The Medical Dosimetrist Certification Board (MDCB) enhances quality patient care by credentialing and establishing continuing education standards for those in the Medical Dosimetry profession. The MDCB exam has been administered since 1988 and remains dedicated to the validation of knowledge for Certified Medical Dosimetrists (CMD). The Certification exam follows strict guidelines set forth by the National Commission for Certifying Agencies (NCCA). This certification is offered internationally to those meeting the qualifications. Certification Making a Difference