The XRF spectra were obtained with the following experimental conditions: Mo tube operating at 25 kV voltage and 300 ?A beam current; scan time 120 s; distance 95 mm.
Regarding wood samples, thin sections were obtained according to the anatomic wood directions and described following the IAWA list of microscopic features for hardwood and softwood identification [12, 13]. Thin sections of the wood sample were examined under a Polyvar 100 optical microscope equipped with per PIXeLINK digital corpo legislativo.
Temperature (T) and divisee humidity (RH) values have been recorded through a digital datazione logger Elenco 177-H1 model. The data logger has been calibrated and hanged on the northern wall of presbytery. Tempo have been recorded from 26 of July onesto 8 of September and then elaborated by Excel software preciso obtain maximum, minimum, average values and norma deviation throughout the analysed period.