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.
Hyperphysics
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Need to study for Physics? Here are some questions to help you out!!!
StudyStack
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Table of known isotopes with decay path and percent abundance.
Lawrence Berkeley National Laboratory
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Explanation of half-life, including a Java simulation.
University of Colorado Physics
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