SUPERXAP- A Personal-Computer-Based Program for Energy-Dispersive X-Ray Spectra Analysis

1992 ◽  
Vol 36 ◽  
pp. 17-25
Author(s):  
D.B. Yager ◽  
J.E. Quick
Keyword(s):  
Least Squares ◽  
Matrix Effects ◽  
Energy Dispersive ◽  
Spectra Analysis ◽  
X Ray ◽  
Peak Overlap ◽  
Elemental Abundances ◽  
On Line ◽  
Computer Based ◽  
Counting Statistics

AbstractSUPERXAP (Super X-ray Analysis Program) enables IBM-compatible personal computers to analyze energy-dispersive spectra using least-squares spectral deconvolution. The program corrects for instrument drift, background, peak overlap, and matrix effects. Pull down menus provide 24 subroutines and functions, that allow spectra to be transferred, stored, viewed, manipulated, and analyzed. Spectral peaks can be identified manually or automatically with color-coded K, L or M lines. Working curves are developed using an interactive routine that creates standard files by least-squares fitting of peak intensities to known elemental abundances. Elemental abundances in unknowns may be determined in a variety of ways including on-line analysis of spectra as they are generated by an energy-dispersive detector and by batch analyses of spectra stored on disk. Standard deviation, based on counting statistics, is reported for each element in each analysis. Written in QuickBASIC 4.5 for interface with a KEVEX 7000 radioactive-source x-ray fluorescence analyzer, SUPERXAP could be adapted, with minor modification, to accept and analyze data from other instruments that produce energy-dispersive spectra.

Energy Dispersive X-Ray Fluorescence Spectrometry at High Count Rates: Pulsed Tube Excitation and Recovery of Resolution by Computer Processing

1975 ◽  
Vol 19 ◽  
pp. 153-160 ◽  
Author(s):  
J . E. Stewart ◽  
H. R. Zulliger ◽  
W. E. Drummond
Keyword(s):  
Time Use ◽  
Digital Processing ◽  
Peak Shift ◽  
Energy Dispersive ◽  
High Count ◽  
X Ray ◽  
On Line ◽  
Computer Based ◽  
Time Required ◽  
Channel Analyzer

Energy dispersive X-ray spectrometry has the potential for making very rapid analyses of multi-element samples. In order to fully exploit this capability several studies have been carried out with the goal of improving performance at high input count rates. A refined amplifier permits operation at input count rates up to 80000 per second with minimal peak shift and distortion. Optimum choice of tube parameters and filters permits utilization of a single Mo transmission target tube to analyze a broad range of elements in minimum time. Use of a pulsed tube further reduces the time required for analysis without sacrifice of precision or resolution. Dead time necessarily increases with increasing input count rate. It can be reduced by selecting a short amplifier time constant, but only with a loss of resolution. Digital processing permits recovery of the lost resolution. Some illustrations are given of spectra that have been processed on-line using a computer based multi-channel analyzer.

Handheld Portable Energy-Dispersive X-Ray Fluorescence Spectrometry (pXRF)

2016 ◽  
pp. 362-381 ◽  
Author(s):  
Elisabeth Holmqvist
Keyword(s):  
Production Systems ◽  
Matrix Effects ◽  
Chemical Characterization ◽  
High Sensitivity ◽  
Limited Range ◽  
Energy Dispersive ◽  
Analytical Sensitivity ◽  
X Ray ◽  
Non Destructive

Handheld portable energy-dispersive X-ray fluorescence (pXRF) spectrometry is used for non-destructive chemical characterization of archaeological ceramics. Portable XRF can provide adequate analytical sensitivity to discriminate geochemically distinct ceramic pastes, and to identify compositional clusters that correlate with data patterns acquired by NAA or other high sensitivity techniques. However, successful non-destructive analysis of unprepared inhomogeneous ceramic samples requires matrix-defined scientific protocols to control matrix effects which reduce the sensitivity and precision of the instrumentation. Quantification of the measured fluorescence intensities into absolute concentration values and detection of light elements is encumbered by the lack of matrix matched calibration and proper vacuum facilities. Nevertheless, semi-quantitative values for a limited range of high Z elements can be generated. Unstandardized results are difficult to validate by others, and decreased analytical resolution of non-destructive surface analysis may disadvantage site-specific sourcing, jeopardize correct group assignments, and lead to under-interpretation of ceramic craft and production systems.

Energy Dispersive Analysis for Adjacent Elements Using Two Single Channel Analyzers

1971 ◽  
Vol 15 ◽  
pp. 197-208
Author(s):  
Hubert K. Chow
Keyword(s):  
Single Channel ◽  
Matrix Effects ◽  
Pulse Height ◽  
Silicon Detector ◽  
Emission Spectra ◽  
Empirical Method ◽  
Energy Dispersive ◽  
Standard Samples ◽  
X Ray ◽  
Adjacent Element

Energy dispersive x-ray analysis has become an extremely useful analytical tool. The technique provides for the direct observation of x-ray emission spectra, eliminating the need for a dispersive crystal. The purpose of this reported investigation was to study the use of the technique with a simple pulse height analyzing system and to develop a routine method for correcting Interferences due to adjacent element spectral overlap and matrix effects.The analyzing system consists of a radioisotope source, a lithium drifted silicon detector, a preamplifier, an amplifier, two single channel analyzers and two digital ratemeters. In order to obtain results suitable for quantative measurement, a two-step empirical method was employed for the correction of peak overlapping and matrix effects. If two peaks in a spectrum overlap at their tails, one can set up a channel width of the analyzer to a region where there are no overlapping pulses. It is then possible to calibrate the ratio of the intensity obtained from this channel to that obtained from the whole peak in its pure state, i.e. without the appearance of a neighbor peak. The actual intensity of the peak in the overlapping spectrum is, therefore, the observed counts multiplied by the ratio. The next step is the correction of matrix effect by means of conventional empirical methods using standard samples. Two types of the samples, Zn-Cu powder mixtures and Ee-Cu in aqueous solutions, were studied to illustrate this method. The usefulness of applying the analyzing system and technique to industrial measurements, either on-line or batch, will also be discussed.

On Stream Analysis of Lead and Zinc Ore Fractions Using Energy Dispersive and Wavelength Dispersive Techniques

1980 ◽  
Vol 24 ◽  
pp. 289-296
Author(s):  
S. K. Kawatra ◽  
J. L. Dalton
Keyword(s):  
Fluorescence Analysis ◽  
Energy Dispersive ◽  
Accurate Information ◽  
Excitation Wavelength ◽  
Processing Industry ◽  
X Ray ◽  
Milling Operations ◽  
Lead And Zinc ◽  
Dispersive System ◽  
On Line

AbstractOn-line X-ray fluorescence analysis is used in the mineral processing industry to monitor the composition of the solids contained in various slurry streams. This study compares wavelength dispersive and energy dispersive techniques by using a slurry recirculation system employing both an X-ray tube excitation-wavelength dispersive system, and an isotope-excitation energy dispersive system. The results showed the less costly energy dispersive system yields accurate information that can be used to control milling operations.

Mineral profiles of legumes and fruits through partial least squares energy dispersive X-ray fluorescence

2019 ◽  
Vol 82 ◽  
pp. 103240
Author(s):  
L. Herreros-Chavez ◽  
F. Oueghlani ◽  
A. Morales-Rubio ◽  
M.L. Cervera ◽  
M. de la Guardia
Keyword(s):  
Least Squares ◽  
Partial Least Squares ◽  
Energy Dispersive ◽  
X Ray
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