Time-Resolved Laser-Induced Fluorescence of Asbestos in Visible Region

概要

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Nanosecond time-resolved laser-induced fluorescence spectroscopy was performed on five types of asbestos (chrysotile, crocidolite, amosite, tremolite, and anthophyllite) using an ultraviolet laser pulse of 266 nm. Most of the fluorescence spectra had a broad wavelength band of 350–700 nm and a maximum at approximately 450 nm in the visible region. The spectra also varied in shape over time. Although all the spectra were similar in shape, a significant difference in the relative ratio of fluorescence intensity between the two different wavelength regions was identified. The lifetime and total fluorescence intensity were also investigated and differences were observed for the different types of asbestos. The observed fluorescence decay curves of the different types of asbestos were almost biexponential in form. The total fluorescence intensity for anthophyllite was the largest among the five types of asbestos. Several methods potentially useful for identifying asbestos from other materials on the basis of their fluorescence characteristics are discussed.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2009-04-25