Berlin 2005 – scientific programme

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M: Metallphysik

M 32: Poster TU B (Symposium Tomographic Methods in Materials Research M-32.32-55)

M 32.35: Poster

Monday, March 7, 2005, 14:30–16:30, Poster TU B

Combination of neutron tomography and X-ray tomography at FRM-II — •Michael Schulz and Burkhard Schillinger — Technische Universität München, 85747 Garching, Germany

The combination of neutron tomography and x-ray tomography can greatly enhance the field of application of computed tomography in non-destructive testing. Having different absorption coefficients for x-rays and neutrons, respectively more materials can be distinguished than with only one of the two methods. One of the major problems of combining different imaging methods is the alignment of the 3D datasets to each other (image registration). This difficulty can almost completely be avoided by using the same measuring geometry and detector setup for both measurements. For neutron tomography the radiographies are made in parallel beam geometry. As a detector we use a neutron sensitive scintillation screen and a CCD camera to record the scintillation image. Increasing the distance between our 320kV x-ray source and the sample position to approx. 12m, a nearly parallel beam geometry can be achieved for x-ray tomography, either. Thus it is possible to use the same reconstruction algorithm for the two datasets. This minimizes the differences in shape and orientation of the two 3D datasets. The detector is the same CCD camera as for neutron tomography in combination with a scintillation screen which is sensitive to both x-ray and neutrons. In this talk we will present the new x-ray tomography facility at the experimental reactor FRM-II in Garching. First experimental results will be shown and our experience with the new facility will be discussed.