NMTCB Cheat Sheet 2026

The 30 highest-yield NMTCB facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which property makes technetium-99m particularly ideal for nuclear medicine imaging? → 140 keV gamma emission with 6-hour half-life and no particulate radiation
2. Which parameter determines whether a proportional counter or ionization chamber region is being used? → The applied voltage, which controls the degree of gas multiplication (Townsend avalanche)
3. For a counting system, the minimum detectable activity (MDA) is primarily determined by: → Background count rate, detector efficiency, and counting time
4. Which PET radiopharmaceutical is used to assess myocardial viability by evaluating fatty acid metabolism? → C-11 palmitate
5. In a V/Q lung scan, the lingula is a segment of which lobe and appears in which imaging projection? → Left upper lobe, best seen on left lateral view
6. In bone scintigraphy, the epiphyseal growth plates in pediatric patients show increased tracer uptake because of which physiological process? → Active osteoblastic remodeling and increased blood flow in the physis
7. Which radiopharmaceutical is used to image somatostatin receptor-positive neuroendocrine tumors (NETs)? → Ga-68 DOTATATE
8. Which agency regulates the transportation of radioactive materials by highway in the United States? → Department of Transportation (DOT)
9. Which interaction mechanism is primarily responsible for photoelectric absorption in diagnostic nuclear medicine energy ranges? → Ejection of an inner-shell electron by a photon that is completely absorbed
10. Fluorescence yield (ω) in X-ray emission describes the probability that a vacancy in an electron shell will result in: → Characteristic X-ray emission rather than Auger electron emission
11. When documenting assessment findings in NMTCB practice, which approach is MOST appropriate? → Record objective findings, measurements, and professional observations factually
12. What is the NRC-mandated lens of the eye annual dose equivalent limit for occupational workers? → 15 rem (150 mSv)
13. The Bateman equations describe: → Buildup and decay kinetics of daughter nuclides in a radioactive decay chain
14. What is the function of shielding in radiation protection? → To focus and direct the radiation beam
15. How are radiopharmaceuticals administered to patients? → By intravenous injection, oral ingestion, or inhalation
16. What is the annual occupational effective dose limit for radiation workers in the US? → 5 rem (50 mSv)
17. How frequently should ongoing assessments be conducted in Nuclear Medicine Technology Certification Board practice? → At regular intervals based on established protocols and as conditions change
18. When conducting a risk assessment for NMTCB operations, which factor should receive the HIGHEST priority? → Probability and severity of potential harm
19. Which quality control test for a well counter verifies that the system gives consistent counts for the same source activity on different days? → Reproducibility (precision) test
20. When a NMTCB professional encounters an unexpected result during a technical procedure, the FIRST action should be to: → Stop, assess the situation, and determine whether to proceed or seek guidance
21. In hepatobiliary imaging, which sphincter controls bile flow from the common bile duct into the duodenum? → Sphincter of Oddi
22. What is the role of collimators in radiation detection? → To focus and direct the radiation beam
23. Which radiopharmaceutical requires thyroid blocking prior to administration to prevent thyroidal uptake? → I-123 MIBG
24. In a sentinel lymph node mapping procedure for breast cancer, the primary lymph node basin targeted is located in which anatomical region? → Axilla
25. What is the purpose of calibration in nuclear medicine instrumentation? → To ensure accurate measurements and consistency
26. How does radiation monitoring support safety protocols? → By tracking exposure to ensure compliance and safety
27. Which detector type is used in PET scanners primarily because of its: → Ability to detect coincident 511 keV annihilation photons with high stopping power
28. Which statement about In-111 pentetreotide (OctreoScan) is correct? → It is a somatostatin analogue that images neuroendocrine tumors expressing SSTR
29. What is the accepted frequency for performing accuracy (accuracy/constancy) testing of a dose calibrator according to NRC/AAPM recommendations? → Daily
30. Internal conversion coefficient (α) is defined as the ratio of: → Internal conversion electron emission rate to gamma ray emission rate