CHP Health Physics Regulations and Standards 2 — Questions and Answers
Question 1: Under 10 CFR Part 20, what is the annual occupational dose limit for the lens of the eye?
- 5 rem (50 mSv)
- 15 rem (150 mSv) (Correct answer)
- 50 rem (500 mSv)
- 25 rem (250 mSv)
Correct answer: 15 rem (150 mSv)
10 CFR 20.1201 sets the occupational dose limit for the lens of the eye at 15 rem (150 mSv) per year.
Question 2: Which NRC regulation governs the licensing, installation, use, and disposal of sources of radiation under the Atomic Energy Act?
- 10 CFR Part 50
- 10 CFR Part 30 (Correct answer)
- 10 CFR Part 70
- 10 CFR Part 61
Correct answer: 10 CFR Part 30
10 CFR Part 30 regulates byproduct material, including radioactive sources used in medicine, industry, and research.
Question 3: What is the purpose of an ALARA program under NRC regulations?
- To set maximum permissible dose limits for workers
- To reduce radiation exposures to levels as low as reasonably achievable (Correct answer)
- To establish emergency action levels for reactor incidents
- To define public dose limits near nuclear power plants
Correct answer: To reduce radiation exposures to levels as low as reasonably achievable
ALARA (As Low As Reasonably Achievable) programs aim to keep radiation exposures below regulatory limits while accounting for economic and social factors.
Question 4: Under DOT regulations (49 CFR), a package with a transport index (TI) of 0.8 must be labeled as which category?
- Radioactive White-I
- Radioactive Yellow-II (Correct answer)
- Radioactive Yellow-III
- Fissile
Correct answer: Radioactive Yellow-II
Radioactive Yellow-II labels are required when the TI is greater than 0 but not more than 1, and the surface dose rate does not exceed 50 mrem/h.
Question 5: The NRC's 10 CFR Part 61 regulation primarily governs which activity?
- Transportation of radioactive materials
- Land disposal of low-level radioactive waste (Correct answer)
- Occupational dose limits for nuclear workers
- Decommissioning of nuclear facilities
Correct answer: Land disposal of low-level radioactive waste
10 CFR Part 61 establishes requirements for the land disposal of low-level radioactive waste (LLW).
Question 6: According to EPA's Federal Guidance Report No. 11, dose coefficients are used to calculate what?
- External dose from gamma-emitting point sources
- Committed effective dose per unit intake of radionuclides (Correct answer)
- Occupational exposure limits for specific isotopes
- Annual limits on intake for emergency workers
Correct answer: Committed effective dose per unit intake of radionuclides
EPA FGR-11 provides dose coefficients (mSv/Bq) for calculating committed effective dose from internal intakes of radionuclides.
Question 7: Under 10 CFR 20.1301, the total effective dose equivalent to individual members of the public from a licensed facility must not exceed:
- 500 mrem/year (5 mSv/year)
- 100 mrem/year (1 mSv/year) (Correct answer)
- 25 mrem/year (0.25 mSv/year)
- 50 mrem/year (0.5 mSv/year)
Correct answer: 100 mrem/year (1 mSv/year)
10 CFR 20.1301 limits the dose to members of the public to 100 mrem (1 mSv) per year from licensed operations.
CHP Health Physics Regulations and Standards 2
Under 10 CFR Part 20, what is the annual occupational dose limit for the lens of the eye?