e nergy d ispersive x -ray fluorescence spectrometer
DESCRIPTION
EDX-720 Training. E nergy D ispersive X -ray Fluorescence Spectrometer. E nergy D ispersive X -ray Fluorescence Spectrometer. An Atom. Electrons. Nucleus: Protons Neutrons. K. L. M. Orbital or shell. Atoms & Energy. Atoms can absorb and release energy using electrons. - PowerPoint PPT PresentationTRANSCRIPT
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Energy Dispersive X-ray Fluorescence
Spectrometer
Energy Dispersive X-ray Fluorescence Spectrometer
EDX-720 Training
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KL
M
Atoms & Energy
Atoms can absorb and release energy using electronsAtoms absorb energy by
promoting an electron to a higher energy orbital
Energy
Atoms release energy by demoting electrons to a
lower energy orbital
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X-Rays Are a Type of Electromagnetic Wave Also Light or Energy
What are X-Rays?.......Energy
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Two types of X-Rays
Continuous X-rays vs. Characteristic X-rays
High energyBroad spectrumEnergy in
Low energyDiscrete spectrumEnergy out
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KL
M
X-ray Tube (Rh)
DETECTER
Energy Put into the System(Continuous X-ray)
Energy Released from the System
(Characteristic X-ray)
Two types of X-Rays
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Rh creates it own spectra
Sensitivity is low in these areas
Introducing a filter reduces the Rh background
Increases Sensitivity! ! !
EDX-720 includes: Ag, Mo, MoNi, Ti
Ag Mo Ti
MoN
i
Filters
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With primary filterWithout primary filter
Filters (Cont.)
• X-ray tube consist of characteristic X-ray (Rh) and continuous X-rays.• Continuous X-rays are background• Filters decrease background
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Intensity vs. Matrix
Intensity and Density are inversely related
Density affects the analyte’s ability to Fluoresce through the matrix
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Air, Helium, or Vacuum: Elements in the range of Na – Sc
Measurement under Helium or Vacuum • Allows analysis of light elements whose x-ray emissions may
be absorbed by air, and • Increasing sensitivity for light elements
Solid - Air, Vacuum, or HeliumLiquid - Air, HeliumPowder - Air, Helium
Measurement Atmosphere
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Types of Analyses
Two Types of Analyses:
Qual/Quant Quantitative
Analysis Conditions:
FP (Fundamental ParametersCalibration Curve
Sample Form:
BulkFilmsFilter Paper
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10 mm 5 mm 3 mm 1 mmCCD Camera
X
Y
X,Y Positioner
Collimator ExchangerHardware Accessories
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• Up to 16 samples
• Analysis in air
• Analysis under He/Vacuum for lighter elements
• Continuous measurement using a sample turret
Sample Turret