Background reduction of x-ray fluorescence spectra in a secondary target energy dispersive spectrometer

1979 ◽  
Vol 165 (1) ◽  
pp. 63-65 ◽  
Author(s):  
P. Standzenieks ◽  
E. Selin
Keyword(s):  
Fluorescence Spectra ◽  
Energy Dispersive Spectrometer ◽  
Energy Dispersive ◽  
X Ray ◽  
Secondary Target ◽  
Background Reduction ◽  
Target Energy

Monte Carlo simulation of backscattered peaks in secondary target energy-dispersive x-ray spectra

1986 ◽  
Vol 15 (4) ◽  
pp. 231-238 ◽  
Author(s):  
Peter Van Dyck ◽  
Szabina Török ◽  
René Van Grieken
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Energy Dispersive ◽  
X Ray ◽  
Secondary Target ◽  
Target Energy

Energy Dispersive X-Ray Measurements of thin Metal Foils

1976 ◽  
Vol 34 ◽  
pp. 426-427
Author(s):  
J. Bentley ◽  
E. A. Kenik
Keyword(s):  
Materials Science ◽  
Energy Dispersive Spectrometer ◽  
Thin Foil ◽  
Thin Metal ◽  
Energy Dispersive ◽  
Thin Specimen ◽  
X Ray ◽  
Metal Foils ◽  
Small Probe ◽  
Scanning Transmission

Instruments combining a 100 kV transmission electron microscope (TEM) with scanning transmission (STEM), secondary electron (SEM) and x-ray energy dispersive spectrometer (EDS) attachments to give analytical capabilities are becoming increasingly available and useful. Some typical applications in the field of materials science which make use of the small probe size and thin specimen geometry are the chemical analysis of small precipitates contained within a thin foil and the measurement of chemical concentration profiles near microstructural features such as grain boundaries, point defect clusters, dislocations, or precipitates. Quantitative x-ray analysis of bulk samples using EDS on a conventional SEM is reasonably well established, but much less work has been performed on thin metal foils using the higher accelerating voltages available in TEM based instruments.

A multiplatform code for the analysis of energy-dispersive X-ray fluorescence spectra

2007 ◽  
Vol 62 (1) ◽  
pp. 63-68 ◽  
Author(s):  
V.A. Solé ◽  
E. Papillon ◽  
M. Cotte ◽  
Ph. Walter ◽  
J. Susini
Keyword(s):  
Fluorescence Spectra ◽  
Energy Dispersive ◽  
X Ray

Improved optics of the energy dispersive spectrometer for X-ray absorption spectroscopy

1989 ◽  
Vol 158 (1-3) ◽  
pp. 317-321 ◽  
Author(s):  
H. Tolentino ◽  
E. Dartyge ◽  
A. Fontaine ◽  
G. Tourillon
Keyword(s):  
Absorption Spectroscopy ◽  
Energy Dispersive Spectrometer ◽  
Energy Dispersive ◽  
X Ray ◽  
X Ray Absorption

A Comparison of the XRF11 and EXACT Fundamental Parameters Programs when Using Filtered Direct and Secondary Target Excitation in EDXRF

1982 ◽  
Vol 26 ◽  
pp. 369-376 ◽  
Author(s):  
Ronald A. Vane
Keyword(s):  
Energy Dispersive ◽  
Fluorescence Spectrometry ◽  
X Ray ◽  
Fundamental Parameters ◽  
Secondary Target ◽  
Direct Excitation

The XRF11 program by John Criss and the EXACT program are two commercially available fundamental parameters programs for energy dispersive x-ray fluorescence spectrometry (EDXRF). These programs are both based on the same underlying equations but use different approaches to the calculations. The EXACT program assumes monochromatic excitation, and the XEF11 program models polychromatic excitation sources. There are also great differences in how the two programs approach the iterations in the calculations and in how the data from standards are used in the two programs for calibration.To produce the monochromatic excitation neeiled by the EXACT program, secondary targets have been the preferred method. But it is also possible to approximate monochromatic excitation by using filtered direct excitation. The purpose of this study is to compare the data obtained from both secondary targets and direct filtered excitation as processed through both XRF11 and EXACT.

Matrix Correction With Barkla Excitation Using the Coherent/Incoherent Method

1993 ◽  
Vol 37 ◽  
pp. 667-675
Author(s):  
Walter Swoboda ◽  
Burkhard Beckhoff ◽  
Birgit Kanngieβer ◽  
J. Scheer
Keyword(s):  
Fluorescence Spectra ◽  
Matrix Correction ◽  
Excitation Mode ◽  
Excitation Radiation ◽  
X Ray ◽  
Secondary Target ◽  
Direct Excitation ◽  
Cartesian Geometry

The scattering of the primary X-ray tube spectrum on a low Z material in 90°-geometry produces polarised excitation radiation, which clearly decreases the background of fluorescence spectra in Cartesian geometry (Barkla excitation). Several publications have shown the advantages of this excitation mode in comparison with both direct excitation and secondary target excitation.

New nonradioactive microspheres and more sensitive X-ray fluorescence to measure regional blood flow

1992 ◽  
Vol 263 (6) ◽  
pp. H1946-H1957 ◽  
Author(s):  
H. Mori ◽  
S. Haruyama ◽  
Y. Shinozaki ◽  
H. Okino ◽  
A. Iida ◽  
...  
Keyword(s):  
Blood Flow ◽  
Synchrotron Radiation ◽  
Flow Measurement ◽  
Fluorescence Spectra ◽  
Regional Blood Flow ◽  
Energy Dispersive Spectrometer ◽  
X Ray ◽  
Dispersive System ◽  
Monochromatic Synchrotron ◽  
Higher Sensitivity

We developed new nonradioactive microspheres and used more sensitive X-ray fluorescence spectrometers than used previously to measure regional blood flow in the heart and other organs. We demonstrated the chemical stability of eight kinds of heavy element-loaded microspheres and validated their use for regional blood flow measurement by comparing duplicate flows measured with radioactive and/or nonradioactive microspheres in both acute and chronic dog experiments. The wavelength-dispersive spectrometer (Philips PW 1480) has a higher sensitivity than the previously described X-ray fluorescent system and reduced the number of microspheres required for accurate measurement. The fine energy resolution of this system makes it possible to increase the numbers of different kinds of microspheres to be quantitated, but at present only eight kinds are available. We also used a synchrotron radiation-excited energy dispersive spectrometer. The monochromatic synchrotron radiation allowed us to obtain much higher signal-to-background ratios of X-ray fluorescence spectra than with the wavelength-dispersive system (50 dB more for Zr-loaded microspheres) and will enable analysis of fluorescent activity in smaller regions (< 20 mg) than the radioactive method does.

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