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.