About MDCB

The Medical Dosimetry Certification Board (MDCB) was formally incorporated in 1988. The MDCB is the recognized certifying agency for Medical Dosimetry in the United States and administers the Medical Dosimetry Certification Exam. By 1991, the exam was administered annually in 15 test sites in major cities in the United States and Canada. Since 2012, the exam is administered twice annually.

Medical Dosimetrists from countries outside the United States and Canada recognized the importance of certification. and elected to become certified by the MDCB under Route Two and Three eligibility requirements beginning in 2008, when the exam was offered in Hong Kong and South Korea whenever there was a minimum of ten candidates for any site. In 2011, a computer-based exam became available in well over 100 sites outside North America and was available to candidates from the Far East, the Middle East, Australia and Europe.

In 2017, the routes to eligibility changed. Only one standard of eligibility was available for all US applicants, requiring a Bachelor's Degree and graduation from a formal Dosimetry program accredited by the JRCERT. For applicants practicing outside the US, an International application was provided. By 2023, it became evident that the MDCB's mandate to provide procedural fairness for all applicants could not be achieved. Therefore, the MDCB made the decision to terminate the international eligibility route to sit for the CMD examination after the September 2025 administration.

Following a rigorous application process, the MDCB was granted National Commission for Certifying Agencies (NCCA) accreditation. The NCCA is the certifying body of the Institute for Credentialing Excellence (ICE). The mission of the NCCA is to help ensure the health, welfare and safety of the public through the accreditation of certification programs and organizations that assess professional proficiency.

Each of the various disciplines represented by the MDCB board members — Dosimetry, Medical Physics and Radiation Oncology — is an important component in the development of the MDCB Certification Exam. Through their collaboration and the psychometric expertise provided by our test vendor, the MDCB ensures that the exam continues to consistently measure the knowledge and experience of dosimetrists, assuring quality of care and the safety and health of patients.