Beta particles are smaller and faster moving than alpha particles and can penetrate more deeply into living tissue, causing visible burns on the skin and lasting genetic damage. A piece of paper won’t provide protection from beta particles, but aluminum foil—or separation by sufficient distance—will. Beyond a range of ten feet, beta particles can cause little damage, but they prove dangerous if ingested in any way. Mistaken by the body for essential elements, beta-emitting radioisotopes can become fatally concentrated in specific organs: strontium 90, a member of the same chemical family as
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