GWL (Well) P-type Reverse Coaxial HPGe Detector

• Well-type HPGe detector with near 4π counting geometry for maximum efficiency
• Ultra-high absolute counting efficiency for small sample analysis
• Wide energy range from ~10 keV to 10 MeV
• A unique ion-implanted “blind well” design improves detection performance
• An ultra-thin dead layer (~0.3 µm) enhances low-energy sensitivity
• Large well size accommodates various sample types (1.55 cm × 4.0 cm)
• High sensitivity for low-level radioactivity measurements
• Optional low-background configurations for ultra-sensitive applications

The GWL (Well) P-type Reverse Coaxial HPGe detector is a specialized high-efficiency gamma spectroscopy detector designed for low-level counting of small samples.

What makes the GWL series unique is its well-type geometry, where the sample is placed directly inside the detector's cavity. This creates a near 4π geometry, delivering the highest possible absolute counting efficiency compared to standard coaxial detectors.

Unlike conventional well detectors, the GWL features a “blind hole” design, meaning the well does not pass completely through the crystal. Instead, it retains active germanium at the bottom of the well, significantly improving detection efficiency and spectral performance.

With an ultra-thin dead layer (~0.3 µm), the detector achieves excellent sensitivity across a wide energy range, from low-energy gamma rays (~10 keV) up to high-energy gamma radiation (10 MeV).

The GWL detector is the ideal solution for laboratories requiring maximum efficiency, high sensitivity, and precise measurement of low-activity samples, particularly in controlled measurement geometries.

Detector Type: P-type High Purity Germanium (HPGe), Reverse Coaxial (Well)
Geometry: Well-type (sample placed inside detector)
Energy Range: ~10 keV to 10 MeV
Dead Layer Thickness: ~0.3 µm (ultra-thin)
Well Dimensions: ~1.55 cm diameter × 4.0 cm depth
Active Volume: Up to ~400 cc
Efficiency: Extremely high (near 4π geometry)
Design Feature: Ion-implanted blind well
Low Background Options:

• OFHC copper endcap
• High-purity aluminum well tube

Preamplifier Options: Remote preamplifier for low-background setups
Cooling Options: Liquid Nitrogen (LN2)

• Low-level gamma spectroscopy
• Environmental radioactivity analysis (small samples)
• Radiochemical analysis
• Nuclear research and isotope identification
• Bioassay and trace-level measurements
• Sample-in-well measurements (highest efficiency geometry)
• Quality control of radioactive materials