Determination of damage thresholds to prevent side effects in laser cleaning of pliocene sandstone of Siena |
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| Institution: | 1. Max Planck-Weizmann Center for Integrative Archeology and Anthropology, Weizmann Institute of Science, Rehovot 76100, Israel;2. Department of Structural Biology and the Kimmel Center for Archeological Sciences, Weizmann Institute of Science, Rehovot 76100, Israel;3. Israel Antiquities Authority, POB 586, Jerusalem 91004, Israel;4. D-REAMS Radiocarbon Laboratory, Weizmann Institute of Science, Rehovot 76100, Israel |
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| Abstract: | The present work reports a basic investigation aimed at optimizing laser cleaning interventions on pliocene sandstone of Siena. Irradiation trials were performed with a short free running Nd:YAG laser, on quarry samples and on samples from Palazzo Spannocchi presenting black crust. The physical parameterization associated with a detailed petrographic and mineralogic diagnostics of the induced effects, allowed the irradiation thresholds for damage phenomena to be derived and their nature understood. The experimental results reported here allow the definition of the best irradiation conditions and the laser parameter ranges for a safe and controlled black crust removal from pliocene sandstone. |
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