Instrumental Calibration, Standards, Quantitative Analysis, and ...
Instrumental Calibration, Standards, Quantitative Analysis, and ...
Instrumental Calibration, Standards, Quantitative Analysis, and ...
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<strong>Calibration</strong> Issues for Electron-Probe Microanalysis<br />
• Microprobe performance specifications are:<br />
Driven by capabilities <strong>and</strong> address problem solving for customers<br />
Capabilities are funded by purchases, user/vendor development<br />
Realistic specifications for WDS vs. EDS systems<br />
• Instrument calibration during installation <strong>and</strong> testing<br />
Spectrometer alignment – to electron column <strong>and</strong> mutual agreement<br />
Detector linearity with count rate <strong>and</strong> deadtime issues<br />
Precision = reproducibility (mechanical, electronic)<br />
Accuracy = correct K-ratio measured<br />
• Instrument calibration – short vs. long term<br />
Consistent performance with time<br />
Accuracy in international interlaboratory environment<br />
• Geological EPMA<br />
CMAS silicate st<strong>and</strong>ards used for acceptance testing (CIT, WU)<br />
UO EPMA Workshop 2008