NRRPT Cheat Sheet 2026

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

1. Which regulatory framework governs the disposal of uranium mill tailings in the United States? → 10 CFR Part 40 Appendix A and the Uranium Mill Tailings Radiation Control Act (UMTRCA)
2. How long should radiation exposure records be retained? → Lifetime of employment + 30 years
3. How can internal contamination be prevented? → Use respiratory protection and gloves
4. What is the significance of the ICRP publication 66 Human Respiratory Tract Model for internal dosimetry? → It describes particle deposition and clearance in each respiratory region
5. What is required before using any new medical equipment? → Acceptance testing
6. What is the NRC annual dose limit for members of the public from licensed operations? → 100 mrem
7. Why is detection of radiation important? → Prevent overexposure
8. Under 10 CFR Part 61, which LLW class has the most stringent disposal requirements and longest required isolation period? → Class C
9. In which energy range is Compton scattering the dominant interaction mechanism for photons in soft tissue? → 100 keV to 10 MeV
10. Which method is typically used for skin decontamination? → Soap and water wash
11. What does a scintillation detector use to detect radiation? → Light pulses
12. Which NRC regulation establishes the annual occupational dose limit for the whole body? → 10 CFR Part 20
13. Which Department of Transportation (DOT) regulation primarily governs the transportation of radioactive materials? → 49 CFR Part 173 Subpart I
14. Which PPE is essential for handling radioactive materials? → Protective gloves and clothing
15. The 'decay-in-storage' method is most applicable for radioactive waste containing isotopes with: → Half-lives less than 90 days
16. Which of the following describes the primary function of a High-Efficiency Particulate Air (HEPA) filter used in nuclear ventilation systems? → To remove at least 99.97% of airborne particles with a size of 0.3 micrometers.
17. What is the purpose of a dosimetry report? → Track radiation dose history
18. What does a Geiger-Müller counter detect? → Ionizing radiation
19. Which radiation has the highest penetrating power? → Gamma rays
20. What is the best method to reduce external radiation exposure? → Maximize distance and shielding
21. What is the recommended shielding strategy for beta emitters to minimize bremsstrahlung? → Use plastic or aluminum first, then lead if needed
22. Which facility is specifically designed for the disposal of transuranic (TRU) waste from US defense activities? → Waste Isolation Pilot Plant (WIPP)
23. A technician needs to measure the dose from a low-energy beta source on the skin. Which type of detector would be most appropriate for this scenario? → A pancake-style Geiger-Mueller probe with a thin window
24. Which of the following describes the 'intrinsic efficiency' of a radiation detector? → The ratio of pulses produced to the number of particles striking the detector.
25. Which of the following best describes a 'Contact-Handled' (CH) TRU waste package versus a 'Remote-Handled' (RH) TRU waste package? → CH-TRU has surface dose rates ≤200 mrem/hr; RH-TRU has surface dose rates >200 mrem/hr
26. What organization sets safety standards for healthcare facilities in the U.S.? → The Joint Commission
27. What does the term 'dose conversion factor' (DCF) represent in internal dosimetry? → The committed effective dose per unit activity intake (Sv/Bq or rem/µCi)
28. Why are foot and hand monitors used? → To detect contamination on extremities
29. What is the purpose of lockout/tagout procedures? → Prevent accidental startup
30. Why is electrical safety critical in medical equipment? → To avoid electric shocks