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PTW-diamond detector: dose rate and particle type dependence
A Fidanzio1, L Azario, R Miceli
1Instituto di Fisica, Università Cattolica del S. Cuore, Roma, Italy. andfida@tin.it
Medical Physics
|December 29, 2000
Summary
PTW natural diamond detectors (DD) offer superior stability for photon and electron beam dosimetry compared to silicon detectors (SFD). Diamond detectors show minimal sensitivity change with dose per pulse, enabling accurate relative and reference dosimetry in radiotherapy.
Area of Science:
- Medical Physics
- Radiation Dosimetry
Background:
- Accurate dose measurement is crucial for effective radiotherapy.
- Solid-state detectors are widely used but can exhibit dose per pulse dependence.
- Comparing detector performance is essential for optimizing clinical dosimetry.
Purpose of the Study:
- To evaluate the suitability of a PTW natural diamond detector (DD) for dosimetry.
- To compare the performance of DD with a stereotactic silicon detector (SFD).
- To investigate dose per pulse dependence and develop a dosimetry formalism for DD.
Main Methods:
- Relative and reference dosimetry measurements were performed using DD and SFD.
- Photon and electron beams with varying doses per pulse were utilized.
- Fitting parameters (delta) were determined to correct for detector response.
Main Results:
- DD sensitivity changed by up to 1.8%, while SFD sensitivity changed by up to 4.5% with dose per pulse.
- The fitting parameter delta was found to be independent of beam type for DD.
- DD exhibited a beam quality and particle type independent calibration factor.
Conclusions:
- PTW natural diamond detectors are highly suitable for relative and reference dosimetry.
- DD offers improved stability and accuracy over silicon detectors in the studied dose range.
- An empirical dosimetric formalism using DD is proposed for accurate reference dosimetry.