Which statements best describe medical uses for radioactive isotopes? Check all that apply.Radioactive isotopes are used to detect medical problems.High-energy gamma rays are injected into the body.Radioactive isotopes are used to treat some diseases.Radiation is used to kill cancer cells.Radioactive isotopes are directed at tumors from outside the body.

Radioactive isotopes can act as tracers that help doctors detect medical problems, and some are used to treat disease. Radiation can also be used to kill cancer cells. Gamma rays themselves are not injected into the body; a radioactive substance may be administered, and its radiation is detected or used for treatment. Radiation aimed at tumors from outside the body is not an isotope being directed at them.

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