RSO Dosimetry and Personal Exposure Assessment 3

Question 1

A whole-body counter is used to measure:

Accepted Answer

Internally deposited gamma-emitting radionuclides

Answer

External gamma dose accumulated over time

Answer

Neutron activation products in the body

Answer

Beta skin contamination on the torso

Question 2

An RSO receives a dosimeter report showing a worker accumulated 4,200 mrem DDE in one quarter. The RSO's first action should be to:

Accepted Answer

Investigate the cause, verify the dose was correctly assigned, and evaluate whether any corrective actions are needed

Answer

Immediately terminate the worker's radiation work authorization

Answer

File a Form NRC-4 with the NRC within 24 hours

Answer

Require the worker to take a 3-month leave of absence

Question 3

For uranium workers, urine bioassay results are typically expressed in units of:

Accepted Answer

Bq/L or µg/L (mass concentration)

Answer

Counts per minute (CPM) only

Answer

rem/year committed dose

Answer

nSv/h ambient dose equivalent

Question 4

The Annual Limit on Intake (ALI) for a radionuclide is defined as the intake that would result in a committed effective dose of:

Accepted Answer

50 mSv (5 rem)

Answer

1 mSv

Answer

5 mSv

Answer

100 mSv

Question 5

A nasal swipe collected shortly after a potential inhalation event is used to:

Accepted Answer

Provide a rapid qualitative screening indicator of potential internal contamination

Answer

Measure the committed effective dose precisely

Answer

Determine the AMAD of the inhaled aerosol

Answer

Replace lung counting for all radionuclides

Question 6

Personnel dosimetry records must be maintained by NRC licensees for how long?

Accepted Answer

For the duration of employment plus 3 years post-termination, or until age 75 (whichever is later)

Answer

5 years

Answer

10 years

Answer

Until the worker's death or for 3 years after leaving the organization