Abstract
Recently the Northern Microanalyser Group have been carrying out a number of co-operative microanalysis experiments. Initially the object was to find how accurately a homogeneous sample could be analysed by a number of laboratories. The result of this experiment led the group to examine in more detail several specific aspects of electron probe microanalysis where it was felt that the associated errors could be quantified. These aspects were: 1. (a) The effect of surface roughness on the X-ray intensity ratio. 2. (b) The effect of contamination on count rate. 3. (c) The effect of tilt of the specimen surface on the X-ray intensity ratio. 4. (d) The effect of differences in specimen and reference sample heights on X-ray intensity. 5. (e) Spectrometer relocation. 6. (f) The effect of counter dead time on the intensity ratio. 7. (g) Counting statistics. The result of the initial experiment and the subsequent group of seven experiments are discussed and quantitative values for the various errors determined.
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