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Energy Dispersive X-ray Fluorescence (EDXRF) spectrometry is a versatile analytical technique that can satisfy both of these needs: it is non-destructive, requires very little sample preparation and can be configured to handle any sample size from a large surface to a few microns.
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Most instruments scan across a range of mass numbers, measuring each isotope sequentially.
Because only one mass/ charge ratio is measured at a time, any fluctuations due to the sample introduction process, the plasma, or the detection system can introduce errors in the observed isotope ratios.