RT Study Guide 2026

Everything you need to pass the RT exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.

RT exam key facts

The ARRT Radiation Therapy exam has 230 questions: 200 scored items and 30 unscored pilot items. Source
The ARRT Radiation Therapy exam allows 230 minutes of test time inside a 250-minute (4 hours, 10 minutes) appointment that also covers the tutorial, NDA and survey. Source
You need a total scaled score of 75 on a 1–99 scale to pass the ARRT Radiation Therapy exam. Source
The ARRT Radiation Therapy (T) primary certification and registration application costs $225. Source
ARRT allows three attempts within three years to pass the Radiation Therapy exam, counted from the start of the first exam window. Source
ARRT Radiation Therapy certification and registration has to be renewed every year to stay active. Source

Start the Timed RT Mock Exam →

📋 RT Exam Format at a Glance

170

Questions

220 min

Time Limit

75%

Passing Score

Take a Full RT Exam Simulation →

📚 RT Topics to Study (28)

Patient Care and Management · 9 cards Radiation Physics and Dosimetry · 9 cards Radiation Safety and Protection · 9 cards Radiation Therapy Procedures · 9 cards Documentation Standards · 7 cards Documentation Standards · 7 cards Documentation Standards · 7 cards Documentation Standards · 7 cards Patient Care and Management · 7 cards Patient Care and Management · 7 cards Radiation Biology · 7 cards Radiation Biology · 7 cards Radiation Safety and Protection · 7 cards Radiation Safety and Protection · 7 cards Radiation Safety and Protection · 7 cards Radiation Safety and Protection · 7 cards Treatment Planning · 7 cards Treatment Planning · 7 cards Treatment Planning · 7 cards Treatment Planning · 7 cards Clinical Assessment Methods · 6 cards Diagnostic Procedures · 6 cards Documentation Standards · 6 cards Medical Ethics and Law · 6 cards Patient Communication · 6 cards Patient Safety Protocols · 6 cards Pharmacology Basics · 6 cards Treatment Planning · 6 cards

✍️ Sample RT Questions & Answers

1. An area where a person could receive more than 1 mSv (100 mrem) in one hour at 30 cm from the source must be posted as what?

✓ High Radiation Area

NRC defines a High Radiation Area as one exceeding 1 mSv (0.1 rem) per hour at 30 cm.

2. ICRU Report 83 recommends reporting which dose as the 'near-maximum' dose?

✓ D2%

D2%, the dose received by 2% of the volume, replaces the point maximum as the near-maximum dose.

3. Which detail is most important to include in setup documentation for reproducing a patient's position each day?

✓ Immobilization devices, their indexing positions, and reference mark locations

Documented immobilization and reference marks let any therapist reproduce the simulated position accurately.

4. Why is it important to monitor radiation exposure to the patient during therapy?

✓ To ensure the patient’s safety and to avoid excessive radiation exposure.

Monitoring radiation exposure to the patient during therapy is paramount to ensure their safety and prevent excessive radiation exposure. This continuous oversight helps the medical team adhere to the prescribed dose limits, protecting healthy tissues from unnecessary damage and reducing the risk of severe side effects. It is a critical component of quality assurance, ensuring the patient receives the optimal therapeutic benefit with minimal harm.

5. A therapist sees moist desquamation in the treatment field. How should this be documented?

✓ Describe it with a standardized grading scale such as CTCAE or RTOG and notify the physician

Standardized toxicity grading makes the documentation objective and comparable, and the physician must be told.

6. What is the equivalent square of a 10 cm x 20 cm rectangular field using the area/perimeter (4A/P) method?

✓ 13.3 cm

4A/P = 4(200)/60 = 13.3 cm.

🎯 Free RT Practice Tests

Radiation Therapy Procedures · 9 questions Patient Care and Management · 9 questions Radiation Safety and Protection · 9 questions Radiation Physics and Dosimetry · 9 questions Radiation Biology · 7 questions Documentation Standards · 7 questions Documentation Standards · 7 questions Documentation Standards · 7 questions Documentation Standards · 7 questions Treatment Planning · 7 questions

📖 RT Guides & Articles

Your RT Study Path

1. Learn with Flashcards → 2. Drill Practice Tests → 3. Take the Full Exam Simulation

🃏 RT Flashcards (196)🏆 RT Exam Simulation

What Practice Test Geeks adds beyond an AI chat for RT

An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:

A timed, full-length RT mock exam — 170 questions in 220 minutes with a 75% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
A fixed RT question bank: the same test every attempt, so your score is comparable from one try to the next instead of changing with every regenerated quiz.
Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
A printable RT cheat sheet you can print or save as a PDF.
RT flashcards built from the same question bank.
Free RT practice tests with the correct answer shown after each question.

Start the Timed RT Mock Exam →

Was this helpful?

How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

arrt.org — Score validity, retake policy, test delivery, passing score, score release, fees, exam information · verified Oct 2026
assets-us-01.kc-usercontent.com — Eligibility, exam format, time limit, exam information · verified Oct 2026