  X-ray window sheet. 
X-rays are generated by accelerating electrons in a vacuum tube: When they strike a target at the positive side of the tube, x-rays are emitted.  The problem then is how to let the x-rays out of the tube without letting air in.  The answer is a beryllium window.  Beryllium is virtually transparent to x-rays, but impervious to air.  This is a sheet of beryllium from which several round pieces have been punched to make x-ray windows. 
Source: Juan Jimenez 
Contributor: Juan Jimenez 
Acquired: 6 April, 2007 
Text Updated: 6 April, 2007 
Price: Donated 
Size: 3" 
Purity: >99%
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