<prompt> Which one of the following is NOT true concerning Radon?Decays by gamma emissionSingle largest contributor to an individuals background radiation doseMost stable isotope, 222Rn, has a half-life of 3.8 daysImplicated in Lung cancer  <response>: Radon Radioactive, colorless, odorless, tasteless noble gas, occurring naturally as the decay product of uranium or thorium. Its most stable isotope, 222Rn, has a half-life of 3.8 days. Often the single largest contributor to an individuals background radiation dose Radon continues to decay to emit alpha paicles. Rn-222 represents a long-term hazard despite its sho half life of 3.8 days. 