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Alpha particles have a mass of 4 amu and a charge of +2, while beta particles have a mass of 1/1800 amu and a charge of -1. As a result, alpha particles are much more likely than beta particles to interact with matter, making it very difficult for them to penetrate anything.

Unfortunately, because of their high ionization (interaction) rate, alpha particles are more damaging when they are in close contact with sensitive tissues, such as when alpha emitting materials are ingested. They can be stopped with a few inches of air, a sheet of paper, or even your skin; but inhale or swallow the parent material, and all bets are off, sorry.

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How does the penetrating ability of gamma rays compare with that of alpha particles and beta particles?

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