DANB RHS Exam 2026: Complete Guide to the Radiation Health and Safety Exam
DANB RHS Exam 2026: Complete Guide to the Radiation Health and Safety Exam
The Radiation Health and Safety examination, commonly called the RHS exam, is one of DANB's most important examinations for dental assistants.
It tests knowledge related to dental radiography and radiation safety and is a component of both the CDA and NELDA certifications.
What Is the RHS Exam?
The RHS examination currently consists of 75 questions and has a 60-minute testing time. DANB provides both testing-center and online-proctored options, and the examination is also offered in Spanish.
What Does the RHS Exam Cover?
Candidates should review:
Radiation physics
Radiation biology
Radiation protection
Dental radiographic equipment
Digital radiography
Image receptors
Patient positioning
Exposure factors
Image quality
Radiographic errors
Radiation Physics
Students should understand fundamental concepts involving radiation and how radiographic exposure affects images.
Technical concepts can initially seem difficult, so candidates should spend additional time on areas they find confusing.
Radiation Safety
Radiation protection is another major part of preparation.
Candidates should understand how dental professionals protect patients and themselves from unnecessary radiation exposure.
Radiographic Errors
Candidates should also study common radiographic errors and understand how positioning, angulation and exposure affect the final image.
This is an area where practice questions can be especially useful.
How to Study for RHS
Start with DANB's official RHS examination outline and references.
Then divide your studying into categories.
Study radiation fundamentals first, followed by equipment and safety, then radiographic technique and image quality.
Finish with practice questions.
DANB currently provides official RHS study materials through its examination resources, and the DALE Foundation offers RHS review and practice materials.
RHS Preparation in NYC
Students in New York City can supplement their dental assisting education with RHS-specific tutoring.
Individual tutoring can be useful for candidates who understand clinical assisting but find radiation physics or radiography terminology difficult.
Final Week
During the final week, focus on practice questions and recurring mistakes.
Review technical concepts rather than attempting to memorize hundreds of unrelated facts.
Final Thoughts
The RHS examination is focused, but candidates should not underestimate the amount of material involved.
A structured study plan, official examination resources and regular practice can make preparation considerably more manageable.
Official resources:
DANB RHS Examination
DANB Exams
