The radioactive isotope used in the treatment of cancer has to be a good source of radiations.

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answer is C.

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Detailed Solution

Concept:
We are aware that internal organs can be treated using X-rays, gamma rays, and beta particles. As a result, we will select our response in light of the question and our level of radioactive knowledge.
When the nuclei of a radioactive atom attain an excited state, they emit and particles, which results in the production of rays. Gamma rays are utilised in radioactive tracers, medical equipment sterilisation, and the destruction of cancer cells. Radiation therapy refers to medical treatment that makes use of γ -rays.
Hence, the correct option is 3.

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