Abstract
Application of SEM-EDXA instrumentation to rough fracture surface specimens of cement systems should be carried out with due regard to certain inherent problems. Data indicate that the effective lateral spread of the x-ray source may be as much as 1.5 μm. Theoretical calculations and experimental evidence are supplied indicating that variations in take-off and incidence angles can cause significant variations in ratios of peak heights obtained for a given composition, but that if the take-off angle is restricted to the range between 60° and 90° and the incidence angle to between 45° and 90° acceptable results may be obtained. The problems involved in compositional analysis are discussed; it is suggested that the operator maintain awareness of geometric and other possible sources of error and avoid recording spectra in areas that may be subject to such difficulties.
Published Version
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