Estimation of calcified tissues hardness via calcium and magnesium ionic to atomic line intensity ratio in laser induced breakdown spectra
Anno: 2007
Autori: Abdel-Salam Z.A., Galmed A.H., Tognoni E., Harith M.A.
Affiliazione autori: Cairo Univ, NILES, Giza, Egypt;
IPCF CNR, Appl Laser Spectroscopy Lab, Pisa, Italy
Abstract: Calcified tissues representing three different matrices, namely enamel of human teeth, shells and eggshell, have been studied via Laser Induced Breakdown Spectroscopy (LIBS) technique. The experimental CaII/CaI and MgII/MgI ratios have been measured, in view of the expected Correlation between the extent of ionization caused by the laser induced shock wave (SW) and the hardness of the target. The ratio CaII/CaI between the ionic calcium line at 373.69 nm and the neutral line at 428.9 nm is obtained for enamel, shells and eggshell spectra, as well as the ratio MgII/MgI between the ionic magnesium line at 280.26 nm and the neutral line at 285.22 nm. The results show that such spectral lines intensities ratio differs for different matrices and is indeed related to the target materials hardness. It is also found that the MgII/MgI ratio is preferable as an indicator of hardness since these lines are less affected by self absorption. The SW front speed has been measured in the three cases and the obtained values confirm the proportionality to the target hardness. The results here obtained suggest the feasibility of the quantitative estimation of hardness for any other calcified tissues. (C) 2007 Elsevier B.V. All rights reserved.
Giornale/Rivista: SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
Volume: 62 (12) Da Pagina: 1343 A: 1347
Parole chiavi: LIBSDOI: 10.1016/j.sab.2007.10.033Citazioni: 95dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-04-14Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui