13 X-ray Physics 13.6 X-ray fluorescence spectroscopy
P2544001
X-ray energy spectroscopy - calibration of the X-ray energy detector
Fluorescence lines of zinc with a fitted normal distribution
Principle
XR 4.0 X-ray energy detector (XRED)
Various metal samples are subjected to polychromatic X-rays. The resulting fluorescence radiation is analysed with the aid of a semiconductor detector and a multi-channel analyser. The maxima of intensity of the corresponding characteristic X-ray lines are determined. The predefined energy values of the characteristic lines and channels of the multi-channel analyser that must be assigned in turn result in a calibration of the semiconductor energy detector. Tasks 1. Record the spectra of the fluorescence radiation that is generated by the metal samples. 2. Determine the channel numbers of the maxima intensity of the characteristic lines of the corresponding fluorescence radiation. 3. Represent the predefined line energies as a function of the channel numbers graphically for two gain factors of the multi-channel analyser. What you can learn about ▪ Bremsstrahlung, characteristic X-radiation, energy levels, fluorescence radiation ▪ conduction processes in semiconductors, doping of semiconductors, pin-diodes, semiconductor energy detectors, multichannel analysers
Main articles XR 4.0 expert unit XR 4.0 X-ray energy detector (XRED) XR 4.0 X-ray goniometer XR 4.0 X-ray plug-in unit W tube Multi channel analyser XR 4.0 X-ray Specimen set metals for X-ray fluorescence, set of 7
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Function and Applications With the new X-ray energy detector you can directly determine the energies of single x-ray quanta. Benefits ▪ In connection with the multi-channel analyser (MCA) you can characterise the complete x-ray energy spectrum of the analysed material. Characteristic x-ray lines for all elements of the PSE included in the software. ▪ Directly mountable on the goniometer of the x-ray unit, without loss of functionality of the goniometer ▪ Directly connectable to MCA (USB) without any additional interface on, Green Operation-LED ▪ Parallel observation of the signals in the oscilloscope (optional) Typical application laboratory experiments in universities and high schools: ▪ Characterisation of X-rays of different anode materials (Cu, Fe, Mo), Fluorescence analysis of pure materials and alloys ▪ Determination of the composition of alloys ▪ Compton effect-Mosley's law-Energy dispersive Bragg structure analysis 09058-30