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safeguards planar detector8. The data in Figure 4 show clearly that the DigiDART is capable of equivalent performance to the highest quality lab systems, both analog and digital. Even at 100 kHz input rate, the peak FWHM from the digiDART is 600 eV, which meets the stringent requirements of the isotopic codes such as PC/FRAM and MGA. At 100 kHz, the Digidart shows almost 10 and 51% higher throughput than the DSPEC + and NIM Analog systems respectivley, with almost equal resolution (only 1.5% or 9 eV worse

than the NIM system).

Figure 4

Model

Active Diamete r (mm)

Thicknes s (mm)

Energ y (keV)

FWHM @ 1 kcps (6 s shaping)

FWHM @ 1 kcps (2 S shaping)

FWHM @ 30 kcps (2 S shaping)

SGD-GEM-25175

50

50

122 1332

750eV 1.75Kev

870 eV 1.95 keV

880 eV 2.0 keV

Measurements were also made with an ORTEC Safeguards GEM 25, 25% relative efficiency, coaxial detector with the following warranted specifications:

The SGD-GEM detector type was developed specifically to meet the needs of PC/FRAM in high-energy mode. A smaller version of this detector has recently been tested for use with MGA in so-called 2-detector mode, with successful results9. This detector and a larger nominally 50% relative efficiency type have been specified for use in the Los Alamos Tomographic Gamma Scanner (TGS)10. Figure 5 shows total throughput curves

as a function of input count rate. All except the upper curve were measured with an 0.8uS filter flat top The upper

Figure 5 Total system throughput performance: coaxial detector

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