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Photon Detector Categories Well Detectors (GWL Series)
Well detector design maximizes efficiency for small samples. The
Well detector is actually a p-type Germanium (HPGe) coaxial detector mounted with a
large central hole facing the front of the endcap.
 Historically, Well detectors have been characterized by the following
parameters:
- Active volume (cc)
- Diameter (mm) of endcap well
- Depth (mm) of endcap well
- Energy resolution at 1.33 MeV (keV FWHM)
- Energy resolution at 122 keV (keV FWHM)
Efficiency of Well DetectorsData on efficiency of Well detectors can be found in the literature (Ref. 10). Figure 20 shows a typical efficiency curve for
point sources placed at the bottom of the Well.
The ORTEC Well Detector AdvantageThe "blind well" approach pioneered by ORTEC puts sensitive
germanium immediately under the sample, and thus increases the detector efficiency,
particularly for low-energy lines. |
