Photo-diodes for Synchrotron Applications
Single or multiple junction on ceramic board Electron Beam Detector Si Photodiodes.
Single or multiple junction on ceramic board Electron Beam Detector Si Photodiodes.
Segmented Planar Germanium EGPS Series
Detectors for X and Y Ray Measurements
EGPS series is the best choice for X or gamma ray measurements in many applications such as Physics or Astrophysics experiments as well as non invasive detection or medical application.
Features
- For high performance X and γ measurements in Physics, astrophysics, non-destructive control and medicine
- Unique proprietary segmentation techniques developed and enhanced for over 15 years
- Large range of shapes (pixels, strips) and segmentations (straight strips, circular, single or double sided)
- Excellent energy resolution (<130 eV at 5.9 keV, depending on geometries and count rate)
- Excellent performance at high count rates, with small as well as large detectors (up to 1 Mcps)
- Accurate localization of the interaction points (1, 2 or 3D)
- Thickness up to 20 mm
- Crosstalk with physical pulses 1% maximum
- Double sided segmentation capability, using Mirion thin window proprietary technology
- Available with LN2 or electrical cooling
Description
Applications
- Synchrotron (EXAFS, diffraction, medical beam lines)
- Nuclear Physics (tracking)
- Compton cameras (imaging)
- Non destructive control
- Radiography
- Medical (BNCT, Angiography)
Mirion series EGPS detectors are manufactured using a proprietary technology allowing design for the best strip germanium detectors available worldwide. Mirion uses photolithography techniques – usually employed in microelectronics – to germanium diodes. Thus, all kinds of segmentation patterns are possible (straight or curved strips, pixels, etc.) including double sided thin window segmentation. This reliable technology has been proven since the eighties.
Segmentation offers many benefits:
- Suppression of dead layers between consecutive strips.
- Thinnest pitch: down to 50 µm on single sided strips.
- Excellent performances at high count rates (up to 1 million pulses per second).
- 2-sided photolithography capability, with pitchs up to 200 µm.
- Excellent FWHM resolution: typically <130 eV at 5.9 keV.
- No measurable physical crosstalk.
The segmentation techniques fit with all crystal designs: circular, rectangular, etc. Diodes which are segmented by photolithography allow easier and more accurate 3D localization of interaction points than those obtained with segmented coaxial detectors. This is due to the electrical field characteristics within the detector. Several EGPS detectors may be associated in arrays or may be stacked in a single cryostat, thus offering smaller dead layers to increase of the angular covering (or high energy ray absorption depending on system configuration).
Various similar assemblies of that kind are used for Compton Cameras. EGPS detectors are cooled at liquid nitrogen temperature and may withstand many thermal cycles without any performance degradation. Such characteristics make Mirion EGPS series the best choice for X or gamma ray measurements in many applications such as Physics or Astrophysics experiments as well as non invasive detection or medical application.
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