IRRSP Cheat Sheet 2026: One-Page Review of Must-Know Facts

Exam Snapshot: The Numbers That Matter

Before you review a single domain, lock in the mechanics of the Industrial Radiography Radiation Safety Personnel - X-Ray (IRRSP) exam itself. ASNT Certification Services LLC, the credentialing arm of the American Society for Nondestructive Testing headquartered in Houston, Texas, administers the program. The written exam is computer-based, delivered through Pearson VUE test centers or ASNT Authorized Exam Centers (ASNT Houston in Houston, Texas, and Applied Technical Services in Marietta, Georgia).

• Format: 100 multiple-choice questions
• Time limit: 3 hours
• Passing score: 70% or better
• XR exam fee: $300 (ASNT members) / $325 (nonmembers)
• Retake fee: $260 member / $285 nonmember
• Recertification fee: $300 member / $325 nonmember (same as initial)

If you want a deeper walkthrough of every fee and when it applies, the IRRSP Certification Cost breakdown covers the full pricing structure line by line. And if you're still deciding whether the passing bar is realistic for your background, see the dedicated IRRSP Passing Score guide.

The Seven Domains at a Glance

Every question on your exam maps to one of seven topical areas. ASNT doesn't publish official weighting percentages, so don't chase a made-up formula - instead build competence across all seven and give extra time to the one area everyone underestimates (more on that below).

For a full breakdown of each domain with study priorities, the IRRSP Exam Domains Guide goes deeper than a cheat sheet can.

Why Regulations Dominates the Body of Knowledge

ASNT does not release exact percentage weights per topical area, but candidates and instructors consistently identify Regulations (Domain 6) as by far the deepest section of the body of knowledge. It spans an unusually wide list of subtopics:

• Definitions used throughout licensing and registration language
• Licensing and registration requirements
• Notices, reports, and records obligations
• Labeling requirements
• Boundaries and posting rules
• Maximum allowable dose limits
• Personnel training requirements
• Transportation of radiographic sources and equipment
• Surveys and monitoring obligations
• Exposure equipment and storage requirements

Because this section touches Title 10 Part 34 of the Code of Federal Regulations and the Suggested State Regulations for Control of Radiation (Parts A, E, H, and T), it rewards memorization plus comprehension - you need to know both the rule and why it exists. Acceptance of the certification is ultimately at each individual state's discretion, which is one more reason regulatory literacy matters beyond just passing the exam.

Eligibility Math: Hours, Days, and Sign-Offs

Before you can even sit for the CBT, you need documented eligibility, verified by a Radiation Safety Officer (RSO) or company personnel officer:

• Radiography experience: 120 hours or 18 days
• Radiation safety training: 40 hours or 6 days
• Definition of a "day": at least seven hours

These thresholds are specific to the X-ray track. The RAM (gamma) exam requires substantially more experience - 200 hours or 29 days - because of the differing risk profile of sealed source work. Combination candidates must satisfy the higher bar. If your paperwork doesn't add up cleanly, review the IRRSP Requirements guide before you submit anything through MyCert.

Fees, MyCert, and the One-Year Clock

Applications go through ASNT's MyCert portal and require a color headshot and a signed Code of Ethics. Processing typically takes 2-4 weeks. Once you receive your Letter of Approval, the clock starts:

• All exams must be scheduled and completed within one year of the Letter of Approval
• Cancellations require at least 48 hours advance notice
• The completed practical exam form must be submitted within six months of your CBT date

Miss either window and you risk having to restart part of the process. For a full month-by-month look at how these deadlines interact with test center availability, see IRRSP Exam Dates 2026.

The Practical Exam and Visual Acuity Piece

Passing the 100-item CBT is only half the certification requirement. You also need:

• An employer-conducted practical examination, administered by a current RSO or their designee
• A visual acuity examination

Certification is not conferred until every requirement - written exam, practical exam, and visual acuity - is complete and the practical exam form is submitted within six months of your CBT date. Candidates sometimes pass the written portion and then let the practical paperwork lapse; treat that six-month window as seriously as the exam date itself.

What the Questions Actually Look Like

The XR exam is entirely multiple-choice, single-best-answer format, delivered on a computer under proctored, in-person conditions. There's no simulation component and no open-ended written response - every item has four answer choices and one correct selection. Expect a mix of:

• Direct recall items (definitions, dose limits, regulatory citations)
• Applied scenario items (given a boundary or exposure situation, choose the correct response)
• Calculation-style items involving distance, time, or dose relationships

If you miss the 70% threshold, you're not left guessing why - the analysis sheet you receive breaks down the percentage missed in each major category of the body of knowledge, which is genuinely useful diagnostic information for a retake attempt. For a broader discussion of how challenging candidates find the exam in practice, read How Hard Is the IRRSP Exam? and the companion IRRSP Pass Rate analysis.

A Compressed Last-Week Review Plan

If you're using this cheat sheet in the final stretch before your CBT date, don't try to relearn everything evenly. Sequence your remaining days around domain density and your own weak spots.

For a longer-range version of this plan built around your actual start date, see the IRRSP Study Guide 2026. Running a few timed simulations on our practice test platform before exam day is one of the fastest ways to convert this cheat sheet into real recall speed.

Retake Rules and the 20-Hour Penalty

Retakes cost less than the initial attempt ($260 member / $285 nonmember), but ASNT caps how many attempts you get before extra remediation kicks in. Candidates who fail more than three attempts within a one-year period must:

• Document 20 additional hours of radiation safety training, as determined by their RSO
• Wait six months before reapplying

This makes the analysis sheet from a failed attempt genuinely valuable - use it to target the exact category where you lost the most points rather than re-reviewing everything uniformly.

Recertification: Five Years, By Exam Only

The IRRSP credential is valid for five years and is recertified by examination only - there's no continuing-education-only path. Applications for recertification are accepted up to six months before your expiration date and are required at least 60 days before it expires. The recertification exam fee mirrors the initial fee: $300 for members, $325 for nonmembers.

Because recertification requires passing the same 100-item, 3-hour exam again, treating this cheat sheet as a living reference - not a one-time cram tool - pays off five years down the road. If you're evaluating whether the ongoing time and fee commitment is worthwhile for your career path, Is the IRRSP Certification Worth It? walks through the tradeoffs, and the IRRSP Salary Guide looks at how the credential fits into radiography career progression.

If any of the terminology in this cheat sheet is still unfamiliar, start with the basics: What Is IRRSP?, IRRSP Meaning, and IRRSP Training options that build toward eligibility. You can also run a free set of sample questions on the main practice test site to see where you stand before committing to a test date.

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