RTT Requirements 2026: Eligibility, Prerequisites & How to Qualify

What "Qualifying" Means for This Credential

On this site, "RTT" refers to Registered Technologist - Radiation Therapy, the credential issued by the American Registry of Radiologic Technologists (ARRT) in the Radiation Therapy (T) discipline. The abbreviation "RTT" is simply the label we use here; ARRT's own discipline designation is Radiation Therapy (T). If you want the naming background first, see What Is RTT Certification? or What Does RTT Stand For?.

Qualifying is a three-part process, and each part has its own gatekeeper:

1. Education: an associate degree or higher plus completion of an ARRT-verified radiation therapy educational program.
2. Clinical competency: documented, directly observed completion of specific procedures and activities.
3. Ethics: compliance with ARRT's ethics requirements, reviewed as part of your application.

Only when all three are satisfied can you sit for the computer-based examination. This article is based on the 2026 Primary Eligibility Pathway Handbook and ARRT's Radiation Therapy Didactic and Clinical Competency Requirements. Because requirements are revised periodically, always confirm details on the ARRT credential page before you apply.

The Education Requirement: Degree, Program, Timing

The degree

You need an associate degree or higher from an institution that is accredited in a way ARRT recognizes. The degree can be in any major. A student whose associate degree is in general studies can qualify just as readily as one whose degree is in radiation therapy, as long as the radiation therapy program itself is ARRT-verified. The degree must be conferred before you take the examination, so a pending degree is a scheduling problem, not just a paperwork problem.

The program

Separately from the degree, you must complete an ARRT-verified radiation therapy educational program, including its didactic coursework and clinical competencies. Many candidates satisfy the degree and the program simultaneously because their program awards the degree, but the two requirements are distinct. If your degree and your therapy training come from different institutions, confirm that the program component is the verified one.

The three-year clock

There is a timing rule that catches people off guard: the degree must be earned and the application submitted no more than three years after you complete your program. This initial application deadline is a different clock from the three-year period for examination attempts discussed below. Missing the first one can mean needing to revisit your eligibility, so do not let a finished program sit idle while life gets busy.

Clinical Competency Requirements in Detail

This is where the credential differs most from a purely academic path. Radiation therapy is a hands-on, patient-facing profession, so ARRT requires you to demonstrate competence in a defined list of activities, not merely pass coursework. According to the competency requirements document, the clinical component includes:

Direct observation is non-negotiable

The program director or designee must verify your clinical competency through in-person direct observation. Remote or virtual observation is not accepted. For students, this means that clinical sign-offs depend on supervisors who are physically present and watching you perform. Plan your clinical rotations so you are not scrambling in the final weeks to find observers for rarer procedures such as the specialized simulation or specialized accessory-device construction items.

Ethics Requirements

ARRT evaluates every applicant against its ethics requirements, which cover matters such as certain criminal convictions, military court-martials, and honor code violations. If anything in your history could raise a question, ARRT offers a pre-application review so you can learn how your situation would be viewed before investing in the full process. Ethics compliance is not a one-time hurdle: it continues for as long as you hold the credential, and it is a condition of annual renewal. The practical advice is simple: disclose accurately and early.

Do You Need a Radiography Credential First?

No, not as a universal prerequisite. The Radiation Therapy (T) credential described here is earned through the primary pathway; it is not a Radiography postprimary examination. A candidate can come into radiation therapy directly from an ARRT-verified therapy program without first holding a Radiography credential. Some individuals do hold other ARRT credentials, and a given program may have its own admission preferences, but ARRT's primary eligibility requirements for this discipline do not require Radiography as a stepping stone. If you are comparing career entry routes, our RTT training overview covers how people typically prepare.

Applying: Fees, Deadlines, and Attempt Limits

Fees are set by ARRT and can change, so verify them on ARRT's current fee page before budgeting. For a full picture of costs beyond the application itself, see our RTT certification cost breakdown. For scheduling mechanics and testing windows, see RTT exam dates and deadlines.

Why the attempt limit matters to your timeline

You get three attempts within three years of the opening of your initial examination window. Each reattempt requires the $200 reapplication fee. Because the window clock keeps running whether or not you test, a candidate who delays their first sitting is quietly shrinking the time available for retakes. Sitting reasonably soon after eligibility, with solid preparation, protects both your budget and your attempt count.

What You Are Qualifying to Sit For

Understanding the exam you are qualifying for helps you decide when to start preparing, because the format shapes the preparation. Here is how the examination works:

• Length: 230 total questions, of which 200 are scored and 30 are unscored pilot questions. You will not know which are which.
• Time: 230 minutes of examination answering time, within a 250-minute appointment that includes the tutorial, nondisclosure agreement, and survey.
• Format: computer-based and primarily single-best-answer multiple choice, with possible alternative item formats and image-based questions. The ARRT handbook also describes multiple-response and ordered-response formats.
• Rules: closed book. Basic and scientific on-screen calculators are available, and Pearson can supply a basic four-function calculator on request. Personal calculators are prohibited.
• Navigation: you must answer each item before advancing, but you may flag and revisit answers.

The calculator policy deserves attention for this particular discipline, because dose calculation is a major examination theme. Practice with the on-screen scientific calculator rather than a handheld device you will not be allowed to use. For difficulty context, read How Hard Is the RTT Exam?.

For outcomes, ARRT's Annual Exam Report for 2025 lists a first-time candidate pass rate of 77.1% (n=958). Our RTT pass rate analysis explains how to read that figure responsibly.

The Three Content Categories and Their Weight

Eligibility gets you to the exam; the content specifications tell you what is on it. For examinations through January 31, 2027, the controlling document is the Radiation Therapy Examination Content Specifications effective January 1, 2022. ARRT publishes a separate 2027 specification that takes effect February 1, 2027; that is a different scope, and 2026 candidates should work from the current one. Scored-question allocations (out of 200) are:

Procedures accounts for 103 of 200 scored questions, so more than half of your score depends on one category. Within it, Treatments (35) is the single largest subcategory in the entire exam. A few scope notes from the specifications help you avoid over-studying: SI units are primary; brachytherapy coverage is limited to basic common-use, surrounding-tissue-dose, and radiation-protection concepts rather than detailed procedures or isotope characteristics; staging is limited to basic concepts rather than site-specific staging; and specific CPT codes are excluded.

For a deeper walk through each category, see RTT Exam Domains: Complete Guide to All 3 Content Areas.

Sequencing Your Prep Around Your Program

The qualification path and the study path overlap, which is an advantage. Your clinical rotations are essentially live practice for Procedures, and your didactic courses cover Safety and Patient Care. Rather than a generic schedule, align your review with where you are in the program:

The reasoning is straightforward: Safety concepts underlie dose and treatment decisions, so mastering them first makes Procedures easier. Procedures, being the heaviest category, deserves the longest runway. For a fuller plan, see the RTT study guide, and keep the RTT cheat sheet handy for last-week review.

After You Qualify: Keeping the Credential Active

Earning the credential is not the end of the requirements. To maintain certification and registration, you must:

• Renew annually, at $65 regardless of how many ARRT credentials you hold
• Remain in continuing compliance with ethics requirements
• Earn 24 approved continuing education (CE) credits per two-year biennium, which is per biennium and not per credential

Credentials earned on or after January 1, 2011 also carry Continuing Qualifications Requirements (CQR) every 10 years. This involves a professional profile, a structured self-assessment, and any prescribed CE. ARRT also permits accepting the maximum CQR CE prescription instead of taking the self-assessment. Knowing this upfront helps you evaluate long-term commitment; our ROI analysis and salary guide help weigh that commitment against career outcomes, and RTT jobs shows where credential holders typically work, such as cancer centers and hospital radiation oncology departments.

Frequently Asked Questions

Qualifying is mostly a matter of sequencing: degree, verified program, observed competencies, clean ethics record, then application within the window. When you are ready to measure your readiness against the three content categories, try a timed set on the main practice test site, and revisit the full overview in our RTT requirements reference as your program progresses.