The present work has the purpose to evaluate experimentally the ablation threshold fluences of copper, silver and their alloys in order to induce a safety laser cleaning of the metal artifacts avoiding damages to the bulk. We used two different pulsed lasers: a KrF excimer laser operating at 248 nm, 23 ns pulse duration and a Nd:YAG laser operating at 532 nm (second harmonic), 3 ns pulse. Preliminary experimental results about the laser cleaning of bronze coins will be report. The laser cleaning consists on the reduction of the chlorine concentration from the surface of the coins. The laser cleaning, carried out by the KrF laser, provides a safety removing of the chlorine concentration as the Energy Dispersive X-Ray Fluorescence analyses will be demonstrate.

Laser ablation threshold of cultural heritage metals

LORUSSO, ANTONELLA;NASSISI, Vincenzo;BUCCOLIERI, ALESSANDRO;BUCCOLIERI, Giovanni;CASTELLANO, Alfredo;LEO, LAURA SANDRA;DI GIULIO, Massimo;
2008-01-01

Abstract

The present work has the purpose to evaluate experimentally the ablation threshold fluences of copper, silver and their alloys in order to induce a safety laser cleaning of the metal artifacts avoiding damages to the bulk. We used two different pulsed lasers: a KrF excimer laser operating at 248 nm, 23 ns pulse duration and a Nd:YAG laser operating at 532 nm (second harmonic), 3 ns pulse. Preliminary experimental results about the laser cleaning of bronze coins will be report. The laser cleaning consists on the reduction of the chlorine concentration from the surface of the coins. The laser cleaning, carried out by the KrF laser, provides a safety removing of the chlorine concentration as the Energy Dispersive X-Ray Fluorescence analyses will be demonstrate.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11587/324550
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