The Composition of An XRF
The most common XRF (X-ray Fluorescence Spectrometer, either desktop type or handheld type) are composed by the following for major parts:
X-ray emission tube
A high voltage to accelerate the electrons strike the anode target, such as rhodium (Rh), silver (Ag), chromium (Cr), molybdenum (Mo), tungsten (W), so as to generate electron excitation, emit X rays (X Light) .
Sample load device
Most handheld XRF method directly using direct detection of, at most, around the emission source, a light mask designed to prevent interference.And desktop devices, the user, after sample collection, the sample was placed in the sample on a stage, in order to analyze XRF.
X-ray detector
Including solid state detector or a gas-filled proportional counter detector and so on. Contains solid state mercuric iodide detectors (HgI2), mercury and lithium silicon Si Si (Li), mercury iodide (HgI2) detector for use in low-power thermoelectric cooling device to control the operating temperature below room temperature Next, silicon mercury detector can also be used to cool the via thermoelectric Peltier effect, while the lithium-silicon detectors are required to be cooled down to a minimum - 90 ℃, which can be used in liquid nitrogen cooling mode or via a thermoelectric Peltier effect to cool the.
The data processing system
Including measuring the pulse amplitude analyzer as much frequency channel (MCA), the signal can be processed into X - ray energy spectrum, and then calculate the sample element concentration analyzer, and analysis of data display and storage systems.
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