Cobalt therapy is the medical use of ____________ rays from the radioisotope cobalt-60 to treat conditions such as cancer.

gamma

The correct answer is option 3. gamma.

Cobalt therapy is the medical use of gamma rays.

Cobalt therapy involves the use of gamma rays emitted by the radioisotope cobalt-60 (60Co) to treat conditions such as cancer. Gamma rays are a type of ionizing radiation that can penetrate deep into tissues, making them effective for targeting and destroying cancerous cells during radiation therapy.