Searching plutonium from a travelling vehicle by neutron measurements

For search and detection of concealed nuclear material a conventional car has been equipped with a sensitive radiation measurement system. The results are displayed live on a handheld PC in the front of the car: Neutron intensities on the left and right side and gamma-measurement with GPS information. The typical measuring time is 1 second. When driving slowly (< 20 km/h) less than 500 g Pu are detected in houses clearly. Even passing faster still a rise in count rate was monitored for velocities up to 40 km/h. This system may be used to discover illicit trafficking of nuclear material and thus prohibit nuclear proliferation.