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

A whole-body counter uses large-volume gamma detectors positioned around the body to detect and quantify internally deposited gamma-emitting radionuclides in organs and tissues.

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

Upon receiving an elevated dosimeter report, the RSO should investigate its cause (actual exposure vs. dosimeter error), verify the dose assignment, and determine if administrative controls or corrective actions are needed.

Question 3

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

Accepted Answer

Bq/L or µg/L (mass concentration)

Answer

Uranium urine bioassay is reported as activity per liter (Bq/L) or as mass concentration (µg/L), since natural uranium's chemical toxicity is also a concern alongside radiological dose.

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

The ALI is the amount of a radionuclide that, if inhaled or ingested, would deliver a committed effective dose equal to the annual occupational limit of 50 mSv (5 rem).

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

A nasal swipe quickly screens for the presence of radioactive material in the nasal passages, indicating potential inhalation, though it does not quantify the committed dose.

RSO - Radiation Safety Officer Practice Test

RSO - Radiation Safety Officer Practice Test

RSO Dosimetry and Personal Exposure Assessment 3