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  Comparison of portable XRF and ICP-OES for air filter samples
  Scientists at the National Institute for Occupational Safety and Health (NIOSH), have performed research testing the ability of Thermo Scientific NITON handheld XRF analyzers for the measurement of lead in air filter samples, compared to the standard digestion and analysis by ICP emission spectrometry.

They found that the handheld devices produced comparable results, within +/- 25% of the ICP analytical results.

See http://www.rsc.org/publishing/journals/EM/article.asp?doi=b518075a to purchase the full paper or view the abstract of the paper, which pupblished in the Royal Society of Chemistry's Journal of Environmental Monitoring.

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See http://www.thermo.com/niton for further details on handheld XRF products

See http://www.thermo.com/icap for further details on ICP emission spectrometry products.