Radioactive screen.
I'm pretty sure this screen was made by gluing the same ore described in the previous sample onto some cardboard. The manual that came with the chemistry set this was in (see previous sample description) has instructions for how to use the screen to expose photographic film.
Source: eBay seller 6tomcat
Contributor: Theodore Gray
Acquired: 10 January, 2003
Price: $58/chemistry set
Size: 1"
Purity: <1%
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