- RSC here means Radiation Safety Certification, issued by the NMTCB and written NMTCB(RS) after a holder's name.
- The exam has 200 multiple-choice questions in 210 minutes, and RAM license content is roughly half of it.
- Eligibility requires a qualifying primary credential held two years plus one year of documented radiation-safety duties.
- The application and examination fee is USD 225 and nonrefundable; only one attempt is allowed per twelve calendar months.
What the Credential Actually Is
Radiation Safety Certification is a post-primary credential from the Nuclear Medicine Technology Certification Board (NMTCB). "Post-primary" means it sits on top of a certification you already hold. It is not an entry-level route into imaging, and it is not a replacement for your primary credential. The official designation that follows a holder's name is NMTCB(RS), which is distinct from CNMT or NMTCB(CT).
The purpose is straightforward: to document that a technologist has the knowledge to carry out radiation-safety responsibilities, particularly those tied to a radioactive materials (RAM) license. Because the largest share of the exam concerns RAM license content, the credential speaks most directly to people who work with, or oversee, licensed radioactive materials.
A note on terminology: "RSC" is shorthand used on this site for Radiation Safety Certification only. Other credentials elsewhere in healthcare and industry share the same letters, so if you are comparing requirements, fees or dates, make sure the source you are reading is describing the NMTCB radiation safety credential. For quick definitions, see What Is RSC? and What Does RSC Stand For?.
Who Issues It and Who Delivers the Exam
Two organizations are involved, and it helps to keep them straight:
- NMTCB sets the eligibility rules, publishes the content outline, awards the credential and manages renewal and recertification.
- IQT, Inc. / Iso-Quality Testing provides the proctored testing-center delivery of the computer-based exam.
The detailed exam objectives come from the NMTCB Radiation Safety Certification Examination Content Outline (the 2017 final version, which remains linked from the current issuer instructions). A 2026 job task analysis has been discussed in NMTCB communications, but it is not a replacement published blueprint, so the outline above remains the reference for what is tested. Always confirm current details directly on the NMTCB radiation safety exam page before you apply.
Who Can Sit for It
Initial eligibility has two layers, and both must be satisfied.
Layer one: a qualifying primary credential
You need an active credential from one of these families, held for at least two years:
- NMTCB
- ARRT in nuclear medicine, radiography or radiation therapy: ARRT(N), ARRT(R) or ARRT(T)
- CAMRT in nuclear medicine, radiography or radiation therapy: CAMRT(RTNM), CAMRT(RT) or CAMRT(RTT)
Layer two: documented radiation-safety duties
You also need one calendar year of radiation-safety duties, documented by a supervisor or Radiation Safety Officer (RSO) attestation. A current RSO or Associate RSO listing on a RAM license, or one within the past seven years, satisfies the duties requirement. The issuer's examples of qualifying tasks are illustrations, not an all-items checklist, so you do not have to have performed every listed task.
For a full walkthrough of the prerequisites, see RSC Requirements 2026: Eligibility, Prerequisites & How to Qualify.
How the Exam Is Built and Delivered
| Feature | Detail |
|---|---|
| Delivery | Computer-based, proctored at testing centers |
| Questions | 200 multiple-choice items |
| Answer options | Four or five choices, one correct answer |
| Time allowed | 210 minutes |
| Reference materials | Closed book; no outside books or notes |
| Scratch paper | Authorized paper provided |
| Calculator | Bring your own: noiseless, battery or solar, no alphabetic text storage |
| Navigation | An answer is required before advancing; you can mark items and change answers later |
What to bring on test day
- Your admission letter
- Valid photo identification that matches your registration
- An approved calculator (none is supplied at the center)
The "answer required to advance" rule changes how you pace yourself. You cannot skip a question and come back to a blank, so when a calculation-heavy item stalls you, enter your best guess, mark it for review, and move on. At 200 questions in 210 minutes, you have a little over a minute per item, which makes marking and returning a practical necessity rather than a nicety.
If you are wondering how demanding that format feels in practice, How Hard Is the RSC Exam? covers difficulty in detail.
The Five Content Areas
NMTCB's outline distinguishes between areas where candidates are expected to show expertise and areas where they are expected to show competence without expertise. That distinction matters for how deeply you study each one. The percentages below are approximate issuer allocations (shown with a tilde on the NMTCB page), not exact item quotas, so the number of questions you see in each area can vary.
Domain 1: Content Pertaining to a RAM License (Expertise Area), approximately 50%
The anchor of the exam. Expect the licensing and program-administration side of radioactive materials use to carry the most weight, along with the practical safety questions that follow from it.
- Know what a RAM license requires of the people and programs operating under it.
- Be fluent in the RSO and Associate RSO role, since that listing is also a route to eligibility.
- Expect applied calculation-style questions, which is where your approved calculator earns its place.
Domain 2: Content Pertaining to CT (Expertise Area), approximately 15%
A second expertise area. CT safety is treated as something the credential holder should command, not merely recognize.
- Study CT-specific radiation safety and dose concerns at the depth of an expert, not a generalist.
- Be ready for scenario questions where the safest or most appropriate action must be chosen.
Domain 3: Content Pertaining to X-ray & Fluoroscopy (Competence but not expertise), approximately 15%
Here the outline asks for sound working competence rather than expert-level command. You should recognize hazards, protective principles and appropriate responses without needing the depth you bring to Domains 1 and 2.
Domain 4: Content Pertaining to MRI Safety (Competence, but not expertise), approximately 10%
Also a competence area. MRI safety involves hazards that differ fundamentally from ionizing-radiation concerns, so do not let your radiation-safety instincts do the thinking; study this domain on its own terms.
Domain 5: Optimizing Radiation Exposure / Other Topics, approximately 10%
The cross-cutting domain. It covers exposure optimization and a set of remaining topics that do not fit neatly elsewhere, so it rewards broad, steady review rather than a single deep dive.
Fees, Timing and Results
Fee
The application and examination fee is USD 225 and is nonrefundable. Treat submission as a commitment: make sure your documentation, especially the supervisor or RSO attestation, is in order before you pay. Broader cost considerations are covered in RSC Certification Cost 2026: Complete Pricing Breakdown.
Retake limits
The maximum is one attempt per twelve calendar months. There is no quick retest, which makes thorough first-attempt preparation more important than it is for exams with short retake waits.
Results
Results are mailed in approximately four to six weeks.
Scheduling status
The 2026 examination window ran August 13-15, with a July 1, 2026 eligibility deadline. As of this article's research date of October 15, 2026, both have passed. Earlier NMTCB news had announced August 14-16, but the current exam page and the later summer notice supersede that. No future sitting should be assumed; check the NMTCB radiation safety page for the next announced window. See RSC Exam Dates 2026 for scheduling context.
Passing score and pass rate: what is and is not known
The retrieved issuer sources did not verify a numeric passing score or a current pass rate, so this article does not state either. What does exist is historical reporting from NMTCB in the Journal of Nuclear Medicine Technology: a November 2017 cohort in which 55 of 68 candidates passed, reported as 81%, and an August 2018 cohort in which 51 of 65 passed, reported as 79%. The 2018 reported percentage differs slightly from the 78.46% that the counts imply, and that discrepancy is in the source itself. These were small, single-sitting cohorts from years ago and should not be treated as a current pass-rate estimate. For more, see RSC Pass Rate 2026: What the Data Shows and RSC Passing Score 2026.
Keeping the Credential Active
The credential is valid for ten years, with annual registration and fees along the way. The ten-year mark is where the pathway splits.
| Situation at ten years | Path |
|---|---|
| RSO/Associate RSO listing on a RAM license, or attested radiation-safety duties, within the preceding seven years | Recertification application (USD 100) |
| No qualifying listing or attested duties | Re-examination |
| Credential has expired | Requalification and examination |
Two continuing-education points are easy to misread:
- Passing the radiation safety exam earns 24 CE under NMTCB continuing competence policy.
- If you hold CNMT, the 24 CE every two years is a CNMT requirement. It is not an additional, verified quota specific to the RS credential.
Key Takeaway
Keep your radiation-safety work documented as you go. Because recertification hinges on a RAM license listing or attested duties within the preceding seven years, a running record of your role and your supervisor's contact is far easier to assemble in year three than in year ten.
Where It Fits in a Career
The credential is most naturally relevant to technologists who sit close to a facility's radiation safety program. Think of nuclear medicine departments, hospital and clinic settings that operate under a RAM license, and roles involving the RSO or Associate RSO function. Because the exam also covers CT, X-ray and fluoroscopy, and MRI safety, it signals breadth across modalities that a facility's safety program has to account for, not only nuclear medicine.
On compensation, be cautious. NMTCB's summer 2026 newsletter shares preliminary highlights from the 2026 NMTCB/SNMMI-TS Nuclear Medicine Salary and Workforce Study, but those are broad workforce observations. They do not establish a salary premium specific to the radiation safety credential, and the complete study was not retrieved. Anyone claiming a precise dollar uplift for NMTCB(RS) is going beyond what the verified sources support. For a measured discussion, see RSC Salary Guide 2026, RSC Jobs and Is the RSC Certification Worth It?.
Sequencing Your Preparation
Rather than a generic schedule, let the domain weights and the expertise-versus-competence split drive the order. A simple framework:
RAM License foundations
- Start with Domain 1 because it is roughly half the exam and underpins the rest.
- Practice calculation items with your approved calculator so the keystrokes are automatic.
CT at expert depth
- Treat Domain 2 as a second expertise area and study it more deeply than the competence domains.
Competence domains
- Cover X-ray and fluoroscopy, then MRI safety, aiming for sound working knowledge.
- Study MRI separately from ionizing-radiation habits.
Optimization and timed practice
- Fold in Domain 5, then run full-length timed sets at 200 questions in 210 minutes to rehearse the mark-and-return rhythm.
Because you only get one attempt per twelve calendar months, finish with timed practice that mirrors the real format. The full approach is laid out in the RSC Study Guide 2026, and a condensed refresher is available in the RSC Cheat Sheet. When you are ready to test yourself, the RSC practice tests let you rehearse across all five content areas.
It stands for Radiation Safety Certification, a post-primary credential awarded by the Nuclear Medicine Technology Certification Board and written NMTCB(RS). The same letters are used by unrelated credentials elsewhere, so always confirm you are reading about the NMTCB program.
Not necessarily. Initial eligibility accepts qualifying NMTCB, ARRT(N/R/T) or CAMRT(RTNM/RT/RTT) credentials held for at least two years, plus one year of documented radiation-safety duties. Renewal and recertification wording, however, remains nuclear-medicine-specific, so confirm maintenance rules with NMTCB.
The exam has 200 computer-based multiple-choice questions to be completed in 210 minutes. It is closed book, you must answer each question before advancing, and you can mark items for review and change answers.
Content pertaining to a RAM license, at approximately 50%. CT and X-ray/Fluoroscopy are each approximately 15%, while MRI safety and Optimizing Radiation Exposure/Other Topics are each approximately 10%. These are approximate allocations, not exact quotas.
It is valid for ten years with annual registration and fees. At ten years, qualifying RSO/Associate RSO listing or attested duties within the preceding seven years supports a USD 100 recertification application; otherwise re-examination applies.
For more background on the terminology and the credential itself, you can also browse What Is RSC Certification? and RSC Certification, and use RSC Exam Prep to practice the question style before your attempt.