Ionizing radiation takes three principal forms: alpha particles, beta particles, and gamma rays. Alpha particles are relatively large, heavy, and slow moving and cannot penetrate the skin; even a sheet of paper could block their path. But if they do manage to find their way inside the body by other means—if swallowed or inhaled—alpha particles can cause massive chromosomal damage and death. Radon 222, which gathers as a gas in unventilated basements, releases alpha particles into the lungs, where it causes cancer. Polonium 210, a powerful alpha emitter, is one of the carcinogens in cigarette
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