Advanced Tinkering, presented video that will show ionizing radiation, visible to the naked eye. For this, the author built the largest compressor-cooled continuous cloud chamber ever built by a private person (as far as he knows that is). The chamber system can run continuously without needing to be refilled.
Graphic from this Source of also possible interest (here).
The cloud chamber show short alpha rays (that can be stopped by a piece of paper), beta rays (that can be stopped by a sheet of aluminum), and gamma rays that can penetrate almost anything coming from the Sun and Cosmos, and pieces of uranium ore, (the rays of which dies away after a few feet).
[See Dr. Conca for more on radioactivity: (here) and (here).]
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