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<p>[QUOTE=&quot;Oldhoopster, post: 7932311, member: 84179&quot;]A good, general value for XRF penetration depth is 100 microns (0.004&quot;).&nbsp; As said in the articles, the depth can vary depending on the material and energy of the beam, but more than 0.010&quot; would be difficult, especially with a handheld unit and no sample prep.&nbsp; This is usually deep enough to go through most plating processes (The copper plating on Zincoln cents is approx 8 microns). </p><p><br /></p><p>I&#039;ve frequently used XRF data (as well as XRD and SEM-EDS) as part of my job for years.&nbsp; Understanding how the equipment works and its limitations is important when analyzing the data.&nbsp; XRF is considered a surface analysis, but understanding the penetration depth is a key factor in understanding the data.[/QUOTE]</p><p><br /></p>

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