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Electron Microprobe Lab, University of Minnesota

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*

Hi,

this answer brings a question to my mind.
When is it possible to do a quantitative analysis on a probe with a  
rastered beam on an inhomogeneous sample?

I sometimes get asked this, but even though the software allows it, I  
always say no. I assumed that the matrix correction for every point in  
the raster will be based on the average x-ray intensity, yet this  
might be different than the matrix correction required at a given  
point in an inhomogeneous sample.

Have I missed something?

Thanks,
Ron



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Moderator: Ellery Frahm, [log in to unmask],
Electron Microprobe Lab, University of Minnesota

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*

Most of the samples we receive are of this type (Platinum-Aluminide coatings
of engine parts).  I use pure element standards and have pretty good
success. The difficulty is that the material is very inhomogeneous and the
customer usually wants an average composition. They require analyses with a
beam raster over a certain area of the coating. I usually have a set of
about 10-12 elements in the analysis.

Chuck Herrington
Geller MicroÅnalytical Lab, Inc.
978-887-7000
[log in to unmask]


   _____

From: JEOL-Focused Probe Users List [mailto:[log in to unmask]] On
Behalf Of Ellery Frahm
Sent: Wednesday, April 04, 2007 12:01 PM
To: [log in to unmask]
Subject: [PROBE-USERS] Ni-Pt-Al standard?


JEOL Probe Users Listserver

Moderator: Ellery Frahm, [log in to unmask], Electron Microprobe Lab,
University of Minnesota


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* Probe folks,


I have a post-doc researcher here in one of our engineering departments who
is interested in analyzing a Ni-Pt-Al system. I've been trying pure metals
as standards for his samples, but obviously I'd like to minimize any
absorption or fluorescence issues there might be. Does anyone have any
experience with such a system? Do you know of suitable standards for such a
system, or have you just used pure metals?

Thanks,
Ellery

--------------------

Ellery E. Frahm

Research Fellow & Manager

Electron Microprobe Laboratory

University of Minnesota - Twin Cities

Department of Geology & Geophysics

Lab Website: http://probelab.geo.umn.edu

Personal Website: http://umn.edu/~frah0010