Licensing Examination Practice

Illinois Nuclear Medicine Technologist Licensing Examination Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the half-life of Technetium-99m (Tc-99m)?
• 6 hours
• 12 hours
• 24 hours
• 48 hours
• 6 hours

Rationale: Tc-99m has a physical half-life of 6 hours, which makes it ideal

for diagnostic imaging due to its short duration and minimal radiation dose. 1 / 4

• Which of the following is the primary mode of decay for Iodine-131?
• Beta decay
• Alpha decay
• Gamma decay
• Electron capture
• Beta decay

Rationale: Iodine-131 decays primarily by beta emission, accompanied by

gamma photons suitable for imaging and therapy.

3. The most common indication for a myocardial perfusion scan is:

• Pulmonary embolism
• Coronary artery disease
• Thyroid function assessment
• Bone metastases
• Coronary artery disease

Rationale: Myocardial perfusion imaging evaluates blood flow to the heart

muscle, commonly to detect ischemia or coronary artery disease.

• Which collimator is typically used for Tc-99m bone scans?
• Low-energy high-resolution (LEHR)
• Medium-energy general-purpose (MEGP)
• High-energy general-purpose (HEGP)
• Low-energy general-purpose (LEGP) 2 / 4

• Low-energy high-resolution (LEHR)

Rationale: LEHR collimators provide high spatial resolution for imaging

low-energy gamma emitters like Tc-99m.

5. The unit of absorbed dose in the SI system is:

• Rad
• Gray
• Rem
• Sievert
• Gray

Rationale: The gray (Gy) is the SI unit of absorbed dose, where 1 Gy = 1

joule/kg of tissue.

6. The purpose of a flood source in gamma camera quality control is to:

• Assess energy resolution
• Evaluate uniformity
• Check spatial resolution
• Measure sensitivity
• Evaluate uniformity

Rationale: Flood source images allow assessment of detector uniformity

and identification of nonuniformities in the gamma camera.

7. The effective dose considers:

• Only the energy absorbed
• Radiation type and tissue sensitivity 3 / 4

• Time of exposure
• Activity administered
• Radiation type and tissue sensitivity

Rationale: Effective dose accounts for both the absorbed dose and the

biological impact based on tissue radiosensitivity and radiation type.

• Which of the following radiopharmaceuticals is commonly used for

thyroid imaging?

• Tc-99m MDP
• I-123 Sodium Iodide

C. F-18 FDG

• Ga-67 Citrate
• I-123 Sodium Iodide

Rationale: I-123 is taken up by thyroid tissue and emits gamma photons

ideal for diagnostic thyroid scans.

9. The primary purpose of performing a renogram is to assess:

• Bone metabolism
• Kidney function
• Liver function
• Myocardial perfusion
• Kidney function

Rationale: A renogram evaluates renal perfusion, function, and drainage

using radiopharmaceuticals like Tc-99m MAG3.

• / 4