The CAIS-designed Gamma Isotope Mapping System (GIMS) enables
the rapid collection of surficial sediment data in any type of
aquatic environment, providing:
The GIMS has a variety of proven applications, including assessment of offshore mineral resources, monitoring of offshore dredged sediment disposal sites, establishment of baseline conditions in environmentally sensitive areas.
The system is comprised of a gamma radiation detector mounted
aboard a towed platform to determine sediment surface gamma activities
of 214Bi, 208Tl, and 40K, all "pathfinder" elements
that are indicative of the nature of sediments. These activities
can be used to interpret and map the types of surficial sediments
present. With minor system adjustments, anthropogenic isotopes
such as 137Cs can also be readily monitored.
The system can be deployed in water depths of up to 100 meters and towed at speeds of 2 to 3 knots along survey transects. Two- and three-dimensional bathymetric and isotopic maps are generated in near real time during the survey process.