PracticeVideosBlogFlashcardsEspañol
All Practice Exams

Free Practice Questions for CNMT

Exam-style questions and explanations by OpenExamPrep.

✓ No registration✓ No credit card
Exam pass rate: 82.22%
114+ Questions
100% Free

Loading practice questions...

Same family resources

Explore More NMTCB Nuclear Medicine Certifications

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

NMTCB(CT) Computed Tomography Specialty

Practice Questions

NMTCB(RS) Radiation Safety Specialty

Practice Questions

NMTCB NCT Nuclear Cardiology Technologist

Practice Questions

NMTCB NMAA Nuclear Medicine Advanced Associate

Practice Questions

NMTCB PET Positron Emission Tomography Specialty

Practice Questions
Exam Review

Key Facts: CNMT Exam

90

Exam Questions

NMTCB

1h 55m

Time Limit

NMTCB

375

Scaled Passing Score

NMTCB

$200

Exam Fee

NMTCB

82.22%

2025 Overall Pass Rate

NMTCB

The entry-level CNMT exam is a 90-question computer-adaptive test with a 1-hour-55-minute limit and a 375 passing score on the 200-500 scale. The current COPS blueprint is Physics 7%, Safety 13%, Pharmaceutical Agents 25%, Instrumentation/QC 15%, and Clinical Procedures 40%.

Sample CNMT Practice Questions

Try these sample questions to review concepts for the CNMT exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 114+ question experience with AI tutoring.

1Which radionuclide is most commonly used for myocardial perfusion imaging?
A.Tc-99m
B.I-131
C.Ga-67
D.In-111
Explanation: Tc-99m (technetium-99m) is the most widely used radionuclide for myocardial perfusion imaging due to its ideal gamma energy of 140 keV, short half-life of 6 hours, and excellent availability from Mo-99/Tc-99m generators. Agents like Tc-99m sestamibi and Tc-99m tetrofosmin are standard for cardiac SPECT.
2What is the primary function of a collimator on a gamma camera?
A.To amplify the gamma ray signal
B.To convert gamma rays into visible light
C.To define the direction of accepted gamma rays for image formation
D.To shield the patient from scatter radiation
Explanation: A collimator is placed in front of the gamma camera detector to accept only gamma rays traveling in specific directions, typically perpendicular to the detector face. By rejecting photons from other angles, the collimator provides spatial information necessary for image formation. Without it, the detector would register photons from all directions and produce a featureless image.
3A nuclear medicine technologist is preparing a dose of Tc-99m MDP. What type of procedure is this radiopharmaceutical used for?
A.Thyroid imaging
B.Bone scintigraphy
C.Renal function study
D.Lung ventilation scan
Explanation: Tc-99m MDP (methylene diphosphonate) is a bone-seeking radiopharmaceutical used for skeletal scintigraphy. It localizes in areas of increased osteoblastic activity, making it valuable for detecting bone metastases, fractures, infection, and other skeletal pathology. Thyroid imaging uses Tc-99m pertechnetate or I-123, renal studies use Tc-99m MAG3 or DTPA, and lung ventilation uses Xe-133 or Tc-99m DTPA aerosol.
4What is the maximum permissible annual whole-body dose for a radiation worker according to NRC regulations?
A.1 rem (10 mSv)
B.5 rem (50 mSv)
C.10 rem (100 mSv)
D.25 rem (250 mSv)
Explanation: The Nuclear Regulatory Commission (NRC) sets the maximum permissible annual whole-body dose for occupational radiation workers at 5 rem (50 mSv) total effective dose equivalent (TEDE) per 10 CFR 20.1201. The annual dose limit for individual members of the public is 0.1 rem (1 mSv) TEDE per 10 CFR 20.1301, not 1 rem. The occupational limit for individual organs (other than the lens of the eye) is 50 rem (0.5 Sv), and the lens of the eye limit is 15 rem (0.15 Sv). The ALARA principle encourages keeping exposures well below these regulatory limits.
5Before administering a radiopharmaceutical, the technologist should verify which of the following patient information?
A.Only the patient's name
B.Name and date of birth
C.Name, date of birth, and allergies only
D.Name, date of birth, pregnancy status, and relevant medication history
Explanation: Before radiopharmaceutical administration, the technologist must verify patient identity (name and date of birth), pregnancy status (especially for women of childbearing age), breastfeeding status, relevant medication history, and any allergies. This comprehensive check ensures patient safety and prevents misadministration, which is a reportable event.
6Which crystal material is used in most conventional gamma camera detectors?
A.Bismuth germanate (BGO)
B.Cadmium zinc telluride (CZT)
C.Sodium iodide doped with thallium (NaI(Tl))
D.Lutetium oxyorthosilicate (LSO)
Explanation: Sodium iodide doped with thallium (NaI(Tl)) is the standard scintillation crystal used in conventional gamma cameras (Anger cameras). It efficiently converts gamma rays into visible light photons, which are then detected by photomultiplier tubes. BGO and LSO are primarily used in PET detectors, while CZT is used in newer solid-state cardiac cameras.
7What is the half-life of Tc-99m?
A.2 hours
B.6 hours
C.12 hours
D.24 hours
Explanation: Tc-99m has a physical half-life of approximately 6 hours (6.01 hours), making it ideal for most nuclear medicine procedures. This half-life is long enough to complete imaging but short enough to limit radiation exposure to patients. Combined with its 140 keV gamma emission and availability from Mo-99/Tc-99m generators, Tc-99m remains the workhorse radionuclide in nuclear medicine.
8A patient undergoing a nuclear medicine study asks about the risk. What is the typical effective dose from a Tc-99m bone scan?
A.0.1-0.5 mSv
B.1-3 mSv
C.4-7 mSv
D.15-20 mSv
Explanation: A typical Tc-99m MDP bone scan delivers an effective dose of approximately 4-7 mSv, which is comparable to a CT scan of the abdomen. This information helps patients understand the relative risk. For comparison, natural background radiation is about 3 mSv per year, and a chest X-ray delivers approximately 0.02 mSv.
9Which organ receives the highest radiation dose from an I-131 therapy for thyroid cancer?
A.Liver
B.Bone marrow
C.Thyroid remnant tissue
D.Kidneys
Explanation: In I-131 therapy for thyroid cancer, the thyroid remnant tissue receives the highest radiation dose because iodine is actively concentrated by thyroid cells via the sodium-iodide symporter. This selective uptake is the therapeutic mechanism. While other organs receive some radiation exposure (particularly the bladder and salivary glands), the dose to thyroid tissue far exceeds doses to other organs.
10What is the purpose of a Mo-99/Tc-99m generator in nuclear medicine?
A.To produce PET radiopharmaceuticals
B.To provide a continuous on-site supply of Tc-99m
C.To dispose of radioactive waste
D.To calibrate dose calibrators
Explanation: A Mo-99/Tc-99m generator provides an on-site, continuous supply of Tc-99m through the radioactive decay of Mo-99 (half-life 66 hours) to Tc-99m. The generator is eluted daily with saline to extract Tc-99m pertechnetate, which is then used to prepare various radiopharmaceuticals. This system eliminates the need for a cyclotron or reactor at the clinical site.

About the CNMT Exam

The CNMT certification demonstrates competency in nuclear medicine technology including radiopharmaceutical preparation, nuclear imaging procedures (PET, SPECT, gamma camera), radiation safety, instrumentation quality control, and patient care for diagnostic and therapeutic nuclear medicine.

Exam sponsor: NMTCB (Nuclear Medicine Technology Certification Board). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

90 questions

Time Limit

1 hour 55 minutes

Passing Score

375 scaled score on a 200-500 scale

Exam / Certification Fees

$200

Exam sponsor website

Reported exam pass rate: 82.22%. 2025 overall pass rate; first-time program graduates passed at 89.69% This describes exam candidates, not OpenExamPrep users or results from using our resources. Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

7%

Radiation Physics and Detection

Radiation physics, radioactive decay, interactions, and detection

13%

Radiation Safety and Regulations

ALARA, dosimetry, contamination control, handling, records, and regulations

25%

Pharmaceutical and Radiopharmaceutical Agents

Preparation, quality control, generators, dose assays, agent selection, and pharmacology

15%

Instrument Operations and Quality Control

Dose calibrators, gamma cameras, SPECT, PET, hybrid imaging, acquisition, processing, artifacts, and quality control

40%

Clinical Procedures

Diagnostic and therapeutic procedures, patient preparation and care, administration, acquisition, and protocol evaluation

Preparing for the CNMT Exam

What You Need to Know

  • Passing score: 375 scaled score on a 200-500 scale
  • Exam length: 90 questions
  • Time limit: 1 hour 55 minutes
  • Exam / certification fees: $200 Official sources

Using Our Practice Resources

  • Work through all 114 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

CNMT: Suggested Study Strategy

1Focus heavily on Clinical Procedures — they make up 40% of the current COPS blueprint. Know preparation, agents, acquisition, processing, and safety for each procedure
2Master dose calculation formulas including decay calculations, concentration, and volume needed. These are commonly tested and require quick math skills
3Study NRC regulations thoroughly — dose limits, posting requirements, medical event reporting, and patient release criteria appear frequently
4Understand the physics behind gamma cameras, SPECT, and PET, including collimator types, energy windows, and image reconstruction methods
5Review quality control procedures for dose calibrators (daily, quarterly, annual tests) and gamma cameras (uniformity, linearity, sensitivity)

Frequently Asked Questions

What is the CNMT certification?

The CNMT (Certified Nuclear Medicine Technologist) certification is awarded by the NMTCB to technologists who demonstrate competency in nuclear medicine technology. It covers radiopharmaceutical preparation, nuclear imaging procedures including SPECT, PET, and gamma camera operations, radiation safety, instrumentation quality control, and patient care. The certification is required for practice in most healthcare facilities.

How many questions are on the CNMT exam?

The entry-level CNMT exam is a 90-question computer-adaptive test with a 1-hour-55-minute limit. The current passing standard is 375 on NMTCB's 200-500 scale, and unscored pretest items are included.

What are the prerequisites for the CNMT exam?

To take the CNMT exam, candidates must complete an accredited nuclear medicine technology program (JRCNMT-accredited) or meet equivalent education and clinical experience requirements. Programs are typically 1-4 years depending on the degree level (certificate, associate's, or bachelor's). Clinical competency in nuclear medicine procedures must be documented.

How should I study for the CNMT exam?

Prepare from NMTCB's current COPS outline: Radiation Physics and Detection 7%, Radiation Safety and Regulations 13%, Pharmaceutical and Radiopharmaceutical Agents 25%, Instrument Operations and Quality Control 15%, and Clinical Procedures 40%.