SGD-Planar Safeguards Radiation Detectors
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High-Performance Germanium Planar 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 planar 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 planar detectors feature the following: • Choice of fixed, portable, and custom cryostats, including the latest MOD multi-orientation dewar option. • Robust aluminum endcap • Streamline preamplifier assembly • LN -Free option 2 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 at ±12 and ±24 V. Application Considerations For safeguards accountancy measurements involving the verification of declared materials values, the sample is usually presented in a pure form in a purposedesigned thin-walled container. This occurs with routine safeguards inspection programs, when a portable

High-Performance Germanium Planar Detectors for Safeguards and Non-Destructive Assay Product Configuration Guide The Following Specifications are Provided for SGD Planar Detectors • Active crystal diameter and depth. • Energy resolution at 122 keV photons from 57Co at 1 kcps and optimum shaping time. • Shape specifications for Full Width Tenth Maximum (FWTM) to Full Width Half Maximum (FWHM) and Full With Fiftieth Maximum (FWFM) to FWHM at <50 kcps for 122 keV photons from 57Co. • SGD-16550P4 only: High rate specification of energy resolution at 122 keV photons from 57Co at 50 kcps with 1...

Detector Options SMART-1 Option (-SMN) The SMART-1 option monitors and reports on vital system functions, and can save authentication codes and report the code at a later time. It has the high voltage included, so none of the instruments require an external high-voltage power supply. The SMART-1 is housed in a rugged ABS molded plastic enclosure and is permanently attached to the detector endcap via a molded-strain-relieved sealed cable. This eliminates the possibility that the detector will suffer severe damage from moisture leaking into high-voltage connectors. The SMART-1 can be...

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

Streamline Cryostat and Cryostat/Dewar Assemblies High-Performance Germanium Planar 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 Thermal Element Standard Cryostat uses Molecular Sieve Pumping Agent. Diameter must match Endcap Diameter -70 Thermal Element Standard Cryostat uses Molecular Sieve Pumping Agent. Optional Dewars are...

High-Performance Germanium Planar 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...