| XRF ||Subject: Resources & Reserves|
[exploration] The X-ray Fluorescence spectrometer or spectrometry. Like the probe, the XRF measures the intensity of emitted radiation, in this case from a fused glass or pressed powder sample an inch or more across, but the excitation energy is provided, not by an electron beam, but by a primary X-Ray source of very high energy produced by focussing an electon beam inside a sealed tube onto a metallic target which may be Cr, W, Rh, etc. These primary tubes operate at 2 – 3 kilo-watts and a 100 KV. XRF is still one of the best analytical tools for determination of major elements as well as the TE Cr, Co, Ni, Cu, Zn, Ga, Rb, Sr, Zr, Nb, Th, Ba in bulk samples. Detection limits can be as good as 0.2 ppm, more commonly about 1 – 3 ppm.
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