Practice Test Geeks(NRRPT) National Registry of Radiation Protection Technicians Practice Test
← All NRRPT Flashcard Decks

Dosimetry and Exposure Control Flashcards

7 cards from real NRRPT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Dosimetry and Exposure Control flashcards as text

  1. A radiation worker is classified as a declared pregnant worker. The NRC dose limit to the embryo/fetus for the entire gestation period is:

    Answer: 0.5 rem (500 mrem) total

    10 CFR 20.1208 limits the dose to the embryo/fetus of a declared pregnant worker to 0.5 rem (5 mSv) over the entire gestation period.

  2. When using the DAC-hour concept for internal dosimetry, a worker who spends 8 hours in an area at 2 DAC accumulates:

    Answer: 16 DAC-hours

    DAC-hours = DAC multiplier × hours of exposure = 2 DAC × 8 hours = 16 DAC-hours.

  3. Optically Stimulated Luminescence (OSL) dosimeters use which material as the detection medium?

    Answer: Aluminum oxide (Al2O3:C)

    OSL dosimeters use carbon-doped aluminum oxide (Al2O3:C) crystals that store radiation energy and release it as light when stimulated by laser.

  4. The occupational dose limit for the skin and extremities under 10 CFR 20 is:

    Answer: 50 rem/year

    10 CFR 20.1201 sets the annual occupational dose limit for the skin and extremities at 50 rem (500 mSv) per year.

  5. Which of the following is a limitation of film badge dosimeters compared to TLDs?

    Answer: Film badges fade over time and are affected by heat and humidity

    Film badges can fade (lose recorded dose information) when exposed to heat, humidity, or over extended time periods, reducing accuracy for long-wear periods.

  6. A licensee's bioassay program detects tritium (H-3) in a worker's urine at 40,000 dpm/mL. The first required action is to:

    Answer: Estimate the intake and calculate the committed effective dose equivalent

    When bioassay detects internal contamination, the first step is to estimate the intake using appropriate metabolic models and calculate the resulting CEDE to determine if regulatory limits were exceeded.

  7. What does the H*(10) quantity represent in radiation protection dosimetry?

    Answer: The ambient dose equivalent at 10 mm depth in the ICRU sphere, used for area monitoring

    H*(10) is the ambient dose equivalent at a depth of 10 mm in the ICRU sphere, a quantity used in area monitoring instruments to approximate effective dose for penetrating radiation.