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The answer sought here might be ionizing radiation. Ionizing radiation comes in a couple of "flavors" as we know it. One is particulate radiation, and it involves a particle of some kind. The other is electromagnetic radiation, and it involves a "ray" or the like. Radon undergoes what is called radioactive or nuclear decay. 222Rn, the isotope of concern with radon, emits an alpha particle to decay. The alpha particle is two protons and two neutrons - a helium nucleus. This particle has very poor penetrating power. A sheet of paper will stop it. But radon is an inert gas, and if a person breathes in radon, even in small quantities, the alpha decay of radon in the lungs exposes soft tissue to terrible biological damage from the alpha particles. What's worse, the radon becomes polonium - another radioactive substance. Radon that is inhaled and undergoes radioactive (alpha) decay in the lungs has 7 more radioactive decays to go before becoming a stable isotope of lead. And each decay event further exposes local (and the same) tissue to heavy biological damage. Radon causes more lung cancer than most individuals know about.

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