100+ Free NMTCB(RS) Practice Questions

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According to 10 CFR 20, what is the annual occupational dose limit for the total effective dose equivalent (TEDE) to the whole body?

5 rem (0.05 Sv)

50 rem (0.5 Sv)

0.5 rem (5 mSv)

100 rem (1 Sv)

to track

2026 Statistics

Key Facts: NMTCB(RS) Exam

200

Total Questions

NMTCB RS exam specifications

3.5 hrs

Exam Time

NMTCB RS exam page

$225

Exam Fee

NMTCB fee schedule

10 yrs

Credential Validity

NMTCB recertification policy

301

Active Certificants

NMTCB (current)

50%

RAM License Domain

Content outline (heaviest)

The NMTCB(RS) exam uses 200 multiple-choice questions with a 3.5-hour time limit and $225 fee. Content weighting: RAM License (50%), CT (15%), X-Ray/Fluoroscopy (15%), MRI Safety (10%), Other Topics (10%). Offered once per year in August at IQT testing centers. Requires active NMT/RT credential for 2+ years plus 1 year documented radiation safety experience. Certification valid 10 years. 301 active certificants.

Sample NMTCB(RS) Practice Questions

Try these sample questions to test your NMTCB(RS) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1According to 10 CFR 20, what is the annual occupational dose limit for the total effective dose equivalent (TEDE) to the whole body?

A.5 rem (0.05 Sv)

B.50 rem (0.5 Sv)

C.0.5 rem (5 mSv)

D.100 rem (1 Sv)

Explanation: The NRC regulation 10 CFR 20.1201 establishes the annual occupational dose limit for TEDE to the whole body at 5 rem (0.05 Sv or 50 mSv). This limit applies to adult radiation workers and is a fundamental regulatory requirement that RSOs must enforce.

2What does the acronym ALARA stand for in radiation protection?

A.As Low As Reasonably Achievable

B.Absolute Lowest Allowable Radiation Amount

C.As Limited As Readily Available

D.Annual Limit for Authorized Radiation Activities

Explanation: ALARA stands for As Low As Reasonably Achievable. It is a fundamental radiation protection philosophy required by 10 CFR 20.1101 that mandates licensees use procedures and engineering controls to keep occupational and public doses well below regulatory limits.

3Which of the following is the correct half-life of Technetium-99m (Tc-99m)?

A.6 hours

B.12 hours

C.8 days

D.73 hours

Explanation: Technetium-99m has a physical half-life of approximately 6 hours (6.01 hours). This relatively short half-life makes it ideal for diagnostic nuclear medicine imaging because it allows sufficient time for imaging while limiting radiation dose to the patient.

4According to the inverse square law, if the exposure rate at 1 meter from a point source is 100 mR/hr, what is the exposure rate at 2 meters?

A.50 mR/hr

B.25 mR/hr

C.200 mR/hr

D.10 mR/hr

Explanation: The inverse square law states that radiation intensity is inversely proportional to the square of the distance. At 2 meters (twice the distance), the exposure rate is 100 × (1/2)² = 100 × 1/4 = 25 mR/hr. This principle is fundamental to radiation protection.

5What are the three fundamental principles of radiation protection for external sources?

A.Time, distance, and shielding

B.Containment, ventilation, and monitoring

C.Dose, dose-rate, and activity

D.Detection, measurement, and recording

Explanation: The three cardinal principles of radiation protection for external radiation sources are time (minimize exposure duration), distance (maximize distance from the source), and shielding (use appropriate barriers). These principles form the foundation of the ALARA philosophy.

6Under 10 CFR 35, what is the definition of a medical event involving a radiopharmaceutical therapy?

A.A dose that exceeds 0.05 Sv (5 rem) to an unintended organ or tissue

B.Any dose that exceeds the prescribed amount by more than 5%

C.Any radiation exposure to a member of the public

D.A dose that exceeds 0.01 Sv (1 rem) to any organ

Explanation: Under 10 CFR 35.3045, a medical event occurs when a dose to an organ or tissue other than the treatment site exceeds 0.05 Sv (5 rem) and exceeds 50% of the prescribed dose to that site. Medical events must be reported to the NRC within specific timeframes.

7What type of radiation does Iodine-131 primarily emit that makes it useful for thyroid therapy?

A.Alpha particles

B.Beta particles

C.Neutrons

D.Positrons

Explanation: Iodine-131 primarily emits beta particles (beta-minus) with a maximum energy of 0.606 MeV, which provide the therapeutic effect for thyroid ablation. I-131 also emits gamma rays (364 keV), which allow for post-therapy imaging but contribute to radiation safety concerns.

8What is the annual dose limit for the lens of the eye for occupational radiation workers under current NRC regulations?

A.15 rem (0.15 Sv)

B.5 rem (0.05 Sv)

C.50 rem (0.5 Sv)

D.1 rem (0.01 Sv)

Explanation: Under 10 CFR 20.1201, the annual occupational dose limit for the lens of the eye is 15 rem (0.15 Sv). Note that the ICRP has recommended lowering this to 2 rem/year (20 mSv/year), but the NRC has not yet adopted this recommendation.

9What is the purpose of a wipe test (swipe test) in a nuclear medicine department?

A.To detect removable radioactive contamination on surfaces

B.To calibrate the dose calibrator

C.To measure ambient radiation exposure rates

D.To verify the identity of a radiopharmaceutical

Explanation: A wipe test (swipe test) is used to detect removable radioactive contamination on surfaces. A filter paper or cotton swab is wiped over a 100 cm² area and counted in a well counter. This is required at regular intervals in areas where radioactive materials are used.

10Which of the following is the correct DOT shipping label for a package containing radioactive material with a transport index greater than 1 but not exceeding 10?

A.Radioactive White-I

B.Radioactive Yellow-II

C.Radioactive Yellow-III

D.Radioactive Red-IV

Explanation: A Radioactive Yellow-III label is required for packages with a transport index (TI) greater than 1 but not exceeding 10. The TI is the maximum radiation level in mrem/hr at 1 meter from the package surface. White-I has a TI of 0, Yellow-II has a TI up to 1.

About the NMTCB(RS) Exam

The NMTCB(RS) credential certifies radiation safety expertise for nuclear medicine and radiology professionals. The exam covers RAM (radioactive materials) license management including NRC regulations and radionuclide therapy (50%), CT dose metrics (15%), X-ray and fluoroscopy safety (15%), MRI safety zones and hazards (10%), and additional safety topics including Image Wisely/Gently and special populations (10%). This credential supports RSO (Radiation Safety Officer) knowledge but does not confer NRC RSO designation.

Questions

200 scored questions

Time Limit

3 hours 30 minutes

Passing Score

Criterion-referenced (not publicly disclosed)

Exam Fee

$225 (NMTCB)

NMTCB(RS) Exam Content Outline

50%

RAM (Radioactive Materials) License

Radiation physics, dosimetry, ALARA, 10 CFR 19/20/35/71, DOT regulations, radionuclide therapy, emergency procedures, spill response, medical events

15%

Computed Tomography

CT physics, CTDI/DLP/SSDE, diagnostic reference levels, dose optimization, deterministic vs stochastic effects

15%

X-Ray and Fluoroscopy

Fluoroscopy dose metrics, peak skin dose, DAP, high-dose interventions, SRDL

10%

MRI Safety

Magnetic field units, 5-Gauss line, zone I-IV definitions, MR Safe/Conditional/Unsafe labeling, quenching, RF hazards, SAR

10%

How to Pass the NMTCB(RS) Exam

What You Need to Know

Passing score: Criterion-referenced (not publicly disclosed)
Exam length: 200 questions
Time limit: 3 hours 30 minutes
Exam fee: $225

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

NMTCB(RS) Study Tips from Top Performers

1RAM License is 50% of the exam — master 10 CFR 20 (dose limits), 10 CFR 35 (medical use), emergency procedures, and radionuclide therapy protocols

2Know occupational dose limits: 5 rem/year whole body, 50 rem/year extremities, 0.5 rem/year fetus

3Understand MRI safety zones I-IV and MR labeling (Safe/Conditional/Unsafe) — 10% of the exam

4Study CT dose metrics (CTDI, DLP, SSDE) and fluoroscopy dose metrics (DAP, peak skin dose) — 30% combined

Frequently Asked Questions

How many questions are on the NMTCB(RS) exam?

The exam contains 200 multiple-choice questions with 4-5 answer options. You have 3 hours 30 minutes. The exam is offered once per year in August.

Does passing the NMTCB(RS) make me an RSO?

No. The NMTCB(RS) credential demonstrates radiation safety knowledge but does NOT grant the title of RSO or NRC recognition as an RSO. RSO designation is a separate NRC process under 10 CFR 35.

What are the prerequisites?

Active CNMT, ARRT(N/R/T), or CAMRT credential held for 2+ years, plus 1 year documented radiation safety experience (or current/recent RSO listing on a RAM license).

When is the 2026 exam?

August 13-15, 2026. Application deadline is July 1, 2026. The exam is offered once per year only.