Provide a mobile system for the stand-off detection, identification, and localization of radioactive materials for the detection of hidden special nuclear materials.
The system was required to detect a 1 milliCurie source in 20 seconds at 100 meters and provide isotope identification and 3-D localization to 10 meters with at most one false positive for every 8 hours of observations.
The Mobile Imaging and Spectroscopic Threat Identification (MISTI) system was designed and built for DHS/Domestic Nuclear Detection Office. It consists of a hybrid system with two separate gamma-ray detection instruments.
- An array of 28 High Purity Germanium (HPGe) detectors provides excellent spectroscopy and unique isotope identification
- An array of sodium iodide detectors combined with a coded aperture provide two dimensional gamma-ray imaging
- By combining many 2-D images using GPS position and pointing, three-dimensional source positions are derived
- NRL built, integrated, and tested system in 24 months
- NRL delivered system to DNDO on schedule and under budget
- MISTI fully met original sponsor requirements
- At Sponsor direction: NRL transitioned MISTI to DOE in October 2011; will also be using variants of MISTI for background measurement campaigns in the future