Radioactivity and Radiation
Craig Beals
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.
For more information:
Radiation: https://en.wikipedia.org/wiki/Radiation
Smoke detectors and radioactive Americium: https://en.wikipedia.org/wiki/Smoke_detector#Ionization
Uranium - 238: https://en.wikipedia.org/wiki/Uranium-238