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Technical Note: Ion chamber angular dependence in a magnetic field.

Michael Reynolds1, Satyapal Rathee1,2, B Gino Fallone2,3

  • 1Department of Oncology, Medical Physics Division, University of Alberta, 11560 University Avenue, Edmonton, Alberta, T6G 1Z2, Canada.

Medical Physics
|June 13, 2017
PubMed
Summary
This summary is machine-generated.

Investigating the PR06C ionization chamber, this study found that magnetic fields orthogonal to the radiation beam cause significant dose-response fluctuations with orientation. Parallel fields, however, maintain a homogeneous response.

Keywords:
Linac-MRMonte Carloangular dependenceion chambermagnetic fieldsetup inaccuracies

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Area of Science:

  • Medical Physics
  • Radiation Detection
  • Electromagnetism

Background:

  • Dose deposition in radiation detectors is affected by magnetic fields.
  • Detector orientation's impact on dose-response in magnetic fields is understudied.

Purpose of the Study:

  • To investigate the angular dose-response of a PR06C ionization chamber in varying magnetic fields.
  • To benchmark the PENELOPE Monte Carlo code with a magnetic field Fano test.

Main Methods:

  • Simulated a PR06C ionization chamber using PENELOPE Monte Carlo.
  • Applied magnetic fields (0.35 T–1.5 T) parallel and orthogonal to a 6 MV photon beam.
  • Scored dose-response across various polar and azimuthal angles, normalizing to zero-field conditions.

Main Results:

  • The Fano test showed a 0.4% difference, validating the simulation.
  • Orthogonal magnetic fields caused varied dose-response (0.89–1.08), with 3° deviations altering response by >1%.
  • Parallel magnetic fields resulted in a homogeneous dose-response (<1% variation below 1.0 T).

Conclusions:

  • Ionization chamber dose-response is highly sensitive to angular orientation in orthogonal magnetic fields.
  • Parallel magnetic fields provide a more stable and homogeneous dose-response, irrespective of orientation.