A NEW METHOD FOR THE DETECTION OF SYNCHROTRON AND ELECTRON EXCITED KOSSEL-REFLEXES J. Bauch, H.-J. Ullrich, R. Röder TU Dresden, Institut für Werkstoffvissenschaft, Mommsenstr. 13, D-1062 Dresden

The KOSSEL-technique is a method for the determination of lattice constants, crystallographic orientation, tetragonal distortions of cubic lattices, scattering phases, and the assessment of dislocation densities. In 1992 we performed first synchrotron excited KOSSEL experiments at beamline L at HASYLAB by using X-ray film and 1995 by using high resolution image plates. The investigations were performed by means of the FUJI FDL 5000, an image plate reader originally intended for electron microscopy. For this measurements a pixel size of 25 um x 25 um was used, which results in a high spatial resolution of the image. Thus 3760 x 3000 pixels are scanned according to the effective area of the image plate of 94 mm x 75 mm. The signal is digitalized to 14 bit. To recording one KOSSEL image it is necessary to exposure six of this image plates in one ,,shot". This allows to record KOSSEL lines, although the intensity is not very different compared to the background. The advantages of this new method to recording KOSSEL images and a comparison between image plates and X-ray film are described.