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ORTEC GEM10P4 Configuration Manual

ORTEC GEM10P4 Configuration Manual

Gem series coaxial hpge detector

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®
ORTE
P-type Coaxial HPGe Detectors for High Performance Gamma
Spectroscopy in the Energy Range of ~40 keV and Up.
The majority of gamma spectroscopy applications such as those found in counting laboratories
involve the energy range ~40 keV upward. ORTEC GEM and Profile Series GEM detectors are
designed to cover this energy range.
All GEM Series feature:
• Efficiencies to 150%, higher on request.
• Excellent energy resolution and peak symmetry.
• Specified crystal dimensions in Profile models.
• SMART bias options.
• Harsh Environment (-HE) option.
• Low-background carbon fiber endcap options.
• PLUS preamplifier option for ultra-high-rate applications.
• Huge configuration flexibility: PopTop, Streamline and mechanically cooled options.
ORTEC offers GEM Series HPGe detectors with relative efficiencies
detectors are manufactured from ORTEC-grown germanium crystals processed in our advanced
manufacturing facility in Oak Ridge, TN. The detectors are fabricated from P-type germanium with an outer contact of diffused Li and an inner contact of
ion-implanted boron.
ORTEC maintains a large stocklist of GEM detectors. Some of these have "super specifications," that is, a warranted energy resolution better than the usual
GEM warranted specifications.
The Following Specifications are Provided for each GEM Detector
• Energy resolution full-width half-maximum (FWHM) at 1.33-MeV and optimum shaping time.
• Relative Photopeak efficiency at 1.33 MeV.
• Peak-to-Compton ratio at 1.33 MeV.
• Peak shape ratio for the full-width tenth-maximum to the full-width half-maximum at 1.33 MeV.
• Energy resolution at 122 keV at optimum shaping time.
Configuration Guidelines
PopTop or Streamline (non-PopTop) Configuration
The essence of a PopTop detector system is that the HPGe detector element cryostat, preamplifier, and high voltage filter are housed in a detector "capsule"
which is then attached to an appropriate cryostat (Figure 2.)
In Streamline systems, the detector capsule is NOT demountable. Detector capsule and cryostat share the same vacuum. In configuration terms, this requires
a cryostat or cryostat/dewar selection with the cryostat having a matching diameter to the capsule endcap or an integrated cryocooling system (ICS). A
cryostat or ICS must always be ordered with a Streamline capsule, because they are integral.
The actual PopTop capsule has its own vacuum. It can be mounted on any of the available cryostats, cryostat/dewar combinations, or the X-COOLER III or
ICS-P4 mechanical cooling systems.
Certain cryostat configurations are available only as PopTop and others are available only as Streamline.
By convention, HPGe detectors are characterized by "relative efficiency". Relative efficiency is defined as the efficiency of a point Co-60 source at 25 cm from the face of a
1
standard 3-inch x 3-inch right circular cylinder NaI(Tl) detector. "IEEE Test Procedures for Germanium Detectors for Ionizing Radiation," ANSI/IEEE Standard 325-1986.
GEM Series Coaxial HPGe Detector
from 10% to 150% and beyond. The
1
Product Configuration Guide
Fig. 1. Configuration of GEM Coaxial Germanium
Crystal.

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Summary of Contents for ORTEC GEM10P4

  • Page 1 Oak Ridge, TN. The detectors are fabricated from P-type germanium with an outer contact of diffused Li and an inner contact of ion-implanted boron. ORTEC maintains a large stocklist of GEM detectors. Some of these have "super specifications," that is, a warranted energy resolution better than the usual GEM warranted specifications.
  • Page 2: Detector Options

    GEM Series Coaxial HPGe Detector Product Configuration Guide Steps to Configure Your ORTEC HPGe Detector 1) Configure the Detector Model • Capsule type (PopTop or Streamline) • Ge Crystal efficiency and specifications • Endcap and window • Mount • Preamplifier •...
  • Page 3 GEM Series Coaxial HPGe Detector Product Configuration Guide Ultra-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...
  • Page 4 GEM Series Coaxial HPGe Detector Product Configuration Guide PopTop Detector Capsule Endcap Diameter Preamplifier default is Resistive Feedback Cup default is Al -70, -76, -83, -95 or -108 -PL changes to Transistor Reset -RB changes to Cu -SMP changes to SMART-1 with HV Preamplifier Outside Vacuum Preamplifier...
  • Page 5 GEM Series Coaxial HPGe Detector Product Configuration Guide Streamline Detector Capsule for Integrated Cryocooling System with Internal Preamplifier (ICS) Endcap Diameter Preamplifier default is Resistive Feedback Cup default is Al -70, -76, -83, -95 or -108 -PL changes to Transistor Reset -ICS-LB changes to -SMP changes to SMART-1 with HV low-background Al...
  • Page 6 GEM Series Coaxial HPGe Detector Product Configuration Guide Streamline Cryostat and Cryostat/Dewar Assemblies Streamline systems (detector capsule and cryostat) share the same vacuum, requiring a cryostat or cryostat/dewar selection with the cryostat having a matching diameter to the capsule endcap. -XLB adds Diameter must Standard Dewars are DWR-...
  • Page 7 GEM Series Coaxial HPGe Detector Product Configuration Guide PopTop and Streamline Dimensional Data Streamline systems (detector capsule and cryostat or ICS) share the same vacuum. A cryostat or ICS must be ordered with a Streamline capsule. The cryostat or cryostat/dewar selection must have a matching diameter to the capsule endcap. The PopTop capsule features an internal vacuum arrangement.
  • Page 8 GEM Series Coaxial HPGe Detector Product Configuration Guide Note: Cryostat/Dewar drawings are NOT to scale, see tables that follow for complete dimensions. Dimensions are for reference only and subject to change, if dimensional constraints are critical, contact the factory. CFG-SH, DWR-30 CFG-SH, MOBIUS-ST CFG-PH4, DWR-30 CFG-PH4, MOBIUS-PT...
  • Page 9 GEM Series Coaxial HPGe Detector Product Configuration Guide Note: Cryostat/Dewar drawings are NOT to scale, see tables that follow for complete dimensions. Dimensions are for reference only and subject to change, if dimensional constraints are critical, contact the factory. CFG-PH4, DWR-30-OP CFG-SH, DWR-30-OP CFG-PSHP4 or CFG-PD4-30 (or -13 or -7.5) or...
  • Page 10 GEM Series Coaxial HPGe Detector Product Configuration Guide Note: Cryostat/Dewar drawings are NOT to scale, see tables that follow for complete dimensions. Dimensions are for reference only and subject to change, if dimensional constraints are critical, contact the factory. CFG-SJ, DWR-30B (or -13B or -7.5B) CFG-SJ, MOBIUS-B CFG-HJ, DWR-30B (or -13B or -7.5B) CFG-HJ, MOBIUS-B...
  • Page 11 GEM Series Coaxial HPGe Detector Product Configuration Guide CFG-X-COOL-III PopTop GEM Detector Dimensions • Dimensions are for reference only and subject to change. • If dimensional constraints are critical, contact the factory. CFG-ICS-P4 Endcap Model (dia. mm) -108 % Efficiencies available in this 0–35 25–45 25–65...
  • Page 12 GEM Series Coaxial HPGe Detector Product Configuration Guide Streamline GEM Detector Dimensions • Dimensions are for reference only and subject to change. • If dimensional constraints are critical, contact the factory. Standard or LB Endcap Model (dia. mm) -108 -108 % Efficiencies available in this 0–35 25–45...
  • Page 13 GEM Series Coaxial HPGe Detector Product Configuration Guide Note: Cryostat/Dewar drawings are NOT to scale, see tables that follow for complete dimensions. Dimensions are for reference only and subject to change, if dimensional constraints are critical, contact the factory. CFG-PG4-1.2 (or -3 or -5) or CFG-GG, DWR-1.2G (or -3.0G, -5.0G) CFG-PMOD4-3 (or -7) or DWR-S/F...
  • Page 14 GEM Series Coaxial HPGe Detector Product Configuration Guide Note: Cryostat/Dewar drawings are NOT to scale, see tables that follow for complete dimensions. Dimensions are for reference only and subject to change, if dimensional constraints are critical, contact the factory. CFG-ICS or CFG-ICS-E...
  • Page 15 GEM Series Coaxial HPGe Detector Product Configuration Guide Streamline GEM Detector Dimensions for ICS Integrated Cryocooling System • Dimensions are for reference only and subject to change. • If dimensional constraints are critical, contact the factory. Endcap Model (dia. mm) -108 % Efficiencies available in this 0–35...
  • Page 16 GEM Series Coaxial HPGe Detector Product Configuration Guide Example Model Numbers PopTop Configuration GEM10P4-70 10% efficiency GEM detector with 70-mm diameter endcap. CFG-PH4 Horizontal Dipstick type cryostat. MOBIUS-PT Möbius Recycler. GEM35P4-76-SMP 35% efficiency GEM detector with 76-mm diameter endcap and SMART-1 preamplifier and high voltage supply.
  • Page 17: Ordering Information

    • 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.
  • Page 18 GEM Series Coaxial HPGe Detector Product Configuration Guide GEM PopTop Cryostats and Dewars Model No. Description CFG-MG4-1.2G Gamma Gage Cryostat with 1.2-liter Dewar, Pistol Grip handle and mounting holes to fit the M-1-T1 Tripod (for 83 mm or smaller endcaps) CFG-PD4-7.5 Down-looking Cryostat with 7.5-liter Dewar CFG-PD4-13...
  • Page 19 GEM Series Coaxial HPGe Detector Product Configuration Guide GEM Streamline Cryostats • Append matching Detector Endcap Size designation to cryostat model: -70, -76, -83, -95, -108 [e.g., CFG-SJ-95 for GEM75-95, or CFG-SL-XLB-76 for GEM25-76-XLB-C] • Dewar required. Select dewar from GEM Streamline Dewars. Model No.
  • Page 20 GEM Series Coaxial HPGe Detector Product Configuration Guide GEM Streamline Dewars For Cryostat Choose Description CFG-GG DWR-1.2G 1.2-liter All-Orientation Dewar DWR-3.0G 3.0-liter All-Orientation Dewar DWR-5.0G 5.0-liter All-Orientation Dewar DWR-MOD-3L 3-liter Multi-Orientation Dewar DWR-MOD-7L 7-liter Multi-Orientation Dewar DWR-0.7-SHP-1 0.7-liter Shallow-Hole Probe Dewar DWR-S/F Storage/Fill Dewar for DWR-XG CFG-HJ, SJ, SL...