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National Aeronautics and Space Administration

Goddard Space Flight Center

Astrophysics Science Division | Sciences and Exploration

This website is kept for archival purposes only and is no longer updated.

GRIS Schematics

GRIS configuration schematic

GRIS Characteristics Table

GRIS flight record

The GRIS instrument is flown on a gondola from a high-altitude, helium-filled balloon at a typical altitude of ~40 km. The instrument consists of seven of the world's largest, high-purity, n-type germanium (Ge) detectors. The detectors are cooled to liquid nitrogen temperatures (in order to achieve high resolution) and are surrounded by a thick anti-coincidence shield which allows the rejection of background events from true astrophysical events.

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