387 23
Analysis with a compromised sample shape:
surface gouge crater left by tool impact
aMg (normalized weight percent)Fe (normalized weight percent)Analysis of K411: Bulk polished and tool gouge crater0510152025303540012345678910 11 12BULK-K411BULK-600grit1Extent of ideal
flat specimen
measurementsb. Fig. 23.8 a SEM (ET+)
SE + BSE image of a crater pro-
duced in polished K411 glass
after gouging with a diamond
scribe. b Plot of the normalized
Mg and Fe concentrations calcu-
lated for measurements at vari-
ous locations in this crater
23.4 · Useful Indicators of Geometric Factors Impact on Analysis