Vintage radioactive wrist watches
Vintage watches from the 1910-1920 era could use a paint based on radioactive material like Radium to excite another fluorescent material in order to emit light.This paint was used on watches hands and dials like this one:
Building a Geiger counter based on a SBM-20 GM tube and a popular arduino project:
Testing the Radium from the watches hands - 6798CPM and counting...
Slightly radioactive CRT:
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