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<p>[QUOTE=&quot;desertgem, post: 2405136, member: 15199&quot;]There are several articles on accuracy -mol. mass- beam intensity-depth relationships from XRF on the net that indicate low powered handheld units, at the best ,for a heavy element such as gold, might just be the surface or maybe a few to 100s&nbsp; micrometers of depth. For copper it is less by a large factor, so I would consider a higher intensity lab setup ( about $100 per test) to compare results from a 1942 cent and a &#039;copper 43 type cent&#039;&nbsp; for best argumentation, or drill a hole into it half way <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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