Radioactive Decay & Half-life

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This website explains alpha and beta decay. It also goes a little into how far each can penetrate, along with nuclear binding energies. Website is definitely for high school or higher.


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This website introduces the object that contains almost all of the mass in the universe, the atomic nucleus. Antimatter, beta rays, fission and fusion, the structure of the atomic nucleus, how elements on the earth were produced, how we use the nucleus in every day life, and the effects of radiation in the environment are among the topics.

This page gives a good description with equation on radioactive half life. It also gives an explanation on the decay constant and how the decay equation was derived.