Articolele autorului Costel Rizescu
Link la profilul stiintific al lui Costel Rizescu

CT – A perspective non-destructive method for investigation of metalwork
Non-destructive evaluation of archaeological and work of art objects by using computerized tomography
Graphic environment for industrial computerized tomography
An object oriented modeling system for interaction simulation in 3D industrial tomography
Some aspects concerning the 2D and 3D computerized tomography applied in non-destructive testing

The computerized industrial tomography is one of the NDT methods entirely based on the computer reconstruction technique that offers very detailed 2D and 3D graphic images of the tested object. After a brief description of a simple laboratory tomograph, some important features of the software package, specially developed for tomographic analysis, have been presented. Some relevant 2D and 3D tomograms as well as some considerations regarding the material

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Dual energy gamma-ray axial computer tomography investigation of some metamorphic and sedimentary rocks

Four specimens of metamorphic and sedimentary rocks were investigated using 192-Iridium dual energy gamma-ray computer tomography. Using this methodology, tomographs, depicting density as well as effective atomic number distribution with a 0.3 mm resolution, were obtained. Various details were evidenced including the granular structure of augen gneiss, the well-developed foliation pattern of mica rich gneiss, the banded configuration of nummulitic

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X and Gamma – Ray CAT Investigation of Fungia fungites L. (Cnidaria, Scleractinia) Coral Skeleton

A comparative investigation of the same specimen of scleractinian Fungia fungites L. coral skeleton performed by means of both X-and Gamma-ray computer axial tomographyhas revealed several features such as annual growth rings, gastro-vascular cavity or sclerosepta to sixths order and more. The apparent thickness of sclerosepta varied between 0.1 and 0.19 mm while the number of growth rings allows us to estimate the average annual growth ratio to

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Complex analysis of the “Cannon of Giurgiu” by Computerized Tomography with 192-Ir

The historical piece of artillery "Cannon of Giurgiu" is investigated by computed tomography and X-ray diffraction methods. 30 cross sections transversal to the cannon axis, spaced at 5-20 mm, are analysed by dual-energy CT method with 192-Ir radioisotope. Samples of corrosion material from the cannon pipe are tested by X-ray diffraction method. Numerous casting defects, large internal defects grown during cannon use, as well as severe corrosion

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High density mineral inclusions in rocks evidenced by Gamma-ray tomodensitometry

A fragment of a polysulfide rock containing quartz and high density mineral inclusions has been investigated by using a 192-Iridium Gamma-ray dual computer tomograph. The tomographic image revealed the existence of three different mineral fractions, whose densities and effective atomic numbers, as calculated by means of the image histograms, were equal to 2.57 +/- 0.24 g/cm3 (Zeff = 11.6 +/- 2.1), 4.01 +/- 0.22 g/cm3 (Zeff = 25.1 +/- 2.1), and 6.01

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3-D dual gamma-ray computer axial tomography investigation of polymetallic nodules

Polymetallic nodules (PN) collected from the north-east Pacific Clarion-Clipperton region were investigated with a 192-Iridium dual-energy gamma-ray computer tomograph. Tomographic images depicting density and effective atomic number distribution of the same section were obtained. These images present a linear response for a broad range of sample densities (0.97 - 6.22 g/cm3), and likewise effective atomic numbers (5.48 - 29). Sixty-five successive

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