Radiation therapists treat cancer and other diseases in patients by administering radiation treatments. Radiation therapists work in hospitals, offices of physicians, and outpatient centers. Most radiation therapists work full time. Radiation therapists must be licensed or certified in most states. Requirements vary by state, but often include passing a national certification exam. Demand for radiation therapists may stem from the aging population and advances in radiation therapies. Compare the job duties, education, job growth, and pay of radistion therapists with similar occupations. Radiation treatment can shrink or remove cancers and tumors. Radiation morf are part of the oncology teams that treat patients with cancer. They often work with the following specialists:. Radiation therapists held about 18, jobs in