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Free NMTCB Practice Questions

10 free, exam-style Nuclear Medicine Technologist Certification (NMTCB) practice questions with answers and explanations. No signup required. Work through them below, then take the full free NMTCB practice test to study every exam domain.

Question 1

A radiopharmacy receives a Tc-99m vial containing 100 mCi at 6:00 AM. Assuming a physical half-life of 6 hours, how much activity remains in the vial at 6:00 PM the same day?

  1. 25 mCi
  2. 50 mCi
  3. 12.5 mCi
  4. 75 mCi
Show answer & explanation

Correct answer: A - 25 mCi

Question 2

What is the annual occupational whole-body dose limit (total effective dose equivalent) for a radiation worker under NRC regulations (10 CFR 20.1201)?

  1. 0.5 rem (5 mSv) per year
  2. 15 rem (150 mSv) per year
  3. 50 rem (500 mSv) per year
  4. 5 rem (50 mSv) per year
Show answer & explanation

Correct answer: D - 5 rem (50 mSv) per year

Question 3

A technologist measures an exposure rate of 80 mR/hr at a distance of 1 meter from a source. Using the inverse square law, what is the approximate exposure rate at 2 meters?

  1. 40 mR/hr
  2. 20 mR/hr
  3. 10 mR/hr
  4. 160 mR/hr
Show answer & explanation

Correct answer: B - 20 mR/hr

Question 4

Before administration, each Tc-99m generator eluate must be tested for molybdenum breakthrough. According to USP/NRC standards, the maximum permissible amount of Mo-99 at the time of administration is:

  1. 15 microcuries of Mo-99 per millicurie of Tc-99m
  2. 10 micrograms of Mo-99 per milliliter of generator eluate
  3. 0.15 microcurie of Mo-99 per millicurie of Tc-99m
  4. 0.15 microcurie of Mo-99 per milliliter of generator eluate
Show answer & explanation

Correct answer: C - 0.15 microcurie of Mo-99 per millicurie of Tc-99m

Question 5

Tc-99m MAG3 is widely used for renal imaging. The kidneys clear this radiopharmaceutical primarily by which mechanism?

  1. Tubular secretion
  2. Glomerular filtration
  3. Cortical binding
  4. Capillary blockade
Show answer & explanation

Correct answer: A - Tubular secretion

Question 6

Which of the following dose calibrator quality control tests is required to be performed each day before patient use?

  1. Accuracy
  2. Linearity
  3. Geometry
  4. Constancy
Show answer & explanation

Correct answer: D - Constancy

Question 7

A technologist is preparing to image a patient who received I-131, which has a principal photon energy of 364 keV. Which collimator is MOST appropriate?

  1. Low-energy all-purpose (LEAP)
  2. High-energy
  3. Medium-energy
  4. Low-energy high-resolution (LEHR)
Show answer & explanation

Correct answer: B - High-energy

Question 8

On a Tc-99m mebrofenin hepatobiliary study, the liver and small bowel are visualized normally, but the gallbladder is not seen at 60 minutes or after morphine administration. This finding is MOST consistent with:

  1. Chronic cholecystitis
  2. Common bile duct obstruction
  3. Acute cholecystitis
  4. A normal hepatobiliary study
Show answer & explanation

Correct answer: C - Acute cholecystitis

Question 9

When preparing a Tc-99m MAA lung perfusion study, the number of administered particles should be REDUCED in a patient with a known:

  1. Right-to-left cardiac shunt
  2. Recent pulmonary embolism
  3. Left-to-right cardiac shunt
  4. History of chronic obstructive pulmonary disease
Show answer & explanation

Correct answer: A - Right-to-left cardiac shunt

Question 10

During a regadenoson (Lexiscan) pharmacologic stress study, a patient develops severe bronchospasm and chest tightness. Which medication is used to REVERSE these effects?

  1. Atropine
  2. Nitroglycerin
  3. Metoprolol
  4. Aminophylline
Show answer & explanation

Correct answer: D - Aminophylline

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