Instrumental Calibration, Standards, Quantitative Analysis, and ...
Instrumental Calibration, Standards, Quantitative Analysis, and ...
Instrumental Calibration, Standards, Quantitative Analysis, and ...
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Accuracy Study for EPMA<br />
Comparison of Measured to Calculated K-ratio<br />
•K measured<br />
dependent on:<br />
Accelerating Potential<br />
Probe current<br />
Detector (gas, sealed)<br />
Pulse processing<br />
PHA calibration<br />
Deadtime<br />
Spectrometer alignment<br />
Sample homogeneity<br />
P-B determination, stripping, counting statistics<br />
Other sampling/drift factors<br />
•K calculated<br />
dependent on:<br />
Correct composition of st<strong>and</strong>ard<br />
Correction algorithms<br />
Data sets, mass absorption coefficients<br />
Other algorithmic factors<br />
K<br />
K<br />
measured<br />
C = K * ZAF<br />
calculated<br />
Evaluate :<br />
(P − B)<br />
=<br />
(P − B)<br />
= C / ZAF<br />
K<br />
K<br />
measured<br />
calculated<br />
sample<br />
st<strong>and</strong>ard<br />
UO EPMA Workshop 2008