Re: The case of the missing elements
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I think you are comparing two different files. One is Allanite the
other is Melanocerite, one from
Canada one from Norway.
Send single spectra plots no overlays.
Dud
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From: [email protected] [mailto:[email protected]]
On Behalf Of Charles David Young
Sent: Friday, February 7, 2020 2:12 PM
To: [email protected]; Mike Loughlin
Subject: [XRF] The case of the missing elements
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I recently picked up a specimen of melanocerite-Ce at the
mineral show and did a scan without Am241 by depending on the internal
radiation.? I was not surprised to see Th La Ce and Nd in the blue plot.
Then I wanted to see if I got the same results using Am241
as an additional exciter.? So I carefully moved the specimen just far
enough from the detector to allow me to slide in the Am241 jig.? I was
careful to keep the same spot on the rock even though it looked quite uniform.
Curiously I am now getting additional strong Fe and Y peaks
in the red plot.? What could account for this?? I am not surprised
that the La Ce Nd are lit up as they are.
I have also attached both .mca files in case one wishes to
analyze them.? However, I am not really asking for that.? I would
just like to understand why the Am241 lights up the Fe and Y so strongly
compared to the internal radiation.? It is kind of a pain to weed through
the Am241 background peaks but it appears that I may not get a complete picture
with the internal radiation alone.
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