2 thoughts on “Radium light switches are probably not a good idea

  1. Interesting story. For the record radium light switches die after a few years. Zinc oxide reacts with the radium to illuminate the switch. On old radium switches the zinc has fallen off and the radium does not glow anymore. However the radium will still be active for millions of years. Get a geiger counter to check, or take a UV flashlight and shine the tips of the switches in the dark, if they glow their radium.

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