RSO, CHP, Medical Physicist: what each role actually does

Procurement teams routinely conflate the Radiation Safety Officer (RSO), Certified Health Physicist (CHP), and Medical Physicist roles. Hiring the wrong one wastes budget and creates compliance gaps. Here's what each actually does.

Radiation Safety Officer (RSO).A regulatory role, not a credential. The RSO is named on your NRC or Agreement State license and is responsible for day-to-day implementation of the radiation safety program. The RSO can be a CHP, a medical physicist, a nuclear engineer, or in some cases a non-credentialed individual who has completed approved training and is approved by the regulator. Small licensees often retain an RSO part-time from a consulting firm.

Certified Health Physicist (CHP).A credential awarded by the American Board of Health Physics after candidates pass a rigorous two-part examination. CHPs work across medical, industrial, nuclear, and research settings, and are the typical credential for senior consulting work in radiation safety. CHP is not specific to any one industry.

Medical Physicist (ABR-certified).A specialty role focused on the safe and effective use of radiation in medicine. ABR certification has separate tracks for Diagnostic Medical Physics, Therapeutic Medical Physics, and Nuclear Medical Physics. Medical physicists conduct equipment surveys, treatment plan reviews, and QA — work that requires deep clinical and physics knowledge that a CHP would not typically have.

When you need each.A hospital imaging center needs a Diagnostic Medical Physicist for annual surveys and a CHP-credentialed RSO for the license. A research university needs a CHP-credentialed RSO and rarely needs a medical physicist. An industrial radiographer needs a CHP-credentialed RSO familiar with 10 CFR Part 34.

When in doubt, write the actual deliverable into the SOW — "annual mammography accreditation survey" or "license amendment for added isotope" — and let the vendor confirm they have the right credential to sign.