eli5: Why is lead used as a radioactive shielding?

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eli5: Why is lead used as a radioactive shielding?

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Lead is very dense and very cheap. You block radiation by having so much mass in the way that any particle or ray is sure to hit an atom and get bounced off or absorbed. Because of lead’s properties, it’s the most sensible material for putting a lot of big atoms between you and the radioactive source.

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