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Radiation Health and Safety (RHS) Exam
Find the current format, timing, scoring, fees, eligibility, and testing options for RHS, with direct links to official sources.
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Questions75 multiple-choice questions (computer-adaptive)
Testing time60 minutes
ScoringMinimum passing scaled score of 400 required (scale 100-900); computer adaptive testing scored on difficulty of questions answered correctly; cut score set via modified Angoff standard setting
Exam feeUSD 270 traditional candidate / USD 265 active military personnel (2026 application packet; includes USD 75 nonrefundable application fee)
Prep options
Study resources for RHS
Independent prep
Courses and study resources
Exam overview
What to know before choosing your prep
- Who runs it
- DANB
- Category
- Dental Professions
- Current version
- RHS Exam Outline and References, effective March 12, 2025 (© 2025 DANB)
- Where it applies
- United States — national
- Exam languages
- English, Spanish, Vietnamese
- Score scale
- 100-900 (minimum passing scaled score 400)
- Testing provider
- Pearson VUE
- Format
- Computer-based (CAT); in-person at a test center or by remote online proctoring
- Availability
- 60-day testing window from application approval (2026 applications accepted through Dec. 31, 2026)
- Results
- Email notification within 1-3 business days after the exam that results are available in the online DANB account
- Remote testing
- Available
Exam structure
3 scored domains: I. Purpose and Technique (50%); II. Radiation Characteristics and Protection (25%); III. Infection Prevention and Control (25%); digital radiography only (no film-based concepts since July 7, 2022)
Where rules vary
National knowledge standard for dental radiography competence; individual state dental boards decide which duties may be delegated to dental assistants and how the RHS credential is recognized.
Eligibility
None — no eligibility requirements to take the RHS exam