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It depends on what kind of radiation...

Alpha radiation can be stopped with a sheet of paper or a few inches of air.

Beta radiation can be stopped with a thin sheet of metal.

Neutron radiation, depending on energy, requires large thicknesses of lead or concrete.

Gamma radiation, depending on energy, also requires large thicknesses of lead or concrete. Some of the higher energy gammas, such as cosmic rays, can be quite difficult to stop at all.

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13y ago

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