A type of atom that is unstable and prone to break up (decay). Decay releases small fragments of atoms and energy. Exposure to certain radioisotopes can cause cancer. Use of radioisotopes under controlled conditions can be used to treat cancer. In certain imaging procedures, radioisotopes are injected. They travel through the body and collect in areas where the disease is active, showing up as highlighted areas on the images. In breast cancer, radioisotopes are used to check for metastasis to the bones.
Tags: Cancer Dictionary, R