radioactive poisons

What Makes a Substance Radioactive?

A substance is considered radioactive if it contains unstable atomic nuclei that decay over time, releasing ionizing radiation. This decay process can emit alpha particles, beta particles, or gamma rays, each having distinct penetrating powers and biological impacts. For instance, alpha particles, though heavy, can be stopped by a sheet of paper, while gamma rays require dense materials like lead for shielding due to their high penetration ability.

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