The Raytheon-SORDS trimodal imager
2009
The Raytheon Trimodal Imager (TMI) uses coded aperture and Compton imaging technologies as well as the nonimaging
shadow technology to locate an SNM or radiological threat in the presence of background. The coded aperture
imaging is useful for locating and identifying radiological threats as these threats generally emit lower energy gammas
whereas the Compton imaging is useful for SNM threats as in addition to low energy gammas which can be shielded,
SNM threats emit higher energy gammas as well. The shadow imaging technology utilizes the structure of the
instrument and its vehicle as shadow masks for the individual detectors which shadow changes as the vehicle moves
through the environment. Before a radioactive source comes into the fields of view of the imagers it will appear as a
shadow cast on the individual detectors themselves. This gives the operator advanced notice that the instrument is
approaching something that is radiological and on which side of the vehicle it is located. The two nuclear images will be
fused into a combined nuclear image along with isotope ID. This combined image will be further fused with a real-time
image of the locale where the vehicle is passing. A satellite image of the locale will also be made available. This
instrument is being developed for the Standoff Radiation Detection System (SORDS) program being conducted by
Domestic Nuclear Detection Office (DNDO) of the Department of Homeland Security (DHS).
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