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Originally Posted by Jeff Pringle
You can get trace elements by INAA as well as EMP, with a very small sample size.
I think in addition to a good Iridium anomaly, a blade with a percentage of meteorite would have oxygen isotopes that are skewed off the terrestrial mass fractionation line.
By looking at the Cobalt/Nickel ratio you might get some clues as well.
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For those who are hard core, here is a link on INAA:
http://www.ncnr.nist.gov/div8395/inaa.html