Intact smoke detector.
This is the outer casing of the ionization chamber inside an ordinary smoke detector, along with the text from the label on the back indicating its Americium content. Even though it's not radioactive on the outside, I've got it stored in the Hot Box.
Source: Hardware Store
Contributor: Theodore Gray
Acquired: 18 August, 2002
Price: $10/smoke detector
Size: 1.25"
Purity: >90%
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