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Small Anode Germanium Well Detectors

The Mirion SAGe™ Well Detector combines excellent energy resolution at low and high energies with maximum efficiency for small samples.

Tag Features

  • Blind well approaches 4 π counting geometry yielding high absolute efficiency
  • Superior resolution compared to Traditional Well Detectors at both low and high energies
  • Larger well diameter (28 mm) available with the same excellent resolution as the standard (16 mm) well sizes
  • Thin lithium diffused contact inside well allows spectroscopy from 20 keV up to 10 MeV
  • Full LabSOCS™ characterization available, allowing True Coincidence Summing correction
  • Equipped with Intelligent Preamplifier
  • USB 2.0 Serial Interface


The Mirion SAGe™ Well Detector1 combines excellent energy resolution at low and high energies with maximum efficiency for small samples. Like Traditional Well Detectors, the SAGe Well is fabricated with a blind hole, leaving at least 20 mm of active detector thickness at the bottom of the well. The counting geometry therefore approaches 4 π.

The low detector capacitance associated with the small anode technology (similar to what is used on the Mirion BEGe™ detectors) gives the SAGe Well superior low and medium-energy resolution performance compared to Traditional Well or Coaxial Detectors, as well as excellent resolution for higher energy gamma rays.

Furthermore, the detector is manufactured with an aspect ratio of a coaxial detector to allow excellent efficiency performance for standard laboratory geometries such as Marinelli beakers or other large sample containers. The result is a versatile detector that can deliver reductions in count time, through improvements in Minimum Detectable Concentration /Activity (MDC /MDA), for a range of sample sizes and geometries counted inside the well, on the end cap or in Marinelli beakers.

The thin lithium (approximately 50 μm) diffused contact inside the well, combined with a thin-walled aluminum insert in the detector end cap (0.5 mm on the sides and a 1 mm thick bottom) provide a good low-energy response, allowing spectroscopy down to 20 keV. The contact on the outer surface of the detector is approximately 0.5 mm thick, similar to what is used on SEGe™ Standard Electrode Germanium coaxial detectors. Therefore, the useful energy range for sources outside of the well is limited to 40 keV and up.

1US Patent 9,269,847 B2


  • Environmental samples 
  • Radiobioassay 
  • Geology 
  • Oceanography



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