The occupation, 'Radiation Therapists', include: Chief Radiation Therapist (Chief RT), Computed Tomography Simulation Therapist (CT Simulation Therapist), Dosimetrist, Lead Radiation Therapist, Medical Dosimetrist, and other titles.Radiation Therapists provide radiation therapy to patients as prescribed by a radiologist according to established practices and standards. duties may include reviewing prescription and diagnosis; acting as liaison with physician and supportive care personnel; preparing equipment, such as immobilization, treatment, and protection devices; and maintaining records, reports, and files. may assist in dosimetry procedures and tumor localization.