EDAX or energy dispersive x-ray analysis is a technique used to identify the elemental composition of a specimen. It works as part of a scanning electron microscope by using an electron beam that excites electrons in an atom, ejecting them and creating an x-ray. The x-rays are measured by an energy-dispersive spectrometer to determine the number and energy of the x-rays emitted from the specimen. The EDAX instrument consists of an electron beam source, x-ray detector, analyzer, and pulse processor which work together to collect and analyze the x-rays for elemental analysis of materials. EDAX has applications in fields like medicine, industry, agriculture, and more.

1. Energy Dispersive X-ray
Analysis (EDAX )
Presented by -
RUSHIKESH G PARIT
ANNAPA I PATIL
DR.GHALI COLLEGE GADHINGLAJ

2. CONTENTS
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Introduction
Principal
Instrumentation
Application

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EDX Analysis stands for Energy Dispersive X-ray analysis.
It is sometimes referred to also as EDS or EDAX analysis.
It is a technique used for identifying the elemental
composition of the specimen
The EDX analysis system works as an integrated feature
of a scanning electron microscope (SEM).
EDAX is an analytical method used for analytical or
chemical characterization of material
Introduction

4.  The incident beam may excite an electron in an inner shell,
ejecting it from the shell while creating an electron hole
where the electron was.
PRINCIPAL
 An electron from an outer,
higher-energy shell then fills
the hole, and the difference in
energy between the higher-
energy shell and the lower
energy shell may be released
in the form of an X-ray.
The number and energy of the X-rays
emitted from a specimen can be
measured by an energy-dispersive
spectrometer.

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EDAX instrument is mainly composed of four components:
Electron beam source
X-ray Detector
Analyzer
Pulse Processor
INSTRUMENTATION

7. Instrumentation and Working (EDAX)

8. Brief Description of Components
A) Electron beam source
1) As like EDS and SEM Electron gun is used as the incident Electron source and
to focus the beam lenses are used along with aperture
2) The energy of the Electron beam has to be carefully selected to overcome the
compromise between the resolution requirements and the production of X rays
3) produced X rays are detected by two crystal spectrophotometers
B) X-ray Detector:
1)The X-rays counts (which is the abundance of emitted X-rays) versus X-rays
energies are measured by the EDS detector.
2) Detector is a solid state device which is based on lithium drifted silicon.
3) As X−rays strike the surface of the detector, a charge pulse is created.
4)This charge pulse is directly proportional to theenergy of the incident X−ray.

9. a) Collimator assembly :
1) The purpose of the
collimator is to provide
restrictive aperture ,
through which X- Ray's
should pass in order to
make a way to detector.
2) The collimator
ensures that only x-rays
from the region being
excited by the beam of
electrons are detected.
Parts Of Detector

10. b) Electron Trap :
1) The purpose of the Electron Trap is to guarantee that only x -
rays should enter the detector.
2) It has pair of permanent magnets to strongly deflect the
passing electrons.

11. c) Windows :
1) It is made up of
Beryllium.
2) The purpose of
Windows is to provide
isolation from the
microscope chamber
to maintain vacuum
inside the detector.

12. f) Cryostat :
1) The EDXA detector is a self enclosed vacuum system ( called
cryostat) with liquid Nitrogen or Cryogenic pumping.
2) The charge signals
generated by detector are
small and can only be
separated from the electronic
noise of detector , if the noise
is reduced by cooling the
crystal and FET.
3) At low voltage the
resolution of the detector
depends upon the noise .
4) Xray peaks are typically
2-10 eV wide.

13. G) Pulse Processor :
1) A charge sensitive preamplifier is
employed to convert charge pulse to
a voltage pulse.

14. H)Analyzer:
1) Multichannel Analyzer used to collect the data
from the pulse processor and displays it as a
Histogram of intensity (ie. Number of counts ) V/S
voltage.

15. Application
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Study of microorganism like bacteria viruses and
pathogen have made of the treatment disease very
effective
Use to study the topography of element used in
industries
Used to analysis of lead base paint
Agriculture - trace metal analysis in soil and
agriculture product
Quantitative and qualitative analysis of surface