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<p>[QUOTE="Oldhoopster, post: 3218233, member: 84179"]Doesn't matter if you use a $14000 handheld model or one in an analytical lab that costs more than 10x that, the X-rays only penetrate a short distance below the surface. Neither your coin shop nor the MIT Chem lab will be able to use XRF to differentiate between solid gold and thick gold plating. As Mr Scott used to say on the Starship Enterprise, "it's against the laws of physics"[/QUOTE]</p><p><br /></p>
[QUOTE="Oldhoopster, post: 3218233, member: 84179"]Doesn't matter if you use a $14000 handheld model or one in an analytical lab that costs more than 10x that, the X-rays only penetrate a short distance below the surface. Neither your coin shop nor the MIT Chem lab will be able to use XRF to differentiate between solid gold and thick gold plating. As Mr Scott used to say on the Starship Enterprise, "it's against the laws of physics"[/QUOTE]
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