A radiation-oncology service cannot legally treat its first patient until a formal radiation safety program is in place, the shielding has been independently verified by physics survey, and the appropriate state and/or federal authorizations are held. This article covers the regulatory licensing pathway, the radiation safety program and its governance, the shielding-integrity and radiation surveys that close out construction, and the surveillance program that runs for the life of the facility. It is the compliance and authorization layer that wraps around the physical vault, the equipment, and the clinical workflow — distinct from the physics beam acceptance/commissioning and the day-to-day operational readiness that are covered by sibling Articles.

The two parallel regulatory regimes determine who licenses what

A radiation-oncology program almost always operates under two distinct regulatory frameworks at once, and a project team must know early which authority governs each technology. Confusing the two is a common and costly mistake, because the licensing body dictates the application content, the timeline, and the survey/inspection regime that gates activation.

• Machine-produced radiation (linear accelerators, CT-simulators, superficial/orthovoltage units, kV imaging). External-beam machines that produce radiation only when energized are not regulated by the U.S. Nuclear Regulatory Commission (NRC). They fall under state radiation-control programs — typically the state department of health's radiation control bureau, operating under regulations modeled on the Conference of Radiation Control Program Directors (CRCPD) Suggested State Regulations (SSRs). Registration of an X-ray-producing machine, plan review of the shielding design, and a post-installation radiation survey are the usual state requirements.
• Radioactive material — sealed and unsealed sources (brachytherapy seeds/sources, HDR afterloader sources such as Ir-192 or Co-60, sealed calibration sources, any unsealed therapy isotopes). These are regulated under the Atomic Energy Act via either the NRC directly or an Agreement State. About three-quarters of states are NRC Agreement States, meaning the NRC has relinquished day-to-day regulatory authority to a state program whose rules are at least as stringent as the federal 10 CFR Part 20 (radiation protection) and 10 CFR Part 35 (medical use of byproduct material). In a non-Agreement State, the NRC licenses byproduct material directly.

The practical consequence: a single cancer center building both a LINAC vault and an HDR brachytherapy suite will hold a state machine registration for the accelerator and a separate radioactive-material license for the HDR/brachytherapy sources, often from two different offices within the same state agency. Each has its own application, fee, review timeline, and inspection.

The radioactive-material license is the long-lead regulatory item

Of all the authorizations a radiation-oncology project needs, the radioactive-material (RAM) license — sometimes called a medical-use or byproduct-material license — is typically the long-pole item and should be initiated months before clinical go-live. A specific license for medical use must demonstrate that the facility has the people, procedures, equipment, and facilities to use the requested material safely.

A medical-use license application typically must address:

• Authorized Users (AUs) — named, credentialed physicians (radiation oncologists) who meet the training and experience requirements in 10 CFR Part 35 (or the Agreement-State equivalent) for the specific category of use requested (e.g., manual brachytherapy, remote-afterloader HDR, gamma stereotactic — each is a separate authorization).
• Authorized Medical Physicist (AMP) — a qualified medical physicist with the requisite board certification or training/experience pathway, responsible for calibration, full calibration of remote afterloaders, and survey-instrument oversight.
• Radiation Safety Officer (RSO) — the individual with day-to-day authority and responsibility for the radiation protection program (see below).
• Requested material and use category — isotope, maximum activity/possession limit, and the Part 35 subpart under which it will be used (e.g., §35.400 manual brachytherapy sources, §35.600 remote afterloaders).
• Facility description and shielding — drawings of the source-handling and storage areas, the shielding design, and the security/storage arrangements for sealed sources.
• Radiation safety program — the written procedures, the model/serial of survey instruments and their calibration, leak-test procedures for sealed sources, and emergency procedures.

Amendments are required whenever the program adds an AU, a new isotope or use category, a new room, or a new device. A facility should plan license amendments as part of any future expansion (for example, adding a second HDR unit or moving to a different afterloader model).

A formal Radiation Safety Program and committee govern the operation

Regulators require a written, leadership-endorsed radiation safety program and a person accountable for it. The program is not a one-time deliverable — it is the standing governance structure that the licensing inspectors will audit.

• Radiation Safety Officer (RSO). A named individual (often a medical physicist or, in larger institutions, a dedicated health physicist) with delegated authority from management to enforce the program, stop unsafe practices, and interface with regulators. The RSO's authority must be documented in a management commitment.
• Radiation Safety Committee (RSC). Larger institutions and those with broad-scope licenses convene an RSC that includes the RSO, Authorized Users, management, and nursing representation. It reviews dose records, approves new uses and users, reviews incidents, and oversees the ALARA program. A small clinic with a narrow license may operate under the RSO alone without a standing committee, depending on license conditions.