PMID: 8938044Nov 1, 1996Paper

The influence of air humidity on an unsealed ionization chamber in a linear accelerator

Physics in Medicine and Biology
B BladT Knöös

Abstract

The safe and accurate delivery of the prescribed absorbed dose is the central function of the dose monitoring and beam stabilization system in a medical linear accelerator. The absorbed dose delivered to the patient during radiotherapy is often monitored by a transmission ionization chamber. Therefore it is of utmost importance that the chamber behaves correctly. We have noticed that the sensitivity of an unsealed chamber in a Philips SL linear accelerator changes significantly, especially during and after the summer season. The reason for this is probably a corrosion effect of the conductive plates in the chamber due to the increased relative humidity during hot periods. We have found that the responses of the different ion chamber plates change with variations in air humidity and that they do not return to their original values when the air humidity is returned to ambient conditions.

References

May 1, 1987·Physics in Medicine and Biology·T M Kehoe, D Barnard
May 1, 1985·Medical Physics·H R Boese, D V Cormack
Jul 1, 1971·Physics in Medicine and Biology·G P Naylor, P C Williams
Nov 1, 1969·The British Journal of Radiology·W H Sutherland
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Nov 1, 1984·Medical Physics·C Constantinou, E S Sternick

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Citations

Jul 15, 2015·Zeitschrift für medizinische Physik·Majid Ghorbanpour BesheliWilfried Budach
Sep 2, 1998·Physics in Medicine and Biology·M Boutillon

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