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<p>[QUOTE=&quot;desertgem, post: 3061692, member: 15199&quot;]I didn&#039;t know that the SEM/EDS analysis could do such a large area as a 5 cent coin. I know it is very accurate on extremely small scale ( microns), but it seems that even if many points were read, it would not allow an overall % without more possible error on the whole coin. A large assumption on the alloy mix, whereas the &#039;gun&#039; has a wider beam and gives a more accurate reading of the whole coin. I have used several SEMs , but not one with a EDS. As to a gun, I would expect to have as high accuracy as on gold and silver myself as a nickel or silver 5 cent coin. Jim[/QUOTE]</p><p><br /></p>

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