At the top of this page, you’ll find a button that provides full access to the Radiation Health and Safety (RHS) practice exam. Just below this, there’s an opportunity to engage in a comprehensive practice test aimed at providing a thorough review. These tests play a crucial role in demonstrating your strengths, pinpointing areas for improvement, and refining your study strategy.

To enhance your preparation further, particularly in topics requiring additional attention, we’ve developed targeted quizzes. These quizzes have been carefully crafted to focus on particular segments of the Radiography exam, ensuring a concentrated and efficient study experience.

CDA DANB Radiation Health and Safety (RHS) Domain Exams

The Certified Dental Assistant (CDA) Examination administered by the Dental Assisting National Board (DANB) includes a component known as the Radiation Health and Safety (RHS) exam. This component is crucial for dental assistants who wish to demonstrate their knowledge and competence in dental radiography. The RHS exam is designed to assess an individual’s understanding of radiographic techniques, radiation safety, infection prevention, and control in the dental office. 

Here’s a breakdown of the key domains covered in the RHS exam:

Domain 1: Purpose and Technique

  • Percentage of Exam: 50%
  • Focus: This section focuses on understanding the principles of radiography, including the types of radiographic images, indications for their use, factors influencing image quality, and the procedural steps for taking radiographs. Knowledge of the anatomical landmarks visible in radiographs and the criteria for acceptable images is also assessed.

Welcome to your CDA RHS Domain 1: Purpose and Technique

Domain 2: Radiation Safety

  • Percentage of Exam: 25%
  • Focus: This domain assesses knowledge related to radiation biology, the effects of radiation exposure, and the principles of radiation protection for both the patient and the operator. Topics include understanding the ALARA principle (As Low As Reasonably Achievable), the use of protective equipment, and guidelines for minimizing radiation exposure.

Welcome to your CDA RHS Domain 2: Radiation Safety

Domain 3: Infection Prevention and Control

  • Percentage of Exam: 25%
  • Focus: This section covers the protocols and practices for preventing the transmission of infectious diseases in the dental office. It includes understanding the use of personal protective equipment (PPE), sterilization and disinfection of radiographic equipment, and compliance with standards set by organizations such as the CDC (Centers for Disease Control and Prevention) and OSHA (Occupational Safety and Health Administration).

Welcome to your CDA RHS Domain 3: Infection Prevention and Control

Exam Domain% of ExamKey Topics
Purpose and Technique50%Principles of radiography, types of radiographic images, image quality factors, procedural steps, anatomical landmarks, criteria for acceptable images
Radiation Safety25%Radiation biology, effects of radiation exposure, radiation protection, ALARA principle, protective equipment, minimizing exposure guidelines
Infection Prevention and Control25%Infection transmission prevention, personal protective equipment (PPE), sterilization and disinfection, CDC and OSHA standards compliance

Additional Important Details:

  • Total Number of Questions: 100 multiple-choice questions.
  • Duration: The exam duration is approximately 1 hour and 15 minutes.
  • Passing Score: Determined through a scaled scoring system; candidates must meet or exceed the set standard to pass.
  • Eligibility Requirements: Candidates must meet specific eligibility criteria, which may include completion of a dental assisting program or a certain amount of work experience. It’s important to check the latest requirements on the DANB website.
  • Study Materials and Resources: The DANB offers various resources, including reference materials and practice tests, to help candidates prepare for the exam. These materials can be found directly on the DANB website and include textbooks, online courses, and guideline documents for infection control and radiography best practices.

CDA DANB Radiation Health and Safety (RHS) Exam Breakdown

The CDA DANB Radiation Health and Safety (RHS) Exam is a certification examination administered by the Dental Assisting National Board (DANB). It is designed for dental assistants and professionals who wish to demonstrate their knowledge and competence in radiation health and safety practices, particularly those involving dental X-ray equipment operation and safety measures to protect both patients and staff from unnecessary radiation exposure. This certification is important for those working in dental practices to ensure compliance with state and federal regulations regarding dental radiography.

Breakdown of the RHS Exam:

  • Content and Scope:
    • The exam covers a wide range of topics related to radiation health and safety, including radiation physics, radiobiology, radiation protection, X-ray film and image processing, infection control, and quality assurance in the dental office.
    • Questions may also cover the proper use and maintenance of radiographic equipment, as well as state and federal regulations that apply to dental radiography.
  • Format and Duration:
    • The exam format is typically multiple-choice, testing both theoretical knowledge and practical application.
    • Candidates have a set amount of time to complete the exam, usually a few hours, though the exact duration can depend on the specific testing format.
  • Eligibility: Eligibility criteria for the RHS exam can vary depending on state regulations. Generally, candidates must have completed a certain level of education in dental assisting or a related field, and may also need to have completed specific coursework in dental radiography.
  • Preparation and Study Materials:
    • DANB offers various study materials and practice exams to help candidates prepare for the RHS exam. These can include textbooks, online courses, and practice tests.
    • It’s important to review the most current guidelines and recommendations from reputable dental organizations and to stay up-to-date with any changes in regulations or best practices in dental radiography.
  • Registration and Scheduling:
    • Candidates need to register for the exam through the DANB website or by contacting DANB directly. There is a fee to take the exam.
    • Exams are scheduled at various times throughout the year and at multiple locations, offering flexibility to candidates.
  • Certification and Recertification: Upon passing the RHS exam, candidates receive a certification that is recognized in many states. This certification may need to be renewed periodically, requiring continuing education and possibly re-examination.
  • State Regulations: It’s crucial to understand that specific requirements for dental radiography and certification can vary significantly by state. Candidates should check with their state’s dental board or regulatory agency for specific requirements related to dental assisting and radiography certification.

How to Become Radiation Health and Safety (RHS) Certified

To become CDA DANB Radiation Health and Safety (RHS) Certified, you need to follow specific steps as outlined by the Dental Assisting National Board (DANB). Here’s a brief guide on how to achieve this certification, along with essential resource links:

  • Understand the Requirements: Start by familiarizing yourself with the certification requirements. This involves understanding the exam’s scope, eligibility criteria, and any prerequisites. The DANB website provides comprehensive information about these aspects.
  • Prepare for the Exam: Preparation is key to passing the RHS exam. Utilize study materials, practice tests, and courses offered by the DALE Foundation to strengthen your knowledge and test-readiness. Engaging with these resources can significantly boost your confidence and performance on the exam day.
  • Apply for the Exam: Once you feel prepared, the next step is to apply for the RHS exam. The application process involves submitting the necessary documents and fees. Details on how to apply, along with forms and policies, can be found on the DANB website.
  • Schedule and Take the Exam: After your application is approved, schedule your exam at a convenient time and location. The exam can be taken online or at a designated test center. Ensure you understand the exam format and follow any guidelines provided by DANB.
  • Maintain and Renew Certification: Upon passing the exam, you will earn your RHS certification. To maintain this certification, you’ll need to meet ongoing education requirements and renew your certification periodically. Information on maintenance and renewal can also be accessed on the DANB website.

Our Experience Teaching CDA DANB Radiation Health and Safety (RHS) Candidates To Pass The Exam

Creating the Radiation Health and Safety (RHS) practice tests at Career Employer has been a remarkable journey, filled with notable accomplishments and hurdles. Inspired by the wide-ranging subjects covered in the exam, our aim has been to meet the diverse needs of our learners.

Our approach is thoughtfully designed to prepare each student for success in the exam. Our dedication to delivering a complete educational experience is evident in the thoroughness and precision of our practice materials. This underscores our commitment to the success of our students, showing our determination to assist them at every stage of their journey.

Teaching the CDA (Certified Dental Assistant) DANB (Dental Assisting National Board) Radiation Health and Safety (RHS) certification course from a lecturer’s perspective involves several key elements to ensure that students are well-prepared for both the examination and practical application in dental assisting roles. The RHS certification focuses on ensuring that dental assistants are knowledgeable about the safe handling of radiographic equipment, understanding radiation safety principles, and applying these practices to protect both patients and staff.

Curriculum Development

The development of a curriculum for the RHS certification involves a thorough understanding of the exam content outlined by the DANB. It includes topics such as radiographic techniques, radiation safety, image acquisition and evaluation, and compliance with state and federal regulations. As a lecturer, it’s essential to stay updated with the latest guidelines and advancements in dental radiography.

Teaching Resources 

  • Official DANB Exam Outline: The DANB provides an exam outline and a reference list that details the topics covered in the RHS exam. This is the first resource to consult when designing the course syllabus. DANB RHS Exam Outline
  • Textbooks and Manuals: Key textbooks such as “Essentials of Dental Radiography for Dental Assistants and Hygienists” by Thomson and Grainger offer comprehensive coverage of dental radiography principles. Including current textbooks and manuals in the curriculum is crucial for providing students with a strong theoretical foundation.
  • Online Courses and Webinars: Online resources such as webinars, online courses, and video tutorials can complement traditional lecture methods. These resources provide visual and practical examples that can enhance learning. Websites like Coursera, Khan Academy, and specific dental education platforms offer courses related to dental radiography.
  • Radiation Safety Manuals: The U.S. Nuclear Regulatory Commission (NRC) and the Environmental Protection Agency (EPA) publish guidelines and manuals on radiation safety practices. Incorporating these resources into the curriculum ensures that students learn about safety measures that comply with legal standards. NRC Guidelines

Teaching Strategies

  • Interactive Learning: Engaging students through hands-on practice sessions, interactive simulations, and lab exercises is vital for teaching practical skills in radiography.
  • Case Studies and Scenarios: Presenting real-world scenarios and case studies helps students understand the application of radiation health and safety principles in various dental settings.
  • Assessment and Feedback: Regular quizzes, mock exams, and practical assessments provide students with feedback on their understanding and readiness for the certification exam.
  • Continuing Education: Encouraging students to engage in continuing education and professional development opportunities helps them stay informed about the latest trends and technologies in dental radiography.

The creation of our Radiation Health and Safety (RHS) certification practice tests at Career Employer is the culmination of efforts from a dedicated group of experts. Each member of our team possesses a significant amount of experience and specialized knowledge, which has been crucial in preparing candidates for the dental Radiography exam. Together, their expertise has contributed to the success of over 1000 radiologists in obtaining their Radiation Health and Safety (RHS) certifications, with a particular focus on meeting the needs of radiography technicians.

Our team is composed of seasoned professionals, each with a minimum of ten years of dedicated experience in the field of radiography. This depth of expertise ensures that our practice materials are developed by leading authorities in the field and are highly effective in equipping candidates for successful certification. Our commitment to excellence guarantees that individuals utilizing our resources are fully prepared and confidently ready to achieve their certification goals.

Effective Study Strategies and Methods

Preparing for the CDA DANB Radiation Health and Safety (RHS) exam involves a systematic approach to study strategies and leveraging the best resources available online. Here’s a comprehensive guide based on insights from reliable web pages and online forums:

  • Understand the Exam Structure and Content: The RHS exam comprises 100 multiple-choice questions covering radiology practices, patient care, and radiation safety procedures, to be completed in 75 minutes. Focus areas include image acquisition and evaluation, radiation safety, and infection control​​.
  • Application and Registration Process: Before diving into your studies, ensure you’re aware of the application submission, fee payment, and exam scheduling processes. This foundational step is crucial to avoid any surprises along your certification journey​.
  • Study Materials and Resources: Utilize official textbooks endorsed by DANB and the DALE Foundation’s suite of interactive tools and practice tests. These resources are designed to simulate the exam experience and cover key concepts in depth​.
  • Developing an Effective Study Plan: Crafting a study schedule that accommodates your daily routine is crucial. Allocate study sessions throughout the week, set realistic goals, and maintain consistency in your study times. Incorporate a variety of study methods, including study groups, flashcards, and review courses, to cater to different learning styles​​.
  • Practice Tests and Question Analysis: Regular practice tests are essential for familiarization with the exam format, identifying weak areas, and improving time management skills. After each practice test, analyze your performance to understand why answers were correct or incorrect. This practice is invaluable for honing your test-taking skills​​.
  • Exam Day Preparation: Whether you are taking the test in person or remotely, arrive early and ensure you have a valid photo ID. Understand the rules regarding personal items and the use of electronic devices. For remote testing, complete the check-in process, which includes ID verification and a room scan, ahead of time​​.
  • Scored Adaptive Nature of the Exam: Be aware that the exam is computer-adaptive, meaning the difficulty adjusts based on your performance. Your final question’s difficulty level must meet or exceed the pass mark for a successful outcome​.
  • Leveraging Online Forums and Communities: Engage with online study groups and forums for additional tips, shared experiences, and moral support. These communities can offer new insights and encouragement throughout your preparation journey.
  • Contacting DANB for Support: If you have any questions or need assistance, reach out to DANB directly. They offer resources to apply and prepare for the exam, including the RHS Application Packet and Exam Outline​.

By following these strategies and utilizing the recommended resources, you can approach your RHS exam preparation with confidence and a clear plan. Remember, success in the exam not only depends on the knowledge you acquire but also on how effectively you manage your study time and resources.


RHS Exam Prep BundleIncludes DANB RHS Review course and DANB RHS Practice Test$140
DANB RHS Review CourseIn-depth review covering essential topics related to dental radiography$130
DANB RHS Practice TestOver 200 practice questions for exam preparation$39
CDA Exam Prep BundleComprehensive package for CDA exam preparation, including practice tests and review courses$450

The cost for the DANB Radiation Health and Safety (RHS) exam, along with associated study materials and any post-exam fees, can be broken down into several components:

  • Exam Fee: The cost for the RHS exam itself wasn’t explicitly mentioned in the provided pages. It’s essential to visit the DANB’s official website or contact them directly for the most accurate and current exam fee information.
  • Study Materials:
    • The RHS Exam Prep Bundle, which includes a review course and a practice test, is priced at USD 140. This bundle offers a comprehensive preparation for the RHS exam with six months of access​​.
    • The DANB RHS Review Course alone is priced at USD 130 and is designed to help candidates understand key concepts and procedures related to dental radiography. It’s updated regularly to ensure relevance and accuracy​​.
    • A standalone DANB RHS Practice Test is available for USD 39. This practice test aims to familiarize candidates with the exam format and types of questions they will encounter​​.
  • Additional Costs:
    • If you’re considering more extensive certification, such as the Certified Dental Assistant (CDA) designation, which includes the RHS exam as one component, you might also be interested in the CDA Exam Prep Bundle priced at $450​​.
    • Other preparation materials and courses, including those for the National Entry Level Dental Assistant (NELDA) certification, offer various prices depending on the bundle or individual course chosen.

Remember, these costs are specific to the preparation and taking of the RHS exam and do not include potential additional fees for application processing, retakes, or certification maintenance. It’s also crucial to check for any updates or changes in fees directly with the DANB and The DALE Foundation, as prices and available resources may vary over time.

Reliable Study Materials and Resources

To prepare for the CDA DANB Radiation Health and Safety (RHS) certification exam, there are several comprehensive resources and strategies you can employ:

  1. DANB’s Official Website: The Dental Assisting National Board (DANB) provides extensive information on the RHS exam, including an application packet, candidate handbook, exam outline and references, and details on both in-person and online proctored exam formats. The site offers guidance on what to expect on exam day, the testing window, question format, and materials for study. It’s a great starting point to understand the structure of the exam and the topics covered​​.
  2. The DALE Foundation: The DALE Foundation, the official DANB affiliate, offers an RHS Exam Prep Bundle for $140. This bundle includes a comprehensive review course and a practice test, with access to the materials for six months. The course and test aim to prepare you for the exam by covering essential topics related to dental radiography and helping you identify areas that may need further study. The bundle is designed to complement your study plan and provide a detailed review as well as test-taking strategies specific to the RHS exam.
  3. Mometrix Test Preparation: Mometrix offers free practice tests and study guides for the RHS exam. Their website emphasizes the importance of understanding how the exam is scored and provides strategies for studying effectively. Mometrix’s resources include flashcards and detailed explanations for answers, helping you to comprehend each topic thoroughly and identify your weak areas​.
  4. YouTube Study Guides: For visual and auditory learners, YouTube channels such as the one mentioned in the resources provide video study guides and explanations of concepts related to the RHS exam. These videos can be a great supplement to your study materials, offering a different approach to learning the material​.
  5. DANB RHS Review and Practice Test on the DALE Foundation: The DALE Foundation also offers individual review courses and practice tests outside of the bundle. The RHS Review course (USD 130) covers key areas such as anatomy, radiation biology concepts, radiographic exposure, and processing equipment. The practice test (USD 39) offers over 200 questions to test your knowledge and prepare you for the exam format​.

Using these resources effectively involves a strategic approach to studying: begin with a comprehensive review of the materials, identify and focus on areas where you need improvement, and utilize practice tests to gauge your readiness. Mixing different types of resources, such as reading materials, interactive courses, and videos, can help accommodate different learning styles and ensure a well-rounded preparation.

Remember, consistent study, understanding the exam format, and familiarizing yourself with the type of questions asked are key to passing the RHS exam.

Tips for Exam Day

To excel on the CDA DANB Radiation Health and Safety (RHS) exam and enhance your chances of passing, here are consolidated tips and resources drawn from the Dental Assisting National Board (DANB) and the DALE Foundation, among other reputable sources:

Before Exam Day

  • Understand the Exam Structure: The RHS exam is comprised of 100 multiple-choice questions to be completed within 1 hour and 15 minutes. It covers image acquisition and evaluation, radiation safety, radiation physics and characteristics, and infection control​​.
  • Review Study Materials: Utilize the RHS Exam Prep Bundle offered by the DALE Foundation, which includes a review course and practice tests. This bundle is designed to cover essential topics and offers a comprehensive way to prepare​​.
  • Create a Study Plan: Break down the exam content into manageable sections and allocate specific times for study. Setting small, achievable milestones leading up to the exam can keep you motivated and on track​.

Exam Day Tips

  • Arrive Early: Aim to get to the testing center at least 30 minutes before your scheduled exam time. This will allow you to complete the check-in process without rushing.
  • Identification and Confirmation: Bring a government-issued ID and your exam confirmation notice or number. These will be necessary for the check-in process​​.
  • Follow Test Center Regulations: Be prepared to leave personal belongings in a designated area outside the exam room. Most centers have strict policies regarding personal items​​.

During the Exam

  • Carefully Read Each Question: Take your time to understand what each question is asking. Look for key words that might hint at the correct answer.
  • Manage Your Time Wisely: Keep track of time but don’t let it pressure you into rushing through questions. Use the process of elimination for multiple-choice questions to narrow down your options​​.
  • Stay Calm and Focused: If you feel anxious, take a moment to practice deep breathing exercises. Visualization techniques, where you imagine a positive outcome, can also help build confidence​​.

If You Don’t Pass

  • Reflect and Focus Your Study: Identify the sections that were challenging and devote more study time to these areas before attempting the exam again​.
  • Understand Retake Policy: Familiarize yourself with the policies regarding retakes, including any waiting periods and additional fees, to better prepare for your next attempt​.

By following these strategies and making use of available resources, you can approach the RHS exam with confidence. Remember, thorough preparation and a clear understanding of exam logistics are key to maximizing your potential for success.

Post-Exam: Next Steps

After you’ve completed the CDA DANB Radiation Health and Safety (RHS) exam, it’s essential to understand the significance of this achievement and plan your next steps carefully. The RHS exam is a pivotal component in becoming a Certified Dental Assistant (CDA) or achieving the National Entry-Level Dental Assistant (NELDA) certification. These certifications are crucial for your professional development in dental assisting, underscoring your commitment to maintaining high standards of care and showcasing your qualifications on a national level​.

Next Steps Post-Exam:

  1. Review Your Performance: Reflect on the exam experience. Identify areas where you felt strong and areas that were challenging. This insight can guide your continuous learning and professional development.
  2. Understand the Scoring and Results Process: After taking the RHS exam, results are typically mailed within one to three weeks. Familiarize yourself with the DANB’s scoring system, which requires a minimum score of 400 to pass. If you don’t achieve the passing score, review the most challenging sections and focus your studies there for a retake​​.
  3. Engage in Continuous Learning: The field of dental health is ever-evolving. Stay informed about the latest technologies, techniques, and best practices in dental radiography and health safety by engaging in continuous education and professional development opportunities.
  4. Network and Seek Mentorship: Join professional forums, such as the Student Doctor Network, to connect with peers and experienced professionals in radiology and dental assisting. Sharing experiences and seeking advice can offer valuable insights and motivate you to further your expertise in the field​.
  5. Manage Exam Stress and Prepare for Future Exams: Learning effective stress management and study techniques is crucial for your ongoing professional development and for any future exams you may undertake. Techniques such as deep breathing, keeping a positive mindset, and employing strategies to combat procrastination can significantly impact your study efficacy and test performance. It’s also beneficial to reach out for support if you find the stress overwhelming, with numerous resources available online for assistance​.
  6. Plan Your Career Path: Now that you have passed the RHS exam, consider your long-term career goals. Whether you aim to specialize further within dental assisting or pursue additional certifications, having a clear vision can guide your educational and professional choices.
  7. Maintain Certification: Be aware of the requirements to maintain your certification, including any continuing education credits or renewal processes, to ensure you remain in good standing as a certified professional.

By following these steps and utilizing the available resources and support systems, you can maximize the benefits of your RHS certification and continue to advance in your dental assisting career.


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  11. “DANB RHS Practice Test.” The DALE Foundation,
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