NRRPT Dosimetry and Exposure Control 2

Question 1

A radiation worker receives 150 mrem from external exposure and 50 mrem from internal deposition in a calendar quarter. What is the total effective dose equivalent for that quarter?

Accepted Answer

200 mrem

Answer

150 mrem

Answer

50 mrem

Answer

100 mrem

Question 2

Which dosimeter type uses lithium fluoride (LiF) crystals to measure accumulated radiation dose?

Accepted Answer

Thermoluminescent dosimeter (TLD)

Answer

Film badge

Answer

Optically stimulated luminescence (OSL)

Answer

Pocket ionization chamber

Question 3

Under NRC regulations, the annual occupational dose limit for the lens of the eye is:

Accepted Answer

15 rem

Answer

5 rem

Answer

50 rem

Answer

25 rem

Question 4

What principle requires radiation protection programs to keep doses as low as reasonably achievable, considering economic and social factors?

Accepted Answer

ALARA

Answer

TEDE

Answer

CEDE

Answer

ICRP

Question 5

A direct-reading pocket dosimeter reads 0 mR at the start of a shift and 340 mR at the end. If the worker's legal dose limit is 1250 mR/quarter, what percentage of the quarterly limit was used?

Accepted Answer

27.2%

Answer

13.6%

Answer

34.0%

Answer

68.0%

Question 6

Which of the following best describes the committed effective dose equivalent (CEDE)?

Accepted Answer

Dose from internal radionuclides integrated over 50 years following intake

Answer

Dose from external sources only over a 50-year period

Answer

Annual whole-body dose from all sources

Answer

Deep dose equivalent from penetrating radiation

Question 7

When bioassay results indicate a worker may have exceeded 10% of the Annual Limit on Intake (ALI), what action is required under 10 CFR 20?

Accepted Answer

Investigate and assess the intake

Answer

No action needed unless 50% ALI is exceeded

Answer

Immediately remove the worker from all radiation areas

Answer

Notify the NRC within 4 hours