The present invention relates systems and methods to determine the
location information of a signal made from a radioactive device or
hazardous material. The system employs multiple radiation sensor devices,
which his capable of determining the signal strength and the angle of
arrival of a radioactive signal. The mobile switching center sends a
request along with radiation information to a location processor, which
controls devices. The location processor sets up each sensor device to
track the radiation signal. If at least two devices are successful in
tracking the radioactive signals and returning information about the
radiation signal, then the location processor can determine the location
of the radioactive device or hazardous material by using a triangulation
method.