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HK: Physik der Hadronen und Kerne

HK 21: Instrumentation and Applications II

HK 21.4: Vortrag

Dienstag, 12. März 2002, 18:00–18:15, F

X-ray phase contrast imaging at the Mainz microtron MAMI — •M. El Ghazaly, C. Ay, H. Backe, N. Clawiter, F. Hagenbuck, K.-H. Kaiser, G. Kube, W. Lauth, H. Mannweiler, H. Rochholz, Th. Walcher, and T. Weber — Institut für Kernphysik, Universität Mainz, J.-J. Becher Weg 45, 55099 Mainz

X-ray phase contrast imaging has been developed at Mainz Microtron (MAMI) using transition radiation (TR) generated by the external 885 MeV electron beam in a polymer foil stack. Phase objects as polymer strings of (20-370) µ m diameter and thin green leaves have been studied in poly-and monochromatic x-ray beams at photon energies between 5 keV and 41 keV as a function of the distance between the object and the high resolution Kodak and Agfa x-ray films. The contrast of the images is very high although the photoabsorption of the almost transparent materials is very low. The main characteristic of the image is edge enhancement which is largest where the density gradient has its maximum, i.e at the interfaces between different features of the object.
Work supported by the DFG under contract BA 1336/1-3.