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GRABIT is the gamma-ray bar imaging telescope, a low-energy gamma-ray (60-600 keV) imaging spectrometer that can be extended to a large area at low cost. GRABIT has a gamma-ray position-resolution of 2 mm with an energy resolution typical of alkali-halide detectors (18% at 60 keV). The complete coded-aperture telescope will have arc-minute angular resolution over a large field of view. In addition, the good energy and angular resolutions are obtained over the full bandwidth of the instrument.

The Gamma Ray Imaging System is an instrument designed to be positioned at a moderate distance from a missile and detect the radiation emitted by the nuclear warheads in the missile. This instrument is vital in arms control verification scenarios which require a remote, non-visual inspection of warheads in a missile-delivery system. The system was evaluated and the operating principles and capabilities, advantages and disadvantages of the system were discussed.