Abstract
Instrumental elemental analysis requiring only desk-top equipment can now be used to quickly perform assays on rock samples. Monochromatic radiation from radioisotope sources irradiating 44 mg of rock powder cause X-ray fluorescence with X-rays emitted recorded by computer-based multi-channel analyzer display programs. Although many sources may be used to fluoresce the sample, a 109Cd radiation source fluoresces elements heavier than Ca and lighter than Mo, in a single scan. Calibration of peak intensities using standards of any element between Ca and Mo, enables quantitative determination of the concentration of that element. A specific application of this system is to determine weight-percent Fe concentration (to 0.1% precision) in carbonate rocks. These data allow better understanding of geophysical well logs intended to assist in location of porosity and hydrocarbons.
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