> Can anybody tell me what 99.9 atm% carbon 13 would convert to if
> expressed as the delta notation?

While we are discussing this:

        Is there any reason why an IRMS could not calculate, with great
accuracy, the enrichments close to 99.5 and above?  The opposite is true for
natural abundance of 15N - 99.5 % 14N.  I realize that the collector for mass
29 in this situation is much more sensitive, but couldn't you just swap the
wires between the faraday cups to their respecitve amplifiers or perhaps turn
the whole section upside-down so that the cups were in reverse order?

myq


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