IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
artículos
Título:
TXRF analysis using polycapillaries. A comparison with conventional setups
Autor/es:
H. J. SÁNCHEZ; DR. ROBERTO DANIEL PÉREZ; MARÍA LUISA CARVALHO; M. RUBIO
Revista:
NUCLEAR INSTRUMENTS AND METHODS IN PHYSICS RESEARCH B - BEAM INTERACTIONS WITH MATERIALS AND ATOMS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2010 vol. B268 p. 3478 - 3481
ISSN:
0168-583X
Resumen:
The possibility of producing parallel X-ray beams with low divergence by means of half monolithic polycapillaries
gives the impression to be useful in total reflection X-ray fluorescence (TXRF) experiments. On
one hand, the use of polycapillaries facilitates the alignment and the setup of the experiment. As
expected, the spectra registered in the experiment shown low background and good signalnoise ratio.
On the other hand, the intensity of photons on the samples when polycapillaries are employed is lower
than in other configurations, which produces a loss of efficiency for the excitation of the sample mainly
for light elements. In this work, different TXRF experiments were carried out and the minimum detection
limits attained were compared with the ones obtained from TXRF using polycapillaries. The results indicate
that the decrease of intensity produced by polycapillaries is imposing when detection limits are analyzed.
Nevertheless, detection limits are better than conventional XRF. The possibility of employing nonsymmetrical
polycapillaries could eventually improve the detection limits so as to be equivalent to the
conventional TXRF setups.