Nuclear Medicine Technology Certification Board (NMTCB)
Exam Prep |Questions, Answers & Explanations |Radio
pharmaceutics, Radiation Safety, SPECT Imaging – 2026/2027
(Radiology Course)
Question 1
The primary purpose of nuclear medicine is to:
A. Diagnose and treat diseases using radioactive materials
B. Replace all surgical procedures
C. Produce only anatomical images
D. Eliminate the need for laboratory testing
Correct Answer: A. Diagnose and treat diseases using radioactive
materials
Explanation:
Nuclear medicine uses radioactive pharmaceuticals (radiopharmaceuticals) to
evaluate physiological function, diagnose disease, and provide targeted
therapies. Unlike conventional imaging, nuclear medicine primarily
demonstrates functional and metabolic processes.
Question 2
A radiopharmaceutical consists of:
A. A radioactive isotope combined with a pharmaceutical compound
B. Only a radioactive isotope
C. Only a contrast agent
D. A magnetic field and radio waves
Correct Answer: A. A radioactive isotope combined with a
pharmaceutical compound
Explanation:
Radiopharmaceuticals contain a radionuclide attached to a biologically active
1
,molecule. The pharmaceutical component determines where the tracer
accumulates, while the radionuclide emits radiation for detection or
treatment.
Question 3
The most commonly used radionuclide in diagnostic nuclear medicine is:
A. Technetium-99m
B. Iodine-131
C. Cobalt-60
D. Cesium-137
Correct Answer: A. Technetium-99m
Explanation:
Technetium-99m is widely used because it has a short physical half-life, emits
ideal gamma energy (140 keV), and can be attached to many different
pharmaceuticals.
Question 4
The physical half-life of Technetium-99m is approximately:
A. 6 hours
B. 24 hours
C. 8 days
D. 30 years
Correct Answer: A. 6 hours
Explanation:
Technetium-99m has a physical half-life of approximately 6 hours, allowing
effective imaging while minimizing radiation exposure to patients.
Question 5
2
,The instrument used to measure radioactivity of a radiopharmaceutical dose
is:
A. Dose calibrator
B. Geiger counter
C. Gamma camera
D. Ultrasound transducer
Correct Answer: A. Dose calibrator
Explanation:
A dose calibrator measures the activity of radioactive materials before
administration to ensure the correct patient dose is prepared.
Question 6
The primary function of a gamma camera is to:
A. Detect gamma photons emitted from radiopharmaceuticals
B. Produce ultrasound images
C. Generate magnetic fields
D. Measure blood pressure
Correct Answer: A. Detect gamma photons emitted from
radiopharmaceuticals
Explanation:
Gamma cameras detect emitted gamma radiation and convert it into images
showing the distribution of radiopharmaceuticals within the body.
Question 7
The collimator of a gamma camera:
A. Determines the direction of incoming gamma photons
B. Produces radioactive material
3
, C. Amplifies patient radiation dose
D. Creates magnetic fields
Correct Answer: A. Determines the direction of incoming gamma
photons
Explanation:
The collimator contains lead channels that allow only photons traveling in
specific directions to reach the detector, improving image localization.
Question 8
The scintillation crystal in a gamma camera:
A. Converts gamma photons into visible light
B. Produces electrical stimulation
C. Blocks all radiation
D. Creates ultrasound waves
Correct Answer: A. Converts gamma photons into visible light
Explanation:
The sodium iodide crystal absorbs gamma photons and produces flashes of
light, which are converted into electrical signals for image formation.
Question 9
The photomultiplier tube (PMT) in a gamma camera:
A. Converts light signals into electrical signals and amplifies them
B. Produces radioactive isotopes
C. Measures patient temperature
D. Blocks gamma radiation
Correct Answer: A. Converts light signals into electrical signals and
amplifies them
4
Exam Prep |Questions, Answers & Explanations |Radio
pharmaceutics, Radiation Safety, SPECT Imaging – 2026/2027
(Radiology Course)
Question 1
The primary purpose of nuclear medicine is to:
A. Diagnose and treat diseases using radioactive materials
B. Replace all surgical procedures
C. Produce only anatomical images
D. Eliminate the need for laboratory testing
Correct Answer: A. Diagnose and treat diseases using radioactive
materials
Explanation:
Nuclear medicine uses radioactive pharmaceuticals (radiopharmaceuticals) to
evaluate physiological function, diagnose disease, and provide targeted
therapies. Unlike conventional imaging, nuclear medicine primarily
demonstrates functional and metabolic processes.
Question 2
A radiopharmaceutical consists of:
A. A radioactive isotope combined with a pharmaceutical compound
B. Only a radioactive isotope
C. Only a contrast agent
D. A magnetic field and radio waves
Correct Answer: A. A radioactive isotope combined with a
pharmaceutical compound
Explanation:
Radiopharmaceuticals contain a radionuclide attached to a biologically active
1
,molecule. The pharmaceutical component determines where the tracer
accumulates, while the radionuclide emits radiation for detection or
treatment.
Question 3
The most commonly used radionuclide in diagnostic nuclear medicine is:
A. Technetium-99m
B. Iodine-131
C. Cobalt-60
D. Cesium-137
Correct Answer: A. Technetium-99m
Explanation:
Technetium-99m is widely used because it has a short physical half-life, emits
ideal gamma energy (140 keV), and can be attached to many different
pharmaceuticals.
Question 4
The physical half-life of Technetium-99m is approximately:
A. 6 hours
B. 24 hours
C. 8 days
D. 30 years
Correct Answer: A. 6 hours
Explanation:
Technetium-99m has a physical half-life of approximately 6 hours, allowing
effective imaging while minimizing radiation exposure to patients.
Question 5
2
,The instrument used to measure radioactivity of a radiopharmaceutical dose
is:
A. Dose calibrator
B. Geiger counter
C. Gamma camera
D. Ultrasound transducer
Correct Answer: A. Dose calibrator
Explanation:
A dose calibrator measures the activity of radioactive materials before
administration to ensure the correct patient dose is prepared.
Question 6
The primary function of a gamma camera is to:
A. Detect gamma photons emitted from radiopharmaceuticals
B. Produce ultrasound images
C. Generate magnetic fields
D. Measure blood pressure
Correct Answer: A. Detect gamma photons emitted from
radiopharmaceuticals
Explanation:
Gamma cameras detect emitted gamma radiation and convert it into images
showing the distribution of radiopharmaceuticals within the body.
Question 7
The collimator of a gamma camera:
A. Determines the direction of incoming gamma photons
B. Produces radioactive material
3
, C. Amplifies patient radiation dose
D. Creates magnetic fields
Correct Answer: A. Determines the direction of incoming gamma
photons
Explanation:
The collimator contains lead channels that allow only photons traveling in
specific directions to reach the detector, improving image localization.
Question 8
The scintillation crystal in a gamma camera:
A. Converts gamma photons into visible light
B. Produces electrical stimulation
C. Blocks all radiation
D. Creates ultrasound waves
Correct Answer: A. Converts gamma photons into visible light
Explanation:
The sodium iodide crystal absorbs gamma photons and produces flashes of
light, which are converted into electrical signals for image formation.
Question 9
The photomultiplier tube (PMT) in a gamma camera:
A. Converts light signals into electrical signals and amplifies them
B. Produces radioactive isotopes
C. Measures patient temperature
D. Blocks gamma radiation
Correct Answer: A. Converts light signals into electrical signals and
amplifies them
4
