A rapid x-ray fluorescence procedure applicable to exploration geochemistry

A rapid X-ray fluorescence method is described for the analysis of all elements heavier than iron. It is based upon the measurement of a peak and background, while primary scattered radiation is used to correct or compensate for matrix effects. About 15 analyses per man hour can be made on individual samples for such elements as Th, Nb, Ta and W, which are normally difficult to determine by other techniques. Lower limits of detection of about 50 ppm are routinely obtained, and even lower limits of detection (e.g., 20 ppm) can be obtained should these be necessary by increasing the counting time (from 20 to 40 seconds).