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Many antiques actively exploit the radioactive properties of radionuclides:
* clocks, watches, and instrument dials that glow in the dark, may contain radium or tritium
* ceramics (specifically old Fiestaware®) get their color from the addition of various radionuclides to their glaze
* vaseline or canary glass contains small amounts of uranium, which provide it's yellow-green coloring and also makes it glow under black lights.
These items emit small amounts of radiation, but enough to register on a hand-held Geiger Counter.SOURCE