skip to main content
RadInfo Logo Home

Professions in Radiation Therapy

Radiation Oncologist

Radiation oncologists are physicians who oversee the care of each cancer patient undergoing radiation treatment. After determining whether a patient is a candidate for radiation therapy, they review the side effects and benefits of treatment with the patient. Next, they develop and prescribe each cancer patient's radiation treatment plan and make sure that every treatment is accurately given. They monitor the patient's progress and adjust treatment to make sure patients receive quality care. Radiation oncologists also help identify and treat any side effects of radiation therapy. They work closely with other physicians and all members of the radiation oncology team. Radiation oncologists have completed four years of college, four years of medical school, one year of general medical training, then four years of residency (specialty) training in radiation oncology. They have extensive training in the safe use of radiation to treat disease. If they pass a special examination, they are certified by the American Board of Radiology. They participate in maintenance of certification, a process that ensures that they are up to date on advances in the field. Patients should ask if their doctor is board certified.

Therapeutic Medical Physicist

A therapeutic medical physicist is a qualified medical physicist who works directly with the doctor in treatment planning and delivery. Therapeutic medical physicists oversee the work of dosimetrists and help ensure that complex treatments are properly tailored for each patient. They are responsible for developing and directing quality control programs for equipment and procedures that ensure the equipment works properly. They also take precise measurements of radiation beam characteristics and do other safety tests on a regular basis. Therapeutic medical physicists have doctorates or master's degrees and have completed four years of college, two to four years of graduate school and typically one to two years of clinical physics training. If they pass a special examination, they are certified by the American Board of Radiology or the American Board of Medical Physics. They participate in maintenance of certification, a process that ensures that they are up to date on advances in the field.

Radiation Therapist

Radiation therapists work with radiation oncologists. They administer the daily radiation treatment under the doctor's prescription and supervision. They maintain daily records and regularly check the treatment machines to make sure they are working properly. Radiation therapists go through a two- to four-year educational program following high school or college. They take a special examination and must be certified by the American Registry of Radiologic Technologists. In addition, many states require that radiation therapists be licensed.


Dosimetrists use treatment planning software to help the radiation oncologist develop a treatment plan for a patient. Contours are created for normal tissues, such as the lungs or liver and for tumor structures and other areas at risk for harboring cancer cells. They then calculate the dose of radiation that will be delivered to these contoured structures to make sure that the tumor gets enough radiation to destroy it while spares the normal tissues. There are generally accepted guidelines (dose constraints) for the amount of radiation that a particular organ can tolerate. Many of these treatment plans are very complex. Dosimetrists work with the radiation oncologist and the medical physicist to create the treatment plan that is best suited to each patient. Final decisions regarding the treatment plan are made by the radiation oncologist. Many dosimetrists start as radiation therapists and with intensive training, become medical dosimetrists. Others are graduates of one- to two-year dosimetry programs. The Medical Dosimetrist Certification Board certifies dosimetrists.

Radiation Oncology Nurse

Nurses work with the radiation team to care for patients during the course of treatment. They help evaluate the patient before treatment begins. They may talk to the patient about potential side effects and their management. During the course of radiation treatments, the nurse may evaluate the patient weekly or more frequently to assess problems and concerns. Nurses play a key role in educating the patient about treatment, side effects, etc. Radiation oncology nurses are registered nurses licensed to practice professional nursing. Most nurses in radiation therapy have additional accreditation in the specialty of oncology nursing. Advanced practice nurses in oncology, which include clinical nurse specialists and nurse practitioners, have completed a master's degree program.

Social Worker

Social workers may be available to provide practical help and counseling to patients or members of their families. They can help a patient and their family members cope with the stressors associated with a cancer diagnosis. They also may help arrange for home health care and other services. Social workers may be licensed. Licensed social workers must have a master's degree and pass an examination.


Dietitians work with patients to help maintain nutrition. They monitor the patient's weight and identify any nutritional problems. Dietitians educate patients and may provide them with recipes and nutritional supplements to improve their nutritional status before, during and after treatment. Dietitians attend four years of college then usually take part in a one-year internship. The American Dietetic Association registers dietitians who have passed a professional examination.

This page was reviewed on March 15, 2023


Patient being prepped for radiation therapy. View full size with caption

Sponsored By

Please note is not a medical facility. Please contact your physician with specific medical questions or for a referral to a radiologist or other physician. To locate a medical imaging or radiation oncology provider in your community, you can search the ACR-accredited facilities database.

This website does not provide cost information. The costs for specific medical imaging tests, treatments and procedures may vary by geographic region. Discuss the fees associated with your prescribed procedure with your doctor, the medical facility staff and/or your insurance provider to get a better understanding of the possible charges you will incur.

Web page review process: This Web page is reviewed regularly by a physician with expertise in the medical area presented and is further reviewed by committees from the Radiological Society of North America (RSNA) and the American College of Radiology (ACR), comprising physicians with expertise in several radiologic areas.

Outside links: For the convenience of our users, provides links to relevant websites., RSNA and ACR are not responsible for the content contained on the web pages found at these links.