  We introduce a novel technique, neutron-gamma emission tomography (NGET), for
rapid detection, 3D imaging, and characterization of special nuclear materials
like weapons grade plutonium and uranium. The technique is adapted from
fundamental nuclear physics research and represents a paradigm shift in the
approach to detection and imaging of small quantities of such materials. The
method uses a granular detection system based on fast organic scintillators,
measuring the characteristic fast time and energy correlations between
particles emitted in nuclear fission processes. The radically new approach of
using such correlations in real time in conjunction with modern machine
learning techniques provides unprecedented imaging efficiency, spatial
resolution and ultra-low false alarm rates, addressing global security threats
from terrorism, the proliferation of nuclear weapons, as well as different
nuclear accident scenarios and environmental radiological surveying.
