Home ยป Which radioactive element is used in the treatment of cancer? Atomic Structure MCQs Which radioactive element is used in the treatment of cancer? January 8, 2022 17 Views Q. Which radioactive element is used in the treatment of cancer? A. Iodine-131 B. Uranium-234 C. Plutonium-239 D. Cobalt-60 Answer: Cobalt-60