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<p>[QUOTE=&quot;-jeffB, post: 7930830, member: 27832&quot;]Okay, yeah, I&#039;ll admit the APS was over the top. When someone says &quot;the best of the best&quot;, I let my imagination run free. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>As for hand-held gun cost, if somebody one day produces a reliable hand-held XRF the price of a double eagle, I&#039;ll be first in line to grab one. Today, they start around ten times that. I&#039;ve seen used ones offered for less than $10K, but with no guarantees.</p><p><br /></p><p>The numbers I&#039;ve found indicate that effective penetration depth in gold is much less than a millimeter. Remember, the higher-energy X-rays have to get <i>into</i> the deeper sample, but then the lower-energy fluorescence X-rays need to <i>get back out</i>, too. If there&#039;s just thin gold plating, the gun will see through it. If there&#039;s a half-millimeter or more of gold around a tungsten core, it can&#039;t. To detect that, you need a sonic or electronic method.[/QUOTE]</p><p><br /></p>

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