About Dosimetry

The medical dosimetrist is a member of the radiation oncology team working in collaboration with the medical physicist and radiation oncologist. Through knowledge of radiation oncology treatment machines and equipment and application of principles of physics, anatomy and radiobiology, the dosimetrist generates life-saving radiation therapy treatment plans.

As of the January 2025 exam administration, there are 4,913 CMDs worldwide: 94% are in the United States, 3% in Canada and 3% outside the United States and Canada. Those outside the United States and Canada are chiefly in Hong Kong, Singapore and South Korea.

United States

Canada

Around the World