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摘要
The possibility to define a two-way relationship between age and a spectral property of ancient flax textiles has been investigated in the present paper employing both FT-IR and Raman analyses on selected samples dated from about 3250 B.C. to 2000 A.D. %26lt;br%26gt;After a first selection to eliminate polluted samples, based on visual inspection, on proper mechanical tests and on a first glance at the resulting spectra, eleven samples of the original 14 have been used for Raman analysis and eight for FT-IR analysis. %26lt;br%26gt;For the first time, the possibility to define a correlation among spectral properties and age of flax samples, by using calibration curves, has been proved. %26lt;br%26gt;In agreement with the kinetics theoretical model, the experimental relationships are of an exponential type, giving correlation coefficients higher than 0.9. The better results Were obtained using FT-IR because Raman analysis needs to consider an additional variable due to the non negligible influence of fluorescence. %26lt;br%26gt;Presently, the method allows to assign an uncertainty of centuries to the measured data, but future calibrations based on a greater number of samples (though it is not easy to find ancient samples adequate for the test) and coupled with ad hoc cleaning procedures could significantly improve its accuracy.
- 出版日期2013-7
