Bild: ORTEC
HPGe gamma detector
P-type coaxial and semi-planar HPGe detectors with crystal geometries selected to suit sample shape and measurement geometry.
Download product sheet (PDF)All values with references – for tender documents
Specifications checked against the manufacturer’s documents on 2026-10-16
The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.
| Detector type | P-type HPGe; coaxial or semi-planar1 |
|---|---|
| Crystal geometry | M/C: coaxial; S/SP: semi-planar2 |
| Sample geometry | S/SP for close-geometry samples; M/C for samples in front of the detector, including Marinelli beakers2 |
| Relative efficiency | Model-dependent: nominal 7–175% (GEM-M, -S, -SP); minimum 10–175% (GEM-C)2 |
|---|---|
| Resolution measurement conditions | Total system resolution measured at the factory per ANSI/IEEE Std 325-1996, at optimal shaping time with an ORTEC DSPEC-50A; guaranteed resolution may degrade with electromechanical or hybrid coolers2 |
| Cooling | LN₂ or compatible mechanical configuration, model-dependent1 |
|---|
| Crystal dimensions | Specified and warranted per model1 |
|---|
| Cryostat configurations | PopTop or Streamline1 |
|---|---|
| Bias control | Optional SMART-11 |
| Cooling and accessories | Cryostat and dewar or other cooling device required for operation and not included with the detector; a cryostat must be ordered with a Streamline detector2 |
| Model series | GEM-M, GEM-C, GEM-S and GEM-SP2 |
|---|---|
| Entrance contact | Stable thin front contact on S, SP and C1 |
The data comes from the manufacturer’s published documents. Manufacturers may change specifications; the current configuration and performance are confirmed in the quotation.
34 models in the series. Filter or scroll the table to compare.
| Model | Detector type | Crystal diameter2 | Crystal length2 | Relative efficiency2 | Energy resolution at 122 keV2 | Energy resolution at 1.33 MeV2 | Energy resolution at 5.9 keV2 | Peak-to-Compton ratio2 | Endcap diameter2 | Ordering configurations2 |
|---|---|---|---|---|---|---|---|---|---|---|
| GEM-C10 | P-type coaxial HPGe, PROFILE C2 | 50 mm ±2 mm | 25 mm (minimum) | 10 % (minimum) | ≤ 0.80 keV FWHM | ≤ 1.8 keV FWHM | ≤ 0.60 keV FWHM; with carbon-fibre window | ≥ 41:1 | 70 mm (nominal) | GEM-C10P4 (PopTop) / GEM-C10 (Streamline) |
| GEM-C15 | P-type coaxial HPGe, PROFILE C2 | 50 mm ±2 mm | 44 mm (minimum) | 15 % (minimum) | ≤ 0.82 keV FWHM | ≤ 1.8 keV FWHM | ≤ 0.64 keV FWHM; with carbon-fibre window | ≥ 46:1 | 70 mm (nominal) | GEM-C15P4 (PopTop) / GEM-C15 (Streamline) |
| GEM-C20 | P-type coaxial HPGe, PROFILE C2 | 50 mm ±2 mm | 60 mm (minimum) | 20 % (minimum) | ≤ 0.82 keV FWHM | ≤ 1.8 keV FWHM | ≤ 0.65 keV FWHM; with carbon-fibre window | ≥ 52:1 | 70 mm (nominal) | GEM-C20P4 (PopTop) / GEM-C20 (Streamline) |
| GEM-C25 | P-type coaxial HPGe, PROFILE C2 | 57 mm ±2 mm | 50 mm (minimum) | 25 % (minimum) | ≤ 0.85 keV FWHM | ≤ 1.8 keV FWHM | ≤ 0.69 keV FWHM; with carbon-fibre window | ≥ 56:1 | 70 mm (nominal) | GEM-C25P4 (PopTop) / GEM-C25 (Streamline) |
| GEM-C30 | P-type coaxial HPGe, PROFILE C2 | 57 mm ±2 mm | 62 mm (minimum) | 30 % (minimum) | ≤ 0.85 keV FWHM | ≤ 1.8 keV FWHM | ≤ 0.72 keV FWHM; with carbon-fibre window | ≥ 60:1 | 70 mm (nominal) | GEM-C30P4 (PopTop) / GEM-C30 (Streamline) |
| GEM-C40 | P-type coaxial HPGe, PROFILE C2 | 64 mm ±2 mm | 58 mm (minimum) | 40 % (minimum) | ≤ 0.87 keV FWHM | ≤ 1.8 keV FWHM | ≤ 0.76 keV FWHM; with carbon-fibre window | ≥ 64:1 | 76 mm (nominal) | GEM-C40P4 (PopTop) / GEM-C40 (Streamline) |
| GEM-C50 | P-type coaxial HPGe, PROFILE C2 | 68 mm ±2 mm | 62 mm (minimum) | 50 % (minimum) | ≤ 0.90 keV FWHM | ≤ 1.9 keV FWHM | ≤ 0.80 keV FWHM; with carbon-fibre window | ≥ 66:1 | 83 mm (nominal) | GEM-C50P4 (PopTop) / GEM-C50 (Streamline) |
| GEM-C60 | P-type coaxial HPGe, PROFILE C2 | 68 mm ±2 mm | 77 mm (minimum) | 60 % (minimum) | ≤ 1.00 keV FWHM | ≤ 1.9 keV FWHM | – | ≥ 70:1 | 83 mm (nominal) | GEM-C60P4 (PopTop) / GEM-C60 (Streamline) |
| GEM-C70 | P-type coaxial HPGe, PROFILE C2 | 70 mm ±2 mm | 85 mm (minimum) | 70 % (minimum) | ≤ 1.00 keV FWHM | ≤ 2.0 keV FWHM | ≤ 0.90 keV FWHM; with carbon-fibre window | ≥ 75:1 | 83 mm (nominal) | GEM-C70P4 (PopTop) / GEM-C70 (Streamline) |
| GEM-C80 | P-type coaxial HPGe, PROFILE C2 | 80 mm ±2 mm | 61 mm (minimum) | 80 % (minimum) | ≤ 1.00 keV FWHM | ≤ 2.0 keV FWHM | ≤ 0.95 keV FWHM; with carbon-fibre window | ≥ 73:1 | 95 mm (nominal) | GEM-C80P4 (PopTop) / GEM-C80 (Streamline) |
| GEM-C90 | P-type coaxial HPGe, PROFILE C2 | 80 mm ±2 mm | 70 mm (minimum) | 90 % (minimum) | ≤ 1.10 keV FWHM | ≤ 2.0 keV FWHM | ≤ 0.95 keV FWHM; with carbon-fibre window | ≥ 80:1 | 95 mm (nominal) | GEM-C90P4 (PopTop) / GEM-C90 (Streamline) |
| GEM-C100 | P-type coaxial HPGe, PROFILE C2 | 80 mm ±2 mm | 82 mm (minimum) | 100 % (minimum) | ≤ 1.10 keV FWHM | ≤ 2.1 keV FWHM | ≤ 1.00 keV FWHM; with carbon-fibre window | ≥ 83:1 | 95 mm (nominal) | GEM-C100P4 (PopTop) / GEM-C100 (Streamline) |
| GEM-C110 | P-type coaxial HPGe, PROFILE C2 | 80 mm ±2 mm | 91 mm (minimum) | 110 % (minimum) | ≤ 1.10 keV FWHM | ≤ 2.1 keV FWHM | ≤ 1.05 keV FWHM; with carbon-fibre window | ≥ 85:1 | 95 mm (nominal) | GEM-C110P4 (PopTop) / GEM-C110 (Streamline) |
| GEM-C120 | P-type coaxial HPGe, PROFILE C2 | 82 mm ±2 mm | 98 mm (minimum) | 120 % (minimum) | ≤ 1.10 keV FWHM | ≤ 2.1 keV FWHM | ≤ 1.05 keV FWHM; with carbon-fibre window | ≥ 86:1 | 95 mm (nominal) | GEM-C120P4 (PopTop) / GEM-C120 (Streamline) |
| GEM-C130 | P-type coaxial HPGe, PROFILE C2 | 92 mm ±2 mm | 67 mm (minimum) | 130 % (minimum) | ≤ 1.20 keV FWHM | ≤ 2.1 keV FWHM | ≤ 1.10 keV FWHM; with carbon-fibre window | ≥ 83:1 | 108 mm (nominal) | GEM-C130P4 (PopTop) / GEM-C130 (Streamline) |
| GEM-C140 | P-type coaxial HPGe, PROFILE C2 | 92 mm ±2 mm | 74 mm (minimum) | 140 % (minimum) | ≤ 1.20 keV FWHM | ≤ 2.2 keV FWHM | ≤ 1.10 keV FWHM; with carbon-fibre window | ≥ 83:1 | 108 mm (nominal) | GEM-C140P4 (PopTop) / GEM-C140 (Streamline) |
| GEM-C150 | P-type coaxial HPGe, PROFILE C2 | 92 mm ±2 mm | 81 mm (minimum) | 150 % (minimum) | ≤ 1.30 keV FWHM | ≤ 2.3 keV FWHM | ≤ 1.10 keV FWHM; with carbon-fibre window | ≥ 90:1 | 108 mm (nominal) | GEM-C150P4 (PopTop) / GEM-C150 (Streamline) |
| GEM-C175 | P-type coaxial HPGe, PROFILE C2 | 94 mm ±2 mm | 100 mm (minimum) | 175 % (minimum) | ≤ 1.30 keV FWHM | ≤ 2.3 keV FWHM | ≤ 1.10 keV FWHM; with carbon-fibre window | ≥ 90:1 | 108 mm (nominal) | GEM-C175P4 (PopTop) / GEM-C175 (Streamline) |
| GEM-M5060 | P-type coaxial HPGe, PROFILE M1 | 50 mm ±2 mm | 60 mm (minimum) | 20 % (nominal) | ≤ 0.88 keV FWHM | ≤ 1.8 keV FWHM | – | ≥ 60:1 | 70 mm (nominal) | GEM-M5060P4 (PopTop) / GEM-M5060 (Streamline) |
| GEM-M5970 | P-type coaxial HPGe, PROFILE M1 | 59 mm ±2 mm | 70 mm (minimum) | 38 % (nominal) | ≤ 0.90 keV FWHM | ≤ 1.8 keV FWHM | – | ≥ 62:1 | 70 mm (nominal) | GEM-M5970P4 (PopTop) / GEM-M5970 (Streamline) |
| GEM-M7080 | P-type coaxial HPGe, PROFILE M1 | 70 mm ±2 mm | 80 mm (minimum) | 66 % (nominal) | ≤ 0.95 keV FWHM | ≤ 1.9 keV FWHM | – | ≥ 75:1 | 83 mm (nominal) | GEM-M7080P4 (PopTop) / GEM-M7080 (Streamline) |
| GEM-M8295 | P-type coaxial HPGe, PROFILE M1 | 82 mm ±2 mm | 95 mm (minimum) | 115 % (nominal) | ≤ 1.30 keV FWHM | ≤ 2.1 keV FWHM | – | ≥ 85:1 | 95 mm (nominal) | GEM-M8295P4 (PopTop) / GEM-M8295 (Streamline) |
| GEM-M94100 | P-type coaxial HPGe, PROFILE M1 | 94 mm ±2 mm | 100 mm (minimum) | 175 % (nominal) | ≤ 1.30 keV FWHM | ≤ 2.3 keV FWHM | – | ≥ 90:1 | 108 mm (nominal) | GEM-M94100P4 (PopTop) / GEM-M94100 (Streamline) |
| GEM-S5020 | P-type semi-planar HPGe, PROFILE S1 | 50 mm ±2 mm | 20 mm (minimum) | 7 % (nominal) | ≤ 0.65 keV FWHM | ≤ 1.8 keV FWHM | ≤ 0.40 keV FWHM; with carbon-fibre window | ≥ 35:1 | 70 mm (nominal) | GEM-S5020P4 (PopTop) / GEM-S5020 (Streamline) |
| GEM-S5825 | P-type semi-planar HPGe, PROFILE S1 | 58 mm ±2 mm | 25 mm (minimum) | 15 % (nominal) | ≤ 0.65 keV FWHM | ≤ 1.8 keV FWHM | ≤ 0.43 keV FWHM; with carbon-fibre window | ≥ 35:1 | 70 mm (nominal) | GEM-S5825P4 (PopTop) / GEM-S5825 (Streamline) |
| GEM-S7025 | P-type semi-planar HPGe, PROFILE S1 | 70 mm ±2 mm | 25 mm (minimum) | 20 % (nominal) | ≤ 0.65 keV FWHM | ≤ 1.9 keV FWHM | ≤ 0.45 keV FWHM; with carbon-fibre window | ≥ 40:1 | 83 mm (nominal) | GEM-S7025P4 (PopTop) / GEM-S7025 (Streamline) |
| GEM-S7030 | P-type semi-planar HPGe, PROFILE S1 | 70 mm ±2 mm | 30 mm (minimum) | 28 % (nominal) | ≤ 0.70 keV FWHM | ≤ 1.9 keV FWHM | ≤ 0.45 keV FWHM; with carbon-fibre window | ≥ 40:1 | 83 mm (nominal) | GEM-S7030P4 (PopTop) / GEM-S7030 (Streamline) |
| GEM-S8530 | P-type semi-planar HPGe, PROFILE S1 | 85 mm ±2 mm | 30 mm (minimum) | 50 % (nominal) | ≤ 0.70 keV FWHM | ≤ 1.9 keV FWHM | ≤ 0.50 keV FWHM; with carbon-fibre window | ≥ 55:1 | 108 mm (nominal) | GEM-S8530P4 (PopTop) / GEM-S8530 (Streamline) |
| GEM-S9430 | P-type semi-planar HPGe, PROFILE S1 | 94 mm ±2 mm | 30 mm (minimum) | 65 % (nominal) | ≤ 0.70 keV FWHM | ≤ 1.9 keV FWHM | ≤ 0.50 keV FWHM; with carbon-fibre window | ≥ 65:1 | 108 mm (nominal) | GEM-S9430P4 (PopTop) / GEM-S9430 (Streamline) |
| GEM-SP5020 | P-type semi-planar HPGe, PROFILE SP1 | 50 mm ±2 mm | 20 mm (minimum) | 7 % (nominal) | ≤ 0.59 keV FWHM | ≤ 1.8 keV FWHM | ≤ 0.30 keV FWHM; with carbon-fibre window | ≥ 35:1 | 70 mm (nominal) | GEM-SP5020P4 (PopTop) / GEM-SP5020 (Streamline) |
| GEM-SP5825 | P-type semi-planar HPGe, PROFILE SP1 | 58 mm ±2 mm | 25 mm (minimum) | 15 % (nominal) | ≤ 0.59 keV FWHM | ≤ 1.8 keV FWHM | ≤ 0.34 keV FWHM; with carbon-fibre window | ≥ 35:1 | 70 mm (nominal) | GEM-SP5825P4 (PopTop) / GEM-SP5825 (Streamline) |
| GEM-SP7025 | P-type semi-planar HPGe, PROFILE SP1 | 70 mm ±2 mm | 25 mm (minimum) | 20 % (nominal) | ≤ 0.59 keV FWHM | ≤ 1.8 keV FWHM | ≤ 0.38 keV FWHM; with carbon-fibre window | ≥ 40:1 | 83 mm (nominal) | GEM-SP7025P4 (PopTop) / GEM-SP7025 (Streamline) |
| GEM-SP8530 | P-type semi-planar HPGe, PROFILE SP1 | 85 mm ±2 mm | 30 mm (minimum) | 50 % (nominal) | ≤ 0.63 keV FWHM | ≤ 1.9 keV FWHM | ≤ 0.40 keV FWHM; with carbon-fibre window | ≥ 55:1 | 108 mm (nominal) | GEM-SP8530P4 (PopTop) / GEM-SP8530 (Streamline) |
| GEM-SP9430 | P-type semi-planar HPGe, PROFILE SP1 | 94 mm ±2 mm | 30 mm (minimum) | 65 % (nominal) | ≤ 0.63 keV FWHM | ≤ 1.9 keV FWHM | ≤ 0.43 keV FWHM; with carbon-fibre window | ≥ 65:1 | 108 mm (nominal) | GEM-SP9430P4 (PopTop) / GEM-SP9430 (Streamline) |
The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.
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ORTEC (AMETEK)