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Radiation therapists typically do the following: Explain treatment plans to the patient and answer questions about treatment Follow safety procedures to protect the patient and themselves from overexposure to radiation Examine machines to make sure they are safe and working properly X ray the patient to determine the exact location of the area requiring treatment Check computer programs to make sure the machine will give the correct dose of radiation to the appropriate area of the patient's body Operate the machine to treat the patient with radiation Monitor the patient to check for unusual reactions to the treatment Keep detailed records of treatment Machines called linear accelerators are used to deliver radiation therapy. These machines direct high-energy x rays at specific cancer cells in a patient's body, shrinking or removing them.