SGD-GEM Safeguards Radiation Detectors
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High-Performance Germanium Coaxial Detectors for Safeguards and Non-Destructive Assay Product Configuration Guide • Specifically designed to meet the demanding requirements of isotopic ratio software codes used in Safeguards and NDA. • Excellent resolution is maintained over a wide range of count rates, enhancing measurement flexibility. • Available in a full range of crystal diameters. • Extensive range of cryostats with multi-orientation dewar options for applications requiring portability. • Compatible with all existing Safeguards multichannel analyzers. The precise measurement of isotopic ratios required in Safeguards and non-destructive assay (NDA) applications places a severe demand on the techniques of gamma-ray and x-ray spectroscopy. Figure 1 demonstrates the complexity of the 90–130 keV region of a typical Pu spectrum. The choice of energy region(s) for analysis depends specifically on the sample type and origin and the material matrix. National laboratory software codes1 written to obtain highly accurate isotopic ratios, must deal with these spectra to analyze low-energy and/or high-energy regions in which groups of peaks are located close together. Each code requires exceptional system resolution and stability in order to achieve accurate unfolding of these regions. Recent safeguards development trends have led to a growing requirement of isotopic ratio determinations involving higher energy gamma-rays. Such needs spring from the need to measure attenuated samples, such as those found in waste assay and in certain homeland security applications. Software codes such as FRAM and MGAHI2 can now determine Pu isotopic ratios from the higher energy regions of the spectrum. As a consequence, it is desirable to produce HPGe detectors that offer improved higher energy performance, while maintaining the excellent resolution characteristics required in such applications. The ORTEC Safeguards series include both coaxial and planar geometry detectors, specifically designed to meet the demands of the applications software used for isotopic ratio determination, have been developed to strike an optimum balance between low-energy resolution and high-energy efficiency. SGD series detectors are compatible with ALL conventional MCA types, although optimum performance will be obtained when used with the ORTEC Digital Signal Processing Spectrometers. Fig. 1. The 90 to 130 keV region of a typical plutonium spectrum. All SGD detectors feature the following: • Choice of fixed, portable, and custom cryostats, including the latest MOD multi-orientation dewar option. • Robust aluminum end-cap • Streamline preamplifier assembly • LN2-Free option The latest low-power resistive feedback preamplifier with "no ring" output, suitable for use with all existing types of MCA systems. Power consumption less than 25 mA

Application Considerations For samples in thick walled containers, or when significant matrix attenuation is present, it may be necessary to use a higher energy region of the spectrum to perform the analysis. In these cases, the SGD-GEM detectors, which are coaxial or semi-coaxial, have been developed to strike an optimum balance between low-energy resolution and high-energy efficiency. The SGD-GEM-5050P4 is the "traditional" coaxial detector for use with FRAM3 in a wide variety of cases, including the measurement of UF6 cylinders. The SGD-GEM-5030P4 has a semi-planar geometry and can be...

Steps to Configure Your ORTEC HPGe Detector 1) Configure the Detector Model • Capsule type (PopTop or Streamline) • Ge Crystal dimensions and specifications • Endcap and window • Mount • Preamplifier • Cable Package Preamplifier options are available. 2) Configure the Cryostat/Dewar Model • Vertical Dipstick style (separate Dewar or Mobius Recycler) • Horizontal Dipstick style (separate Dewar or Mobius Recycler) • Portable with all-position or multi-position cryostat/dewar models • Downlooking designed to be oriented with the detector pointing down • Sidelooking designed to be oriented with...

High-Performance Germanium Coaxial Detectors for Safeguards and Non-Destructive Assay Product Configuration Guide Streamline Detector Capsule Electronic Shroud Preamplifier Outside Vacuum Preamplifier default is Resistive Feedback -SMP changes to SMART-1 with HV High Voltage Filter PopTop Detector Capsule Preamplifier default is Resistive Feedback -SMP changes to SMART-1 with HV Preamplifier Outside Vacuum PopTop Cold Finger Coupling High Voltage Filter Electronic Shroud

Streamline Cryostat and Cryostat/Dewar Assemblies High-Performance Germanium Coaxial Detectors for Safeguards and Non-Destructive Assay Product Configuration Guide 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. Diameter must match Endcap Diameter -70 or -83 Standard Cryostat uses Molecular Sieve Pumping Agent. Diameter must match Endcap Diameter -70 or -83 Standard Dewars are DWR-7.5D, 13D, or 30D Standard Cryostat uses Molecular Sieve Pumping...

High-Performance Germanium Coaxial Detectors for Safeguards and Non-Destructive Assay Product Configuration Guide PopTop and Streamline Dimensional Data 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. A cryostat must be ordered with a Streamline capsule. The PopTop capsule features an internal vacuum arrangement. It can be mounted on any of the available PopTop cryostats, cryostat/dewar combinations, or the X-COOLER III mechanical cooling system. The...

High-Performance Germanium Coaxial Detectors for Safeguards and Non-Destructive Assay 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, MOBIUS-B