Difference between revisions of "SEM EDS"
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| − | | || EDAX || Genesis Spectrum || 2006 || || || || [http://siliconpr0n.org/media/edax/genesis/GenEDS.pdf Yes] || || [http://siliconpr0n.org/media/edax/genesis/ Yes] | | + | | || EDAX || Genesis Spectrum || 2006 || || || || [http://siliconpr0n.org/media/edax/genesis/GenEDS.pdf Yes] || || [http://siliconpr0n.org/media/edax/genesis/ Yes] || |
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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:
- EDAX
- Website]
- Oxford Instruments
- Website]
- Noran Instruments (now Thermo Scientific)
- Princeton Gamma-Tech (PGT, now Thermo Scientific)
- Bruker
- Website]
- Evex (Kevex?)
- "To enjoy this site you'll need to update your Flash Player. It's easy, painless and will take just a moment… "
- haha never buying your products
- Link Analytical
- e2v Sirius
Typical systme:
- Thin window (Be, C, B)
- SiLi crystal
- FET pre-amplifier
- Vacuum
- Cold finger
- Pre-amplifier
- Amplifier
- MDA electronics (“multi channel analyzer”)
Contents
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:
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
- [2]
- Has a nice CAD drawing explaining the components of real EDS detectors
- Beam MicroAnalysis-Geol_619-8.ppt
