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Temperature dependence of commercially available diode detectors
Amarjit S Saini1, Timothy C Zhu
1Department of Radiation Oncology, H. Lee Moffitt Cancer Center & Research Institute, University of South Florida, Tampa 33612, USA.
Medical Physics
|May 7, 2002
Summary
The temperature coefficient of diode radiation detectors is dose rate independent for preirradiated diodes, but varies for unirradiated diodes. Sufficient preirradiation ensures dose rate independence of the temperature coefficient.
Area of Science:
- Medical Physics
- Radiation Detection
Background:
- Diode detectors are crucial for radiation dosimetry.
- Understanding their temperature dependence is vital for accurate measurements.
- Dose rate effects can influence detector performance.
Purpose of the Study:
- To investigate the temperature dependence of n- and p-type diode detectors.
- To evaluate the impact of different radiation dose rates (pulsed vs. continuous) on temperature sensitivity.
- To determine if preirradiation affects the dose rate dependence of the temperature coefficient.
Main Methods:
- Experimental measurements of diode sensitivity versus temperature.
- Testing under high instantaneous (pulsed) and low (continuous) dose rates.
- Measurements conducted in a water phantom at various distances and depths.
- Temperature range: 10°C to 35°C.
Main Results:
- Diode response was linear across all detectors.
- Temperature coefficient was dose rate independent for preirradiated diodes (e.g., QED p-type: (0.30 ± 0.01)%/°C).
- Unirradiated diodes showed dose rate dependent temperature coefficients, varying between individual units.
Conclusions:
- Sufficient preirradiation eliminates dose rate dependence of the temperature coefficient in diodes.
- Preirradiation does not eliminate dose rate dependence of diode sensitivity itself.
- Careful consideration of preirradiation is necessary for accurate diode dosimetry across varying dose rates.