DMCA
DEGRADATION PHENOMENA ON HISTORIC GLASS: NON-DESTRUCTIVE CHARACTERIZATION BY SYNCHROTRON RADIATION
BibTeX
@MISC{Roemich_degradationphenomena,
author = {Hannelore Roemich and Franco Zanini and Katrin Wittstadt and Carola Mueller Weinitschke and Nicola Sodini and Syrmep Group and Sincrotrone Trieste},
title = {DEGRADATION PHENOMENA ON HISTORIC GLASS: NON-DESTRUCTIVE CHARACTERIZATION BY SYNCHROTRON RADIATION},
year = {}
}
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Abstract
Depending on their composition and the exposure environment, historic glasses develop degradation phenomena, ranging from thin hydrated surface layers up to complete cracking all through the sample. Characterizing the degradation pattern is important to select the most adequate conservation strategy. Optical microscopy is the most frequently used non-destructive analysis methods to examine the surface of historic glass. Scanning electron microscopy (SEM) is applied to investigate the depth of damaged areas, although this requires the glass to be prepared as embedded cross sections and is thus limited to sacrificial samples. Computed X-ray tomography (CT) was adopted for detecting degradation layers on archaeological glasses by using a desktop tomography scanner. Limitations were encountered when the treatment of degraded glasses with organic polymers needed to be evaluated. The highly coherent X-ray beam available at the SYRMEP bending magnet beamline at ELETTRA offers the possibility to investigate glasses by phase sensitive (PS) micro-tomography. Historic glasses from archaeological context and samples taken from naturally weathered stained glass windows were examined during a measurement campaign in 2007. The results demonstrate the potential of phase sensitive micro-CT to illustrate not only the corrosion patterns of glasses but also the conservation treatments. In one prominent example the consolidation of a cracked archaeological sample with Paraloid B72 could be followed. The visualization of the 3D-structure of fragile objects can be used to optimize conservation treatments.
Keyphrases
degradation phenomenon historic glass non-destructive characterization synchrotron radiation historic glass conservation treatment phase sensitive micro-ct exposure environment stained glass window cracked archaeological sample archaeological glass electron microscopy syrmep bending magnet beamline sacrificial sample coherent x-ray beam optical microscopy degradation layer degradation phenomenon corrosion pattern x-ray tomography embedded cross section archaeological context fragile object degraded glass measurement campaign paraloid b72 degradation pattern non-destructive analysis method desktop tomography scanner adequate conservation strategy organic polymer prominent example
