ORTEC Logo

Home | Applications | Contact Us
Products | Service | Training
Download PDF

Germanium Detector Stocklist

PINS-GMX Portable Isotopic Neutron-Spectroscopy Gamma-X Detector

The Portable Isotopic Neutron-Spectroscopy GAMMA-X (PINS-GMX) detector was created from a joint development of ORTEC and the Idaho National Engineering Laboratory* (INEEL) in response to the growing worldwide need to determine in situ the specific nature of the contents of a variety of containers of munitions or potential chemical weapons. Such applications require a detector with high resolution over a large range of energy, portability, neutron damage resistance, reliability, and ease of use. The performance of the PINS-GMX detector has been verified in real-world use by the U.S. Army. The detector is a component of the ORTEC PINS System, a brochure is available on request.

Features

  • High purity germanium (HPGe) detector with high-neutron damage resistance characteristics
  • Relative efficiency >40% for 1.33-MeV gamma ray of 60Co, relative to a 3-in. x 3-in. NaI(Tl) crystal at a 25-cm source-to-detector distance
  • Rugged 0.3-microns thick boron implant contact on all outer surfaces
  • Rugged all aluminum endcap with front window thickness of ≤1 mm
  • Detector crystal to endcap front distance ≤5 mm
  • Horizontal concentric type preamplifier
  • Preamplifier outputs capable of driving 150 feet of coaxial cable without measurable degradation to the pulse shape or resolution
  • Single connector with LEMO-type connection for test input, energy output, and preamplifier power at the detector
  • SHV-type high-voltage connector at the detector
  • 10-meter single cable (M-1-C10) MCA connection (other cable lengths available)
  • Hermetically sealed high voltage coupling
  • Minimum operating bias of –3000 volts, and typically operates at bias between –4000 and –5000 volts
  • All attitude portable style cryostat and dewar providing adequate cooling in any orientation if any liquid nitrogen is in the dewar
  • Dewar capacity of 1.2 liters liquid nitrogen, with nominal 20-hour holding time
  • High-rate indicator for excessive count rate
  • Internal temperature sensor providing necessary signal for high-voltage shutdown in the event of accidental warm up
  • A sensor is incorporated into the cryostat in such a way that if the detector warms up, a logic signal to gate off the high-voltage power supply will be generated
  • Can be safely thermal cycled to room temperature
pinsgmx.jpg (16928 bytes)Specifications

Resolution:
FWHM ≤1.95 keV at 1.33 MeV
FWTM ≤3.90 keV at 1.33 MeV
FWFM ≤5.85 keV at 1.33 MeV
Peak-to-Compton (pC) ratio >55:1
FWHM ≤825 eV at 88 keV
FWHM ≤750 eV at 22 keV
Peak area ratio from 109Cd at 22-keV to 88-keV >7
Ratio of 2.6-MeV to 1.33-MeV FWHM resolutions <1.5

The FWHM of a time spectrum taken with the detector and an 1-in. x 1-in. plastic scintillator with an energy window 100 keV wide and constant-fraction timing:
 

Energy Window Centroid (keV) FWHM (Nanoseconds)
150
250
350
511
1170		 ≤15.
≤12.
≤8.5
≤6.5
≤3.0


Capable of operating at energy rates >50,000 MeV/sec without preamplifier lockup and without deterioration in resolution beyond that contributed by the main amplifier

Ordering Information
 
Model   Description
PINS-GMX    Portable Isotopic Neutron-Spectroscopy Gamma-X Detector
PINS-OPT1   Special Single MCA Cable Connection Option   
B/PFA-1.2L   Bayonet Pressure Fill
DWR-S/F   Storage Fill Dewar
*CRADA 93-ST-12