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Oil temperature gauge luminous dial.
An example of the element Radium

Sample Image
Radium Oil temperature gauge luminous dial
Oil temperature gauge luminous dial.
This oil temperature gauge is out of a WWII bomber and it has a luminous dial made with radium paint. The luminosity has faded, which is known to happen due to the deterioration of the zinc sulfide phosphor. It is still definitely radioactive (half-life of 1600 years, so it's going to be that way for a long time). It was donated by Trish Craig of the Environmental Health & Safety department at the University of Illinois at Urbana-Champaign.
Here's a great article about an object I'd sure like to find and enclose behind a huge amount of lead/

If you're interested in collecting radioactive things, here is a book I highly recommend.

Source: Trish Craig
Contributor: Trish Craig
Acquired: 28 May, 2002
Text Updated: 11 August, 2007
Price: Donated
Size: 3"
Purity: <1%
The Elements book Mad Science book Periodic Table Poster  Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here!