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Limits of detection of a total reflection x-ray fluorescence system with double reflection module

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Abstract

An X-ray tube with a Mo target and Zr filter, operated at 45 kV/20 mA, was used to excite samples (5 ΜL deposited on a quartz support) and the total reflection angle condition was obtained with a double reflector module built with two 10-cm-long 7-mm-thick quartz crystals placed 50 Μm apart. A high-resolution spectrometer based on a Si(Li) detector coupled to a multichannel analyzer was used for X-ray detection and the spectra were interpreted with the AXIL software.

The system was calibrated with standard chemical solutions containing Cr, Fe, Cu, Zn, and Pb, and Y was used as an internal standard to correct eventual geometric errors and high-voltage instabilities of the X-ray generator. The limits of detection were 19, 9, 5, and 4 ng/mL for Cr, Fe, Cu, and Zn, respectively, analyzed through characteristicKk α X-rays, and 7 ng/mL for Pb, throughLk α X-rays, considering 50 ΜL samples deposited and dried on a quartz support, to be excited/ detected for 1000 s.

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Authors and Affiliations

  1. Laboratŕio de InstrumentaÇÃo Muclear/CEMA/USP, au,Centenário 303, CP 96 CEP, 13400-970, Piracicaba SÃo Paulo, Brazil

    V. F. Nascimento Filho, P. S. Parreira, E. P. Espinoza & A. A. Navarro

  2. Departamento de Física e Meteorologia/ESALQ/USP, au, Pádua Dias, 11, CP 9, CEP, 13418-900, Piracicaba, SÃo Paulo, Brazil

    V. F. Nascimento Filho

  3. Laboratorio de Fluorescencia de Rayos X/CCHEN, Amunatequi, 95, Cassila, 188-D, Santiago, Chile

    V. H. Poblete

  4. Departamento de Física/CCE/UEL, Campus Universitário, CP 6001, CEP, 86051-970, Londrina, Paraná, Brazil

    P. S. Parreira

  5. Departamento de Recursos Hidricos/FEC/UNICAMP, Campus Uniuersitário, CP 6021, CEP, 13081-970, Campinas, SÃo Paulo, Brazil

    E. Matsumoto & S. M. Simabuco

Authors
  1. V. F. Nascimento Filho
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  2. V. H. Poblete
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  3. P. S. Parreira
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  4. E. Matsumoto
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  5. S. M. Simabuco
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  6. E. P. Espinoza
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  7. A. A. Navarro
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Nascimento Filho, V.F., Poblete, V.H., Parreira, P.S. et al. Limits of detection of a total reflection x-ray fluorescence system with double reflection module. Biol Trace Elem Res 71, 423–430 (1999). https://doi.org/10.1007/BF02784230

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  • DOI: https://doi.org/10.1007/BF02784230

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