Segmented Planar Germanium Detectors for X and g Ray Measurements

Features

• For high performance X and g measurements in Physics, astrophysics, non destructive control and medicine
• CANBERRA proprietary techniques, available for more than 15 years
• Wide range of shapes (pixels, strips) and segmentations (straight strips, circular, single or double sided)
• Excellent energy resolution (150 eV at 5.9 keV, depending on geometries)
• Good behaviour 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
• Minimum pitch 200 µm Crosstalk 1% maximum
• Double sided segmentation capability, using CANBERRA thin window proprietary technology
• Liquid nitrogen or cryogenerator cooling.

Description

The CANBERRA EGPS detectors are manufactured using a proprietary technology allowing design of the best strip germanium detectors available worldwide.

CANBERRA has applied the photolithography techniques -usually employed in microelectronics- to germanium diodes. Thus, all kind of segmentation paterns are possible (straight or curved strips, pixels, etc.).
This technology has been proven for 15 years.

CANBERRA offers a proprietary double sided thin window segmentation.

Segmentation offers many advantages:

• Suppression of dead zones between consecutive strips
• Smallest pitch: down to 100 µm
• Good behaviour at high count rates (up to 1 million pulses per second)
• 2-sided photolithography capability, with pitchs up to 100 µm
• Excellent FWHM resolution: typically 150 eV at 5.9 keV
• No measurable crosstalk.

The segmentation techniques fit with all cristal 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, due to the electrical field characteristics inside the detector.

Several EGPS detectors may be associated in arrays or may be stacked in a unique cryostat, thus offering smaller dead zones for increase of the angular covering (or high energy ray absorbtion according to system configuration). Different assemblies of that kind are used for Compton Cameras.

EGPS detectors are cooled at the liquid nitrogen temperature and may withstand many thermal cycles.

Such characteristics make of 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.