HPGe Radiation Detector Types and How to Choose

HPGe and SiLi Radiation Detector Energy RangeCategories of High Purity Germanium (HPGe) Radiation Detectors

ORTEC offers a wide range of HPGe radiation detector solutions which cover energies for X-rays in the few hundred electron volts (eV) range up to gamma rays in the 10 MeV and above range. These detectors are manufactured using high purity germanium (HPGe) of both P- and N-type. All detectors in these two classes are cryogenically cooled, using either liquid nitrogen or electro-mechanical coolers.

How to Choose the Right HPGe Radiation Detector for Your Application

Choosing the correct detector for your specific application involves many criteria. No single table or graph can uniquely specify a detector for a particular measurement. The energy range chart above, and the key attribute table below should provide an excellent start in making the right choice. You can click the detector type link in the table below for more details regarding that specific detector.

ORTEC also has several unique detectors that are application specific as well as the capability to design and manufacture specialty detectors. Select the links below for more details.

FWHM Resolution (in keV) @ Specified Energy

Detector Series

Typical Counting
Geometry

Relative Efficiency
Range (%)

5.9 keV

122 keV

1332 keV

GEM
P-type coaxial

Point source
Large surface area source
Marinelli beaker

10-150

n/a

0.80-1.30

1.75-2.30

Profile C
P-type coaxial

Point source
Large surface area source
Marinelli beaker

20-175

0.73-1.23

0.85-1.30

1.80-2.30

Profile M
P-type coaxial

Point source
Large surface area source

20-175

n/a

0.88-1.30

1.80-2.20

Profile S
P-type semi-planar

Point source
Large surface area source

7-65

0.35-0.50

0.65-0.70

1.80-1.90

Profile SP
P-type semi-planar

Point source
Large surface area source

7-50

0.30-0.43

0.59-0.63

1.80-1.90

Profile F
P-type semi-planar

Point source
Large surface area source

7-60

n/a

0.65-0.85

1.80-2.10

GMX
N-type coaxial

Point source
Large surface area source
Marinelli beaker
Neutron background

10-100

0.60-1.20

n/a

1.80-2.5

GLP
P-type planar

Point source
Small surface area source
Timing

n/a

0.17-0.39

0.48-0.60

n/a

GWL
P-type reverse
coaxial (well)

Small volume source
inside of the well

90-450 cc
active volume
(15%-100% rel. eff.)

n/a

1.20-1.40

2.10-2.30



Application Most Suitable Detector(s)
Synchrotron light studies; Soft X-ray (fusion) research
GLP
Large environmental samples with complex spectra
GEM, GEM-F, GEM-M, GEM-C, GEM-S, (low-background recommended)
Environmental samples on filter media, dishes or bottles
GEM-F, GEM-C, GEM-S, GEM, GMX
Small environmental samples
GWL (low-background recommended)
High-grade fissile materials / Safeguards
SGD, SGD-GEM
Neutron activation analysis
GMX (PLUS option recommended)
Post-accident monitoring
GEM (PLUS option recommended)
Compton-suppressed gamma spectroscopy
GMX
Sea or airborne surveillance
Micro-trans-SPEC, trans-SPEC-DX-100T, IDM-200-V
Lung monitoring
GEM-S, Actinide-85
Measurements in-beam or near fast-neutron fields
GMX (special internal heater for in-situ neutron damage anneal recommended)
Waste assay Micro-trans-SPEC, trans-SPEC-DX-100T, GEM, GMX, GEM-C, GEM-S, IDM-200-V
Freight / Border Security
Micro-Detective, Detective-EX, Detective-DX, Detective-200, IDM-200-P, IDM-200-V
In-Situ environmental spectroscopy
Micro-trans-SPEC, trans-SPEC-DX-100T, GEM, GMX, GEM-C, GEM-S, IDM-200-V