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Abstract:
Ancient metal objects react with moisture and environmental chemicals to form various corrosion products. Because of the unique character and high value of such objects, any cleaning procedure should guarantee minimum destructiveness. The most common treatment used is mechanical stripping, in which it is difficult to avoid surface damage when employed. Lasers are currently being tested for a wide range of conservation applications. Since they are highly controllable and can be selectively applied, lasers can be used to achieve more effective and safer cleaning of archaeological artifacts and protect their surface details. The basic criterion that motivated us to use lasers to clean Roman coins was the requirement of pulsed emission, in order to minimize heat-induced damages. In fact, the laser interaction with the coins has to be short enough, to produce a fast removal of the encrustation, avoiding heat conduction into the substrate. The cleaning effects of three lasers operating at different wavelengths, namely a TEA CO2 laser emitting at 10.6 mum, an Er:YAG laser at 2.94 mum, and a 2omega-Nd:YAG laser at 532 nm have been compared on corroded Romans coins and various atomic and nuclear techniques have also been applied to evaluate the efficiency of the applied procedure.
| Reprints: | DRAKAKI E,NATL TECH UNIV ATHENS,DEPT PHYS;ZOGRAFOU CAMPUS; ATHENS 15780, GREECE.
edrakaki@central.ntua.gr | | Research
Institutions: | Natl Tech Univ Athens, Dept Phys, Athens 15780, Greece.
NCSR Demokritos, Inst Nucl Phys, Tandem Accelerator Lab, Lab Mat Anal, GR-15310 Athens, Greece. | | Discipline: | APPLIED PHYSICS/CONDENSED MATTER/MATERIALS SCIENCE 
SEMICONDUCTORS SOLID STATE MATERIALS TECHNOLOGY
| | CC Editions / Collections: | Physical, Chemical Earth Sciences (PCES);
Electronics Telecommunications Collection (EC) | | Language: | English | | Document type: | Article | | IDS No.: | 839EL | | Publisher: | SPRINGER, 233 SPRING STREET, NEW YORK, NY 10013 USA, http://www.springer-ny.com |
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