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What is radiotherapy?

How can materials be made radioactive?

What happens when x-rays are passed through the body?

What do x-rays and gamma rays have in common?

How are x-rays made?

What does an x-ray machine allow?

What happens when the nucleus of an atom of a radioactive substance decays?

What is radioactive tracer used for?

What is the radioactive tracer mixed with?

How is the progress of it monitored through the body?