Direct X-ray Imaging of $\mu$m precision using Back-Illuminated CCD
  A charge-coupled device (CCD) is a standard imager in optical region in which the image quality is limited by its pixel size. CCDs also function in X-ray region but with substantial differences in performance. An optical photon generates only one electron while an X-ray photon generates many electrons at a time. We developed a method to precisely determine the X-ray point of interaction with subpixel resolution. In particular, we found that a back-illuminated CCD efficiently functions as a fine imager. We present here the validity of our method through an actual imaging experiment. 
E. Miyata, M. Miki, H. Tsunemi, J. Hiraga, H. Kouno (Osaka University)   K. Miyaguchi (HPK)