  Modern Spinthariscope.
This is a really nice modern spinthariscope made by United Nuclear, my favorite supplier for all things radioactive and chemical. It uses a small amount of uranium ore, a highly efficient luminous screen, and a quality lens to provide a better view than any of the antique spinthariscopes I've tried.
Spinthariscopes are not just historical curiosities, you can order one like this today.
Spinthariscopes are explained in more detail here.
Source: United Nuclear
Contributor: United Nuclear
Acquired: 19 May, 2007
Text Updated: 19 May, 2007
Price: $30
Size: 2.5"
Purity: <1%
Sample Group: Spinthariscopes
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