Colour Specification of Terracotta Calatina Specimens

Analisi Quantitativa su miscele di pigmenti tramite XRF

Caratterizzazione di pigmenti storici singoli e in miscela

Phenol compounds as new materials for Electron Spin Resonance (ESR) dosimetry in clinical photon and electron beams

In the last decades several research laboratories have shown an increasing interest aimed at extending the applicability of Electron Spin Resonance (ESR) dosimetry to radiotherapy with different types of radiation beams. ESR is a spectroscopic method for investigating the structure and dynamics of such paramagnetic species. Free radicals are known to be produced when a compound is irradiated with ionizing radiations. The concentration of radiation-induced free radicals is proportional to the energy released inside in the medium and this allows for dosimetric measurements through ESR technique which able to quantitatively determine the radical concentration.The use of alanine as a dosimetric…

Applicazione Integrata di Tecniche Analitiche per la Caratterizzazione di Pigmenti Storici

La Colorimetria nei programmi di Conservazione e Restauro: il ruolo della Spettroradiometria

Nanostructured products applications for the conservation of Cultural Heritage samples

Qualitative and quantitative characterization of historical pigment mixtures through non-invasive techniques

Historical Building Dating: The Multidisciplinary Study of the Convento de São Francisco (Coimbra, Portugal)

Historical buildings: luminescence dating of fine grains from bricks and mortar

In the framework of a research program aimed to define the chronology of the structures of the architectonic complex of San Francesco alla Collina (Paternò, Italy), two luminescence dating techniques were applied: Thermoluminescence (TL) on terracotta bricks and Optically Stimulated Luminescence (OSL) on mortars. Dating a historic building through the age of its bricks can be sometimes complex, for the possible gap between the age of the bricks themselves and that of the structure. Considering that the laying of mortar is contemporary to the construction, the principal objective of the work here presented is the verification of the possibility of solving chronological uncertainties of speci…

Datazione di malte storiche tramite OSL

L'applicazione della termoluminescenza (TL) alla terracotta, utilizzata come materiale da costruzione negli edifici storici, permette di risalire all'epoca di manifattura della stessa. Questo istante potrebbe, però, non coincidere con la data della fabbrica. Assume, a tal fine, un'importanza fondamentale la possibilità di datare le malte prelevate dalla struttura in esame la cui posa è, infatti, coincidente con l'edificazione. In questa occazione viene presentato il protocollo di misura messo a punto per la preparazione fisico-chimica dei campioni di malta da sottoporre a misure di datazione mediante Luminescenza Otticamente Stimolata (OSL) attraverso la presentazione dei risultati ottenuti…

Historical mortar: luminescence from fine grain quartz

Within the framework of a research programme aimed at the chronological reconstruction of the structures belonging to the architectonic complex of San Francesco alla Collina of Paternò (Catania, Italy), a procedure was carried out using thermoluminescence (TL) and optically stimulated luminescence (OSL) dating, respectively on terracotta bricks and mortar from the same sampling points. The primary methodological aim was to extend the application of luminescence dating techniques to mortar from historical buildings. Because the TL dating method dates the last firing of bricks, it offers a terminus post quem: the results give the period in which they were manufactured. The possibility that th…

Interconfronto di datazione TL ed OSL su terracotta

Nell'ambito di uno specifico programma di datazione tramite luminescenza stimolata termicamente (TL) e otticamente (OSL) campioni di terracotta sono stati preparati e misurati con diverse tecniche allo scopo di minimizzare l'errore sull'età ottenuta. I valori di dose equivalente sono stati ottenuti, su aliquote preparate utilizzando il protocollo standard fine grain (4-11 micron), con la tecnica della doppia Single Aliquot Regeneration AR (d-SAR) nel caso dei segnali OSL. I risultati ottenuti verranno confrontati con le età OSL ottenute di quarzo di granulometria maggiore (90-150 micron).

Historical building dating: refinement of established sample preparation protocol

Abstract: The application of thermal (TL) and optical (OSL) stimulated luminescence on pottery and building materials has allowed to resolve numer-ous problems in both the fields of retrospective do-simetry and dating. Routine measurements request the registration of TL signals obtained on polymineral fine-grained frac-tion (FG) extracted from pottery sherds and bricks used as building material with the Added Dose (AD) technique. One of the reasons of the dispersion of the lumi-nescence measurements when using this fraction is the variability of relative contents of quartz and feld-spars, which due to their differing behaviour influ-encing the equivalent dose (ED) and therefore its uncertai…