INVESTIGADORES
SANCHEZ Hector Jorge
artículos
Título:
X-Ray Fluorescence Beamline at the LNLS: Current Instrumentation and Future Developments (abstract)
Autor/es:
C. A. PÉREZ; M. I. S. BUENO; H. J. SÁNCHEZ; H. TOLENTINO
Revista:
REVIEW OF SCIENTIFIC INSTRUMENTS
Editorial:
AMER INST PHYSICS
Referencias:
Lugar: New York; Año: 2002 vol. 73 p. 1563 - 1564
ISSN:
0034-6748
Resumen:
The x-ray fluorescence ~XRF! beamline, constructed at the Brazilian National Synchrotron
Radiation Laboratory ~LNLS-http://www.lnls.br!, has been operating for the external users since
August of 1998 ~C. A. Pe´rez et al., Proc. of the European Conference on Energy Dispersive X-Ray
Spectrometry, Bologna, Italy, 1998, pp. 125?129!. The synchrotron source for this beamline is the
D09B ~15°! dipole magnet of the LNLS storage ring. Two main experimental setups are mounted at
the XRF beamline. One consists of a high vacuum chamber adapted to carry out experiments in
grazing excitation conditions. This allows chemical trace and ultratrace element determination on
several samples, mainly coming from environmental and biological sciences. Another setup consists
of an experimental station, operated in air, in which x-ray fluorescence analysis with spatial
resolution can be done. This station is equipped with a fine conical capillary, capable of achieving
20 mm spatial resolution, and with an optical microscope in order to select the region of interest on
the sample surface. In this work, the main characteristic of the beamline, experimental stations as
well as the description of some new experimental facilities will be given. Future development in the
instrumentation focuses on an appropriate x-ray optic to be able to carry out chemical trace analysis
of light elements using the total x-ray fluorescence technique. Also, chemical mapping below 10 mm
spatial resolution, while keeping high flux of photon on the sample, will be achieved by using the
Kirkpatrick?Baez x-ray microfocusing optic. © 2002 American Institute of Physics.