A comparative and critical study of X-ray CT and neutron CT as non-destructive material evaluation techniques
Published:January 01, 2007
J. Vlassenbroeck, V. Cnudde, B. Masschaele, M. Dierick, L. van Hoorebeke, P. Jacobs, 2007. "A comparative and critical study of X-ray CT and neutron CT as non-destructive material evaluation techniques", Building Stone Decay: From Diagnosis to Conservation, R. Přikryl, B. J. Smith
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X-ray computerized tomography (CT) has traditionally been used as a medical diagnostic tool. This non-destructive technique has developed as an important research tool for a wide variety of scientific subjects. For material research ‘medical’ CT, microCT and, very recently, nano- or submicroCT have been used as non-destructive material evaluation techniques for engineering and geological purposes. The fact that X-ray CT visualizes the internal structure of natural building stones and yields information on porosity values and pore-size distributions is a major advantage for the study of their conservation. The penetration of fluids like water, consolidants or water repellents inside porous materials is important when dealing with conservation and restoration research. Recently, high-speed neutron tomography has been introduced as a visualization technique for fluids inside porous materials. High-speed neutron tomography can be used as a complementary technique to X-ray tomography as elements like hydrogen, which have a weak attenuation for X-rays, are easy to detect using neutrons. In this paper the basic principles of computerized tomography and more specifically X-ray and neutron tomography are discussed. In addition, application possibilities, advantages and limitations of medical CT, X-ray microCT and high-speed thermal neutron CT are outlined.
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Building Stone Decay: From Diagnosis to Conservation
Stone buildings and monuments from the cultural centres of many of the world's urban areas. Frequently these areas are prone to high levels of atmospheric pollution that promote a variety of aggressive stone decay processes. Because of this, stone decay is now widely recognized as a severe threat to much of our cultural heritage. If this threat is to be successfully addressed it is essential that the symptoms of decay are clearly identified, that appropriate stone properties are accurately characterized and that decay processes are precisely identified. It is undoubtedly the case that successful conservation has to be underpinned by a comprehensive understanding of the causes of decay and the factors that control them. The accomplishment of these demanding goals requires an interdisciplinary approach based on co-operation between geologists, environmental scientists, chemists, material scientists, civil engineers, restorers and architects. In pursuit of this collaboration, this volume aims to strengthen the knowledge base dealing with the causes, consequences, prevention and solution of stone decay problems.