Springer Online Journal Archives 1860-2000
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Abstract. Gamma-ray beams of which both the bandwidth and the energy can be tuned were used to perform tomographies. Samples containing heavy elements were rotated and translated in these beams, and the absorption of the beams for each position was measured. Different analysing methods were compared. In contrast to common tomography which uses a continuous spectrum, a technique relying on a monochromatic beam, and a second method which uses as signal the intensity ratio of two monochromatic beams passing through the sample, are presented. When the heavy element under study is present, with the second method the ratio becomes element sensitive if the two energies are such that one is just above and one just below the K-edge of the heavy element under study. An element-sensitive tomography is therefore possible. Different back-projection methods (iterative process, simple back-projection, convolution reconstruction method) were applied on the same data, and their results were compared.
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