The use of electronic discrimination at a fixed goniometer position for an X-ray spectrographic determination is a conventional means of improving the signal-tonoise ratio and minimizing interferences due to multiple-order diffractions of radiation with shorter wavelengths. The same advantage can be gained with a moving goniometer in a scanning procedure if adjustment of the baseline of the electronic discriminator is properly coordinated with the movement of the goniometer. Å study of optimum baseline levels for various wavelengths in the range of 0.3 to 3.0 Å indicated a hyperbolical correlation of optimum baseline voltage vs. 2θ angle. This experimental correlation is the basis for synchronization of electronic discrimination with movement of the goniometer during the scanning procedure. A suitable mechanism for coordinated baseline adjustment was developed by Technical Equipment Corporation, Denver, Colorado, and improved results are obtained for trace analysis with a scanning technique routinely used for qualitative, semiquantitative determinations for elements with atomic numbers 22 and higher.

Semiquantitative results are adequate for the satisfactory solution of many problems involving mineral analyses, andfluorescent X-ray spectrography is gaining more recognition as a satisfactory method for performance of these analyses.Successful applications of the method, in various instances are discussed to demonstrate a system involving minimum s am - pie preparation and the use of instrumental factors in establishing multielement calibration curves.

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