Proton microprobe determination of fluorine depth distributions and surface multielement characterization in dental enamel |
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Authors: | U Lindh Anne B Tveit |
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Institution: | (1) Department of Physical Biology, Gustaf Werner Institute, Uppsala, Sweden;(2) Department of Dental Research, School of Dentistry, University of Bergen, Bergen, Norway |
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Abstract: | Particle induced X-ray emission analysis (PIXE) and nuclear reaction analysis have been applied to multielemental analysis
of human dental enamel in a proton microprobe. The PIXE technique was excercised for the characterization of multielemental
lateral distributions on and just below the sample surface. For the assessment of depth distributions of fluorine the resonant
nuclear reaction19F(p,aλ)16O was used. The combination of two analytical techniques comprising both atomic and nuclear interactions in a microprobe was
applied to enamel samples of different origins. One sample constituted a healthy enamel and the other one enamel from a restored
tooth. The microprobe in the combined mode was demonstrated to permit the establishment of lateral, concentration gradients
of elements heavier than phosphorus with a resolution of 15 μm in enamel and simultaneously of depth distributions of fluorine
better than 0.7 μm. The detection limits approached, 10–25 ppm for most of the elements considered.
Supported by the Swedish Natural Science Research Council |
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