| CHARACTERISTIC* |
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| Energy Range: |
20 to 8000 keV |
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| No. of Germanium Detectors: |
7 |
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| Energy Resolution: |
1.8 keV @ 500 keV (composite for all 7 detectors) |
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| Ge Detector Type: |
high-purity n-type coaxial |
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| Ge Detector Size: |
typically 6.5 cm diam. x 6.5 cm length |
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| Total Ge Detector Area: |
242 cm2 |
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| Total Ge Detector Volume: |
1560 cm3 |
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| Shielding: |
NaI active anticoincidence (15 cm min. thickness) |
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| Field-of-View: |
17 degree FWHM @ 500 keV |
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| 3 Sigma Narrow Line Sensitivity: |
1.7 x 10-4 ph cm-2 s-1 (E = 500 keV, T = 12 hr) |
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| Pointing System: |
azimuth over elevation; momentum wheel for azimuth control; magnetic reference; star camera and sun sensor for verification |
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| Power: |
350 W |
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| Experiment Weight: |
1634 kg (3600 lbs) |
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| Telemetry Rate: |
55.2 kbps |
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| * Parameters are those achieved in GRIS Flight II. |
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