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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
