Gamma-Ray Imaging Spectrometer (original) (raw)

The Gamma-Ray Imaging Spectrometer (GRIS) was a gamma-ray spectrometer instrument on a balloon-borne airborne observatory. It used germanium detectors to achieve high resolution spectroscopy. GRIS was operated from 1988 to 1995 by NASA's Goddard Space Flight Center, which called it "arguably one of the most successful gamma-ray balloon programs in history".