RMT Passing Score 2026: Exactly What You Need to Pass

The Number: 70% on 75 Questions

The National Radon Safety Board (NRSB) states a passing score of 70% for the Radon Measurement Technician exam. The exam is 75 single-best-answer multiple-choice questions delivered in 90 minutes. That is the whole scoring rule the issuer publishes: one threshold, one question format, one clock.

This article is about the NRSB Radon Measurement Technician credential only. It is not the NRPP measurement-focused credential, not a state-specific technician exam, and not a massage-therapy credential that happens to share the same letters. If you are still sorting out which credential is which, start with What Is RMT? or What Does RMT Stand For? before you plan around any score.

What 70% Means in Practice

NRSB publishes the percentage, not a raw cut score for the current exam. If you apply 70% to 75 questions you get 52.5, which means a candidate would need at least 53 correct answers if every question counts equally. That arithmetic is a reasonable planning target, but it is your own calculation, not a number NRSB prints on the current exam page. Treat 53 as a working goal and the stated 70% as the rule.

Two things the published materials do not tell you, so do not assume them:

• Whether every question is scored. The study guide's subject table is not an unscored-item breakdown, so there is no basis for guessing how many items might not count.
• How a score is scaled, if at all. No scaling method is published. Plan for 70% of what you answer, with no safety margin built into the rules.

The practical takeaway is to aim well above the line. A candidate who consistently scores in the high 70s or 80s on realistic practice questions has a cushion against a few unfamiliar items. You can build that cushion with timed sets on the RMT practice test site.

The Old 53-of-75 Wording

If you search NRSB's site long enough you may find an older course page, revised July 1, 2001, that describes a closed-book exam with a 53-of-75 passing criterion. That figure matches the 70% arithmetic above, which is why it can look reassuring. But it comes from legacy wording and should not be treated as the current rule.

Do not substitute that page for the current delivery rules. In particular:

• The legacy "closed-book" language conflicts with today's permitted tools (scrap paper, on-screen calculator, formula sheet and digital notepad).
• The live 70% statement and the current logistics page govern the exam you will actually take.
• If a source and the current NRSB exam page disagree, follow the current page and ask NRSB directly when something matters to your plan.

Format, Fees and Proctoring Rules

The score is only meaningful alongside the conditions under which you earn it. Here is what the current exam-logistics information specifies.

The fee is paid separately from certification and training costs. For the full picture of what a candidate pays across the whole path, see the RMT certification cost breakdown.

Equipment problems can cost you the fee

Because the exam is proctored live online and the fee is nonrefundable, a failed system check on exam day is an expensive way to learn your laptop does not meet the Proctor360 requirements. Run the system requirements check well before your appointment, use a personal machine, and do not plan on a work laptop with locked-down security software. Since appointments cannot be changed inside 24 hours, last-minute fixes are not an option.

The formula sheet and on-screen calculator are real aids, but they only help if you have practiced with them. Spend practice time doing calculations on a basic on-screen calculator rather than a physical one, and rely on the provided formula sheet instead of memorizing everything blind.

Where the Points Come From

NRSB's study guide includes an official subject-area table for the Radon Measurement Technician exam on printed page 3. It lists six domains with published counts. These are classification counts, not percentage weights, and they add up to 77 across 75 questions because some questions cover more than one subject.

Do not convert those counts into percentages and then into "I can skip Domain 6." The table does not say how any individual question is scored, and a single 70% threshold applies to the whole exam. What the counts do tell you is where the exam concentrates its attention. For a deeper walk through each area, see the complete guide to all 6 RMT content areas.

One caution about sources: the study guide also lists a separate ten-part course-provider syllabus on pages 3-6. Those curriculum headings are unweighted preparation topics. They do not establish an official ten-domain exam, and they do not prove exhaustive exam coverage. Use the six-domain table as your exam map and the curriculum headings as background reading.

Passing Is Only the Middle Step

A 70% score earns you a passing exam result, not the credential. Standard entry requires several things beyond the test:

1. Approved initial measurement training.
2. A passing exam result.
3. A signed application and ethics agreement.
4. Affiliation with an NRSB-registered business.
5. Approved device details.
6. Identification of the RMS or ARL that performs analysis and signs reports.

Certification itself costs USD 125 for one year or USD 200 for two years, separate from the exam fee and training. Candidates sorting out eligibility should read the RMT requirements guide.

The alternate route skips the exam, with conditions

NRSB also describes an alternate application route that accepts a current state radon license or NRPP certificate plus CE certificates from the current renewal period, in place of the initial course and exam. Other application requirements still apply, and this is not automatic reciprocity. If you already hold one of those qualifications, the passing score may not be your concern at all, but confirm eligibility with NRSB first.

What the credential allows, and what it doesn't

An RMT places and retrieves devices under an active quality-assurance program supervised by an RMS or ARL. The study guide permits QA program oversight for self-provided measurement services only, not for other measurement, laboratory or chamber services, and the initial application still requires an RMS-designed QA plan. That self-service exception does not give an RMT analysis or report-signing authority. Hiring and role questions, including who employs RMTs, are covered in the RMT jobs overview.

Retakes, Validity and Scheduling Limits

The rules around a failed or delayed attempt are specific:

• Retake wait: a failed candidate may register again after 14 days.
• Fee exposure: the USD 120 fee is nonrefundable, so each attempt is a fresh cost.
• Result shelf life: a passing result remains valid for certification application for one year. If you pass but delay the training, business affiliation or paperwork, the clock is running.
• Appointment locks: no cancellation or change within 24 hours.

The one-year validity window is the detail candidates most often overlook. Sequence your training, business affiliation and application documents so that a passing result does not expire before you submit. For scheduling specifics, see the RMT exam dates guide.

Published guidance does not give a pass-rate figure for this exam that you can rely on, so be skeptical of any site quoting one with confidence. The RMT pass rate article explains what can and cannot be said from the available data, and How Hard Is the RMT Exam? addresses difficulty without inventing numbers.

A Domain-Ordered Prep Plan

The only generic planning advice worth including is this: order your weeks by the published subject counts, then use practice questions to find where you fall below the 70% line. A four-week example, assuming you have already completed approved training:

For a fuller approach to materials and sequencing, the RMT study guide and the one-page RMT cheat sheet are good companions. Finish with full-length timed attempts on the RMT practice exam site so the 90-minute pace and the on-screen tools feel routine before the proctored session.

Frequently Asked Questions