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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Scientific report. Large-area X-ray scan of a mosaic with high resolution
 Vopálenský, Michal
The aim of the research is to make an X-ray scan of a mosaic, which thanks to a high resolution could reveal structural details in the mosaik construction, as armature, cracks etc. The investigated object as a mosaic of St. Family from the Liberec region. The size of the mosaic is 1200 x 700 x 30 mm and its weight is about 50 kg. The mosaic itself is mounted into a metal frame. The substrate of the tesserae is a cement-based material.
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Optimization of acquisition parameters in radiography and tomography
 Vopálenský, Michal ; Vavřík, Daniel ; Kumpová, Ivana
Contrast in radiographic images is one of the most important parameters both in radiography and tomography. This paper investigates the possibility of adjusting the radiographic parameters, in particular the accelerating voltage of the X-ray tube, in order to maximize the difference in the detected intensity in response to the change in the thickness of the investigated object. Simplified model is used that allows finding the optimal operating point for the given material and thickness without an apriory knowledge about the X-ray spectra, detector response and the material composition. It is shown that in case of small changes of thickness, the optimum is met when the detected intensity behind the object of certain thickness is at approx. 37 % of the full range (i.e., of the value that would be measured under the same conditions in the absence of the object). In spite of simplifications made, the theoretical model shows a very good correspondence with the experimental data. A brief consideration is made on the case of a general difference in thicknesses.
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