Description : The noble gas used in radiotherapy is (1) neon (2) argon (3) radon (4) xenon
Last Answer : (3) radon Explanation: An early-20th-century form of quackery was the treatment of maladies in a radiotorium. It was a small, sealed room for patients to be exposed to radon for its " ... , which results in genetic and other cell damage, resulting in increased rates of illness, including cancer.