TY - CONF A1 - Osterloh, Kurt A1 - Nusser, A. T1 - X-ray and neutron radiological methods to support the conservation of wooden artworks soaked with a polluting impregnant 'carbolineum' T2 - ECNDT 2014 - 11th European conference on non-destructive testing (Proceedings) N2 - Wooden artworks residing in churches for centuries inevitably suffered from decaying processes such as Wood worm infestation. About 100 years ago, this process was ceased with a polluting coal tar extract 'Carbolineum', a treatment usually applied to railway sleepers. Nowadays, this lead to undesired effects not only of causing dark stains on the surface of the treated sculptures but also in unimpaired release of traces of harmful substances into the atmosphere perceptible as the typical smell of coal tar oil. To resolve this problem, the knowledge of the internal structure could provide a support for this effort. As an example, sculptures from an epitaph in a church in northern Germany were subjected to X-ray and neutron computed tomography (CT). The purpose of using neutrons was to get information about the distribution of the impregnant Carbolineum. It consists of a mixture of polycyclic aromatic hydrocarbons which should increase the absorption of neutrons. In contrast, X-rays are rather poorly absorbed by such substances as compared to the wood matrix. All radiographic approaches revealed traces of previous conservation measures that were not always documented in detail. Comparing the neutron images with those from the X-ray interrogation some differences became obvious indicating varied material compositions. Nails e.g. were clearly visible in the X-ray images rather than in the neutron ones. Some less visibly stained parts of the sculptures correspond with obviously replaced materials in the inside. These results will be used to identify ways how to treat the infested artworks. T2 - ECNDT 2014 - 11th European conference on non-destructive testing CY - Prague, Czech Republic DA - 2014-10-06 KW - Radiographic testing (RT) KW - Computed tomography (CT) KW - Cultural heritage KW - Radiological methods KW - Carbolineum KW - Wooden artworks KW - Neutron-CT KW - X-ray CT KW - Neutron radiology PY - 2014 UR - http://www.ndt.net/events/ECNDT2014/app/content/Paper/155_Osterloh.pdf SN - 978-80-214-5018-9 SP - 1 EP - 8 AN - OPUS4-32304 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Osterloh, Kurt A1 - Bellon, Carsten A1 - Hohendorf, Stefan A1 - Kolkoori, Sanjeevareddy A1 - Wrobel, Norma A1 - Nusser, A. A1 - Freitag, M. A1 - Bücherl, T. A1 - Bar, D. A1 - Mor, I. A1 - Tamin, N. A1 - Weiss-Babai, R. A1 - Bromberger, B. A1 - Dangendorf, V. A1 - Tittelmeier, K. T1 - Computed tomography with X-rays and fast neutrons for restoration of wooden artwork JF - Physics Procedia N2 - The objects of this investigation were sculptures taken from a ca. three hundred years old baroque epitaph of a church in Tonning, a town in Northern Germany. Around 1900 it was found in a disastrous state heavily damaged by wood-worm. At that time, the whole artwork was treated with the tar extract carbolineum as a remedy. Nowadays, this substance has been identified as carcinogenic, and its presence can be perceived by its stench and visually at certain spots on the surface where it has penetrated the covering paint. A gold-painted sculpture of a massive wooden skull was interrogated with X-rays and fast neutrons to investigate the internal distribution of the carbolineum. The X-ray tomography, with its excellent spatial resolution revealed galleries left over from the worm infestation in the outer areas and cracks in the central region. The golden color coating appeared as a thick and dense layer. In comparison the tomography with fast neutrons, though being of lower resolution and yet unresolved artefacts revealed sections of slightly different densities in the bulk of the wood. These differences we attribute to the differences in the distribution of the impregnant in the wood, visible due to its higher hydrogen content making it less transparent for neutrons. T2 - WCNR-10 - 10th World conference on neutron radiography CY - Grindelwald, Switzerland DA - 05.10.2014 KW - Computed tomography KW - Neutron radiology KW - Conservation of wooden artwork PY - 2015 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-323050 DO - https://doi.org/10.1016/j.phpro.2015.07.066 SN - 1875-3892 VL - 69 SP - 472 EP - 477 PB - Elsevier B.V. CY - Amsterdam AN - OPUS4-32305 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -