|Dec8-11, 12:08 PM||#1|
X ray questions:What material is suitable in windows for hard X-rays?
What material is suitable in windows for hard X-rays?
What material would you choose as reflective coating of X-rays mirrors for radiation at 200 eV? Why?
|Feb24-12, 03:26 PM||#2|
Hmm, 200 eV is very very soft. The only window you can use for that is a free-stainding SiN membrane one a Si frame (substrate with a small window etched into it). These are commercially available, up to maybe a few window mm size.
A window is always a compromise of thickness and the material's absorption length. The latter depends on Z. Generally speaking you want Z as low as you can get, but the material has to withstand possible radiation damage.
For x-rays above 3.5keV or so you can use Beryllium (Z= 4 for large pieces) or CVD diamond (Z=6 for smaller pieces). For hard x-rays above 20keV or so you can use Al, plastics or even Si wafers.
For 200 eV I would use a naked Si mirror without any coating. The critical angle at 200 eV is large enough, and Si you can get in excellent quality.
Check out the Center for X-Ray Optics. There you can calculate transmission and reflectivity of softish X-rays.
|Similar Threads for: X ray questions:What material is suitable in windows for hard X-rays?|
|Looking for a Material Suitable for Secondary glazing||Materials & Chemical Engineering||0|
|Is there a certain material that absorbs X-Rays so that the X-Rays don't escape||Nuclear Engineering||1|
|Suitable material||Engineering Systems & Design||1|
|Turned my Laptop hard-drive for windows into a external hard drive,||Computers||3|
|What Could Delete Windows from a Hard Drive?||Computing & Technology||9|