In radiation oncology, physicists work closely with radiation therapists and radiation oncologists to ensure the safe, accurate and effective delivery of radiation therapy. Responsibilities include: 

• Equipment usage, selection and replacement,
• Ongoing review and development of radiation treatment planning and delivery.
• Keep abreast of best practice in the literature and implementing updates where appropriate in a timely fashion.
• Review patient treatment plans, make recommendations on how to best treat patients.
• Develop and maintain the quality control program in radiation therapy.  The QC program is crucial to the successful treatment of patients and supports the safe and accurate delivery of radiation therapy. Physicists work with medical physics assistants to develop and maintain accurate procedures and comprehensive documentation for QA program and clinical projects; complete QA measurements and analysis; identify and rectify malfunctions or parameters found to be operating outside of tolerance with Radiation Therapy Equipment Service Specialist and/or vendors; return equipment to clinical service.
• Performance specification, acceptance testing and commissioning of new equipment, as well as calibration of the sources and maintenance of all information necessary for their appropriate use.

1. THE AMERICAN BOARD OF RADIOLOGY (ABR) certifies physicists in the specialties of:
   • Therapeutic Radiological Physics
   • Radiological Physics
   • Roentgen Ray Physics
      
2. Certification by the ABR includes examination in clinical aspects of medical physics, medical radiological equipment and instrumentation, and radiation safety.
    
3. THE AMERICAN BOARD OF MEDICAL PHYSICS (ABMP) certifies physicists in:
   • Radiation Oncology Physics
   • Hyperthermia Physics
   • Medical Radiation Protection [for radiation safety]
      
4. Certification by the ABMP includes examination in clinical aspects of medical physics, appropriate equipment, instrumentation, and radiation safety.
    
5. THE CANADIAN COLLEGE OF MEDICAL PHYSICS (CCMP) certifies physicists in Radiation Oncology Physics, Diagnostic Radiological Physics, Magnetic Resonance Imaging, Nuclear Medicine Physics. https://ccpm.ca/
    
6. THE AMERICAN BOARD OF HEALTH PHYSICS (ABHP) certifies physicists in:
   • Comprehensive Health Physics [for radiation safety] Following the policy outlined in the AAPM statement, only those persons certified by the ABR in Therapeutic Radiological Physics or Radiological Physics, The Canadian College of Medical Physics, or by the ABMP in Radiation Oncology Physics, can be assumed competent to function independently in a clinical situation. Certification by the ABHP or by the ABMP in Medical Radiation Protection indicates competence only in radiation safety aspects of radiation oncology, and not in the practice of radiation oncology physics. Participation in a post-graduate training program and practical experience alone do not imply competency.