, 1980·Medical Physics·J J Spokas, R D Meeker
Jan 1, 1994·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·C FiorinoR Calandrino

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Citations

Oct 12, 2000·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·C FiorinoR Calandrino
Oct 19, 2010·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·S DiamantopoulosV Kouloulias
Sep 6, 2015·Australasian Physical & Engineering Sciences in Medicine·Raelene NelliganMichael Bailey

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