By Rene Van Grieken, Koen Janssens

This ebook in most cases includes contributions by way of the invited academics on the seventh foreign convention on Non-Destructive checking out and Micro-Analysis for the Diagnostics and Conservation of the Cultural and Environmental historical past. The individuals have all been selected for his or her person reputations and the standard in their examine, but additionally simply because they characterize a box deemed hugely very important. consequently, this booklet supply balanced assurance of the parts which are so much suitable in non-destructive checking out and micro-analysis within the realm of cultural background. The research equipment give you the scientific composition of cultural artifacts to explain their provenance, the speed of alteration due to publicity to the surroundings and the effectiveness of conservation and recovery options. The suggestions are in part or totally non-destructive, are moveable, or enable examine of other elements of a heterogeneous murals.

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4 Interpretation of grey values A series of glasses with different compositions was measured to determine the range of grey values for non-corroded glass. As expected, the strongest attenuation was observed for glasses containing lead. Bulk material of “SiO2 ”, prepared by the sol-gel process, was resolved as a compound with very weak attenuation. All other glasses yielded values between those two extremes. 1 Selected results Figure 8 shows an mCT image of a model glass for which the characterization by SEM is presented in Figure 6.

The second approach consists of sampling the artefact before analysis. Care has to be taken to limit the damage as much as possible, while the sample on the other hand has to be representative. Moreover, during the sampling procedure, transport to the laboratory and, if necessary, sample preparation contamination has to be avoided. Among the analytical techniques that require sampling, distinction can be made depending on whether the sample is destroyed (‘consumed’) during the analysis or not. In this work micro-samples are used and two sensitive analytical methods are applied that provide complementary information.

By using the TXRF key elements, it was possible to identify most inorganic pigments. However, in some cases micro-Raman spectroscopy had to complete the investigation, for instance to differentiate between red lead (Pb3 O4 ), massicot (PbO, orthorombic) and litharge (PbO, tetragonal) or to discriminate between several green copper containing pigments. On the other hand, TXRF could provide quantitative information on the relative amounts of elements (main elements as well as impurities) that were present in the samples.

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