Difference between revisions of "SEM EDS"

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Styles
 
Styles
  
** Si-Li
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* Si-Li
** Silicon Drift Detector (SDD)
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* Silicon Drift Detector (SDD)
  
 
== Si-Li ==
 
== Si-Li ==
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{| class="wikitable sortable" border=1
 
{| class="wikitable sortable" border=1
!Image !!Vendor !!Model !!Year !!Features !!List price !!Ask price !!Manual !!Schem !!SW !!Notes |
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!Image !!Vendor !!Model !!Year !!Features !!List price !!Ask price !!Manual !!Schem !!SW !!Notes
 
|-
 
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|    || EDAX  || Genesis Spectrum  || 2006  ||    ||    ||    || [http://siliconpr0n.org/media/edax/genesis/GenEDS.pdf Yes]]  ||    || [[http://siliconpr0n.org/media/edax/genesis/ Yes]]  |   ]
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|    || EDAX  || Genesis Spectrum  || 2006  ||    ||    ||    || [http://siliconpr0n.org/media/edax/genesis/GenEDS.pdf Yes]  ||    || [http://siliconpr0n.org/media/edax/genesis/ Yes]  ||
 
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= References =
 
= References =
  
**  [http:''www.charfac.umn.edu/instruments/eds_on_sem_primer.pdf http://www.charfac.umn.edu/instruments/eds_on_sem_primer.pdf]]]
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**  [http://www.charfac.umn.edu/instruments/eds_on_sem_primer.pdf]
 
** Has a nice CAD drawing explaining the components of real EDS detectors
 
** Has a nice CAD drawing explaining the components of real EDS detectors
** [http:''epmalab.uoregon.edu/pdfs/Electron Beam MicroAnalysis-Geol_619-8.ppt http://epmalab.uoregon.edu/pdfs/Electron Beam MicroAnalysis-Geol_619-8.ppt]]]
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** [http://epmalab.uoregon.edu/pdfs/Electron Beam MicroAnalysis-Geol_619-8.ppt]
 
 
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Latest revision as of 05:56, 25 December 2018


"Energy-dispersive X-ray spectroscopy (EDS, EDX, or XEDS)"

List of EDS manufacturers:

Typical systme:

    • Thin window (Be, C, B)
    • SiLi crystal
    • FET pre-amplifier
    • Vacuum
    • Cold finger
    • Pre-amplifier
    • Amplifier
    • MDA electronics (“multi channel analyzer”)

Detector

Styles

  • Si-Li
  • Silicon Drift Detector (SDD)

Si-Li

Operates at LN2 temps. If operated at room temp it will be destroyed

SDD

"SDD detectors operate at a few tens of degrees below zero"

Window

Styles [epmalab]:

    • Be foil
    • Supported window
    • Windowless

Be foil

"The most common EDS detector window has been made of Be foil ~7.6 um (0.3 mil) thick. It allows good transmission of X-rays above ~ 1 keV. It is strong enough to withstand venting to atmospheric pressure, and opaque to optical photons." [epmalab]

Supported window

"For transmission of light element X-rays (<1 keV), windows ~0.25 um thick of BN, SiN, diamond or polymer are used. They must use supporting grids to withstand pressure differentials; the grid (e.g., Si or Ni) takes up about 15% of the area, but thin enough that low energy X-rays pass through." [epmalab]

Ultra Thin Window (UTW)

made of:

    • Polymide ref]
    • "poly-vinyl formal (FORMVAR), butvar, parylene, kevlar, polypropylene, lexan or polyimide" ref]

Windowless

"no film, and there is a turret that allows swapping with a Be window. Difficult to use as oil or ice can coat the detector surface" [epmalab]

Gamma Spectacular

[1]]

How hard would it be to use this as EDS controller?

Model comparison

Image Vendor Model Year Features List price Ask price Manual Schem SW Notes
EDAX Genesis Spectrum 2006 Yes Yes


References