RSO Dosimetry and Personal Exposure Assessment

Question 1

A thermoluminescent dosimeter (TLD) measures radiation exposure by:

Accepted Answer

Storing energy in crystal lattice defects released as light when heated

Answer

TLDs work by trapping radiation-induced electrons in crystal lattice defects; when heated, trapped electrons release their stored energy as measurable light proportional to dose.

Question 2

The NRC annual occupational whole-body dose limit (TEDE) for radiation workers is:

Accepted Answer

50 mSv (5 rem)

Answer

10 CFR 20.1201 establishes the annual occupational total effective dose equivalent (TEDE) limit at 50 mSv (5 rem) for adults working with radiation.

Question 3

An optically stimulated luminescence (OSL) dosimeter differs from a TLD primarily because it:

Accepted Answer

Releases stored dose information using light rather than heat

Answer

OSL dosimeters use laser light rather than heat to stimulate the release of trapped electrons, which then emit light proportional to the accumulated dose.

Question 4

When should a radiation worker wear their dosimeter at the collar level rather than at the waist?

Accepted Answer

When wearing a lead apron in fluoroscopy or other high-dose-rate x-ray environments

Answer

During fluoroscopy with a lead apron, a collar badge worn outside the apron monitors the unshielded head and neck dose; a second badge under the apron may estimate effective dose.

Question 5

A deep dose equivalent (DDE) reported on a dosimeter badge refers to dose at a tissue depth of:

Accepted Answer

1.0 cm for deep tissue/organs

Answer

Deep dose equivalent is the dose equivalent at 1 cm depth in tissue, representing dose to deep organs and used in calculating TEDE for external radiation.

RSO - Radiation Safety Officer Practice Test

RSO - Radiation Safety Officer Practice Test

RSO Dosimetry and Personal Exposure Assessment