| Abstract: | Various technologies pertaining to identifying a material in a sample and
imaging the sample are described herein. The material is identified by
computing energy-dependent attenuation of neutrons that is caused by
presence of the sample in travel paths of the neutrons. A mono-energetic
neutron generator emits the neutron, which is downscattered in energy by
a first detector unit. The neutron exits the first detector unit and is
detected by a second detector unit subsequent to passing through the
sample. Energy-dependent attenuation of neutrons passing through the
sample is computed based upon a computed energy of the neutron, wherein
such energy can be computed based upon 1) known positions of the neutron
generator, the first detector unit, and the second detector unit; or 2)
computed time of flight of neutrons between the first detector unit and
the second detector unit. |