There are converter materials emitting light when they absorb neutrons.  DNR is a branch of neutron radiography taking the camera images for the light from the converter having the characteristics of the moving objects in view of neutron attenuation.  Considering that the neutron flux at the ENF is very high and the shielding room is very large, the ENF is a world-class facility as far as DNR is concerned.  Fig. 3  is a image of surface wave taken at the ENF by using DNR.