INVESTIGADORES
SANCHEZ Hector Jorge
artículos
Título:
SRXRF Analysis with Spatial Resolution of Dental Calculus
Autor/es:
H. J. SÁNCHEZ; C. A. PÉREZ; M.S. GRENÓN
Revista:
NUCLEAR INSTRUMENTS AND METHODS IN PHYSICS RESEARCH B - BEAM INTERACTIONS WITH MATERIALS AND ATOMS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2000 vol. B170 p. 211 - 217
ISSN:
0168-583X
Resumen:
This work presents elemental-composition studies of dental calculus by X-ray ¯uorescence analysis using synchrotron
radiation. The intrinsic characteristics of synchrotron light allow for a semi-quantitative analysis with spatial
resolution. The experiments were carried out in the high-vacuum station of the XRF beamline at the Synchrotron Light
National Laboratory (Campinas, Brazil). All the measurements were performed in conventional geometry
45° 45°
and the micro-collimation was attained via a pair of orthogonal slits mounted in the beamline. In this way, pixels of
50 lm 50 lm were obtained keeping a high ¯ux of photons on the sample.
Samples of human dental calculus were measured in dierent positions along their growing axis, in order to determine
variations of the compositions in the pattern of deposit. Intensity ratios of minor elements and traces were
obtained, and linear pro®les and surface distributions were determined.
As a general summary, we can conclude that lXRF experiments with spatial resolution on dental calculus are
feasible with simple collimation and adequate positioning systems, keeping a high ¯ux of photon. These results open
interesting perspectives for the future station of the line, devoted to lXRF, which will reach resolutions of the order of
10 lm. Ó 2000 Elsevier Science B.V. All rights reserved.