NRRPT Dosimetry and Exposure Control 5

Question 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:

Accepted Answer

0.5 rem (500 mrem) total

Answer

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.

Question 2

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

Accepted Answer

16 DAC-hours

Answer

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

Question 3

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

Accepted Answer

Aluminum oxide (Al2O3:C)

Answer

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

Question 4

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

Accepted Answer

50 rem/year

Answer

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

Question 5

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

Accepted Answer

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

Answer

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

(NRRPT) National Registry of Radiation Protection Technicians Practice Test

(NRRPT) National Registry of Radiation Protection Technicians Practice Test

NRRPT Dosimetry and Exposure Control 5