ARIZONA NUCLEAR MEDICINE TECHNOLOGY EXAM QUESTIONS WITH CORRECT ANSWERS AND RATIONALES LATEST UPDATE

ARIZONA NUCLEAR MEDICINE TECHNOLOGY
EXAM QUESTIONS WITH CORRECT ANSWERS
AND RATIONALES LATEST 2025-2026 UPDATE
1–10: Radiation Physics & Safety

1. What unit measures absorbed radiation dose?
A. Curie
B. Roentgen
C. Gray
D. Becquerel
Answer: C
Rationale: Gray (Gy) measures absorbed dose; 1 Gy = 1 joule/kg.

2. The half-life of Tc-99m is approximately:
A. 6 hours
B. 24 hours
C. 12 hours
D. 1 hour
Answer: A
Rationale: Tc-99m has a 6-hour physical half-life.

3. ALARA stands for:
A. As Low As Reasonably Achievable
B. Average Level of Radiation Absorption
C. Annual Limit of Radiation Activity
D. Approved Level of Radiation Activity
Answer: A

4. The primary photon interaction in diagnostic nuclear medicine
energy range is:
A. Pair production
B. Photoelectric effect
C. Compton scatter

, D. Coherent scattering
Answer: C

5. Which material is best for shielding gamma radiation?
A. Plastic
B. Lead
C. Wood
D. Aluminum
Answer: B

6. Effective half-life combines:
A. Physical and biological half-life
B. Physical and atomic mass
C. Biological and chemical half-life
D. Decay and emission rate
Answer: A

7. The unit of radioactivity is:
A. Gray
B. Sievert
C. Becquerel
D. Coulomb
Answer: C

8. The inverse square law applies to:
A. Radioactive decay
B. Radiation exposure intensity
C. Biological uptake
D. Detector efficiency
Answer: B

9. Which radiation has the highest penetration power?
A. Alpha
B. Beta
C. Gamma