Radiology Which one of the following is NOT true concerning Radon? A Decays by gamma emission B Single largest contributor to an individual's background radiation dose C Most stable isotope, 222Rn, has a half-life of 3.8 days D Implicated in Lung cancer 💡 Explanation Which one of the following is NOT true concerning Radon? ✓ Correct Answer: A. Decays by gamma emission