RSC Passing Score 2026: Exactly What You Need to Pass

What the Issuer Has and Has Not Published About Passing

If you searched for the exact number you need to pass the Radiation Safety Certification exam, here is the straight answer: no numeric passing score was verified in the retrieved Nuclear Medicine Technology Certification Board (NMTCB) sources for this exam. The current Radiation Safety exam information page, the 2017 content outline, and the 2026 newsletters describe the structure, eligibility, administration, and timing of the examination. None of them states a raw cut score, a scaled score, or a required percentage correct.

That matters because many candidates assume a round number like 70% or 75% and plan around it. Any figure like that, applied to this exam without issuer confirmation, would be a guess. The responsible approach is to treat the pass standard as unpublished, and to prepare for broad, defensible mastery rather than for a minimum threshold you cannot verify.

For a wider look at what candidates generally experience on this exam, see our guide on how hard the RSC exam is, and for the data-driven view of outcomes, see RSC pass rate: what the data shows.

Why Domain Weights Matter More Than a Cut Number

Since the pass standard is not published, the most actionable information you do have is how the exam is allocated. NMTCB lists five content areas with approximate percentages. These are printed with a tilde on the issuer's page, which means they are approximate allocations, not exact item quotas. You should not expect precisely 100 RAM License questions out of 200, for instance.

The expertise-versus-competence distinction in the content outline is not decoration. It signals depth. For the RAM License and CT areas, the outline treats you as someone who should command the material. For X-ray/fluoroscopy and MRI safety, it expects working competence but not expert-level depth. That should shape how much time you give each area. For a full breakdown of each content area, read RSC exam domains: complete guide to all 5 content areas.

Exam Mechanics That Affect Your Score

Your final result depends partly on knowledge and partly on how well you execute under the specific conditions of this exam. These administration details come from the issuer's current instructions.

• Length and time: 200 computer-based multiple-choice questions in 210 minutes. That works out to a little over a minute per question on average.
• Question format: Four or five answer options, with one correct answer.
• Closed book: Outside books and notes are prohibited. Authorized scratch paper is provided.
• Forced answers: An answer is required before you can advance. You can, however, mark questions for review and change answers later.
• Calculator: Bring a noiseless battery- or solar-powered calculator without alphabetic text-storage capability. Calculators are not supplied.
• Check-in items: Bring your admission letter and valid photo identification that matches your registration.

The forced-answer rule has a practical consequence: you cannot skip a question and come back to a blank. Instead, enter your best answer, mark it, and revisit. Because unanswered items are not an option at the point of advancing, there is no benefit to leaving anything for "later" without a placeholder response. And because the calculator must be one you bring yourself, a dead battery or a prohibited model is an avoidable risk to your score.

Historical Pass Reports: Reading Them Carefully

The only pass-outcome figures located in verified sources come from older NMTCB reporting, and they come with important caveats. An NMTCB report published in the Journal of Nuclear Medicine Technology (46(4), 9A, 2018) gives two cohorts:

There is a small discrepancy worth noting. For August 2018, the reported figure was 79%, but the counts of 51 of 65 imply roughly 78.46%. We are preserving the report as published rather than silently correcting it. The two numbers round differently, and the likely explanation is simply a rounding or reporting convention, but the source does not say.

One more nuance: candidates who sit this exam have already met demanding prerequisites, including an active qualifying credential held for at least two years and documented radiation-safety duties. That self-selected group may behave differently from a general exam population, which is another reason not to over-read the historical percentages.

Where Your Points Come From, Domain by Domain

Because you cannot target a published cut score, aim to be solidly strong in the areas the outline calls expertise and reliably competent in the rest. Here is how to think about each area, using only the outline's own framing.

For a structured way to move through all of this, our RSC study guide lays out an approach, and the RSC cheat sheet is useful for a final-week scan of must-know facts.

Eligibility, Fee, and Retake Rules That Raise the Stakes

Because a failed attempt carries real costs, understand the rules before you register. Passing matters more here than on exams you can retake the next month.

• Fee: The application/examination fee is USD 225 and is nonrefundable. See RSC certification cost for the broader pricing picture.
• Retake limit: A maximum of one attempt per twelve calendar months. A miss means a long wait, not a quick retest.
• Initial eligibility: A qualifying active NMTCB, ARRT(N/R/T), or CAMRT(RTNM/RT/RTT) credential held for at least two years, plus one calendar year of radiation-safety duties documented by supervisor or RSO attestation.
• RSO shortcut: A current or past-seven-year RSO/Associate RSO listing on a RAM license satisfies the duties requirement. The issuer's task examples are not an all-items checklist, so you do not need to have performed every example task.
• Provider: The exam is delivered by IQT, Inc. / Iso-Quality Testing at proctored testing centers.

The full prerequisite picture is covered in RSC requirements: eligibility, prerequisites, and how to qualify.

Sequencing Preparation Around the Weights

This is the one place we will talk about scheduling, and it is tied directly to the domain structure rather than to generic technique. The logic is simple: spend the most time where the outline expects the most depth and where the weight is highest, then use the remaining time to secure the competence-level areas.

Adjust the length of each phase to your background. A candidate who is already an RSO or Associate RSO will likely need less time in the first phase than a technologist who has never handled licensing questions. Timed practice matters particularly here because the forced-answer rule and the roughly one-minute-per-question pace reward steady decision-making. You can run realistic drills on our RSC practice test, and reviewing missed items by domain tells you whether your weak spot is in the high-weight area or a smaller one.

After a Pass: Results, Validity, and Recertification

Results are mailed in approximately four to six weeks, so do not expect an instant score at the test center. Once you hold the credential, a few facts shape what comes next.

• Designation: The official post-primary credential designation is NMTCB(RS). It is not CNMT and it is not NMTCB(CT).
• Validity: The credential is valid for ten years, with annual registration and fees.
• Recertification: At ten years, a qualifying RSO/Associate RSO listing on a RAM license, or attested radiation-safety duties within the preceding seven years, supports a USD 100 recertification application. Otherwise, re-examination applies. Expiration requires requalification and examination.
• Continuing education: Successful completion of the RS post-primary exam earns 24 CE under NMTCB policy. For those who also hold CNMT, the 24 CE every two years is a CNMT requirement, not an additional RS-only quota.
• Eligibility caveat: Initial admission includes radiography and therapy credentials, but the annual renewal and recertification wording remains nuclear-medicine-specific. Read it carefully if your primary credential is not NMTCB.

If you are weighing the payoff, our ROI analysis and salary guide discuss the value question. One honest note: broader workforce observations in NMTCB's summer newsletter do not establish an RS-specific salary premium, so be cautious about any claim that this credential alone commands a particular pay increase.

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