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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.

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Presentation Transcript
slide1

EDX-720 Training

Energy DispersiveX-ray

Fluorescence Spectrometer

Energy DispersiveX-ray

Fluorescence Spectrometer

slide2

An Atom

Electrons

Nucleus:

Protons

Neutrons

K

L

M

Orbital or shell

slide3

Atoms & Energy

Atoms can absorb and release energy using electrons

Atoms absorb energy by promoting an electron to a higher energy orbital

Atoms release energy by demoting electrons to a lower energy orbital

K

L

M

Energy

slide4

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

X-Rays Are a Type of Electromagnetic Wave

Also Light or Energy

slide5

Two types of X-Rays

Continuous X-rays vs. Characteristic X-rays

Low energy

Discrete spectrum

Energy out

High energy

Broad spectrum

Energy in

slide6

Two types of X-Rays

DETECTER

Energy

Released from the System

(Characteristic X-ray)

Energy

Put into the System

(Continuous X-ray)

K

L

M

X-ray Tube (Rh)

slide7

Characteristic X-Rays

Types of transitions

slide8

X-Ray Tube and Spectra

How X-Rays are generated

slide10

Filters

MoNi

Ag

Mo

Ti

EDX-720 includes: Ag, Mo, MoNi, Ti

Rh creates it own spectra

Sensitivity is low in these areas

Introducing a filter reduces the Rh background

Increases Sensitivity! ! !

slide12

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
slide13

Intensity vs. Matrix

Intensity and Density are inversely related

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

slide14

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
slide15

Types of Analyses

Two Types of Analyses:

Qual/Quant

Quantitative

Analysis Conditions:

FP (Fundamental Parameters

Calibration Curve

Sample Form:

Bulk

Films

Filter Paper

slide16

Hardware Accessories

Collimator Exchanger

10 mm 5 mm 3 mm 1 mm

CCD Camera

X,Y Positioner

X

Y

slide17

Sample Turret

  • Up to 16 samples
  • Analysis in air
  • Analysis under He/Vacuum for lighter elements
  • Continuous measurement using a sample turret