Talks and Poster Presentations (with Proceedings-Entry):
C. Horntrich, F. Meirer, C. Streli, P. Kregsamer, G. Pepponi, N. Zöger, P. Wobrauschek:
"Influence of the sample morphology on total reflection X-ray fluorescence analysis";
Talk: Denver X-Ray Conference,
Colorado Springs, USA;
- 2008-08-08; in: "Proceedings of the 57th Annual Conference on Applications of X-ray Analysis (Denver X-ray Conference) and the 8th International Conference on Residual Stresses (ICRS-8)",
International Centre for Diffraction Data,
Total Reflection X-ray Fluorescence Analysis (TXRF) is a method for qualitative and quantitative analysis of trace elements. In general TXRF is known to allow for linear calibration typically using an internal standard for quantification. For small sample amounts (low ng region) the thin film approximation is valid neglecting absorption effects of the exciting and the detected radiation. However, for higher total amounts of samples deviations from the linear relation between fluorescence intensity and sample amount have been observed. The topic of the presented work is an investigation of the parameters influencing the absorption phenomenon. Samples with different total amounts of arsenic have been prepared to determine the upper limit of sample mass where the linear relation between fluorescence intensity and sample amount is no longer guaranteed. It was found that the relation between fluorescence intensity and sample amount is linear up to ~100 ng arsenic. A simulation model was developed to calculate the influence of the absorption effects. Even though the results of the simulations are not satisfying yet it could be shown that one of the key parameters for the absorption effect is the density of the investigated element in the dried residues.
Electronic version of the publication:
Created from the Publication Database of the Vienna University of Technology.