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Tommy Knöös

Sjukhusfysiker

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

Författare

  • Börje Blad
  • Per Nilsson
  • Tommy Knöös

Summary, in English

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.

Avdelning/ar

  • Medicinsk strålningsfysik, Lund

Publiceringsår

1996

Språk

Engelska

Sidor

2541-2548

Publikation/Tidskrift/Serie

Physics in Medicine and Biology

Volym

41

Issue

11

Dokumenttyp

Artikel i tidskrift

Förlag

IOP Publishing

Ämne

  • Radiology, Nuclear Medicine and Medical Imaging

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1361-6560