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Technical Note: Response measurement for select radiation detectors in magnetic fields
M Reynolds1, B G Fallone2, S Rathee3
1Department of Oncology, Medical Physics Division, University of Alberta, 11560 University Avenue, Edmonton, Alberta T6G 1Z2, Canada.
Medical Physics
|July 2, 2015
Summary
Longitudinal magnetic fields show minimal impact on radiation detector response up to 0.21 T. This finding validates previous simulation data for linear accelerator-magnetic resonance devices.
Area of Science:
- Medical Physics
- Radiation Detection
- Electromagnetism
Background:
- Linear accelerator-magnetic resonance (LINAC-MR) devices require understanding detector behavior in magnetic fields.
- Previous studies simulated the dose response of radiation detectors to magnetic fields.
Purpose of the Study:
- To experimentally verify simulation data on radiation detector response in longitudinal magnetic fields.
- To investigate the dose response of specific detectors (ion chamber, diamond detector, diode detector) under longitudinal magnetic field conditions.
Main Methods:
- Measured the dose response of PR06C ion chamber, PTW60003 diamond detector, and IBA PFD diode detector.
- Applied longitudinal magnetic fields parallel to the radiation beam.
- Reported dose response as the ratio of detector signals with and without the magnetic field.
Main Results:
- No discernible dose response was observed for any detector up to 0.21 T in longitudinal magnetic fields.
- Experimental results align with previous simulation-only findings.
- Confirmed minimal magnetic field effects on detector signal.
Conclusions:
- Low-field longitudinal magnetic fields have negligible effects on the dose response of the investigated radiation detectors.
- Experimental data supports the validity of prior simulation studies for LINAC-MR applications.
- The findings enhance confidence in detector performance within combined magnetic and radiation environments.
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