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Energy Dispersive X-ray

Fluorescence Spectrometer

Energy Dispersive X-ray

Fluorescence Spectrometer

EDX-720 Training


KL

M

An Atom

Electrons

Nucleus:

ProtonsNeutrons

Orbital or shell


KL

M

Atoms & Energy

Atoms can absorb and release energy using electrons

Atoms absorb energy by promoting an electron to a

higher energy orbital

Energy

Atoms release energy by demoting electrons to a

lower energy orbital


X-Rays Are a Type of Electromagnetic Wave Also Light or Energy

What are X-Rays?.......Energy


Two types of X-Rays

Continuous X-rays vs. Characteristic X-rays

High energyBroad spectrumEnergy in

Low energyDiscrete spectrumEnergy out


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


Characteristic X-Rays

Types of transitions


X-Ray Tube and Spectra

How X-Rays are generated


SiLi Detector


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

Mo

Ni

Filters


Filters (Cont.)


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


Intensity vs. Matrix

Intensity and Density are inversely related

Density affects the analyte’s ability to Fluoresce through the matrix


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

Measurement Atmosphere


Types of Analyses

Two Types of Analyses:

Qual/Quant Quantitative

Analysis Conditions:

FP (Fundamental ParametersCalibration Curve

Sample Form:

BulkFilmsFilter Paper


10 mm 5 mm 3 mm 1 mm

CCD Camera

X

Y

X,Y Positioner

Collimator ExchangerHardware Accessories


• Up to 16 samples

• Analysis in air

• Analysis under He/Vacuum for lighter elements

• Continuous measurement using a sample turret

Sample Turret


Film (Covers)

Sample Films and Containers

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