7.13 describe the uses of radioactivity in medical and non-medical tracers, in radiotherapy, and in the radioactive dating of archaeological specimens and rocks
Radioactive isotopes are used as tracers to help doctors indentify diseased organs. The tracer is swallowed by the patient. Inside the body, it emits gamma ray which is traced outside by GM-tube and the disease can be detected.
Radioactive isotopes are also used in treatment of cancer. Cancerous cells are targeted and emitted beta ray which kills the cancer cells inside the body.
Every substances contains little amount of radioactivity. Ancient object’s radioactivity is measured and archeologist tells the age of the object.