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EDX-720 Training
E
nergy Dispersive X-ray
Energy Dispersive X-ray
Fluorescence Spectrometer
Fluorescence Spectrometer
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An Atom
Electrons
Nucleus:
K
L
M
Orbital or shell
Protons
Neutrons
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Atoms & Energy
Atoms can absorb and release
energy using electrons
Atoms absorb energy by
promoting an electron to a
higher energy orbital
K
L
M
Atoms release energy by
demoting electrons to a
lower energy orbital
Energy
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What are X-Rays?.......Energy
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Two types of X-Rays
Continuous X-rays
High energy
Broad spectrum
Energy in
vs.
Characteristic X-rays
Low energy
Discrete spectrum
Energy out
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Two types of X-Rays
DETECTER
Energy
Released from the System
(Characteristic X-ray)
K
L
M
Energy
Put into the System
(Continuous X-ray)
X-ray Tube (Rh)
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Characteristic X-Rays
Types of transitions
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X-Ray Tube and Spectra
How X-Rays are generated
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SiLi Detector
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Filters
Rh creates it own
spectra
MoNi
Ag Mo Ti
EDX-720 includes: Ag, Mo,
MoNi, Ti
Sensitivity is low in Introducing a filter reduces the Rh background
these areas
Increases Sensitivity! ! !
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Filters (Cont.)
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Filters (Cont.)
Without primary filter
With primary filter
• 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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Measurement Atmosphere
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 Helium
Liquid -
Air, Helium
Powder -
Air, Helium
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Types of Analyses
Two Types of Analyses:
Qual/Quant
Quantitative
Analysis Conditions:
FP (Fundamental Parameters
Calibration Curve
Sample Form:
Bulk
Films
Filter Paper
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Hardware Accessories
Collimator Exchanger
10 mm 5 mm
CCD Camera
X,Y Positioner
X
Y
3 mm
1 mm
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Sample Turret
• Up to 16 samples
• Analysis in air
• Analysis under He/Vacuum
for lighter elements
• Continuous measurement
using a sample turret
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Sample Films and Containers
Film (Covers)