Craig Beals explains why some atoms emit radiation through the processes of radioactivity and radioactive decay. He examines the role of isotopes in radiation and shows Uranium - 238 from Carnotite Ore and Americium - 241 from a smoke detector.
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This video is only for entertainment purposes. If you rely on the information outlined in this video, you assume responsibility for the results. As with any experiment, proceed at your own risk.
Smoke detectors and radioactive Americium: https://en.wikipedia.org/wiki/Smoke_detector#Ionization
Uranium - 238: https://en.wikipedia.org/wiki/Uranium-238