Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Novel Neutron Imaging Techniques for Cultural Heritage Objects
Abstract The use of neutrons for cultural heritage (CH) research is illustrated with special reference to neutron tomography (NT) methods, providing three-dimensional (3D) images of neutron attenuation, and the analysis techniques known as prompt gamma-ray activation analysis (PGAA) and neutron resonance capture analysis (NRCA), providing the elemental composition of an object. PGAA and NRCA are well-established nondestructive methods for bulk analysis of CH objects, with sensitivities that can reach the parts-per-million range. By improving the spatial resolution of PGAA and NRCA it will be possible to measure the composition of small parts inside a large object or even to provide a full 3D map of the elemental composition of an artifact. The imaging techniques under development are called prompt gamma-ray activation imaging (PGAI), neutron resonance capture imaging (NRCI) and neutron resonance transmission (NRT) tomography. The NRCA experience at the GELINA neutron source is the starting point for the development of NRCI/NRT now taking place at the 100 times more powerful ISIS pulsed neutron source. PGAI, NRCI, and NRT are unlikely to achieve the spatial resolution obtained by conventional NT. It is the combined use of these new imaging techniques with neutron and X-ray tomographies that is proposed here as the way forward in neutron imaging. There are parallel developments in the use of Bragg edges to improve the elemental sensitivity of NT (dichromatic tomography). Another foreseen development is 3D phase imaging (neutron diffraction imaging, NDI), which can essentially be undertaken using existing diffraction instruments. The ongoing developments are promising and suggest that neutron-based techniques will provide the basis for integrated analysis protocols leading to important advances in the scientific characterization of the materials that constitute a CH object.
Novel Neutron Imaging Techniques for Cultural Heritage Objects
Abstract The use of neutrons for cultural heritage (CH) research is illustrated with special reference to neutron tomography (NT) methods, providing three-dimensional (3D) images of neutron attenuation, and the analysis techniques known as prompt gamma-ray activation analysis (PGAA) and neutron resonance capture analysis (NRCA), providing the elemental composition of an object. PGAA and NRCA are well-established nondestructive methods for bulk analysis of CH objects, with sensitivities that can reach the parts-per-million range. By improving the spatial resolution of PGAA and NRCA it will be possible to measure the composition of small parts inside a large object or even to provide a full 3D map of the elemental composition of an artifact. The imaging techniques under development are called prompt gamma-ray activation imaging (PGAI), neutron resonance capture imaging (NRCI) and neutron resonance transmission (NRT) tomography. The NRCA experience at the GELINA neutron source is the starting point for the development of NRCI/NRT now taking place at the 100 times more powerful ISIS pulsed neutron source. PGAI, NRCI, and NRT are unlikely to achieve the spatial resolution obtained by conventional NT. It is the combined use of these new imaging techniques with neutron and X-ray tomographies that is proposed here as the way forward in neutron imaging. There are parallel developments in the use of Bragg edges to improve the elemental sensitivity of NT (dichromatic tomography). Another foreseen development is 3D phase imaging (neutron diffraction imaging, NDI), which can essentially be undertaken using existing diffraction instruments. The ongoing developments are promising and suggest that neutron-based techniques will provide the basis for integrated analysis protocols leading to important advances in the scientific characterization of the materials that constitute a CH object.
Novel Neutron Imaging Techniques for Cultural Heritage Objects
Andreani, C. (Autor:in) / Gorini, G. (Autor:in) / Materna, T. (Autor:in)
01.01.2009
24 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
X-ray and neutron scattering , Neutron diffraction , Neutron imaging , Ancient Roman marbles , Textures , Experimental methods of materials testing and analysis Material Science , Biomedical Engineering , Imaging / Radiology , Condensed Matter , Continuum Mechanics and Mechanics of Materials , Characterization and Evaluation of Materials
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