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3D3DThick disk of solid beryllium.
This is a slice of pure beryllium, probably x-ray grade meaning pure enough to allow x-rays through. Not cheap at all, no sir, not cheap.
Source: eBay seller chifizica
Contributor: Theodore Gray
Acquired: 15 April, 2009
Text Updated: 15 April, 2009
Price: $430
Size: 6"
Purity: >99%