Glow In The Dark Clock Hands
The classic case of radiation poisoning. Radium was painted on the 
hands of clocks, so they would glow in the dark. The radium was 
painted by women, who had the bad habit of licking the brush tips to 
form them, ingesting the radium.

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Radioactive Record Album Dusters
Way back in ancient times, before the compact disc, primitive man 
listened to recorded music by playing large (up to a foot in 
diameter) vinyl discs with grooves engraved in them. A diamond tipped 
needle rested in the groove, and was vibrated by variations in the 
groove, corresponding to the audio being recorded. Well, enough 
ancient history... the point is dust would get on the record, and 
this was a bad thing, as it caused pops and crackles when played 
back. Rubbing the dust off was a bad idea, it would scratch the vinyl.

Radiation to the rescue! A brush was sold with trace amounts of 
polonium in it. This would create a small electrical charge on the 
brush, which would attract the dust and safely remove it from the 
record. These brushes are still sold. Polonium has a very short half 
life, so the useful life of the brush is probably a few years at the 
most. It appears that the NRC licensing requires the manufacturer to 
take back the brush, but I suspect that many of them end up in the 
trash.