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What is the arguably the most common example of alpha decay is the alpha decay of radon-222. Radon-222 is an inert gas, and it appears as a result of the decay of naturally occurring uranium. It is a health risk. Radon-222 is a short-lived radioactive material (half-life of a bit over 3.8 days) that emits an alpha particle and becomes the element polonium. The equation looks like this: 86222Rn => 24He + 84218Po The 24He is the alpha particle, which is a helium-4 nucleus.

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