Applications
QED diode detectors should be used in situations where the beam is normal
or close to normal to the patient skin surface.
Energy Ranges
– choosing the right QED™
QED detectors are offered in three photon energy ranges, a single electron
energy range, and a skin detector.
| a) P/N 1114000-2 | 1-4 MV |
|
| b) P/N 1115000-2 | 6-12 MV | |
| c) P/N 1116000-2 | 15-25 MV | |
| d) P/N 1112000-2 | electron energies | |
| e) P/N 1113000-2 | Skin (no buildup) | |
Accuracy
The QED offers exceptional accuracy for a flat diode detector.
When tested on top of 6 cm of virtual water, variation in
directional response is +/- 0.5% for 30°, and +/- 1.0% for 45° for 6MV
beams.
View angular dependence for 6 MV
Lifetime
As with any diode, as the QED’s are repeatedly used their sensitivity will
change. This rate of change will depend on the energies used and the
frequency of use. Once it is deemed necessary, the diode can be
re-calibrated and is once again ready for use. It is important to know that
QED life-expectancy is not limited by radiation exposure – the more it is
used the less it’s response characteristics will change. Long term use and
accuracy is more an issue of proper handling and care. Broken Co-Ax
connectors and cables are the most common cause of failure.
Construction
QED construction varies according to the build-up material used.
Features
Flat design allows for easy and reliable placement on patient skin surface
Advanced p-type die design is accurate and responsive
Compatibility with any diode based dosimetry system
Long lifetime if handled properly
Intelligent pricing