- Overview: Who Certifies the CHP and Why It Matters
- Part I Eligibility: Who Can Sit for the Exam
- Part II Eligibility: Experience, Education, and Documentation
- Application Mechanics and Fees
- Exam Format Requirements for Both Parts
- Mapping Requirements to the Five Exam Domains
- The Seven-Year Clock Between Part I and Part II
- Recertification Requirements Every Four Years
- Planning Your Path: A Realistic Timeline
- Frequently Asked Questions
- Part II requires six years of health physics experience, including three years applied, plus a radiation protection report.
- Part I is a 150-question, five-option multiple-choice exam with a cut score around 95 correct.
- Part II is a six-hour closed-reference exam: six core questions plus four of eight specialty problems, 469/700 points to pass.
- Candidates have seven years to pass both parts after starting the process.
Overview: Who Certifies the CHP and Why It Matters
The Certified Health Physicist (CHP) credential is administered by the American Board of Health Physics (ABHP), operating under the American Academy of Health Physics (AAHP). Unlike many technical certifications that require a single exam, CHP certification is a two-part gate: Part I establishes fundamental competency, and Part II verifies that a candidate can apply that competency to real radiation protection problems after years of professional practice. If you're still asking what is CHP or trying to pin down the CHP meaning in a job posting, understand this upfront: it is not an entry-level credential. It's a career-stage certification that signals you've moved from technician to practicing health physicist capable of independent judgment.
Employers hiring for radiation safety officer roles, nuclear facility health physics positions, federal regulatory jobs, and consulting positions often list CHP as preferred or required. If you're researching CHP jobs, you'll notice the credential appears disproportionately in postings tied to Department of Energy contractors, hospitals with large radiation oncology programs, and nuclear power operators - places where an incorrect dose calculation or shielding decision has real consequences.
Part I Eligibility: Who Can Sit for the Exam
Part I eligibility is intentionally broader than Part II. It's designed to test whether you have the fundamental technical grounding - math, physics, radiation detection theory, and basic regulatory knowledge - before you're allowed to attempt the far more demanding practical exam. Most candidates pursuing Part I hold a bachelor's or graduate degree in physics, health physics, nuclear engineering, or a closely related science, along with coursework covering radiation physics, statistics, and instrumentation.
Because Part I doesn't require the same years of documented professional experience as Part II, many candidates sit for it while still early in their careers or even while finishing graduate coursework, banking the credential milestone for later. This staged approach is common enough that ABHP effectively expects it - the two-part structure exists precisely so that academic knowledge and field experience can be verified separately.
What "Eligible" Really Means for Part I
Eligibility for Part I is less about a checklist and more about whether your educational background covers the breadth tested across all five domains.
- Formal coursework or equivalent self-study in radiation physics and dosimetry
- Working knowledge of detection instrumentation and counting statistics
- Familiarity with U.S. regulatory structure (NRC, DOE, state agreements)
- Comfort with applied math under timed conditions - no reference material is a crutch here
Part II Eligibility: Experience, Education, and Documentation
Part II is where the CHP credential earns its reputation. Eligibility generally requires six years of professional health physics experience, with at least three of those years classified as applied experience - meaning hands-on work solving real radiation protection problems rather than purely academic or administrative duties. This isn't a box you check by having a job title; ABHP reviews the substance of what you actually did.
Beyond the experience requirement, candidates must submit:
- Qualifying education that demonstrates a formal foundation in health physics or a closely related discipline
- Professional references who can attest to your applied experience and competence
- A radiation protection report - a substantive written work product documenting a real problem you solved, the methodology you used, and the outcome
The radiation protection report deserves special attention because it's frequently underestimated. It's not a formality - reviewers use it to judge whether your applied experience claim holds up. Candidates who wait until the last minute to assemble this documentation often discover gaps in their record that require going back to old employers or projects to reconstruct details.
Key Takeaway
Start collecting your radiation protection report material and reference contacts at least a year before you plan to apply for Part II - reconstructing years-old project details under deadline pressure is avoidable with early documentation.
Application Mechanics and Fees
The financial and administrative mechanics differ substantially between the two parts, and understanding them helps you budget and plan realistically.
| Item | Part I | Part II |
|---|---|---|
| Application fee | $100 | $250 |
| Registration fee | $150 | $500 |
| Test-site fee | Separate, additional | Included in exam administration |
| Format | Computer-based via Pearson VUE | Closed-reference written exam |
| Duration | 3 hours | 6 hours |
Note that Part I requires a separate test-site fee on top of the application and registration costs, which candidates sometimes overlook when budgeting. For a full breakdown of every cost associated with pursuing the credential - including recertification and membership dues - see the CHP Certification Cost 2026 breakdown.
Exam Format Requirements for Both Parts
Meeting eligibility requirements gets you to the testing room, but the exams themselves demand very different skills. Part I is a Pearson VUE computer-based exam: 150 five-option multiple-choice questions in three hours. The cut score is statistically set and has typically landed around 95 correct answers - meaning you need roughly two-thirds accuracy across a broad, fast-moving question set covering all five domains.
Part II is a different animal entirely. It's a six-hour closed-reference exam requiring written responses to six core questions plus four of eight specialty problems you select. Passing requires 469 of 700 total points. There's no guessing your way through multiple-choice options here - you have to show complete calculations, cite correct methodology, and often justify assumptions, all without open reference materials to lean on.
Mapping Requirements to the Five Exam Domains
Because eligibility is really a gateway to content mastery, it helps to understand exactly what you're qualifying yourself to be tested on. Both exam parts draw from the same five weighted domains, though Part I tests them in multiple-choice form and Part II tests them through applied written problems.
Domain 1: Measurements and Instrumentation (25%)
The heaviest-weighted domain. Candidates must master detector theory, counting statistics, calibration procedures, and instrument selection for different radiation types and field conditions.
- Gas-filled detectors, scintillators, and semiconductor detectors
- Efficiency calculations and minimum detectable activity
- Dosimetry instrumentation and calibration traceability
Domain 2: Standards and Requirements (20%)
Covers the regulatory backbone: NRC regulations, DOE orders, ALARA principles, and dose limit frameworks that every practicing health physicist applies daily.
- 10 CFR Part 20 dose limits and reporting thresholds
- License conditions and regulatory agency roles
- ALARA program requirements and documentation
Domain 3: Hazards Analysis and Controls (20%)
Focuses on identifying radiation hazards and designing appropriate engineering and administrative controls.
- Shielding design calculations
- Contamination control and internal dosimetry
- Emergency response and criticality safety basics
Domain 4: Operations and Procedures (20%)
Tests real-world program management: survey procedures, waste handling, transportation regulations, and facility operations.
- Radioactive waste classification and disposal
- Transportation packaging and labeling requirements
- Routine survey and monitoring program design
Domain 5: Fundamentals and Education (15%)
The foundational science underpinning everything else - atomic and nuclear physics, radioactive decay, and interaction of radiation with matter.
- Decay chains and activity calculations
- Radiation interaction mechanisms with matter
- Biological effects and dose-response fundamentals
For a full walkthrough of how these domains break down further into subtopics and question examples, the CHP Exam Domains 2026 complete guide is worth reading before you finalize a study plan.
The Seven-Year Clock Between Part I and Part II
One requirement that catches candidates off guard: you must pass both Part I and Part II within seven years. This isn't seven years from when you start studying - it's a formal window tied to your first passed exam. If you pass Part I early in your career and then spend years accumulating the required applied experience for Part II, that clock is running the entire time.
This makes timing decisions strategic. If you're several years away from meeting the six-year experience requirement (with three years applied), you may want to delay sitting for Part I until you're closer to Part II eligibility, rather than banking a Part I pass that could expire before you're ready for Part II. Conversely, if you already meet or nearly meet the experience requirement, there's little reason to wait.
Key Takeaway
Calculate your projected Part II eligibility date before scheduling Part I - passing Part I too early relative to your experience timeline risks running against the seven-year deadline.
Recertification Requirements Every Four Years
Earning the CHP is not a one-time event. Recertification is required every four years and depends on two things: maintaining active AAHP membership and accumulating 80 continuing education credits over the recertification period. This structure means the credential rewards continuous engagement with the field - attending conferences, completing relevant coursework, and staying current with regulatory changes - rather than a credential you earn once and file away.
Practically, this means budgeting time and money for professional development on an ongoing basis after certification, not just during the exam preparation phase. Employers who value the CHP designation understand this ongoing commitment, which is part of why the credential carries weight in hiring and promotion decisions. If you're weighing whether the total time and financial investment is worthwhile relative to career payoff, the Is the CHP Certification Worth It ROI analysis walks through that calculation, and the CHP Salary Guide covers how the credential tends to affect compensation.
Planning Your Path: A Realistic Timeline
Because CHP eligibility is tied to career milestones rather than just study hours, your planning timeline should work backward from your experience accumulation, not just your exam date. That said, once you're within striking distance of eligibility for either part, a domain-aware study schedule makes a measurable difference given how content-heavy the exams are.
Confirm Eligibility and Gather Documentation
- Verify your applied experience hours against Part II requirements
- Begin collecting reference contacts and report material early
- Review the application and registration fee schedule for the part you're targeting
Domain-by-Domain Review
- Start with Measurements and Instrumentation given its 25% weight
- Layer in Standards and Requirements and Hazards Analysis and Controls
- Use practice questions to identify weak domains early, not the week before the exam
Applied Practice and Timed Simulation
- For Part I, drill timed 150-question sets to build pacing under the 3-hour limit
- For Part II, practice full written responses to specialty problems under closed-reference conditions
- Review the required passing thresholds so you know exactly what target score you're working toward
For a structured, domain-weighted study plan with more detail than a high-level timeline, see the CHP Study Guide 2026: How to Pass on Your First Attempt. And if you're still calibrating how difficult this exam actually is relative to your background, the How Hard Is the CHP Exam difficulty guide gives an honest assessment before you commit months of preparation.
Whatever timeline you land on, running consistent practice questions against realistic exam conditions on our CHP practice test platform is one of the most reliable ways to convert domain knowledge into exam-day performance, since the format - five-option multiple choice under time pressure - rewards familiarity as much as raw knowledge.
Frequently Asked Questions
There's no single mandated degree, but candidates typically need a strong science background - physics, health physics, nuclear engineering, or a related field - with coursework covering radiation physics, instrumentation, and statistics, since Part I tests all five domains broadly.
Generally no. Part II eligibility requires six years of professional health physics experience, including three years of applied experience, along with qualifying education, references, and a radiation protection report submitted as part of the application.
The seven-year window is a firm requirement for completing both Part I and Part II. Candidates who don't pass both within that timeframe typically need to restart the process, which is why timing your Part I attempt relative to your Part II eligibility matters.
No. It's a substantive written document describing a specific radiation protection problem you solved, including your methodology and outcome. It's evaluated on technical substance, not just as a summary of job duties.
Yes. Recertification occurs every four years and requires both active AAHP membership and 80 continuing education credits accumulated during that period, making it an ongoing professional commitment rather than a one-time achievement.