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XRF nondestructive sample analysis is very convenient when applied to samples that should not be altered, for example, works of art or archeological pieces. When one has various similar samples of this characteristic, a good sample comparison method is necessary. There are various comparison methods among which the three component graphic representation allows a comparison in a throe element component. In an XRF analysis, a large number of peaks, representing emissions from K and L lines normally appear. When a well calibrated spectrum is provided, the determination of the elements in the samples is relatively simple. However, accuracy is difficult to acheive when results from many samples are to be compared.

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