[NewCandle] los artifactos

[Nick Reiter]

Hi Robin,

Yes, I guess you are technically right!  Although my
guess is that the presence of a very small (real)
silver signal would be additive or augment the
pseudo-signal to some degree, it might be very
difficult to say by EDS that there wasn't something
there.  However, by the time one gets to that level,
EDS is not the right tool anymore... one would need to
look at another form of mass spec, such as GDMS, AA,
ICP, or SIMS.

best,

n

--- Robin van Spaandonk <rvanspaa at bigpond.net.au>
wrote:

> In reply to  Nick Reiter's message of Thu, 4 Sep
> 2008 10:46:35 -0700 (PDT):
> Hi,
> [snip]
> >I'll not dwell on the long version, but in essence,
> >even a bona fide Ag signal (from looking at 200A of
> Ag
> >deposited on Al foil) loses the "second" 3.151keV
> line
> >in the grass when the magnitude drops low enough...
> 
> 
> Surely this just means that a real, but weak, silver
> signal is indistinguishable
> from a double Al signal? How does that then mean
> that you *don't* have a weak
> silver signal?
> 
> >down to around 3 to 4% from the EDAX semi-quant. 
> You
> >really can only differentiate the double Al from a
> low
> >level but real Ag signal, by looking at a high
> purity
> >standard (I used a 99.999 Al evaporation slug)
> [snip]
> Regards,
> 
> Robin van Spaandonk <rvanspaa at bigpond.net.au>
> 
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