Cobalt-60 is commonly used in radiation therapy because it emits

Alpha rays

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Beta rays

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Gamma rays

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X-rays

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Solution

The correct option is A Gamma rays
The most common radioactive isotope of cobalt is cobalt-60. It is an important gamma-emitting radionuclide produced as a fission product. The gamma ray (photon) energy can be used in radiotherapy such as for the treatment of cancer, in food irradiation, or in industrial gauges or sensors. Cobalt-60 is used in the radiotherapy of cancer. Cobalt-60 tends to be used in teletherapy units as a higher photon energy alternative to caesium-137.
Therefore, the correct answer is option C.

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