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| Format: | Artículo científico |
| Language: | en |
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Sociedade Brasileira de Física
2004
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| Online Access: | https://www.redalyc.org/articulo.oa?id=46434585 |
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Table of Contents:
- Analysis of Concrete Material through Gamma Ray Computerized Tomography J. M. de Oliveira A. C. G. Martins J. A. De Milito Física, Astronomía y Matemáticas Computerized Tomography (CT) refers to the cross sectional imaging of an object from both transmissionor reflection data collected by illuminating the object from many different directions. The most importantcontribution of CT is to greatly improve abilities to distinguish regions with different gamma ray transmittanceand to separate over-lying structures. The mathematical problem of the CT imaging is that of estimating animage from its projections. These projections can represent, for example, the linear attenuation coefficient of°-rays along the path of the ray. In this work we will present some new results obtained by using tomographictechniques to analyze column samples of concrete to check the distribution of various materials and structuralproblems. These concrete samples were made using different proportions of stone, sand and cement. Anotherset of samples with different proportions of sand and cement were also used to verify the outcome from theCT analysis and the differences between them. Those samples were prepared at the Material Laboratory ofFaculdade de Engenharia de Sorocaba, following the same procedures used in real case of concrete tests. Theprojections used in this work was obtained by Mini Computerized Tomograph of Uniso (MTCU), located at theExperimental Nuclear Physics Laboratory at University of Sorocaba. This tomograph operates with a gammaray source of 241Am (photons of 60 keV and 100 mCi of intensity) and a NaI(Tl) solid state detector. Thesystem features translation and rotation scanning modes, a 100 mm effective field of view, and 1 mm spatialresolution. The image reconstruction problem is solved using Discrete Filtered Backprojection (FBP). 2004 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46434585 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3A Vol.34