Which statements describe the use of gamma rays to treat cancer? Check all that apply.Gamma rays have low energy and a source must be placed in the body.Gamma rays are absorbed by only the cancer cells.High-energy gamma rays are directed at a tumor from outside of the body.Gamma rays kill cancer cells in a tumor.Gamma rays are applied to a large area of the body.

Cancer radiotherapy uses high-energy gamma rays aimed at a tumor from outside the body, so C is correct. The radiation damages and kills cancer cells in the tumor, making D correct. Gamma rays are not absorbed only by cancer cells, and treatment is targeted rather than applied to a large area; a low-energy source placed inside the body does not describe this use.

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