The C7716 series X-ray image intensifier (I. I.) camera unit now offers greatly improved  X-ray  detection  efficiency  even  at  low  energy  levels.  This  improve-ment stems primarily from a built-in X-ray image intensifier having an extreme-ly thin aluminum input window. Its thickness is only 0.3mm or less, virtually at the  limit  of  present  technology  providing  excellent  X-ray  transmit-tance  and  low scattering.The results are sharp, clear, high-quality images taken at low energy X-ray lev-els down to several keV which penetrate plastic (PET) materials.