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Interpretation on EDX spectrum result
March 16, 2009
Please help to explain what is the different between Weight% and Atomic% in the EDX spectrum analysis result. And is EDX is a qualitative analysis? why it cannot be quantitative analysis. thanks a lots from your help.
BC Loke- Malaysia
^- Privately contact this inquirer -^
March 19, 2009
Atomic % would be the % as a function of the number of atoms whereas wt % would be % as a function of weight.
EDX can be both qualitative and quantitative depending on whether you have standards.
Many times software has a "semi-quant" based on FP (fundamental parameters)
- Auburn, Washington
December 16, 2011
Which quantitative results is accurate and should be used, weight % or atomic %?
Kunjapat Mugunan- Malaysia
December 28, 2011
EDX is Energy Dispersive X-Rays (aka EDAX - energy dispersive x-ray analysis) and is dependent on the atomic mass of the elements being detected. The lower the atomic mass (and hence number) the less easy it is to detect. Hence, if you have a sample of mixed elements with a wide ranging atomic numbers, the detector peak sizes will not be very representative of the exact atomic ratios of elements present. The best way to ensure good analysis is to run standards of the elemental mixes to see how the EDX spectra vary with the compositional ratios. The better measure is atomic % and not weight %, but the two can be interchanged by using the correct conversion factor
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Trevor Crichton R&D practical scientist The Pheasantries - Chesham, U.K. |