GEM Series Coaxial HPGe Detector
Product Configuration Guide
17
Ordering Information
• For Streamline, remove the “P4” from the model number.
• Endcap Diameter must be specified, see Endcap Diameter.
• FWHM = Full Width at Half Maximum; FW.1M = Full Width at One-Tenth Maximum; FW.02M = Full Width at One-Fiftieth Maximum; total system resolution
for a source at 1000 counts/s measured in accordance with ANSI/IEEE Std. 325-1996, using ORTEC standard electronics. The FW.02M/FWHM
specification is typical, not warranted.
• If dimensional considerations are critical, contact factory.
• Cryostat and dewar or other cooling device are not included with detector and are required for operation.
• A cryostat must be ordered with a Streamline detector.
• Monte Carlo drawing included.
Model No.
Efficiency
(%)
Resolution
Peak-to-Compton
Ratio
Peak Shape
Endcap Diameter
(mm)
@122 keV
(keV)
@1.33 MeV
(keV)
FW.1M/
FWHM
FW.02M/
FWHM typical
GEM10P4
GEM15P4
GEM20P4
GEM25P4
GEM30P4
GEM35P4
GEM40P4
GEM45P4
GEM50P4
GEM55P4
GEM60P4
GEM65P4
GEM70P4
GEM75P4
GEM80P4
GEM90P4
GEM100P4
GEM110P4
GEM120P4
GEM130P4
GEM140P4
GEM150P4
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
90
100
110
120
130
140
150
0.80
0.82
0.82
0.82
0.85
0.85
0.87
0.90
0.90
1.00
1.00
1.00
1.00
1.10
1.10
1.20
1.20
1.30
1.30
1.30
1.30
1.30
1.75
1.80
1.80
1.85
1.85
1.85
1.85
1.90
1.90
1.90
1.95
1.95
2.0
2.0
2.0
2.0
2.1
2.1
2.1
2.1
2.2
2.3
41:1
46:1
52:1
56:1
60:1
62:1
64:1
64:1
66:1
67:1
70:1
73:1
75:1
77:1
77:1
80:1
83:1
85:1
86:1
90:1
90:1
90:1
1.9
1.9
1.9
1.9
1.9
1.9
1.9
1.9
1.9
1.9
1.9
1.9
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.8
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.1
3.1
3.1
3.1
-70
-70
-70
-70, -76, -83
-70, -76, -83
-70, -76, -83
-76, -83
-76, -83
-83
-83
-83, -95
-83, -95
-95
-95
-95
-95
-95
-95
-108
-108
-108
-108
GEM Detector Options
• Append model to detector model number.
• Consult factory for low-background ICS with external preamp.
Model No. Description
-RB PopTop Only. Reduced background PopTop capsule with Carbon Fiber endcap, add “-RB” to the model number.
-HE PopTop Only. Harsh Environment PopTop capsule for detectors 76 mm and larger, add “-HE” to the model number.
-PL PLUS Ultra-high-count-rate Preamplifier, add “-PL” to the model number. Not compatible with -HJ option.
-SMP SMART-1 detector option for positive bias detector, add “-SMP” to the model number. Not compatible with -HJ option.
-LB-C Streamline Only. Low-Background Detector with Carbon Fiber Endcap, add “-LB-C” to the model number. Requires selection of a Low-Background LB
cryostat.
-XLB-C Streamline Only. Extra-Low-Background Detector with Carbon Fiber Endcap, add “-XLB-C” to the model number. Requires selection of a Low-
Background XLB cryostat.
-HJ Streamline Only. Remote preamplifier and high voltage filter for use with HJ type cryostat, add “-HJ” to the model number. Requires selection of HJ
cryostat. Not compatible with -PL or -SMP options.
-ICS-E Streamline Only. Integrated Cryocooling System with external preamp. Cryostat sealed with a cryocooler and immune to thermal short cycling, add
“-ICS-E” to the model number. Requires selection of an ICS-E cryostat.
-ICS Streamline Only. Integrated Cryocooling System with Internal Preamp. Cryostat sealed with a cryocooler and immune to thermal short cycling, add
“-ICS” to the model number. Requires selection of an ICS cryostat.
-ICS-LB Streamline Only. Integrated Cryocooling Low-Background System with Internal Preamp, High Purity Al Endcap and Cu Mount, add “-ICS-LB” to the
model number. Requires selection of an ICS cryostat.
