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# An automatic multielement-indexing X-ray spectrograph, capable of the qualitative and quantitative determinations of as many as 24 elements in a single sample. Choice of the elements may be made from magnesium through all the heavier elements. The device measures the intensity of an emitted wavelength band from a standard sample and compares it with the intensity of a like band from an unknown sample. These data are presented in the form of a ratio of one intensity to the other. Nelson 
# An automatic multielement-indexing X-ray spectrograph.  <br/>Source: Dictionary of Mining, Mineral, and Related Terms