  X-Ray tube with window. 
This is a complete x-ray tube with a chromium target and three beryllium windows (used because beryllium is largely transparent to x-rays).  See a few samples back for an example of one of the windows removed from a similar tube. 
Source: eBay seller allthedodaday 
Contributor: Theodore Gray 
Acquired: 2 November, 2004 
Text Updated: 11 March, 2007 
Price: $24 
Size: 0.5" 
Purity: 99% 
Sample Group: Medical
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