ORTEC GEM15P4 User Manual

GEM Series Coaxial HPGe Detector
Product Configuration Guide
U
ltra-High Count-Rate Preamplifier Option (-PL)
The Ultra-High Count-Rate Preamplifier (transistor-reset preamplifier), can handle input count rates up to
1,000,000 counts/s at 1 MeV, offers the added benefit of having no feedback resistor.
Harsh Environment Option (-HE)
The Harsh Environment option is a rugged carbon fiber endcap with a sealed electronics housing featuring
a replaceable desiccant pack which ensures that the electronics stay 100% dry and indicates when it
needs to be replaced.
GEM series detectors in PopTop capsules of 76 mm diameter or larger can be supplied with this option.
Remote Preamplifier Option (-HJ)
This option allows all the preamplifier and high voltage connections to be outside a shield and removes the preamplifier and high voltage filter from the “line-
of-sight” to the Ge crystal. For low background applications, this option eliminates any possible preamplifier or high voltage filter components that may add to
the background inside a shield.
Low-Background Carbon Fiber Endcap Options (-RB, -LB-C, and -XLB-C)
Carbon Fiber is as strong as Al, Mg, and Cu, creates less background, does not corrode, and can detect energies less than 10 keV.
This lower background material allows for lower Minimum Detectable Activity (MDA) for a specific counting time, which provides another step in increasing
sample throughput in low-background counting applications. The lower Z of Carbon Fiber provides a low-energy window without the additional background
found in most alloys. See Figures 6 and 7 for transmission characteristics of the Be and carbon fiber windows.
Carbon Fiber, unlike Beryllium, is non-toxic and can be cleaned with most laboratory solvents such as methanol,
trichloroethylene, and acetone. Soap and water may also be used. Abrasive cleaners should not be used.
Fig. 7. Low Energy Gamma and X-Ray
Transmission of Be and Carbon Fiber
Windows.
3
Fig. 6. Transmission through Be and Carbon.
Fig. 5. -HE Detector Option
(Carbon Fiber Endcap).
Base Model
(example) PopTop or Streamline
Endcap
Diameter
ICS Option
(if required)
Window Option
(if required)
Preamplifier Option
(if required)
High Voltage
Option
(if required)
GEM10 P4 (PopTop)
(Streamline)
-70
-76
-83
-95
-108
-ICS-E
-ICS
-ICS-LB
-RB
-HE
-LB-C
-XLB-C
-PL
-HJ
-SMP
Defining the Detector Model
• See ordering information for option compatibility.

ORTEC GEM15P4 Specifications

General

Brand	ORTEC
Model	GEM15P4
Category	Security Sensors
Language	English